我不是100%确定,但可能是这个文件中的changeState方法:
http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android-apps/4.0.1_r1/com/android/launcher2/Workspace.java#Workspace.changeState%28com.android.launcher2.Workspace.State%2Cboolean%2Cint%29 - Michał Z.