增加PopView:
1.可以在AbsoluteLayout中移动PopView;
2.可以全屏/半屏切换PopView;
#	modified:   AndroidManifest.xml
#	modified:   res/drawable/pop_bg.xml
#	modified:   res/layout/activity_my_popup_window.xml
#	new file:   res/layout/popview.xml
#	modified:   res/values/strings.xml
#	modified:   src/com/example/mypopupwindow/MyPopupWindow.java
#	new file:   src/com/example/popview/PopView.java