Points to note when modifying the keyboard layout or key mapping in Android

When you modify the keyboard layout or the key mapping in Android, the corresponding KL file needs to be modified in addition to the Scancode modified in InputDevice.

Specific principle:

When a inputdevice driver will press the key scancode to Eventhub, Eventhub will use Scancode to obtain the specific keycode, This step is based on the corresponding inputdevice in the KL file configuration, so if only to report Scancode, do not modify the KL file, it will cause scancode is correct, but can not find the corresponding Mapkey, The final keycode to be escalated is unknown.

Points to note when modifying the keyboard layout or key mapping in Android