enable vibrate mode in android apps

问题

i m setting vibrate mode in my app so that when notification comes phone gets vibrated. I do see many apps uses different profiles like low, medium & high as option in vibrate mode.

i know the way to use vibrate in android apps ie

Vibrator vibrator;
vibrator = (Vibrator)getSystemService(Context.VIBRATOR_SERVICE);
vibrator.vibrate(3000);

for different profiles, we need to set the time manually or any system defined standard way is there to use for vibrate option?

来源：https://stackoverflow.com/questions/27746707/enable-vibrate-mode-in-android-apps