PopupWindow error: PopupWindow $1. NullPointerEx appears in onScrollChanged

Error 1:

1.onScrollChanged(PopupWindow.java:127607145313351991991504385507849607

This error often occurs in Gingerbread or earlier versions, less than 3.0. Is a system bug

Solution:

Add the following method after new PopupWindow for check. To be compatible with versions earlier than 3.0, this operation is necessary.

  fixPopupWindow( (Build.VERSION.SDK_INT < Field fAnchor = PopupWindow."mAnchor"= PopupWindow."mOnScrollChangedListener" ViewTreeObserver.OnScrollChangedListener originalListener ==  <View> mAnchor = (WeakReference<View> (mAnchor ==  || mAnchor.get() == 

Refer:

Https://github.com/JakeWharton/ActionBarSherlock/issues/752

Https://groups.google.com/forum? Fromgroups = #! Msg/osmeditor4android/RsHYoY6XqlU/-WGSKWm5OMAJ

 

Error 2:

1426262725921881991303687507867625

Solution: Do not call setFocusable (true) when creating a PopupWindow, call setFocusable (true) after showAtLocation, and call setFocusable (false) When dismiss occurs)

Refer:

Http://stackoverflow.com/questions/7768728/popupwindow-crash-on-dispatch-event

Http://www.eoeandroid.com/thread-109193-1-1.html