MainActivity如下:

package com.cn.testpopupwindow;
import android.app.Activity;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.PopupWindow;
public class MainActivity extends Activity {
    private Button button;
    private Button button1;
    private Button button2;
    private Button button3;
    private Button button4;
    private View popupWindowView;
    private PopupWindow popupWindow;
    private LayoutInflater inflater;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        button=(Button) findViewById(R.id.button);
        button.setOnClickListener(new ButtonOnClickListener());
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    private class ButtonOnClickListener implements OnClickListener{
		public void onClick(View v) {
			inflater=(LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
			popupWindowView=inflater.inflate(R.layout.popupwindow, null);
		
			popupWindow=new PopupWindow(popupWindowView, LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT,true);
			//必须要有这句否则弹出popupWindow后监听不到Back键
			popupWindow.setBackgroundDrawable(new BitmapDrawable());
			popupWindow.showAtLocation(findViewById(R.id.button), Gravity.NO_GRAVITY, 0, 0);
			//让popupWindow获得焦点
			popupWindow.setFocusable(true);
			//设置动画
			popupWindow.setAnimationStyle(R.style.popupWindowAnimation);
			popupWindow.update();
						
			//popupWindow中按钮的处理
			button1=(Button) popupWindowView.findViewById(R.id.button1);
			button2=(Button) popupWindowView.findViewById(R.id.button2);
			button3=(Button) popupWindowView.findViewById(R.id.button3);
			button4=(Button) popupWindowView.findViewById(R.id.button4);
			button1.setOnClickListener(new ButtonsOnClickListener());
			button2.setOnClickListener(new ButtonsOnClickListener());
			button3.setOnClickListener(new ButtonsOnClickListener());
			button4.setOnClickListener(new ButtonsOnClickListener());
			
		}
    	
    }
    
	private class ButtonsOnClickListener implements OnClickListener {
		public void onClick(View v) {
			switch (v.getId()) {
			case R.id.button1:
                System.out.println("点击了按钮1");
				break;
			case R.id.button2:
				 System.out.println("点击了按钮2");
				break;
			case R.id.button3:
				 System.out.println("点击了按钮3");
				break;
			case R.id.button4:
				 System.out.println("点击了按钮4");
				break;

			default:
				break;
			}

		}

	}
	
	//监听Back事件
	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if (keyCode==KeyEvent.KEYCODE_BACK) {
			if (popupWindow!=null&&popupWindow.isShowing()) {
				popupWindow.dismiss();		
			} else {
                MainActivity.this.finish();
			}
		}
		return super.onKeyDown(keyCode, event);
	}
}

Main.xml如下:

<RelativeLayout 
    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" >

    <Button 
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="test"
        android:layout_centerInParent="true"
    />
   
</RelativeLayout>

popupwindow.xml如下:

<?xml version="1.0" encoding="utf-8"?>
<!--注意:在RelativeLayout里面是LinearLayout,且是vertical的-->
<!--第一个Button的 layout_marginTop是相对于父控件而言的-->
<!--但是第二个Button的layout_marginTop是相对于第一个Button而言的  -->
<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#f0838b8b"
    android:orientation="vertical"
    >
    
    <LinearLayout
        android:id="@+id/linerLayout"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:orientation="vertical"
    >
        
        <Button 
            android:id="@+id/button1"
            android:layout_width="200dip"
            android:layout_height="wrap_content"
            android:text="Button1"
            android:textSize="20sp"
            android:layout_gravity="center_horizontal"
            android:layout_marginTop="20dip"
        />
         <Button 
            android:id="@+id/button2"
            android:layout_width="200dip"
            android:layout_height="wrap_content"
            android:text="Button2"
            android:textSize="20sp"
            android:layout_gravity="center_horizontal"
            android:layout_marginTop="20dip"
        />
          <Button 
            android:id="@+id/button3"
            android:layout_width="200dip"
            android:layout_height="wrap_content"
            android:text="Button3"
            android:textSize="20sp"
            android:layout_gravity="center_horizontal"
            android:layout_marginTop="20dip"
        />
           <Button 
            android:id="@+id/button4"
            android:layout_width="200dip"
            android:layout_height="wrap_content"
            android:text="Button4"
            android:textSize="20sp"
            android:layout_gravity="center_horizontal"
            android:layout_marginTop="20dip"
        />
        
        
    </LinearLayout>
    

</RelativeLayout>

style.xml如下

<resources xmlns:android="http://schemas.android.com/apk/res/android">
   <style name="AppTheme" parent="android:Theme.Light" />
   <style name="popupWindowAnimation" mce_bogus="1" parent="android:Animation">
        <item name="android:windowEnterAnimation">@anim/enter</item>
        <item name="android:windowExitAnimation">@anim/exit</item>
    </style>
</resources>

enter.xml动画如下:

<?xml version="1.0" encoding="utf-8"?>
<!-- android:fromYDelta:动画开始的点离当前View X坐标上的差值 -->
<!-- 利用100%p表示该动画在当前View的最下方 -->
<set 
    xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
        android:duration="1500"
        android:fromYDelta="100%p"
        android:interpolator="@android:anim/decelerate_interpolator"
        android:toYDelta="0" />

</set>

exit.xml动画如下:

<?xml version="1.0" encoding="utf-8"?>
<!-- Alpha=1.0表示不透明,Alpha=0.0表示透明 -->
<set 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@android:anim/decelerate_interpolator" >
    <alpha
        android:duration="1000"
        android:fromAlpha="1.0"
        android:toAlpha="0.0"
     />
</set>