(收藏）Android 的各种listener and states event

1. Android Listeners: 

http://developer.android.com/reference/android/view/View.html

2. States event: 

1). http://stackoverflow.com/questions/8411418/android-button-states-programmatically-in-java-not-xml

 2). http://stackoverflow.com/questions/5092649/android-how-to-update-the-selectorstatelistdrawable-programmatically

3).http://developer.android.com/reference/android/graphics/drawable/StateListDrawable.html

4). http://developer.android.com/reference/android/widget/ImageButton.html