RadioGroup和RadioButton(单选框)

1.布局文件

<LinearLayout 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:orientation="vertical"
    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" >

    <RadioGroup
        android:id="@+id/radioGroup1"
        android:layout_width="wrap_content"
        android:orientation="horizontal"
        android:layout_height="wrap_content" >

        <RadioButton
            android:id="@+id/radio0"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:checked="true"
            android:text="男" />

        <RadioButton
            android:id="@+id/radio1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="女" />

    </RadioGroup>

</LinearLayout>

2.绑定事件(实现接口，注意导包)

package com.example.test2;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;

public class MainActivity extends Activity implements OnCheckedChangeListener {

    private Button login_button;
    private Button reset;
    private RadioGroup rg;
    private Button other;
    private CheckBox checkBox1;
    private Button myButton;

    /*
     * @Override protected void onCreate(Bundle savedInstanceState) {
     * super.onCreate(savedInstanceState);
     * setContentView(R.layout.activity_radiobutton);
     * 
     * login_button = (Button) this.findViewById(R.id.loginButton); checkBox1 =
     * (CheckBox) findViewById(R.id.checkBox1);
     * checkBox1.setOnCheckedChangeListener(new OnCheckedChangeListener() {
     * 
     * @Override public void onCheckedChanged(CompoundButton arg0, boolean arg1)
     * { // arg1代表是否选中 Log.i("tag", arg1 + ""); if (arg1) { Log.i("tag",
     * checkBox1.getText().toString()); }
     * 
     * } }); }
     */

    // 单选框
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_radiobutton);

        rg = (RadioGroup) this.findViewById(R.id.radioGroup1);
        rg.setOnCheckedChangeListener(this);
    }

    @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;
    }

    @Override
    public void onCheckedChanged(RadioGroup arg0, int checkId) {
        // TODO Auto-generated method stub
        switch(checkId){
        case R.id.radio0:
            Log.i("tag", "当前选中男");
            break ;
        case R.id.radio1:
            Log.i("tag", "当前选中女");
            break ;
        default:
            break ;
        }
    }

}

3.效果: