Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
v.vibrate(400);Shaking of an Android device is possible in all circumstances with a call to getSystemService(Context.VIBRATOR_SERVICE) (API 26) or getSystemService(Context.VIBRATOR.MANAGER.SERVICE) (API 31).
Behind this effect stands a specific miniature hardware component, motor or actuator, that consumes power.
As a consequence, its usage must be discouraged, especially since its added value is not clear.
API 26:
Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
v.vibrate(400);API 31:
VibratorManager vm = (VibratorManager) getSystemService(Context.VIBRATOR_MANAGER_SERVICE);
vm.getDefaultVibrator().vibrate(VibrationEffect.createOneShot(500, VibrationEffect.DEFAULT_AMPLITUDE));