Use index in SparseArray access properly

The original code was calling get() rather than valueAt(),
treating index as if it was a key.

Change-Id: I52539dfcb49b3d2ee3cb027d38c50b46f73b5ee7
Signed-off-by: Igor Chernyshev <igorc@google.com>
Merge "Use index in SparseArray access properly"