tree 59207ca231e9fa81100c7b1788bf626d4eae42ae
parent 694a787b2a715f53039b65690d08c94843101c9b
author Keyvan Amiri <keyvana@google.com> 1482885426 -0800
committer Keyvan Amiri <keyvana@google.com> 1483478452 -0800

Fixed focus recovery failure on API 15

On API 15, RV can still hold a reference to a detached view as its
focused child. This made the focus recovery break when removing the
final focused view of RV. In this case, while RV essentially had no
children, it still considered that detached view as its focused child.
The correct behavior for RV is to grab the focus back when all its
children are removed.
Reworked the focus handling for API 15.

Change-Id: I3522f5d9f8315770c692070f3628c7ab9a0e368a
Fixes: 33280166
Test: ./gradlew support-recyclerview-v7:connectedCheck
-Pandroid.testInstrumentationRunnerArguments.class=android.support.v7.widget.RecyclerViewFocusRecoveryTest
Tested on emulator devices running API 15, 21 and a physical Nexus 5X
API 24.