commit 5e29c076cb0210b8698fdced8e985327bf2d75dd
author Evan Rosky <erosky@google.com> Fri Jun 02 17:31:22 2017 -0700
committer Evan Rosky <erosky@google.com> Mon Nov 06 13:11:18 2017 -0800
tree 06b5c32e8d0fd7d3aa7dfea0f40e1779a5552d73
parent 181799bc53c45282ffa50669430a5cb41f5c194d

Add "KeyFallback" handling ability to Views

This gives any view the ability to receive unhandled KeyEvents.
The order of Views receiving fallback key events is inverse
drawing order: this means higher views will receive fallback
events first.

FallbackHandlers can be added to any view via
addKeyFallbackListener. Within a view, listeners are tapped
in reverse order (such that more-recently added listeners will
receive the event first).

Bug: 32722450
Test: Added a CTS test ViewTest#testKeyFallback
Change-Id: Ibfff4db70de8fb98db0035e5aeb09271be1574c6