Kinh nghiệm lập trình Android

Bài 17- log cat indandroid

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<span style="font-size: large;">Blog chia sẻ kinh nghiệm lập trình Android</span><br />
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<span style="font-size: large;">Chào các bạn hôm nay mình sẽ hướng dẫn các bạn làm thế nào đề xuất ra một thông báo ẩn dạng logcat cho người lập trình biết đoạn code nó hoạt động như thế nào. giống như System.out.printf(" thông báo");</span><br />
<span style="font-size: large;">ảnh minh họa :</span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiicNjNcoNLKqZxFbUATcY5N1UwUnqQ1zSO8UVZATqTHYmybvGuVZKP9MaArTrOlKFhRySH2-lThPYynVhYp_ot6XKCT6iHUnRKOZ1ae5InfBpjnkipH87A44lJJ7h-OCVR-6ss97BPRwU/s1600/Capture.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-size: large;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiicNjNcoNLKqZxFbUATcY5N1UwUnqQ1zSO8UVZATqTHYmybvGuVZKP9MaArTrOlKFhRySH2-lThPYynVhYp_ot6XKCT6iHUnRKOZ1ae5InfBpjnkipH87A44lJJ7h-OCVR-6ss97BPRwU/s1600/Capture.PNG" /></span></a></div>
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<span style="font-size: large;">sau khi bấn nút tính thì sẽ hiện lên thông báo trên phần output. phần này thông báo cho người lập trình biết , người dùng ứng dụng không hề biết.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjttU7P6FRbnqEiAwx8oFCtMrSqYdGBZ3UrooIxCSTb-eycWtsyac-Y5pkdV9V0vhhTp2XWg9bvUmqqMqprLkWXUGaxg2mkv2Ad8P8QaLH_VNrmfhH47E2wrLj9ODU8qvLNTNXECntkLvg/s1600/Capture1.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-size: large;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjttU7P6FRbnqEiAwx8oFCtMrSqYdGBZ3UrooIxCSTb-eycWtsyac-Y5pkdV9V0vhhTp2XWg9bvUmqqMqprLkWXUGaxg2mkv2Ad8P8QaLH_VNrmfhH47E2wrLj9ODU8qvLNTNXECntkLvg/s1600/Capture1.PNG" /></span></a></div>
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<span style="font-size: large;">vậy trong android làm thế nào để bạn có thể làm được điều đó, hôm nay mình sẽ hướng dẫn cho các bạn biết.</span></div>
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<span style="font-size: large;"> Đầu tiên tạo 1 project sau đó thêm cho mình một button "OK" vào để hiển thị thông báo khi click.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhE8Lz-o0qzisge2hpMer4cbRE2ybUNRz3nxXFp7gfhrFmxc2ulmZgMaZJCoHC6NXmITQzaWHWlR_X-iBhz6teCyDMpsrJm7QCCoYZVxC5vePH0D943hEHHcUHCTT4C0utOtnc-AodBzlA/s1600/Capture.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-size: large;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhE8Lz-o0qzisge2hpMer4cbRE2ybUNRz3nxXFp7gfhrFmxc2ulmZgMaZJCoHC6NXmITQzaWHWlR_X-iBhz6teCyDMpsrJm7QCCoYZVxC5vePH0D943hEHHcUHCTT4C0utOtnc-AodBzlA/s1600/Capture.PNG" /></span></a></div>
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<span style="font-size: large;">Bạn sang main.class thực hiện như sau : </span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiQMnUx9CyMPAkq8SjPEpNSt9fAd0u0P2Q7RTJsNy0JC4ghgagFr-uE5fD_Cr1iCBfS568ybEpeo6tCf1_LtEMXghwBwbOpnFWsap7iTXoBe8SYs_S740brQBSkU_bJqDvUXWYPtvKAHlc/s1600/Capture1.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-size: large;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiQMnUx9CyMPAkq8SjPEpNSt9fAd0u0P2Q7RTJsNy0JC4ghgagFr-uE5fD_Cr1iCBfS568ybEpeo6tCf1_LtEMXghwBwbOpnFWsap7iTXoBe8SYs_S740brQBSkU_bJqDvUXWYPtvKAHlc/s1600/Capture1.PNG" /></span></a></div>
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<span style="font-size: large;"><b>import log từ<span style="color: red;"> import android.util.Log;</span></b></span></div>
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<span style="font-size: large;">Bây giờ bạn chạy ứng dụng và click nút OK.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjLE0BoEutATx23UXS_dQ_rpHGWJRYsZN8FtWY16dchCOIqBKujf4qlk3JuQM_SpRvvHE6_Hmb9A5XMpql4nJpOGx6k-X8Gt8eELCT1oh8o8PHKmvLn54-LMdczs96rv0KfzPXWMW1nC_0/s1600/Capture.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-size: large;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjLE0BoEutATx23UXS_dQ_rpHGWJRYsZN8FtWY16dchCOIqBKujf4qlk3JuQM_SpRvvHE6_Hmb9A5XMpql4nJpOGx6k-X8Gt8eELCT1oh8o8PHKmvLn54-LMdczs96rv0KfzPXWMW1nC_0/s1600/Capture.PNG" /></span></a></div>
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<span style="font-size: large;">Phần thông báo sẽ xuất hiện.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhFl-9XyW7T1UFzO1lguIIsPGmemim-1jR_nI_WU78rxsC05iswbSMA9yAkTS1qD9c35o7eL_iKW585nnngygCBTCzo1DoLyosiwsI0OGbZ359HMynASgsWWbQdFFaeHzuzfRj431Touec/s1600/Capture1.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-size: large;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhFl-9XyW7T1UFzO1lguIIsPGmemim-1jR_nI_WU78rxsC05iswbSMA9yAkTS1qD9c35o7eL_iKW585nnngygCBTCzo1DoLyosiwsI0OGbZ359HMynASgsWWbQdFFaeHzuzfRj431Touec/s1600/Capture1.PNG" /></span></a></div>
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<span style="font-size: large;">Đây là cách kiểm tra các thông số mà chúng ta không muốn hiển thị lên màn hình hoặc bất kì điều gì bạn muốn , cũng khá đơn giản.</span></div>
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<span style="font-size: large;">Chúc các bạn thành công.</span></div>
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<span style="font-size: large;">full code xml</span></div>
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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"</div>
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    xmlns:tools="http://schemas.android.com/tools"</div>
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    android:layout_width="match_parent"</div>
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    android:layout_height="match_parent"</div>
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    android:paddingBottom="@dimen/activity_vertical_margin"</div>
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    android:paddingLeft="@dimen/activity_horizontal_margin"</div>
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    android:paddingRight="@dimen/activity_horizontal_margin"</div>
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    android:paddingTop="@dimen/activity_vertical_margin"</div>
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    tools:context=".MainActivity" ></div>
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    <TextView</div>
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        android:id="@+id/textView1"</div>
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        android:layout_width="wrap_content"</div>
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        android:layout_height="wrap_content"</div>
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        android:text="@string/hello_world" /></div>
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    <Button</div>
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        android:id="@+id/button1"</div>
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        android:layout_width="wrap_content"</div>
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        android:layout_height="wrap_content"</div>
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        android:layout_below="@+id/textView1"</div>
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        android:layout_marginLeft="15dp"</div>
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        android:layout_marginTop="90dp"</div>
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        android:layout_toRightOf="@+id/textView1"</div>
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        android:text="ok" /></div>
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</RelativeLayout></div>
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<span style="font-size: large;">fullcode java</span></div>
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package com.example.show_logv;</div>
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import android.app.Activity;</div>
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import android.os.Bundle;</div>
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import android.util.Log;</div>
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import android.view.Menu;</div>
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import android.view.View;</div>
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import android.view.View.OnClickListener;</div>
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import android.widget.Button;</div>
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public class MainActivity extends Activity {</div>
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<span class="Apple-tab-span" style="white-space: pre;"> </span>@Override</div>
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<span class="Apple-tab-span" style="white-space: pre;"> </span>protected void onCreate(Bundle savedInstanceState) {</div>
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<span class="Apple-tab-span" style="white-space: pre;">  </span>super.onCreate(savedInstanceState);</div>
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<span class="Apple-tab-span" style="white-space: pre;">  </span>setContentView(R.layout.activity_main);</div>
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<span class="Apple-tab-span" style="white-space: pre;">  </span>// khai báo button </div>
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<span class="Apple-tab-span" style="white-space: pre;">  </span>Button btok = (Button)findViewById(R.id.button1);</div>
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<span class="Apple-tab-span" style="white-space: pre;">  </span>//event button</div>
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<span class="Apple-tab-span" style="white-space: pre;">  </span>btok.setOnClickListener(new OnClickListener() {</div>
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<span class="Apple-tab-span" style="white-space: pre;">   </span></div>
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<span class="Apple-tab-span" style="white-space: pre;">   </span>@Override</div>
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<span class="Apple-tab-span" style="white-space: pre;">   </span>public void onClick(View arg0) {</div>
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<span class="Apple-tab-span" style="white-space: pre;">    </span>// TODO Auto-generated method stub</div>
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<span class="Apple-tab-span" style="white-space: pre;">    </span>Log.v("check lỗi", "bạn đã biết cách sử dụng Log.v để kiểm tra code");</div>
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<span class="Apple-tab-span" style="white-space: pre;">   </span>}</div>
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<span class="Apple-tab-span" style="white-space: pre;">  </span>});</div>
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<span class="Apple-tab-span" style="white-space: pre;"> </span>}</div>
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<span class="Apple-tab-span" style="white-space: pre;"> </span>@Override</div>
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<span class="Apple-tab-span" style="white-space: pre;"> </span>public boolean onCreateOptionsMenu(Menu menu) {</div>
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<span class="Apple-tab-span" style="white-space: pre;">  </span>// Inflate the menu; this adds items to the action bar if it is present.</div>
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<span class="Apple-tab-span" style="white-space: pre;">  </span>getMenuInflater().inflate(R.menu.main, menu);</div>
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<span class="Apple-tab-span" style="white-space: pre;">  </span>return true;</div>
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<span class="Apple-tab-span" style="white-space: pre;"> </span>}</div>
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}</div>
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<span style="font-size: large;"><span style="background-color: white; border: 0px; font-family: Arimo, Arial, Helvetica, sans-serif; line-height: 22px; margin: 0px; padding: 0px;">Mọi thắc mắc các bạn liên hệ mình qua địa chỉ Gmail : svk10acntt@gmail.com hoặc Fb: </span><a href="https://www.facebook.com/pham.tienphong.37" style="-webkit-transition: all 0.2s linear; background-color: white; border: 0px; font-family: Arimo, Arial, Helvetica, sans-serif; line-height: 22px; margin: 0px; padding: 0px; text-decoration: none; transition: all 0.2s linear;">John Ly Phạm</a></span></div>
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Bài 17- log cat indandroid

Blog chia sẻ kinh nghiệm lập trình Android Chào các bạn hôm nay mình sẽ hướng dẫn các bạn làm thế nào đề xuất ra một thông báo ẩn dạng ...

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Bài 16 - full Screen in android

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<span style="font-size: large;">Blog chia sẻ kinh nghiệm lập trình Android</span><br />
<span style="font-size: large;">Chào các bạn hôm nay mình sẽ hướng dẫn các bạn làm thế nào để hiện thị một layout  mà không có tên tiêu đề ở phía trên cùng,</span><br />
<span style="font-size: large;"> Đầu tiên các bạn tạo một project. </span><br />
<span style="font-size: large;">Mình tạo một project đơn giản như thế này.</span><br />
<span style="font-size: large;"> Code xml:</span><br />
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"<br />
    android:layout_width="fill_parent"<br />
    android:layout_height="fill_parent"<br />
    android:background="#F34400"<br />
    android:orientation="vertical" ><br />
<br />
    <TextView<br />
        android:id="@+id/textView1"<br />
        android:layout_width="fill_parent"<br />
        android:layout_marginTop="50dp"<br />
        android:layout_height="wrap_content"<br />
        android:textColor="#FFFFFF"<br />
        android:gravity="center"<br />
        android:textSize="30dp"<br />
        android:text="full screen" /><br />
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</LinearLayout><br />
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<span style="font-size: large;">Layout hiển thị:</span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjF_23_7OW2EAv8wJYumWPqDUlqF7pE7VyU-mLyc4hTBUxKL3pnRXsdXePZn72Tgg_CpxE1_6houjzLDCpXQL6DJLzegfF-IQXZUx8TLH6531lh2c8m45MYAo_Xo9OtZ1Z7u6_wp724Sac/s1600/Capture.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-size: large;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjF_23_7OW2EAv8wJYumWPqDUlqF7pE7VyU-mLyc4hTBUxKL3pnRXsdXePZn72Tgg_CpxE1_6houjzLDCpXQL6DJLzegfF-IQXZUx8TLH6531lh2c8m45MYAo_Xo9OtZ1Z7u6_wp724Sac/s1600/Capture.PNG" /></span></a></div>
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<span style="font-size: large;">Chạy thử.</span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqP-xWcKL4NJdJoIEue2qgHwcyE4h2gEYv7VCsA93d2LF8PXLSimCZTJzmfdN134PHV8Y8QQecLyOB3slYHYjgC-qrj6ZComd5sstiss_afOHkhTQeh-huc40pQY8JxtFZ1X4Bn9l4fqE/s1600/Capture3.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-size: large;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqP-xWcKL4NJdJoIEue2qgHwcyE4h2gEYv7VCsA93d2LF8PXLSimCZTJzmfdN134PHV8Y8QQecLyOB3slYHYjgC-qrj6ZComd5sstiss_afOHkhTQeh-huc40pQY8JxtFZ1X4Bn9l4fqE/s1600/Capture3.PNG" /></span></a></div>
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<span style="font-size: large;"> Các bạn thấy thanh tiêu đề của layout hiện nên chiếm một khoảng màn hình, nhiều lúc bạn không muốn nó xuất hiện, đơn giản để làm nó biến mất thì các bạn làm như sau:</span><br />
<span style="font-size: large;"> Vào main.class thêm dòng code sau : </span><br />
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<span style="font-size: large;">Nhớ đặt dúng vị trí nhé, sau đó chạy ứng dụng, đây là kết quả.</span><br />
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<span style="font-size: large;">chúc các bạn thành công.</span><br />
<span style="border: 0px; color: #666666; font-family: Arimo, Arial, Helvetica, sans-serif; line-height: 22px; margin: 0px; padding: 0px;"><span style="background-color: white; border: 0px; font-family: inherit; margin: 0px; padding: 0px;"><span style="font-size: large;"><span style="border: 0px; margin: 0px; padding: 0px;">Mọi thắc mắc các bạn liên hệ mình qua địa chỉ Gmail : svk10acntt@gmail.com hoặc Fb: </span><a href="https://www.facebook.com/pham.tienphong.37" style="border: 0px; color: #ffc600; margin: 0px; padding: 0px; text-decoration: none;">John Ly Phạm</a></span></span></span><br />
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Bài 16 - full Screen in android

Blog chia sẻ kinh nghiệm lập trình Android Chào các bạn hôm nay mình sẽ hướng dẫn các bạn làm thế nào để hiện thị một layout mà không ...

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Bìa 15 - Radiobutton in android - 2

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<span style="font-size: large;">Blog chia sẻ kinh nghiệm lập trình Android</span><br />
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<span style="font-size: large;">Chào các bạn, tiếp tục bài 14, hôm nay mình sẽ hướng dẫn các bạn cách dùng Radiobutton với event của chúng luôn. Ở bài trước chúng ta bắt sự kiện thông qua button ok , bây giờ chúng ta bắt sự kiện ngay khi ấn click vào Radiobutton.</span><br />
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<span style="font-size: large;"> Tạo project mới. trong main_activity.xml các bạn cho thêm 2 nút radiobutton, cho vào radiogroup.</span><br />
<span style="font-size: large;">project này chúng ta sẽ demo cách chuyển 2G <=> 3G và thông báo thành công lên Toast.</span><br />
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<span style="font-size: large;">Code: mainactivity.xml</span><br />
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LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"<br />
    android:layout_width="fill_parent"<br />
    android:layout_height="fill_parent"<br />
    android:background="#000034"<br />
    android:orientation="vertical" ><br />
<br />
    <TextView<br />
        android:id="@+id/textView1"<br />
        android:layout_width="fill_parent"<br />
        android:layout_height="wrap_content"<br />
        android:gravity="center"<br />
        android:text="Demo Radiobutton"<br />
        android:textColor="#ffffff"<br />
        android:textSize="30dp" /><br />
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    <TextView<br />
        android:id="@+id/textView2"<br />
        android:layout_width="fill_parent"<br />
        android:layout_height="wrap_content"<br />
        android:layout_marginTop="22dp"<br />
        android:text="Chọn Loại Mạng"<br />
        android:textColor="#ffffff"<br />
        android:textSize="22dp" /><br />
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    <RadioGroup<br />
        android:id="@+id/rdoGroup"<br />
        android:layout_width="fill_parent"<br />
        android:layout_height="wrap_content"<br />
        android:background="#FF6534" ><br />
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        <RadioButton<br />
            android:id="@+id/rdo2g"<br />
            android:layout_width="fill_parent"<br />
            android:layout_height="wrap_content"<br />
            android:text="2G" /><br />
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        <RadioButton<br />
            android:id="@+id/rdo3g"<br />
            android:layout_width="fill_parent"<br />
            android:layout_height="wrap_content"<br />
            android:layout_marginTop="15dp"<br />
            android:text="3G" /><br />
    </RadioGroup><br />
        <Button<br />
            android:id="@+id/btexit"<br />
            android:layout_width="fill_parent"<br />
            android:layout_height="wrap_content"<br />
            android:layout_marginTop="20dp"<br />
            android:textColor="#ffffff"<br />
            android:text="Thoát" /><br />
    </LinearLayout><br />
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<span style="font-size: large;">Giao diện sau khi tạo được file xml. </span><br />
<span style="font-size: large;">  </span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgNnw6cO962Q2qEukzZjezZAt99W5r8JBZAvNxwRG4SjpWUwN3megAFCGDkasM6a1MZaAaA7L8TttR4YRY_XzeGfrFD3TqYgvZlmfBNuB-O4l3H8U3mSALC6A4Bqf1lDS-vGUMyc-RJW2E/s1600/Capture.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-size: large;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgNnw6cO962Q2qEukzZjezZAt99W5r8JBZAvNxwRG4SjpWUwN3megAFCGDkasM6a1MZaAaA7L8TttR4YRY_XzeGfrFD3TqYgvZlmfBNuB-O4l3H8U3mSALC6A4Bqf1lDS-vGUMyc-RJW2E/s1600/Capture.PNG" /></span></a></div>
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<span style="font-size: large;">Tiếp theo vào main class. </span><br />
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<span style="font-size: large;">full code main.class</span><br />
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package com.example.demo_radiobutton1;<br />
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import android.app.Activity;<br />
import android.app.AlertDialog;<br />
import android.content.Context;<br />
import android.content.DialogInterface;<br />
import android.os.Bundle;<br />
import android.view.View;<br />
import android.view.View.OnClickListener;<br />
import android.widget.Button;<br />
import android.widget.RadioButton;<br />
import android.widget.RadioGroup;<br />
import android.widget.TextView;<br />
import android.widget.Toast;<br />
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public class MainActivity extends Activity {<br />
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<span class="Apple-tab-span" style="white-space: pre;"> </span>Button btok, btexit;<br />
<span class="Apple-tab-span" style="white-space: pre;"> </span>Context context = this;<br />
<span class="Apple-tab-span" style="white-space: pre;"> </span>RadioButton rdo2g, rdo3g;<br />
<span class="Apple-tab-span" style="white-space: pre;"> </span>RadioGroup group;<br />
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<span class="Apple-tab-span" style="white-space: pre;"> </span>@Override<br />
<span class="Apple-tab-span" style="white-space: pre;"> </span>protected void onCreate(Bundle savedInstanceState) {<br />
<span class="Apple-tab-span" style="white-space: pre;">  </span>super.onCreate(savedInstanceState);<br />
<span class="Apple-tab-span" style="white-space: pre;">  </span>setContentView(R.layout.activity_main);<br />
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<span class="Apple-tab-span" style="white-space: pre;">  </span>// khai báo id<br />
<span class="Apple-tab-span" style="white-space: pre;">  </span>rdo2g = (RadioButton) findViewById(R.id.rdo2g);<br />
<span class="Apple-tab-span" style="white-space: pre;">  </span>rdo3g = (RadioButton) findViewById(R.id.rdo3g);<br />
<span class="Apple-tab-span" style="white-space: pre;">  </span>group = (RadioGroup) findViewById(R.id.rdoGroup);<br />
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<span class="Apple-tab-span" style="white-space: pre;">  </span>btexit = (Button) findViewById(R.id.btexit);<br />
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<span class="Apple-tab-span" style="white-space: pre;">  </span>// để mặc định là mạng 2g thì để radiobutton 1 được chọn trước<br />
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<span class="Apple-tab-span" style="white-space: pre;">  </span>rdo2g.setChecked(true);<br />
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<span class="Apple-tab-span" style="white-space: pre;">  </span>// gọi các phương thức<br />
<span class="Apple-tab-span" style="white-space: pre;">  </span>method_exit();<br />
<span class="Apple-tab-span" style="white-space: pre;">  </span>method_infor();<br />
<span class="Apple-tab-span" style="white-space: pre;"> </span>}<br />
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<span class="Apple-tab-span" style="white-space: pre;"> </span>// method okinfor<br />
<span class="Apple-tab-span" style="white-space: pre;"> </span>public void method_infor() {// sự kiện khi click vòa radiobutton 3g<br />
<span class="Apple-tab-span" style="white-space: pre;">  </span>rdo2g.setOnClickListener(new OnClickListener() {<br />
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<span class="Apple-tab-span" style="white-space: pre;">   </span>@Override<br />
<span class="Apple-tab-span" style="white-space: pre;">   </span>public void onClick(View arg0) {<br />
<span class="Apple-tab-span" style="white-space: pre;">    </span>// TODO Auto-generated method stub<br />
<span class="Apple-tab-span" style="white-space: pre;">    </span>if (rdo2g.isChecked()) {<br />
<span class="Apple-tab-span" style="white-space: pre;">     </span>Toast.makeText(getApplication(), "2G is connected", 1)<br />
<span class="Apple-tab-span" style="white-space: pre;">       </span>.show();<br />
<span class="Apple-tab-span" style="white-space: pre;">    </span>}<br />
<span class="Apple-tab-span" style="white-space: pre;">   </span>}<br />
<span class="Apple-tab-span" style="white-space: pre;">  </span>});<br />
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<span class="Apple-tab-span" style="white-space: pre;">  </span>// sự kiện khi click vòa radiobutton 3g<br />
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<span class="Apple-tab-span" style="white-space: pre;">  </span>rdo3g.setOnClickListener(new OnClickListener() {<br />
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<span class="Apple-tab-span" style="white-space: pre;">   </span>@Override<br />
<span class="Apple-tab-span" style="white-space: pre;">   </span>public void onClick(View v) {<br />
<span class="Apple-tab-span" style="white-space: pre;">    </span>if (rdo3g.isChecked()) {<br />
<span class="Apple-tab-span" style="white-space: pre;">     </span>Toast.makeText(getApplication(), "3g is connected", 1)<br />
<span class="Apple-tab-span" style="white-space: pre;">       </span>.show();<br />
<span class="Apple-tab-span" style="white-space: pre;">    </span>}<br />
<span class="Apple-tab-span" style="white-space: pre;">   </span>}<br />
<span class="Apple-tab-span" style="white-space: pre;">  </span>});<br />
<span class="Apple-tab-span" style="white-space: pre;"> </span>}<br />
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<span class="Apple-tab-span" style="white-space: pre;"> </span>// mothod exit<br />
<span class="Apple-tab-span" style="white-space: pre;"> </span>public void method_exit() {<br />
<span class="Apple-tab-span" style="white-space: pre;">  </span>btexit.setOnClickListener(new OnClickListener() {<br />
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<span class="Apple-tab-span" style="white-space: pre;">   </span>@Override<br />
<span class="Apple-tab-span" style="white-space: pre;">   </span>public void onClick(View v) {<br />
<span class="Apple-tab-span" style="white-space: pre;">    </span>AlertDialog.Builder builder = new AlertDialog.Builder(context);<br />
<span class="Apple-tab-span" style="white-space: pre;">    </span>builder.setTitle("thoát");<br />
<span class="Apple-tab-span" style="white-space: pre;">    </span>builder.setNegativeButton("không", null);<br />
<span class="Apple-tab-span" style="white-space: pre;">    </span>builder.setNeutralButton("có",<br />
<span class="Apple-tab-span" style="white-space: pre;">      </span>new DialogInterface.OnClickListener() {<br />
<span class="Apple-tab-span" style="white-space: pre;">       </span>@Override<br />
<span class="Apple-tab-span" style="white-space: pre;">       </span>public void onClick(DialogInterface dialog,<br />
<span class="Apple-tab-span" style="white-space: pre;">         </span>int which) {<br />
<span class="Apple-tab-span" style="white-space: pre;">        </span>// TODO Auto-generated method stub<br />
<span class="Apple-tab-span" style="white-space: pre;">        </span>System.exit(0);// thoát ứng dụng<br />
<span class="Apple-tab-span" style="white-space: pre;">       </span>}<br />
<span class="Apple-tab-span" style="white-space: pre;">      </span>});<br />
<span class="Apple-tab-span" style="white-space: pre;">    </span>builder.show();// gọi dialog khi clik button ok<br />
<span class="Apple-tab-span" style="white-space: pre;">   </span>}<br />
<span class="Apple-tab-span" style="white-space: pre;">  </span>});<br />
<span class="Apple-tab-span" style="white-space: pre;"> </span>}<br />
}<br />
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<span style="font-size: large;">Giải thích code : </span></div>
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<span style="font-size: large;">ok. các bạn chạy chương trình , kết quả được như sau :</span><br />
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<span style="font-size: large;">   Sau bài này mình tin các bạn sẽ sử dụng thành thạo Radiobutton. Bài sau mình hướng dẫn các bạn sử dụng processbar.</span></div>
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<span style="font-size: large;"> <span style="background-color: #caff70; color: #666666; font-family: Arimo, Arial, Helvetica, sans-serif; line-height: 22px;">chúc các bạn thành công.</span></span></div>
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<span style="border: 0px; margin: 0px; padding: 0px;"><span style="font-size: large;"><span style="background-color: white; border: 0px; margin: 0px; padding: 0px;">Mọi thắc mắc các bạn liên hệ mình qua địa chỉ Gmail : svk10acntt@gmail.com hoặc Fb: </span><a href="https://www.facebook.com/pham.tienphong.37" style="-webkit-transition: all 0.2s linear; background-color: white; border: 0px; color: #ffc600; margin: 0px; padding: 0px; text-decoration: none; transition: all 0.2s linear;">John Ly Phạm</a></span></span></div>
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Bìa 15 - Radiobutton in android - 2

Blog chia sẻ kinh nghiệm lập trình Android Chào các bạn, tiếp tục bài 14, hôm nay mình sẽ hướng dẫn các bạn cách dùng Radiobutton với ...

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Bài 14 - Radiobutton in android -1

<span style="font-family: inherit;"><br /></span>
<span style="font-family: inherit;">Blog chia sẻ kinh nghiệm lập trình Android</span><br />
<span style="font-family: inherit;"><br /></span>
<span style="font-family: inherit;">Chào các bạn, bài trước mình đã hướng dẫn các bạn làm quen và sử dụng checkbox hôm nay mình sẽ hướng dẫn các bạn một loại chọn nữa là radio button.</span><br />
<span style="font-family: inherit;"> Radiobutton thường được đưa ra 2 hoặc nhiều hơn hai phần tử trong đó người dùng chỉ được chọn một thứ , để làm được như vậy chúng ta cần nhóm chúng vào một nhóm đó chính là GruopRadiobutton để khi người dùng chọn thì chỉ chọn được duy nhất 1 radiobutton.</span><br />
<span style="font-family: inherit;"> Bài hôm nay mình sẽ hướng dẫn các bạn cách tạo và dùng Radiobutton và Gruop nó một cách đơn giản nhất. </span><br />
<span style="font-family: inherit;"> Các bạn tạo cho mình một project mình tạo có tên là Demo_radiobutton1;</span><br />
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<span style="font-family: inherit;"><b>activity_main.xml</b></span><br />
<b><span style="font-family: inherit;"><br /></span>
<span style="font-family: inherit;"><br /></span>
<span style="font-family: inherit;"><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"</span></b><br />
<span style="font-family: inherit;"><b>    android:layout_width="fill_parent"</b></span><br />
<span style="font-family: inherit;"><b>    android:layout_height="fill_parent"</b></span><br />
<span style="font-family: inherit;"><b>    android:background="#000034"</b></span><br />
<span style="font-family: inherit;"><b>    android:orientation="vertical" ></b></span><br />
<b><span style="font-family: inherit;"><br /></span>
<span style="font-family: inherit;">    <TextView</span></b><br />
<span style="font-family: inherit;"><b>        android:id="@+id/textView1"</b></span><br />
<span style="font-family: inherit;"><b>        android:layout_width="fill_parent"</b></span><br />
<span style="font-family: inherit;"><b>        android:layout_height="wrap_content"</b></span><br />
<span style="font-family: inherit;"><b>        android:gravity="center"</b></span><br />
<span style="font-family: inherit;"><b>        android:text="Demo Radiobutton"</b></span><br />
<span style="font-family: inherit;"><b>        android:textColor="#ffffff"</b></span><br />
<span style="font-family: inherit;"><b>        android:textSize="30dp" /></b></span><br />
<b><span style="font-family: inherit;"><br /></span>
<span style="font-family: inherit;">    <TextView</span></b><br />
<span style="font-family: inherit;"><b>        android:id="@+id/textView2"</b></span><br />
<span style="font-family: inherit;"><b>        android:layout_width="fill_parent"</b></span><br />
<span style="font-family: inherit;"><b>        android:layout_height="wrap_content"</b></span><br />
<span style="font-family: inherit;"><b>        android:layout_marginTop="22dp"</b></span><br />
<span style="font-family: inherit;"><b>        android:text="Chọn Loại Mạng"</b></span><br />
<span style="font-family: inherit;"><b>        android:textColor="#ffffff"</b></span><br />
<span style="font-family: inherit;"><b>        android:textSize="22dp" /></b></span><br />
<b><span style="font-family: inherit;"><br /></span>
<span style="font-family: inherit;">    <RadioGroup</span></b><br />
<span style="font-family: inherit;"><b>        android:id="@+id/rdoGroup"</b></span><br />
<span style="font-family: inherit;"><b>        android:layout_width="fill_parent"</b></span><br />
<span style="font-family: inherit;"><b>        android:layout_height="wrap_content"</b></span><br />
<span style="font-family: inherit;"><b>        android:background="#FF6534" ></b></span><br />
<b><span style="font-family: inherit;"><br /></span>
<span style="font-family: inherit;">        <RadioButton</span></b><br />
<span style="font-family: inherit;"><b>            android:id="@+id/rdo2g"</b></span><br />
<span style="font-family: inherit;"><b>            android:layout_width="fill_parent"</b></span><br />
<span style="font-family: inherit;"><b>            android:layout_height="wrap_content"</b></span><br />
<span style="font-family: inherit;"><b>            android:text="RadioButton" /></b></span><br />
<b><span style="font-family: inherit;"><br /></span>
<span style="font-family: inherit;">        <RadioButton</span></b><br />
<span style="font-family: inherit;"><b>            android:id="@+id/rdo3g"</b></span><br />
<span style="font-family: inherit;"><b>            android:layout_width="fill_parent"</b></span><br />
<span style="font-family: inherit;"><b>            android:layout_height="wrap_content"</b></span><br />
<span style="font-family: inherit;"><b>            android:layout_marginTop="15dp"</b></span><br />
<span style="font-family: inherit;"><b>            android:text="RadioButton" /></b></span><br />
<span style="font-family: inherit;"><b>    </RadioGroup></b></span><br />
<b><span style="font-family: inherit;"><br /></span>
<span style="font-family: inherit;">    <TextView</span></b><br />
<span style="font-family: inherit;"><b>        android:id="@+id/tvshowinfor"</b></span><br />
<span style="font-family: inherit;"><b>        android:layout_width="fill_parent"</b></span><br />
<span style="font-family: inherit;"><b>        android:layout_height="wrap_content"</b></span><br />
<span style="font-family: inherit;"><b>        android:layout_marginTop="15dp"</b></span><br />
<span style="font-family: inherit;"><b>        android:background="#0FF453"</b></span><br />
<span style="font-family: inherit;"><b>        android:text="Thông tin: " /></b></span><br />
<b><span style="font-family: inherit;"><br /></span>
<span style="font-family: inherit;">    <LinearLayout</span></b><br />
<span style="font-family: inherit;"><b>        android:layout_width="match_parent"</b></span><br />
<span style="font-family: inherit;"><b>        android:layout_height="wrap_content"</b></span><br />
<span style="font-family: inherit;"><b>        android:layout_marginTop="25dp"</b></span><br />
<span style="font-family: inherit;"><b>        android:orientation="horizontal" ></b></span><br />
<b><span style="font-family: inherit;"><br /></span>
<span style="font-family: inherit;">        <Button</span></b><br />
<span style="font-family: inherit;"><b>            android:id="@+id/btok"</b></span><br />
<span style="font-family: inherit;"><b>            android:layout_width="match_parent"</b></span><br />
<span style="font-family: inherit;"><b>            android:layout_height="wrap_content"</b></span><br />
<span style="font-family: inherit;"><b>            android:layout_weight="5"</b></span><br />
<span style="font-family: inherit;"><b>            android:text="Ok" /></b></span><br />
<b><span style="font-family: inherit;"><br /></span>
<span style="font-family: inherit;">        <Button</span></b><br />
<span style="font-family: inherit;"><b>            android:id="@+id/btexit"</b></span><br />
<span style="font-family: inherit;"><b>            android:layout_width="match_parent"</b></span><br />
<span style="font-family: inherit;"><b>            android:layout_height="wrap_content"</b></span><br />
<span style="font-family: inherit;"><b>            android:layout_weight="5"</b></span><br />
<span style="font-family: inherit;"><b>            android:text="Thoát" /></b></span><br />
<span style="font-family: inherit;"><b>    </LinearLayout></b></span><br />
<b><span style="font-family: inherit;"><br /></span>
<span style="font-family: inherit;"></LinearLayout></span></b><br />
<span style="font-family: inherit;"><br /></span>
<span style="font-family: inherit;">Trong đó : </span><br />
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<span style="font-family: inherit;">    <b><RadioGroup</b></span><br />
<span style="font-family: inherit;"><b>        android:id="@+id/rdoGroup"</b></span><br />
<span style="font-family: inherit;"><b>        android:layout_width="fill_parent"</b></span><br />
<span style="font-family: inherit;"><b>        android:layout_height="wrap_content"</b></span><br />
<span style="font-family: inherit;"><b>        android:background="#FF6534" ></b></span><br />
<b><span style="font-family: inherit;"><br /></span>
<span style="font-family: inherit;">        <RadioButton</span></b><br />
<span style="font-family: inherit;"><b>            android:id="@+id/rdo2g"</b></span><br />
<span style="font-family: inherit;"><b>            android:layout_width="fill_parent"</b></span><br />
<span style="font-family: inherit;"><b>            android:layout_height="wrap_content"</b></span><br />
<span style="font-family: inherit;"><b>            android:text="RadioButton" /></b></span><br />
<b><span style="font-family: inherit;"><br /></span>
<span style="font-family: inherit;">        <RadioButton</span></b><br />
<span style="font-family: inherit;"><b>            android:id="@+id/rdo3g"</b></span><br />
<span style="font-family: inherit;"><b>            android:layout_width="fill_parent"</b></span><br />
<span style="font-family: inherit;"><b>            android:layout_height="wrap_content"</b></span><br />
<span style="font-family: inherit;"><b>            android:layout_marginTop="15dp"</b></span><br />
<span style="font-family: inherit;"><b>            android:text="RadioButton" /></b></span><br />
<span style="font-family: inherit;"><b>    </RadioGroup></b></span><br />
<b><span style="font-family: inherit;"><br /></span>
<span style="font-family: inherit;">đây chính là 2 radiobutton mình tạo ra , được bao gói trong RadioGroup , nếu không có RadioGroup thì các RadioButton sẽ không có liên kết với nhau, như vậy lại giống như checkbox.</span></b><br />
<b><span style="font-family: inherit;"><br /></span>
<span style="font-family: inherit;">Tạo 1 button để lấy giá trị mà người dùng chọn Radiobutton</span></b><br />
<b><span style="font-family: inherit;"><br /></span>
<span style="font-family: inherit;">   <Button</span></b><br />
<span style="font-family: inherit;"><b>            android:id="@+id/btok"</b></span><br />
<span style="font-family: inherit;"><b>            android:layout_width="match_parent"</b></span><br />
<span style="font-family: inherit;"><b>            android:layout_height="wrap_content"</b></span><br />
<span style="font-family: inherit;"><b>            android:layout_weight="5"</b></span><br />
<span style="font-family: inherit;"><b>            android:text="Ok" /></b></span><br />
<b><span style="font-family: inherit;"><br /></span>
<span style="font-family: inherit;">Tiếp đó lấy event của button Ok hiển thị thông tin chọn lên textview : </span></b><br />
<b><span style="font-family: inherit;"><br /></span>
<span style="font-family: inherit;"> <TextView</span></b><br />
<span style="font-family: inherit;"><b>        android:id="@+id/tvshowinfor"</b></span><br />
<span style="font-family: inherit;"><b>        android:layout_width="fill_parent"</b></span><br />
<span style="font-family: inherit;"><b>        android:layout_height="wrap_content"</b></span><br />
<span style="font-family: inherit;"><b>        android:layout_marginTop="15dp"</b></span><br />
<span style="font-family: inherit;"><b>        android:background="#0FF453"</b></span><br />
<span style="font-family: inherit;"><b>        android:text="Thông tin: " /></b></span><br />
<span style="font-family: inherit;"><br /></span>
<span style="font-family: inherit;">Giao diện của đoạn code trên như sau : </span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhoAwwMHSPrLMSOl9mntSJxCjxtVtw66ufXHGINITixqP7vjArQsLb8eOXZXEo-jvARV781FjoOuO5RAqfpk_6E8zUhoZrll4zxbdnQmQQ2m4XVNOMy4xx5iGbilBt6JGhQm_Obw2KdE6g/s1600/Capture.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: inherit;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhoAwwMHSPrLMSOl9mntSJxCjxtVtw66ufXHGINITixqP7vjArQsLb8eOXZXEo-jvARV781FjoOuO5RAqfpk_6E8zUhoZrll4zxbdnQmQQ2m4XVNOMy4xx5iGbilBt6JGhQm_Obw2KdE6g/s1600/Capture.PNG" /></span></a></div>
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<span style="font-family: inherit;">Xử lí trên Mainactivity.class</span><br />
<span style="font-family: inherit;"> Khai báo các phần tử bên main_activity.xml</span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhKHAy83RKyxuimIybsW9km3P6v232UjT_V-Hh6qYAYTJRsX8SrT0hwLrC-zq946t8Y7htOKaV_zjxk0HcM-L_FYOu8iWbwMkyKmEABuZo_dQZ4MpsUOPuoE68g7liyuY44SY-j-oWfBJU/s1600/Capture.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: inherit;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhKHAy83RKyxuimIybsW9km3P6v232UjT_V-Hh6qYAYTJRsX8SrT0hwLrC-zq946t8Y7htOKaV_zjxk0HcM-L_FYOu8iWbwMkyKmEABuZo_dQZ4MpsUOPuoE68g7liyuY44SY-j-oWfBJU/s1600/Capture.PNG" /></span></a></div>
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<span style="font-family: inherit;">Mình tạo tiếp các phương thức của button ok và button exit:</span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjQrzxIThXKPv9VeTAWSXtpcCqqv7sGjEzn4MW4-ZZJfP1FdVEPoD3eDv6pRcw8ljE_-c6GwXtcrGQB1WgEk6lz1QxF2UFES8yLzI0LNafhQMdbPy5MCG4oPr4dDlXQ1m9cLwluTrD9d8Y/s1600/Capture.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: inherit;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjQrzxIThXKPv9VeTAWSXtpcCqqv7sGjEzn4MW4-ZZJfP1FdVEPoD3eDv6pRcw8ljE_-c6GwXtcrGQB1WgEk6lz1QxF2UFES8yLzI0LNafhQMdbPy5MCG4oPr4dDlXQ1m9cLwluTrD9d8Y/s1600/Capture.PNG" /></span></a></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhAkZ6PEcRmSgM8NEEXsDKO8QiW4OH6NjpkZxgvBZvoR6lPa9ZhRknm9mu1CuHmEPWPcJyn2PrRxhdCdEITeGcLDC3p1T0RTho32rK15psqYGLzfFaC_jQ3NhwUZoB7k3M9eIzJrHI1xvQ/s1600/Capture1.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: inherit;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhAkZ6PEcRmSgM8NEEXsDKO8QiW4OH6NjpkZxgvBZvoR6lPa9ZhRknm9mu1CuHmEPWPcJyn2PrRxhdCdEITeGcLDC3p1T0RTho32rK15psqYGLzfFaC_jQ3NhwUZoB7k3M9eIzJrHI1xvQ/s1600/Capture1.PNG" /></span></a></div>
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<span style="font-family: inherit;">full code MainActivity.class</span></div>
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<span style="font-family: inherit;">Bạn Run app sẽ được ứng dụng có hình như bên dưới.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgfwnhI1khyphenhyphen8eZkbjEsHiCpuYXJaH0hyJp9crNfnUXevQwwbCGcDzYGWODyDe2gV3tc1dhs3zTtd9nNdZsN36sdhu_fSamFEfvCEDq1UawrntOFBayNh15_0t3HSLP4Ua3AEaVoySdKNYc/s1600/Capture2.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: inherit;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgfwnhI1khyphenhyphen8eZkbjEsHiCpuYXJaH0hyJp9crNfnUXevQwwbCGcDzYGWODyDe2gV3tc1dhs3zTtd9nNdZsN36sdhu_fSamFEfvCEDq1UawrntOFBayNh15_0t3HSLP4Ua3AEaVoySdKNYc/s1600/Capture2.PNG" /></span></a></div>
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<span style="font-family: inherit;">Các bạn test thử các sự kiện. khi chạy ứng dụng thì radiobutton 2G được chọn ngay đầu tiên vì mình đã để mặc định là 2G được chọn bằng lệnh :</span><br />
<span style="font-family: inherit;"><br /></span>
<span style="font-family: inherit;"><span class="Apple-tab-span" style="white-space: pre;"> </span>// để mặc định là mạng 2g thì để radiobutton 1 được chọn trước</span><br />
<span class="Apple-tab-span" style="white-space: pre;"><span style="font-family: inherit;">  </span></span><br />
<span style="font-family: inherit;"><span class="Apple-tab-span" style="white-space: pre;">  </span>rdo2g.setChecked(true);</span><br />
<span style="font-family: inherit;"><br /></span>
<span style="font-family: inherit;">Khác với checkbox , với Radiobutton bạn chỉ cần có Group nó lại là nó sẽ chọn 1 trong số các radiobutton rất đáng chú ý phải không các bạn.</span><br />
<span style="font-family: inherit;"><br /></span>
<span style="font-family: inherit;">Đây là hình ảnh chạy của ứng dụng : </span><br />
<span style="font-family: inherit;"><br /></span>
<span style="font-family: inherit;"><br /></span>
<br />
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiCvUUOaT9iVGskaYcRP8GXQon5bJ6hXXYyxbFLLY6OTWkzadX5bGJvO24U5GUvKejJvLLUzXZ-Rzwnq47CuDmkThgxjwgXchpGeRMj9gQYEzXvSKgzdPl92SVeI9JjJDbGQCpc1t4QUWc/s1600/Capture.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: inherit;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiCvUUOaT9iVGskaYcRP8GXQon5bJ6hXXYyxbFLLY6OTWkzadX5bGJvO24U5GUvKejJvLLUzXZ-Rzwnq47CuDmkThgxjwgXchpGeRMj9gQYEzXvSKgzdPl92SVeI9JjJDbGQCpc1t4QUWc/s1600/Capture.PNG" /></span></a></div>
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<span style="font-family: inherit;">CLICK BUTTON OK</span></div>
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<span style="font-family: inherit;"><br /></span>
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<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgsq0Z9HvJLyUJChttwibI8JcLSafH7E26Lkjpc6c3flexR2NvWSoBbUzD8aaAWcIc4umb2vgOm7KHL6-9ivWB6nCmo3_YjVpaxdBU2k2AN57lUkLONH75hnAGS8cK8mG5U_6QAJi1Y3Zk/s1600/Capture1.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: inherit;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgsq0Z9HvJLyUJChttwibI8JcLSafH7E26Lkjpc6c3flexR2NvWSoBbUzD8aaAWcIc4umb2vgOm7KHL6-9ivWB6nCmo3_YjVpaxdBU2k2AN57lUkLONH75hnAGS8cK8mG5U_6QAJi1Y3Zk/s1600/Capture1.PNG" /></span></a></div>
<div class="separator" style="clear: both; text-align: center;">
<span style="font-family: inherit;"><br /></span></div>
<div class="separator" style="clear: both; text-align: center;">
<span style="font-family: inherit;">CLICK BUTTON OK</span></div>
<div class="separator" style="clear: both; text-align: center;">
<span style="font-family: inherit;"><br /></span></div>
<br />
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiYIkdpXfKSiOzeAukkjtREA6xCRtAgb_M8_ad8uS9DPCyq1YK1z-iLJ_diRIf2Ooh2Jk_cLMSRWOC9-jmr_OQmcVUpnLF0szZTbgN1RDoL_2e9wOxE2xchu_mKRO8WIQrCOtmfHljygGI/s1600/Capture2.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: inherit;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiYIkdpXfKSiOzeAukkjtREA6xCRtAgb_M8_ad8uS9DPCyq1YK1z-iLJ_diRIf2Ooh2Jk_cLMSRWOC9-jmr_OQmcVUpnLF0szZTbgN1RDoL_2e9wOxE2xchu_mKRO8WIQrCOtmfHljygGI/s1600/Capture2.PNG" /></span></a></div>
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<span style="font-family: inherit;"><br /></span></div>
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<span style="font-family: inherit;">CLICK BUTTON THOÁT</span></div>
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<span style="font-family: inherit;"><br /></span></div>
<div class="separator" style="clear: both; text-align: left;">
<span style="font-family: inherit;">Bài sau mình sẽ hướng dẫn các bạn dùng event của radiobutton luôn, không thông qua event của Button nữa,</span></div>
<div class="separator" style="clear: both; text-align: left;">
<span style="font-family: inherit;">bài học hôm nay tới đây là kết thúc, hi vọng các bạn thấy có ích và vận dụng nó vào ứng dụng của mình thật tuyệt vời.</span></div>
<div class="separator" style="clear: both; text-align: left;">
<b><span style="font-family: inherit;"><br /></span></b></div>
<div class="separator" style="clear: both; text-align: left;">
<b><span style="font-family: inherit;"><span style="background-color: white; border: 0px; line-height: 22px; margin: 0px; padding: 0px;">Mọi thắc mắc các bạn liên hệ mình qua địa chỉ Gmail : svk10acntt@gmail.com hoặc Fb: </span><a href="https://www.facebook.com/pham.tienphong.37" style="-webkit-transition: all 0.2s linear; background-color: white; border: 0px; line-height: 22px; margin: 0px; padding: 0px; text-decoration: none; transition: all 0.2s linear;">John Ly Phạm</a></span></b></div>
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<br />
<div style="margin: 5px 20px 20px;">
<pre class="alt2" dir="ltr" style="border: 1px inset; height: 200px; margin: 0px; overflow: auto; padding: 6px; text-align: left; width: 640px;">
package com.example.demo_radiobutton1;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;

public class MainActivity extends Activity {

Button btok,btexit;
 Context context= this;
 RadioButton rdo2g,rdo3g;
 TextView tvshowinfor;
 RadioGroup group ;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  // khai báo id
  rdo2g=(RadioButton)findViewById(R.id.rdo2g);
  rdo3g=(RadioButton)findViewById(R.id.rdo3g);
  group=(RadioGroup)findViewById(R.id.rdoGroup);
  
  btexit=(Button)findViewById(R.id.btexit);
  btok=(Button)findViewById(R.id.btok);
  
  tvshowinfor=(TextView)findViewById(R.id.tvshowinfor);
  
  // để mặc định là mạng 2g thì để radiobutton 1 được chọn trước
  
  rdo2g.setChecked(true);
  
  // gọi các phương thức
  method_exit();
  method_infor();
 }
 
 // method okinfor
 public void method_infor()
 {btok.setOnClickListener(new OnClickListener() {
  
  @Override
  public void onClick(View arg0) {
   if(rdo2g.isChecked())
   {
    tvshowinfor.setText("Thông tin: "+ "Bạn đang dùng mạng 2G");
   }
   if(rdo3g.isChecked()){
    tvshowinfor.setText("Thông tin: "+ "Bạn đang dùng mạng 3G");
   }
   
  }
 });
 }
 //mothod exit
  public void method_exit()
  {
   btexit.setOnClickListener(new OnClickListener() {
  
  @Override
  public void onClick(View v) {
   AlertDialog.Builder builder = new AlertDialog.Builder(context);
   builder.setTitle("thoát");
   builder.setNegativeButton("không", null);
   builder.setNeutralButton("có", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
     // TODO Auto-generated method stub
     System.exit(0);// thoát ứng dụng
    }
   });
   builder.show();// gọi dialog khi clik button ok
  }
 });
  }
}

</pre>
</div>
<

Bài 14 - Radiobutton in android -1

Blog chia sẻ kinh nghiệm lập trình Android Chào các bạn, bài trước mình đã hướng dẫn các bạn làm quen và sử dụng checkbox hôm nay mình sẽ...

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Bài 13 check box in android -2

<br />
Blog chia sẻ kinh nghiệm lập trình Android<br />
Chào các bạn hôm nay mình sẽ hướng dẫn các bạn cách bắt sự kiện ngay sau khi tick vào checkbox hay bỏ tích khỏi check box, như đã hướng dẫn ở bài trước chúng ta không sử dụng event cho check box mà sử dụng chekbox thông qua event của button.<br />
 Các bạn tạo 1 project với tên các bạn đặt tùy ý, trong file mainactivity.xml các bạn thêm cho mình một checkbox có id là check<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhNkQehQn0qd_XMNdE10p8oYMXLv78ZdSb5XTxGMqmBtWi_6xXPCuPB17iiKVinKk6gQ4cGSixNWFBCeJ9m9FfGIIFwV3XDupgofXfwWavPmxcqhptln2_JcWbDPvuNe0HBpbL6ZmXEV3w/s1600/Capture.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhNkQehQn0qd_XMNdE10p8oYMXLv78ZdSb5XTxGMqmBtWi_6xXPCuPB17iiKVinKk6gQ4cGSixNWFBCeJ9m9FfGIIFwV3XDupgofXfwWavPmxcqhptln2_JcWbDPvuNe0HBpbL6ZmXEV3w/s1600/Capture.PNG" /></a></div>
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Code: </div>
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<b><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"</b></div>
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<b>    android:layout_width="fill_parent"</b></div>
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<b>    android:layout_height="fill_parent"</b></div>
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<b>    android:background="#000FFF"</b></div>
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<b>    android:orientation="vertical" ></b></div>
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<b><br /></b></div>
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<b>    <TextView</b></div>
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<b>        android:id="@+id/textView1"</b></div>
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<b>        android:layout_width="fill_parent"</b></div>
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<b>        android:layout_height="wrap_content"</b></div>
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<b>        android:textColor="#FFFFFF"</b></div>
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<b>        android:textSize="25dp"</b></div>
<div class="separator" style="clear: both;">
<b>        android:gravity="center"</b></div>
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<b>        android:text="Demo Check box in android" /></b></div>
<div class="separator" style="clear: both;">
<b><LinearLayout</b></div>
<div class="separator" style="clear: both;">
<b>    android:layout_marginTop="20dp"</b></div>
<div class="separator" style="clear: both;">
<b>   <span class="Apple-tab-span" style="white-space: pre;">  </span> android:layout_width="fill_parent"</b></div>
<div class="separator" style="clear: both;">
<b>        android:layout_height="wrap_content"</b></div>
<div class="separator" style="clear: both;">
<b>        android:background="#FF45FF"</b></div>
<div class="separator" style="clear: both;">
<b>        android:orientation="vertical" ></b></div>
<div class="separator" style="clear: both;">
<b>    <TextView</b></div>
<div class="separator" style="clear: both;">
<b>        android:id="@+id/textView2"</b></div>
<div class="separator" style="clear: both;">
<b>        android:layout_width="fill_parent"</b></div>
<div class="separator" style="clear: both;">
<b>        android:layout_height="wrap_content"</b></div>
<div class="separator" style="clear: both;">
<b>        android:gravity="center"</b></div>
<div class="separator" style="clear: both;">
<b>        android:textSize="20dp"</b></div>
<div class="separator" style="clear: both;">
<b>        android:background="#ffffff"</b></div>
<div class="separator" style="clear: both;">
<b>        android:text="chuyển 2G/3G" /></b></div>
<div class="separator" style="clear: both;">
<b><br /></b></div>
<div class="separator" style="clear: both;">
<b>    <CheckBox</b></div>
<div class="separator" style="clear: both;">
<b>        android:id="@+id/chb2g3g"</b></div>
<div class="separator" style="clear: both;">
<b>        android:layout_marginTop="20dp"</b></div>
<div class="separator" style="clear: both;">
<b>        android:layout_width="266dp"</b></div>
<div class="separator" style="clear: both;">
<b>        android:layout_height="wrap_content"</b></div>
<div class="separator" style="clear: both;">
<b>        android:gravity="center"</b></div>
<div class="separator" style="clear: both;">
<b>        android:layout_marginLeft="30dp"</b></div>
<div class="separator" style="clear: both;">
<b>        android:text="2G is available "</b></div>
<div class="separator" style="clear: both;">
<b>        android:layout_marginBottom="20dp"</b></div>
<div class="separator" style="clear: both;">
<b>        android:textColor="#FFFFFF" /></b></div>
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<b>    </b></div>
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<b>    </LinearLayout></b></div>
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<b><br /></b></div>
<div class="separator" style="clear: both;">
<b>    <Button</b></div>
<div class="separator" style="clear: both;">
<b>        android:id="@+id/btexit"</b></div>
<div class="separator" style="clear: both;">
<b>        android:layout_width="fill_parent"</b></div>
<div class="separator" style="clear: both;">
<b>        android:layout_height="wrap_content"</b></div>
<div class="separator" style="clear: both;">
<b>        android:layout_marginTop="30dp"</b></div>
<div class="separator" style="clear: both;">
<b>        android:text="exit" /></b></div>
<div class="separator" style="clear: both;">
<b><br /></b></div>
<div class="separator" style="clear: both;">
<b></LinearLayout></b></div>
<div class="separator" style="clear: both;">
<br /></div>
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<br /></div>
<div class="separator" style="clear: both;">
Vậy là xong phần giao diện, các bạn chuyển sang phần main.class để tạo event cho checkbox</div>
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<br /></div>
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<br /></div>
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<b>//tạo event cho checkbox</b></div>
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<b><span class="Apple-tab-span" style="white-space: pre;">  </span>checkBox.setOnClickListener(new OnClickListener() {</b></div>
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<span class="Apple-tab-span" style="white-space: pre;"><b>   </b></span></div>
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<b><span class="Apple-tab-span" style="white-space: pre;">   </span>@Override</b></div>
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<b><span class="Apple-tab-span" style="white-space: pre;">   </span>public void onClick(View v) {</b></div>
<div class="separator" style="clear: both;">
<span class="Apple-tab-span" style="white-space: pre;"><b>   </b></span></div>
<div class="separator" style="clear: both;">
<b><span class="Apple-tab-span" style="white-space: pre;">   </span>}</b></div>
<div class="separator" style="clear: both;">
<b><span class="Apple-tab-span" style="white-space: pre;">  </span>});</b></div>
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<b><br /></b></div>
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<br /></div>
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<br /></div>
<div class="separator" style="clear: both;">
<br /></div>
<div>
Sau khi hoàn tất các công đoạn , chúng ta chạy thử và ứng dụng sẽ như thế này .</div>
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<div style="margin: 5px 20px 20px;">
<pre class="alt2" dir="ltr" style="border: 1px inset; height: 200px; margin: 0px; overflow: auto; padding: 6px; text-align: left; width: 640px;">

full code main.class

package com.example.demo_chekbox;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.Toast;

public class MainActivity extends Activity {
    Button btexit;
    CheckBox checkBox;
    // khởi tạo context để sử dụng Dialog
    Context context=this;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  // khai báo Id
  btexit=(Button)findViewById(R.id.btexit);
  checkBox=(CheckBox)findViewById(R.id.chb2g3g);
  
  // gọi phương thức sử lí checkboxx
  chekbox2g3g();
  
  // gọi phương thức  thoát khỏi ứng dụng
  method_exit();
 }//oncreate
 
 // tạo phương thức sử lí checkbox
 public void chekbox2g3g()
 {
  //tạo event cho checkbox
  checkBox.setOnClickListener(new OnClickListener() {
   
   @Override
   public void onClick(View v) {
    // mặc định ban đầu check box chưa đk tích và ở chế độ 2 G
    //  khi click vào check box sẽ chuyển lên 3G 
    if(checkBox.isChecked())
    {
     // xử lí khi check box được chọn
     checkBox.setText("3G is available");// thay đổi text của check box
     Toast.makeText(getApplication(), "Mạng 3G", 1).show();
     
    }else// chỉ ở 2G nếu checkboxx không được check
    {
     // xử lí khi check box KHÔNG được chọn
     checkBox.setText("2G is available");// thay đổi text của check box
     Toast.makeText(getApplication(), "Mạng 2G", 1).show();
     
    }
   }
  });
  
 }
 // phương thức thoát ưng dụng
 public void method_exit()
 { btexit.setOnClickListener(new OnClickListener() {
  
  @Override
  public void onClick(View v) {
   //khởi tạo dialog hỏi xem có thoát hay không
   AlertDialog.Builder b  = new AlertDialog.Builder(context);
   b.setTitle("Thoát ứng dụng");// tiêu đề của dialog
   b.setMessage(" Thông báo !");//để viết thông báo của dialog
   b.setNegativeButton("No", null);// tạo nút No trong dialog và khi click vào
   // thì không làm gì cả
   
   b.setNeutralButton("Yes", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface arg0, int arg1) {
     // tạo nut "Yes" trên dialog khi nhấn vào sẽ thoát khỏi ứng dụng
     System.exit(0);
    }
   });
   // sau khi có đầy đủ các thuốc tính của dialog thì gọi dialog khi nhấn Button exit
   b.show();
  }
 });
  
 }
}

</pre>
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<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgqOSN0TG9GtiqiPdp7d5mMRy5dd0zIDBqkEh9tiB0nE1NLC0uLlLJgxbtn-UiB3i_YiQilNocy340awHL42TawFK_LwPrEunwn5V2lKtWCCPCnXCi7ugvVU-sYo424RdwTSS35ylMNGQw/s1600/Capture.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgqOSN0TG9GtiqiPdp7d5mMRy5dd0zIDBqkEh9tiB0nE1NLC0uLlLJgxbtn-UiB3i_YiQilNocy340awHL42TawFK_LwPrEunwn5V2lKtWCCPCnXCi7ugvVU-sYo424RdwTSS35ylMNGQw/s1600/Capture.PNG" /></a></div>
<div class="separator" style="clear: both; text-align: center;">
<br /></div>
<div class="separator" style="clear: both; text-align: center;">
Vào giao diện đầu tiên khi chưa chọn checkbox</div>
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<br /></div>
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Chọn checkbox lập tức toast sẽ hiện thông báo chuyển sang mạng 3g đồng thời text của checkbox cũng chuển sang mạng 3G</div>
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<div style="text-align: center;">
 chọn Exit thì dialog hỏi thoát sẽ xuất hiện</div>
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<br /></div>
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<span style="background-color: white; border: 0px; font-family: Arimo, Arial, Helvetica, sans-serif; line-height: 22px; margin: 0px; padding: 0px; text-align: left;">Chúc các bạn thành công.</span></div>
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<span style="background-color: white; border: 0px; font-family: Arimo, Arial, Helvetica, sans-serif; line-height: 22px; margin: 0px; padding: 0px; text-align: left;"><br /></span></div>
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<span style="background-color: white; border: 0px; font-family: Arimo, Arial, Helvetica, sans-serif; line-height: 22px; margin: 0px; padding: 0px; text-align: left;">Mọi thắc mắc các bạn liên hệ mình qua địa chỉ Gmail : </span></div>
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<span style="background-color: white; border: 0px; font-family: Arimo, Arial, Helvetica, sans-serif; line-height: 22px; margin: 0px; padding: 0px; text-align: left;">svk10acntt@gmail.com hoặc Fb: </span><a href="https://www.facebook.com/pham.tienphong.37" style="-webkit-transition: all 0.2s linear; background-color: white; border: 0px; font-family: Arimo, Arial, Helvetica, sans-serif; line-height: 22px; margin: 0px; padding: 0px; text-align: left; text-decoration: none; transition: all 0.2s linear;">John Ly Phạm</a></div>
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Bài 13 check box in android -2

Blog chia sẻ kinh nghiệm lập trình Android Chào các bạn hôm nay mình sẽ hướng dẫn các bạn cách bắt sự kiện ngay sau khi tick vào checkbox ...

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Bài 12 check box in android -1

<br />
Blog chia sẻ kinh nghiệm lập trình Android<br />
<div>
<br /></div>
<div>
Chào các bạn, hôm nay mình sẽ chia sẻ cho các bạn việc sử dụng check box trong android. </div>
<div>
Check box là những ô mà bạn có thể đánh dấu tích hay bỏ dấu tích để chọn hay bỏ chọn một mục nào đó mà bạn muốn. về công dụng của checkbox chắc không cần bàn nhiều , giờ chúng ta tập trung sử dụng chúng nhé :</div>
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  Như những bài trước bạn tạo 1 project với tên bạn muốn đặt, tại main_activity.xml bạn thêm các check box như sau : (dùng với linearlayout các layout khác tương tự nhé).</div>
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<blockquote class="tr_bq">
Thêm đoạn code đó vào các bạn sẽ thấy hiện lên 1 check box.  </blockquote>
<blockquote class="tr_bq">
<CheckBox</blockquote>
<blockquote class="tr_bq">
        android:id="@+id/checkbox1"</blockquote>
<blockquote class="tr_bq">
        android:layout_width="wrap_content"</blockquote>
<blockquote class="tr_bq">
        android:layout_height="wrap_content"</blockquote>
<blockquote class="tr_bq">
        android:textColor="#FFFFFF"</blockquote>
<blockquote class="tr_bq">
        android:text="textcheckbox " /></blockquote>
Các bạn tạo một giao diện như sau :<br />
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ĐÂY là Code :<br />
<br />
<b><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"</b><br />
<b>    android:layout_width="fill_parent"</b><br />
<b>    android:layout_height="fill_parent"</b><br />
<b>    android:background="#000FFF"</b><br />
<b>    android:orientation="vertical" ></b><br />
<b><br /></b>
<b>    <TextView</b><br />
<b>        android:id="@+id/textView1"</b><br />
<b>        android:layout_width="fill_parent"</b><br />
<b>        android:layout_height="wrap_content"</b><br />
<b>        android:textColor="#FFFFFF"</b><br />
<b>        android:textSize="25dp"</b><br />
<b>        android:gravity="center"</b><br />
<b>        android:text="Demo Check box in android" /></b><br />
<b><LinearLayout</b><br />
<b>    android:layout_marginTop="20dp"</b><br />
<b>   <span class="Apple-tab-span" style="white-space: pre;">  </span> android:layout_width="fill_parent"</b><br />
<b>        android:layout_height="wrap_content"</b><br />
<b>        android:background="#FF45FF"</b><br />
<b>        android:orientation="vertical" ></b><br />
<b>    <TextView</b><br />
<b>        android:id="@+id/textView2"</b><br />
<b>        android:layout_width="fill_parent"</b><br />
<b>        android:layout_height="wrap_content"</b><br />
<b>        android:gravity="center"</b><br />
<b>        android:textSize="20dp"</b><br />
<b>        android:background="#ffffff"</b><br />
<b>        android:text="Món ăn mà bạn thích" /></b><br />
<b><br /></b>
<b>    <CheckBox</b><br />
<b>        android:id="@+id/cbthitga"</b><br />
<b>        android:layout_width="wrap_content"</b><br />
<b>        android:layout_height="wrap_content"</b><br />
<b>        android:textColor="#FFFFFF"</b><br />
<b>        android:text="thịt gà " /></b><br />
<b><br /></b>
<b>    <CheckBox</b><br />
<b>        android:id="@+id/cblonquay"</b><br />
<b>        android:layout_width="wrap_content"</b><br />
<b>        android:layout_height="wrap_content"</b><br />
<b>        android:textColor="#FFFFFF"</b><br />
<b>        android:text="thịt lợn quay" /></b><br />
<b><br /></b>
<b>    <CheckBox</b><br />
<b>        android:id="@+id/cbthitbo"</b><br />
<b>        android:layout_width="wrap_content"</b><br />
<b>        android:layout_height="wrap_content"</b><br />
<b>        android:textColor="#FFFFFF"</b><br />
<b>        android:text="thịt bò" /></b><br />
<b><br /></b>
<b>    <CheckBox</b><br />
<b>        android:id="@+id/cbcalau"</b><br />
<b>        android:layout_width="wrap_content"</b><br />
<b>        android:layout_height="wrap_content"</b><br />
<b>        android:textColor="#FFFFFF"</b><br />
<b>        android:text="cá lấu" /></b><br />
<b><LinearLayout</b><br />
<b>    android:layout_width="match_parent"</b><br />
<b>        android:layout_height="wrap_content"</b><br />
<b>        android:orientation="horizontal"</b><br />
<b>        android:background="#008899"</b><br />
<b>        android:weightSum="20"</b><br />
<b>        ></b><br />
<b>    <CheckBox</b><br />
<b>        android:id="@+id/cball"</b><br />
<b>        android:layout_width="match_parent"</b><br />
<b>        android:textColor="#FFFFFF"</b><br />
<b>        android:layout_height="wrap_content"</b><br />
<b>        android:layout_weight="10"</b><br />
<b>        android:gravity="center"</b><br />
<b>        android:text="chọn hết" /></b><br />
<b><br /></b>
<b>    <CheckBox</b><br />
<b>        android:id="@+id/cbdisall"</b><br />
<b>        android:layout_width="match_parent"</b><br />
<b>        android:textColor="#FFFFFF"</b><br />
<b>        android:layout_height="wrap_content"</b><br />
<b>        android:layout_weight="10"</b><br />
<b>        android:gravity="center"</b><br />
<b>        android:text="bỏ chọn hết" /></b><br />
<b>    </LinearLayout></b><br />
<b>    </LinearLayout></b><br />
<b><LinearLayout</b><br />
<b>    android:layout_marginTop="20dp"</b><br />
<b>        android:layout_width="match_parent"</b><br />
<b>        android:layout_height="wrap_content"</b><br />
<b>        android:orientation="horizontal"</b><br />
<b>        ></b><br />
<b>    <Button</b><br />
<b>        android:id="@+id/btok"</b><br />
<b>        android:layout_width="match_parent"</b><br />
<b>        android:layout_height="wrap_content"</b><br />
<b>        android:layout_weight="10"</b><br />
<b>        android:text="ok" /></b><br />
<b><br /></b>
<b>    <Button</b><br />
<b>        android:id="@+id/btexit"</b><br />
<b>        android:layout_width="match_parent"</b><br />
<b>        android:layout_height="wrap_content"</b><br />
<b>         android:layout_weight="10"</b><br />
<b>        android:text="exit" /></b><br />
<b>  </LinearLayout></b><br />
<b></LinearLayout></b><br />
<br />
Vậy là đã xong phần tạo giao diện, bây giờ chúng ta sử dụng các checkbox vừa tạo.<br />
<br />
Khai báo id trong min.class<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEic3cBQS1AkLfCXXD_Kpcd-1AZc7GJzpLg5TnghpvjtUuzzr0h11x135NOiQLpeqXq0uvnpOdbxtfxdLh0rfp2fSlkEStDIHhpBEcEh67EyaYU9afpaTeWpfXL2uM78iLvpfrRZK8pCGT8/s1600/Capture2.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEic3cBQS1AkLfCXXD_Kpcd-1AZc7GJzpLg5TnghpvjtUuzzr0h11x135NOiQLpeqXq0uvnpOdbxtfxdLh0rfp2fSlkEStDIHhpBEcEh67EyaYU9afpaTeWpfXL2uM78iLvpfrRZK8pCGT8/s1600/Capture2.PNG" /></a></div>
<br />
<br />
Tiếp theo các bạn tạo phương thức cho sự kiện click button ok để sử lí check box.<br />
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<br /></div>
<div>
<br /></div>
<div>
<br />
<span class="Apple-tab-span" style="white-space: pre;"> </span></div>
<br />
Code </div>
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<div style="margin: 5px 20px 20px;">
<pre class="alt2" dir="ltr" style="border: 1px inset; height: 200px; margin: 0px; overflow: auto; padding: 6px; text-align: left; width: 640px;">package com.example.demo_chekbox;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;

public class MainActivity extends Activity {
    CheckBox cbga,cblon,cbbo,cbca,cball,cbdisall;
    Button btok, btexit;
    String text;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  // khai báo Id
  cball=(CheckBox)findViewById(R.id.cball);
  cbbo=(CheckBox)findViewById(R.id.cbthitbo);
  cbca=(CheckBox)findViewById(R.id.cbcalau);
  cblon=(CheckBox)findViewById(R.id.cblonquay);
  cbdisall=(CheckBox)findViewById(R.id.cbdisall);
  cbga=(CheckBox)findViewById(R.id.cbthitga);
  
  btexit=(Button)findViewById(R.id.btexit);
  btok=(Button)findViewById(R.id.btok);
  
  // gọi phương thức
  setCball();
  setCbdisall();
  setBtok();
 }//oncreate
 
 public  void setCball()
 {
   if(cball.isChecked())
   {
    cbbo.setChecked(true);
    cbca.setChecked(true);
    cbga.setChecked(true);
    cbbo.setChecked(true);
    cblon.setChecked(true);
    cbdisall.setChecked(false);
   
   }
  
 }
 
 public void setCbdisall()
 {

if(cbdisall.isChecked())
   {
    cbbo.setChecked(false);
    cbca.setChecked(false);
    cbga.setChecked(false);
    cbbo.setChecked(false);
    cblon.setChecked(false);
    cball.setChecked(false);
   
   }
 }
 
 public void setBtok() {
  btok.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View arg0) {
    setCball();
    setCbdisall();
   }
  });
 }

}</pre>
</div>
Chạy ứng dụng và các bạn xem kết quả. ở bài viết này chỉ nêu ra cách dùng chekbox dơn giản nhất.<br />
Bài Viết sau mình sẽ hướng dẫn các bạn up date lại thông tin ngay sau khi nhấn ticks hay bỏ tích trên checkboxx<br />
<span style="background-color: #f3ffee; border: 0px; color: #222222; font-family: Georgia, Utopia, 'Palatino Linotype', Palatino, serif; line-height: 21px; margin: 0px; padding: 0px;">Mọi thắc mắc các bạn liên hệ mình qua địa chỉ Gmail : svk10acntt@gmail.com hoặc Fb: </span><a href="https://www.facebook.com/pham.tienphong.37" style="-webkit-transition: all 0.2s linear; background-color: #f3ffee; border: 0px; color: #009935; font-family: Georgia, Utopia, 'Palatino Linotype', Palatino, serif; line-height: 21px; margin: 0px; padding: 0px; text-decoration: none; transition: all 0.2s linear;">https://www.facebook.com/pham.tienphong.37</a><br />
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<br /></div>

Bài 12 check box in android -1

Blog chia sẻ kinh nghiệm lập trình Android Chào các bạn, hôm nay mình sẽ chia sẻ cho các bạn việc sử dụng check box trong android. C...

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Bài 11 - Ứng dụng tính tổng trên android

<br />
Blog chia sẻ kinh nghiệm lập trình Android<br />
<br />
Xuyên suốt quá trình học cơ bản từ hôm  đầu tới giờ, hôm nay mình sẽ demo cho các bạn bài tính tổng hai số nguyên.<br />
 Đầu tiên các bạn tạo project có tên là SumAndroidDemo<br />
<br />
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<div class="separator" style="clear: both; text-align: center;">
<br /></div>
<div class="separator" style="clear: both; text-align: left;">
<br /></div>
 Sau đó các bạn tạo giao diện như sau :<br />
<br />
<br />
<div class="separator" style="clear: both; text-align: center;">
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<div class="separator" style="clear: both; text-align: center;">
<br /></div>
<blockquote class="tr_bq">
Code : </blockquote>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"<br />
    android:layout_width="fill_parent"<br />
    android:layout_height="fill_parent"<br />
    android:background="#FFFF34"<br />
    android:orientation="vertical" ><br />
<br />
    <TextView<br />
        android:id="@+id/textView1"<br />
        android:layout_width="fill_parent"<br />
        android:layout_height="wrap_content"<br />
        android:gravity="center"<br />
        android:text="Demo tính tổng "<br />
        android:textSize="25dp" /><br />
<br />
    <LinearLayout<br />
        android:id="@+id/linnerlayout"<br />
        android:layout_width="fill_parent"<br />
        android:layout_height="wrap_content"<br />
        android:layout_marginTop="50dp"<br />
        android:orientation="horizontal" ><br />
<br />
        <TextView<br />
            android:id="@+id/textView2"<br />
            android:layout_width="match_parent"<br />
            android:layout_height="wrap_content"<br />
            android:layout_weight="70"<br />
            android:text="Nhập số A  = " /><br />
<br />
        <EditText<br />
            android:id="@+id/edta"<br />
            android:layout_width="match_parent"<br />
            android:layout_height="wrap_content"<br />
            android:layout_weight="30"<br />
            android:background="#FFFFF8"<br />
            android:ems="10" ><br />
<br />
            <requestFocus /><br />
        </EditText><br />
    </LinearLayout><br />
 <LinearLayout<br />
        android:id="@+id/linnerlayout"<br />
        android:layout_width="fill_parent"<br />
        android:layout_height="wrap_content"<br />
        android:layout_marginTop="20dp"<br />
        android:orientation="horizontal" ><br />
<br />
        <TextView<br />
            android:id="@+id/textView2"<br />
            android:layout_width="match_parent"<br />
            android:layout_height="wrap_content"<br />
            android:layout_weight="70"<br />
            android:text="Nhập số B = " /><br />
<br />
        <EditText<br />
            android:id="@+id/edtb"<br />
            android:layout_width="match_parent"<br />
            android:layout_height="wrap_content"<br />
            android:layout_weight="30"<br />
            android:background="#FFFFF8"<br />
            android:ems="10" ><br />
<br />
            <requestFocus /><br />
        </EditText><br />
    </LinearLayout><br />
    <TextView<br />
        android:id="@+id/tvSum"<br />
        android:background="#FFFFF3"<br />
        android:layout_marginTop="40dp"<br />
        android:layout_width="fill_parent"<br />
        android:layout_height="wrap_content"<br />
        android:text="Tổng hai số vừa nhập là : " /><br />
<br />
    <LinearLayout<br />
        android:id="@+id/linnearlayout3"<br />
        android:layout_width="fill_parent"<br />
        android:layout_height="wrap_content"<br />
        android:layout_marginTop="30dp"<br />
        android:background="#0033FF"<br />
        android:orientation="horizontal" ><br />
<br />
        <Button<br />
            android:id="@+id/btsum"<br />
            android:layout_width="match_parent"<br />
            android:layout_height="wrap_content"<br />
            android:layout_weight="10"<br />
            android:text="Cộng" /><br />
  <Button<br />
            android:id="@+id/btclear"<br />
            android:layout_width="match_parent"<br />
            android:layout_height="wrap_content"<br />
            android:layout_weight="10"<br />
            android:text="Xóa" /><br />
        <Button<br />
            android:id="@+id/btexit"<br />
            android:layout_width="match_parent"<br />
            android:layout_height="wrap_content"<br />
            android:layout_weight="10"<br />
            android:text="Exit" /><br />
    </LinearLayout><br />
<br />
</LinearLayout><br />
<br />
 _______________________________________<br />
<br />
<br />
Các bạn chú ý các ID edta,edtb,btsum,btclear,btexit,tvsum.<br />
<br />
Sau đó các bạn kết nối các id trong file.xml với main class.<br />
<br />
Code :<br />
<br />
<br />
Chạy ứng dụng và thưởng thức : các bạn nghiên cứu code và tìm hiểu thêm có những chi tiết nhỏ rất hay.<br />
<br />
<br />
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chúc các bạn thành công.</div>
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<b><span style="background-color: white; border: 0px; font-family: Arimo, Arial, Helvetica, sans-serif; line-height: 22px; margin: 0px; padding: 0px;">Mọi thắc mắc các bạn liên hệ mình qua địa chỉ Gmail : svk10acntt@gmail.com hoặc Fb: </span><a href="https://www.facebook.com/pham.tienphong.37" style="background-color: white; border: 0px; font-family: Arimo, Arial, Helvetica, sans-serif; line-height: 22px; margin: 0px; padding: 0px; text-decoration: none;">John Ly Phạm</a></b></div>
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<pre class="alt2" dir="ltr" style="border: 1px inset; height: 200px; margin: 0px; overflow: auto; padding: 6px; text-align: left; width: 640px;">package com.example.sumandroiddemo;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
   EditText edta,edtb;
   TextView tvSum;
   Button btSum,btClear,btExit;
   Context context = this;
   int a,b,sum;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  // kết nối id xml với class
  edta =(EditText)findViewById(R.id.edta);
  edtb =(EditText)findViewById(R.id.edtb);
  btClear =(Button)findViewById(R.id.btclear);
  btExit =(Button)findViewById(R.id.btexit);
  btSum = (Button)findViewById(R.id.btsum);
  tvSum=(TextView)findViewById(R.id.tvSum);
  
  // gọi các hàm
  Tinh_tong();
  clear_data();
  exit_app();
  
 }

private void exit_app() {
  // TODO Auto-generated method stub
  btExit.setOnClickListener(new OnClickListener() {
   
   @Override
   public void onClick(View v) {
    // TODO Auto-generated method stub
    AlertDialog.Builder b = new  AlertDialog.Builder(context);
    b.setTitle("Thoát");
    b.setMessage("thoát ứng dụng");
    b.setNegativeButton("No", null);
    b.setNeutralButton("Yes", new DialogInterface.OnClickListener() {
     
     @Override
     public void onClick(DialogInterface arg0, int arg1) {
      // TODO Auto-generated method stub
      System.exit(0);
     }
    });
    b.show();
   }
  });
 }

public void Tinh_tong()
 {
  btSum.setOnClickListener(new OnClickListener() {
   
   @Override
   public void onClick(View v) {
    // kiểm tra nhập số liệu có đúng kiểu nguyên không
    try {
     a =Integer.parseInt(edta.getText()+"");
    } catch (Exception e) {
     edta.setText("");
     edta.requestFocus();
     Toast.makeText(getApplication(), "Nhập số tự nhiên", 1).show();
     return;
    }
    
    try {
     b=Integer.parseInt(edtb.getText()+"");
    } catch (Exception e) {
     edtb.setText("");
     edtb.requestFocus();
     Toast.makeText(getApplication(), "Nhập số tự nhiên", 1).show();
     return;
    }
    // bắt đầu tính toán
   // tổng hai số
    sum = a+b;
   //hiện thị tổng
    tvSum.setText(tvSum.getText().toString()+sum);
    
    
   }
  });
 }
 public void clear_data()
 {
  btClear.setOnClickListener(new OnClickListener() {
   
   @Override
   public void onClick(View v) {
    edta.setText("");
    edtb.setText("");
    a=b=sum=0;
    tvSum.setText("Tổng hai số vừa nhập là : ");
   }
  });
 }
}

</pre>
</div>

Bài 11 - Ứng dụng tính tổng trên android

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