PopupWindow弹窗事件

package com.example.popup;

import android.app.Activity;
import android.graphics.Color;
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.TextView;

public class MainActivity extends Activity {
Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button=(Button) findViewById(R.id.button1);
button.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
LayoutInflater inflater=MainActivity.this.getLayoutInflater();
View view=inflater.inflate(R.layout.mmmm, null);
view.setBackgroundColor(Color.BLUE);

TextView textview=(TextView) view.findViewById(R.id.textView1);
textview.setText("holloWord");

PopupWindow popupwindow=new PopupWindow(view,400,200);
//popupwindow.showAsDropDown(button);
//下面是点击屏幕空白处 推出弹屏
popupwindow.setBackgroundDrawable(getResources().getDrawable(android.R.drawable.alert_dark_frame));
popupwindow.setOutsideTouchable(true);
popupwindow.showAtLocation(MainActivity.this.getWindow().getDecorView(), Gravity.CENTER, 0, 0);

}
});

}

}

布局文件：

<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"
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="com.example.popup.MainActivity" >

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="160dp"
android:text="Button" />

</RelativeLayout>


布局：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />

<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_launcher" />

</LinearLayout>