1. Remove the redundant part about active ime.
2. Add a NPE detector to fix bug.
3. Check if input device is detected as touchpad.
Bug: 247080509
Bug: 267092726
Test: manual
Change-Id: I40640e42abd471efde6d1f9166b8999243499c62
Integrate UI with these APIs.
1. getKeyboardLayoutListForInputDevice
2. getKeyboardLayoutForInputDevice
3. setKeyboardLayoutForInputDevice
Demo: go/pk_with_final_api_demo
Bug: 247079681
Test: local test
Change-Id: I5478e2c344a47e692e7c524f8c1e96d9dda52796