Android学习笔记-RadioGroup,RadioButton

test.java

package org.ben.test;

import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;

public class AndroidTest_Radio_Group_ButtonActivity extends Activity {
	
	RadioGroup rGroup;
	RadioButton rBtn1,rBtn2,rBtn3,rBtn4;
	TextView textView;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    
        textView = (TextView)findViewById(R.id.textview);
        rGroup = (RadioGroup)findViewById(R.id.rg);
        rBtn1 = (RadioButton)findViewById(R.id.rb1);
        rBtn2 = (RadioButton)findViewById(R.id.rb2);
        rBtn3 = (RadioButton)findViewById(R.id.rb3);
        rBtn4 = (RadioButton)findViewById(R.id.rb4);
        
        
        rGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
			
			@Override
			public void onCheckedChanged(RadioGroup group, int checkedId) {
				// TODO Auto-generated method stub
				if (checkedId == rBtn2.getId())
				{
					DisplayToast("正确答案是："+ rBtn2.getText() + "，恭喜你，回答正确！");
				}
				else
				{
					DisplayToast("请注意，回答错误！");
				}
			}
		});
    }
    
    public void DisplayToast(String str)
    {
    	Toast toast = Toast.makeText(this, str, Toast.LENGTH_LONG);
    	toast.setGravity(Gravity.TOP, 0, 220);
    	toast.show();
    }
}

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/textview"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/title" />
    
    <RadioGroup
        android:id="@+id/rg"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_x="3px"
        android:layout_y="54px">
        
        <RadioButton
            android:id="@+id/rb1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/rb1"/>
        <RadioButton
            android:id="@+id/rb2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/rb2"/>
        <RadioButton
            android:id="@+id/rb3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/rb3"/>
        <RadioButton
            android:id="@+id/rb4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/rb4"/>l
        
    </RadioGroup>

</LinearLayout>