Android 控件之六：RadioGroup and RadioButton 单选组和单选钮

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import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.RadioButton;import android.widget.Toast;public class MainHelloRadioGroup extends Activity {/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);final RadioButton radio_red = (RadioButton) findViewById(R.id.radio_red);final RadioButton radio_blue = (RadioButton) findViewById(R.id.radio_blue);OnClickListener ocl = new OnClickListener() {@Overridepublic void onClick(View v) {Toast.makeText(MainHelloRadioGroup.this,((RadioButton) v).getText(), Toast.LENGTH_SHORT).show();}};radio_red.setOnClickListener(ocl);radio_blue.setOnClickListener(ocl);}}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/androidd"    android:layout_width="ffill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <RadioGroup        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:orientation="vertical" >        <RadioButton            android:id="@+id/radio_red"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="红" />        <RadioButton            android:id="@+id/radio_blue"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="蓝" />    </RadioGroup></LinearLayout>

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