tree b8c11c2df32ffa4d08faa06d16753cec4b4cda49
parent d4474cb9454c7a8b907c0be07236ffed4ecf3fd8
author Chet Haase <chet@google.com> 1430869404 -0700
committer Chet Haase <chet@google.com> 1430884678 -0700

Fix leak in LayoutTransition

Previously, an OnPreDrawListener was added to clean things up, including
removing the listener, after animations are started.
But if the view is detached before that listener is called, the
listener will remain on that ViewTreeObserver.

This change adds an OnAttachStateChangeListener to perform that cleanup
step when the view is detached, just in case.

Issue #20824645 Leak in LayoutTransition

Change-Id: I264812f8e02dda673789712ba83d208e87cdc5a4