Android单选按钮RadioButton的使用详解

<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"
  android:paddingBottom="@dimen/activity_vertical_margin"
  android:paddingLeft="@dimen/activity_horizontal_margin"
  android:paddingRight="@dimen/activity_horizontal_margin"
  android:paddingTop="@dimen/activity_vertical_margin"
  tools:context=".MainActivity" >
  <TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    android:layout_marginTop="44dp"
    android:text="性别："
    android:textSize="20dp" />
  <RadioGroup
    android:id="@+id/radioGroup1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignTop="@+id/textView1"
    android:layout_marginLeft="21dp"
    android:layout_toRightOf="@+id/textView1"
    android:orientation="horizontal" >
    <RadioButton
      android:id="@+id/radio0"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:checked="true"
      android:onClick="onRadioButtonClicked"
      android:text="男" />
    <RadioButton
      android:id="@+id/radio1"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:onClick="onRadioButtonClicked"
      android:text="女" />
    <RadioButton
      android:id="@+id/radio2"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:onClick="onRadioButtonClicked"
      android:text="保密" />
  </RadioGroup>
</RelativeLayout>

package com.lc.radiobutton;
import com.example.radiobutton.R;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.RadioButton;
import android.widget.Toast;
public class MainActivity extends Activity {
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 }
 /*
 * 设置radio的点击事件，当点击的时候显示文字
 */
 public void onRadioButtonClicked(View view) {
 RadioButton button = (RadioButton) view;
 boolean isChecked = button.isChecked();
 switch (view.getId()) {
 case R.id.radio0:
  if (isChecked) {
  Toast.makeText(MainActivity.this, button.getText(), 1).show();
  }
  break;
 case R.id.radio1:
  if (isChecked) {
  Toast.makeText(MainActivity.this, button.getText(), 1).show();
  }
  break;
 case R.id.radio2:
  if (isChecked) {
  Toast.makeText(MainActivity.this, button.getText(), 1).show();
  }
  break;
 default:
  break;
 }
 }
 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
 // Inflate the menu; this adds items to the action bar if it is present.
 getMenuInflater().inflate(R.menu.main, menu);
 return true;
 }
}