[Android] layout, icon, language reference

Android icon size:
http://iconhandbook.co.uk/reference/chart/android/

Android 單位尺寸使用，重點在於螢幕的密度，而不是尺寸
http://kny.cc/post/89831938759/android-units

App luncher icon size in pixels for different resolution
http://stackoverflow.com/questions/16706076/drawable-folder-for-different-resolution-and-application-icon-size

2560 * 1440 =16:9