Android控件之-RadioGroup和RadioButton

单项选择的组件一般情况是有RadioGroup和RadiaButton组成的

package com.ko8e;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 Activity01 extends Activity {    /** Called when the activity is first created. */private TextView textView = null;private RadioButton button1 = null;private RadioButton button2 = null;private RadioButton button3 = null;private RadioButton button4 = null;private RadioGroup group = null;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        textView = (TextView) findViewById(R.id.button1);        button1 = (RadioButton) findViewById(R.id.button1);        button2 = (RadioButton) findViewById(R.id.button2);        button3 = (RadioButton) findViewById(R.id.button3);        button4 = (RadioButton) findViewById(R.id.button4);        group = (RadioGroup) findViewById(R.id.group);       group.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {public void onCheckedChanged(RadioGroup group, int checkedId) {if(checkedId == button3.getId()) {DisplayToast("回答正确！" + button3.getText().toString());} else {DisplayToast("回答错误，请重新选择");}}});    }    public void DisplayToast(String str) {    Toast toast = Toast.makeText(this, str, Toast.LENGTH_SHORT);    toast.setGravity(Gravity.TOP, 0, 200);    toast.show();    }}

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layout.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    ><TextView  android:id="@+id/view"    android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="@string/question"    /><RadioGroupandroid:id="@+id/group"android:layout_width="fill_parent"android:layout_height="wrap_content"android:orientation="vertical"android:layout_x="3px"android:layout_y="54px"/><RadioButtonandroid:id="@+id/button1"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="@string/button1"/><RadioButtonandroid:id="@+id/button2"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="@string/button2"/><RadioButtonandroid:id="@+id/button3"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="@string/button3"/><RadioButtonandroid:id="@+id/button4"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="@string/button4"/></LinearLayout>