PopupWindow的简单使用

package com.zzw.testpopuwindows;

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.widget.Button;
import android.widget.PopupWindow;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final Button button = (Button) findViewById(R.id.button);

        button.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {

                LayoutInflater inflater = MainActivity.this.getLayoutInflater();
                View view = inflater.inflate(R.layout.item, null);

                PopupWindow mPopupWindow = new PopupWindow(view, 500, 300);

                //设置背景的目的是使setOutsideTouchable方法生效
                mPopupWindow.setBackgroundDrawable(getResources().getDrawable(R.drawable.ic_launcher));
                mPopupWindow.setOutsideTouchable(true);//在外点击消失
                // mPopupWindow.showAsDropDown(button);
                mPopupWindow.showAtLocation(MainActivity.this.getWindow().getDecorView(), Gravity.CENTER, 0, 0);
            }
        });
    }

}

<?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:background="@android:color/darker_gray"
    android:orientation="vertical" >

    <ImageView
        android:layout_gravity="center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_launcher" />

    <TextView
        android:layout_gravity="center"
        android:gravity="center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="PopupWindow显示"
        android:textColor="@android:color/holo_red_light" />

</LinearLayout>