AppViewer on Android

1.  Show all the apps on your device, include system apps.
2.  Search apps by the keywords of name or package name.
3.  Support sort the apps list by app's name, package name, install time, size.
4.  Convenient way to open app(long click to the list item) or open system AppInfo or Uninstall.

@author piorpua
@email helloworld.hnu@gmail.com