activity 成popupwindow效果

<activity
android:name="cn.bw.activitys.ExitActivity"
android:theme="@style/MyDialogStyle">
</activity>

<style name="MyDialogStyle">
<item name="android:windowBackground">@android:color/transparent</item>
<item name="android:windowFrame">@null</item>
<item name="android:windowNoTitle">true</item>
<item name="android:windowIsFloating">true</item>
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowContentOverlay">@null</item>
<item name="android:windowAnimationStyle">@android:style/Animation.Dialog</item>
<item name="android:backgroundDimEnabled">true</item>
</style>

package cn.bw.activitys;

import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.LinearLayout;
import android.widget.Toast;

public class ExitActivity extends Activity {
private LinearLayout layout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.exit_dialog);
//dialog=new MyDialog(this);
layout=(LinearLayout)findViewById(R.id.exit_layout);
layout.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "提示：点击窗口外部关闭窗口！",
Toast.LENGTH_SHORT).show();
}
});
}

/*
**在按下屏幕的其他地方会消失，
*/
@Override
public boolean onTouchEvent(MotionEvent event){
finish();
return true;
}

public void exitbutton1(View v) {
this.finish();
}
public void exitbutton0(View v) {
this.finish();
MainWeixinActivity.instance.finish();//关闭Main 这个Activity
}

}

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/exit_layout"
android:layout_width="280dp"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:orientation="vertical"
android:background="@drawable/confirm_dialog_bg2" >

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="4dp"
android:padding="5dp"
android:textColor="#333"
android:textSize="20sp"
android:text="退出微信" />

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#333"
android:layout_marginTop="1dp"
android:padding="10dp"
android:textSize="16sp"
android:gravity="center_horizontal"
android:text="退出后，你将收不到新的消\n息.确定要退出？" />

<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="33dp"
android:layout_marginBottom="8dp"
>

<Button
android:id="@+id/exitBtn0"
android:layout_width="110dp"
android:layout_height="wrap_content"
android:text="是"
android:textSize="16sp"
android:textColor="#fff"
android:background="@drawable/btn_style_green"
android:gravity="center"
android:onClick="exitbutton0"
/>

<Button
android:id="@+id/exitBtn1"
android:layout_width="110dp"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:text="否"
android:textSize="16sp"
android:textColor="#333"
android:background="@drawable/btn_style_white"
android:gravity="center"
android:onClick="exitbutton1"
/>
</LinearLayout>

</LinearLayout>