<uses-feature android:name="android.hardware.touchscreen" android:required="false" />
onStop()
onStart()
onConfigurationChanged()
android:configChanges="screenSize|smallestScreenSize|orientation|screenLayout".
onSaveInstanceState()
<uses-feature android:name="android.hardware.type.pc" android:required="false" />
android:nextFocusForward
android:nextFocusUp
android:nextFocusDown
android:nextFocusLeft
android:nextFocusRight
ACTION_CANCEL
