Android(安卓)RadioGroup和RadioButton使用

RadioGroup管理一组RadioButton，其中的RadioButton只能做出单一选择。

效果如：

先给出整个Activity的布局文件main.xml：

xml version="1.0" encoding="UTF-8"?><<>LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical"> <<>TextView android:id="@+id/radiobutton_textview" android:layout_width="fill_parent" android:layout_height="50dip" android:textSize="18dip" android:textStyle="bold" android:background="@android:drawable/title_bar" android:textAppearance="?android:attr/textAppearanceLarge" android:gravity="center_vertical" /> <<>RadioGroup android:id="@+id/group" android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="vertical"> <<>RadioButton android:id="@+id/button1" android:layout_width="fill_parent" android:layout_height="50dip" android:textSize="20dip" android:paddingLeft="30dip" android:text="Android新手" android:button="@null" android:drawableRight="@android:drawable/btn_radio"/> <<>View android:layout_width="fill_parent" android:layout_height="1px" android:background="?android:attr/listDivider" /> <<>RadioButton android:id="@+id/button2" android:layout_width="fill_parent" android:layout_height="50dip" android:textSize="20dip" android:paddingLeft="30dip" android:text="Android高手" android:button="@null" android:drawableRight="@android:drawable/btn_radio"/> RadioGroup> LinearLayout>

RadioButton 默认按钮在文本的左边，我放到右边，涉及代码：android:button="@null"，将左侧的按钮消除；

android:drawableRight="@android:drawable/btn_radio"，在文本右侧添加按钮。

MainActivity主要介绍单选按钮组监听事件：OnCheckedChangeListener

   1:  /**

   2:   * @

   3:   * @author ahutzh

   4:   * @data 2011-4-14

   5:   */

   6:  public class MainActivity extends Activity {

7:

   8:      private TextView textView;

   9:      private RadioGroup group;

10:

  11:      /** Called when the activity is first created. */

  12:      @Override

  13:      public void onCreate(Bundle savedInstanceState) {

  14:          super.onCreate(savedInstanceState);

  15:          setContentView(R.layout.main);

16:

  17:          textView = (TextView) findViewById(R.id.radiobutton_textview);

  18:          group = (RadioGroup) findViewById(R.id.group);

19:

  20:          // 单选按钮组监听事件

  21:          group.setOnCheckedChangeListener(new OnCheckedChangeListener() {

22:

  23:              @Override

  24:              public void onCheckedChanged(RadioGroup group, int checkedId) {

  25:                  // 根据ID判断选择的按钮

  26:                  if (checkedId == R.id.button1) {

  27:                      textView.setText("Android新手");

  28:                  } else {

  29:                      textView.setText("Android高手");

  30:                  }

  31:              }

  32:          });

  33:      }

  34:  }

RadioGroup注册监听事件OnCheckedChangeListener()，在onCheckedChanged实现业务逻辑。

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