package com.lxt008;import com.lxt008.R;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{    /**     * 创建TextView对象     * 创建RadioGroup对象     * 创建4个RadioButton对象     */    TextView        m_TextView;    RadioGroup        m_RadioGroup;    RadioButton        m_Radio1, m_Radio2, m_Radio3, m_Radio4;    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState)    {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        /**         * 获得TextView对象         * 获得RadioGroup对象         * 获得4个RadioButton对象         */        m_TextView = (TextView) findViewById(R.id.TextView01);        m_RadioGroup = (RadioGroup) findViewById(R.id.RadioGroup01);        m_Radio1 = (RadioButton) findViewById(R.id.RadioButton1);        m_Radio2 = (RadioButton) findViewById(R.id.RadioButton2);        m_Radio3 = (RadioButton) findViewById(R.id.RadioButton3);        m_Radio4 = (RadioButton) findViewById(R.id.RadioButton4);        /* 设置事件监听  */        m_RadioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {            @Override            public void onCheckedChanged(RadioGroup group, int checkedId)            {                // TODO Auto-generated method stub                if (checkedId == m_Radio2.getId())                {                    DisplayToast("正确答案：" + m_Radio2.getText() + "，恭喜你，回答正确！");                }                else                {                    DisplayToast("请注意，回答错误！");                }            }        });    }        /* 显示Toast  */    public void DisplayToast(String str)    {        Toast toast = Toast.makeText(this, str, Toast.LENGTH_LONG);        //设置toast显示的位置        toast.setGravity(Gravity.TOP, 0, 220);        //显示该Toast        toast.show();    }}

<?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/TextView01"    android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="@string/hello"    />  <RadioGroup    android:id="@+id/RadioGroup01"    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/RadioButton1"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:text="@string/RadioButton1"    />    <RadioButton      android:id="@+id/RadioButton2"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:text="@string/RadioButton2"    />    <RadioButton      android:id="@+id/RadioButton3"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:text="@string/RadioButton3"    />    <RadioButton      android:id="@+id/RadioButton4"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:text="@string/RadioButton4"    />    </RadioGroup>    </LinearLayout>