控件：PopupWindow 弹出窗口（基本操作）

popwindow.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">
    <TextView
        android:id="@+id/popinfo"
        android:text="请选择您的当前状态："    
        android:layout_width="wrap_content"
        android:textSize="20px"
        android:layout_height="wrap_content"/>
    <RadioGroup
        android:id="@+id/changestatus"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:checkedButton="@+id/online">
        <RadioButton
            android:id="@+id/online"
            android:text="在线"/>
        <RadioButton
            android:id="@+id/offline"
            android:text="离线"/>
        <RadioButton
            android:id="@+id/stealth"
            android:text="隐身"/>
    </RadioGroup>
    <Button 
        android:id="@+id/cancel" 
        android:layout_height="wrap_content"
        android:layout_width="wrap_content" 
        android:text="取消" />
</LinearLayout>

main.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/statusinfo"
        android:layout_height="wrap_content"
        android:layout_width="fill_parent" 
        android:text="当前用户状态：在线" />
    <Button 
        android:id="@+id/popbut" 
        android:layout_height="wrap_content"
        android:layout_width="fill_parent"
        android:text="状态" /> 
</LinearLayout>

MyPopupWindowDemo.java

import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.PopupWindow;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TextView;

public class MyPopupWindowDemo extends Activity {

    private Button popbut = null;                 // 按钮组件
    private RadioGroup changestatus = null;     // 单选钮组件
    private TextView statusinfo = null;         // 文本显示组件
    private Button cancel = null;                 // 按钮组件
    private PopupWindow popWin = null;             // 弹出窗口
    private View popView = null;                 // 保存弹出窗口布局

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // 设置布局管理器
        super.setContentView(R.layout.main);             
        // 取得组件
        this.popbut = (Button) super.findViewById(R.id.popbut); 
        // 取得组件
        this.statusinfo = (TextView) super.findViewById(R.id.statusinfo); 
        // 设置单击事件
        this.popbut.setOnClickListener(new OnClickListenerImpl()); 
    }
    
    // 设置监听
    private class OnClickListenerImpl implements OnClickListener {    
        @Override
        public void onClick(View view) {
            // 取得LayoutInflater对象
            LayoutInflater inflater = LayoutInflater.from(MyPopupWindowDemo.this);    
            // 读取布局管理器
            MyPopupWindowDemo.this.popView = inflater.inflate(R.layout.popwindow, null);
            // 实例化PopupWindow
            MyPopupWindowDemo.this.popWin = new PopupWindow(popView, 300, 220,true);
            // 取得组件
            MyPopupWindowDemo.this.changestatus = (RadioGroup) popView.findViewById(R.id.changestatus); 
            // 取得组件
            MyPopupWindowDemo.this.cancel = (Button) popView.findViewById(R.id.cancel); 
            // 设置监听
            MyPopupWindowDemo.this.changestatus.setOnCheckedChangeListener(
                    new OnCheckedChangeListenerImpl());    
            MyPopupWindowDemo.this.cancel
                    .setOnClickListener(new OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            // 关闭弹出窗口
                            MyPopupWindowDemo.this.popWin.dismiss(); 
                        }
                    });
            // 显示弹出窗口
            MyPopupWindowDemo.this.popWin.showAtLocation(
                    MyPopupWindowDemo.this.popbut, 
                    Gravity.CENTER, 0, 0);                    
        }
    }
    
    // 选项选中时触发
    private class OnCheckedChangeListenerImpl implementsOnCheckedChangeListener {                        

        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {
            // 取得选中组件
            RadioButton but = (RadioButton) MyPopupWindowDemo.this.popView
                    .findViewById(group.getCheckedRadioButtonId());    
            // 设置文本
            MyPopupWindowDemo.this.statusinfo.setText("当前用户状态："
                    + but.getText().toString());    
            // 关闭弹出窗口
            MyPopupWindowDemo.this.popWin.dismiss();         
        }

    }
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="org.lxh.demo"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="3" />

    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".MyPopupWindowDemo"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>
</manifest>