RadioGroup(单选框)

public class MainActivity extends ActionBarActivity implements OnCheckedChangeListener{
	RadioGroup rp;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		rp=(RadioGroup) findViewById(R.id.radioGroup1);
		rp.setOnCheckedChangeListener(this);
	}
	
	@Override
	public void onCheckedChanged(RadioGroup arg0, int CheckedId) {
		// TODO Auto-generated method stub
		switch(CheckedId)
		{
		case R.id.radio0:
			Toast.makeText(this, "你是男孩", Toast.LENGTH_SHORT).show();
			break;
		case R.id.radio1:
			Toast.makeText(this, "你是女孩", Toast.LENGTH_SHORT).show();
			break;
		}
		
	}


}记得别导包android.widget.RadioGroup.OnCheckedChangeListener

<pre name="code" class="html"><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.xin.radiogroup.MainActivity" >

    <RadioGroup
        android:id="@+id/radioGroup1"
        android:orientation="horizontal"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="14dp" >

        <RadioButton
            android:id="@+id/radio0"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:checked="true"
            android:text="男" />

        <RadioButton
            android:id="@+id/radio1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="女" />
    </RadioGroup>

</RelativeLayout>