Description: 其实popupwindow用起来比Dialog 方便，因为dialog一切都需要你自己来实现，而popupwindow帮我们实现了很多，我认为在使用的时候关键我们要看清参数：
popupWindow.showAtLocation(parent, gravity, x, y)
parent这个是一个父view试图，
gravity 这个默认是居中，我们要指定显示方式：Gravity.LEFT
| Gravity.TOP
最后两个参数就是显示的坐标位置，这样就可以根据需求自己定位显示位置了
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File list (Check if you may need any files):
PopupWindowDemo
...............\PopupWindowDemo
...............\...............\.classpath
...............\...............\.project
...............\...............\AndroidManifest.xml
...............\...............\assets
...............\...............\bin
...............\...............\...\classes
...............\...............\...\.......\com
...............\...............\...\.......\...\jj
...............\...............\...\.......\...\..\popupwindow
...............\...............\...\.......\...\..\...........\BuildConfig.class
...............\...............\...\.......\...\..\...........\MainActivity$1.class
...............\...............\...\.......\...\..\...........\MainActivity$2.class
...............\...............\...\.......\...\..\...........\MainActivity.class
...............\...............\...\.......\...\..\...........\R$attr.class
...............\...............\...\.......\...\..\...........\R$drawable.class
...............\...............\...\.......\...\..\...........\R$id.class
...............\...............\...\.......\...\..\...........\R$layout.class
...............\...............\...\.......\...\..\...........\R$string.class
...............\...............\...\.......\...\..\...........\R$style.class
...............\...............\...\.......\...\..\...........\R.class
...............\...............\...\classes.dex
...............\...............\...\jarlist.cache
...............\...............\...\PopupWindowDemo.apk
...............\...............\...\res
...............\...............\...\...\drawable-hdpi
...............\...............\...\...\.............\click.9.png
...............\...............\...\...\.............\grouplist_item_bg_normal.png
...............\...............\...\...\.............\ic_launcher.png
...............\...............\...\...\drawable-ldpi
...............\...............\...\...\.............\ic_launcher.png
...............\...............\...\...\drawable-mdpi
...............\...............\...\...\.............\ic_launcher.png
...............\...............\...\...\drawable-xhdpi
...............\...............\...\...\..............\ic_launcher.png
...............\...............\...\resources.ap_
...............\...............\gen
...............\...............\...\com
...............\...............\...\...\jj
...............\...............\...\...\..\popupwindow
...............\...............\...\...\..\...........\BuildConfig.java
...............\...............\...\...\..\...........\R.java
...............\...............\proguard-project.txt
...............\...............\project.properties
...............\...............\res
...............\...............\...\drawable-hdpi
...............\...............\...\.............\click.9.png
...............\...............\...\.............\grouplist_item_bg_normal.png
...............\...............\...\.............\ic_launcher.png
...............\...............\...\drawable-ldpi
...............\...............\...\.............\ic_launcher.png
...............\...............\...\drawable-mdpi
...............\...............\...\.............\ic_launcher.png
...............\...............\...\drawable-xhdpi
...............\...............\...\..............\ic_launcher.png
...............\...............\...\layout
...............\...............\...\......\dialog.xml
...............\...............\...\......\main.xml
...............\...............\...\......\text.xml
...............\...............\...\values
...............\...............\...\......\strings.xml
...............\...............\...\......\style.xml
...............\...............\src
...............\...............\...\com
...............\...............\...\...\jj
...............\...............\...\...\..\popupwindow
...............\...............\...\...\..\...........\MainActivity.java
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