Is it possible to increase the strength of the alarm vibration?
Another thing you can do is press and hold the volume down button until its all the way down and you feel vibration. But make sure that the volume you are managing is system sound and not media sound. You can also change the alert type to vibration by going to settings and then selecting Sounds and Vibrations.
Go to Settings > Customize Notifications. Tap Vibrate pattern. Choose the pattern you like.
apparently not,
under android.os.Vibrator, you can set the pattern as well as the duration
vibrate(long[] pattern, int repeat)
vibrate(long milliseconds)
my guess is that different patterns can be used to "simulate" a stronger vibrate. (on,off,on,off) rather than (on, off, off, off, on).
also a disharmonious pattern may be more effective than a pattern with a fixed rhythm.
The Vibrator Class does not allow for this, you can only set the duration.
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