这是因为您没有在Notification上声明要振动的Vibrator类。在您的通知构建器中，放置此代码并根据您的选择设置振动的持续时间。

It is because you did not declare the Vibrator class to vibrate on Notification.In your notification builder put this code and set the duration of vibrate based on your choose.

    Vibrator v = (Vibrator) this.context.getSystemService(Context.VIBRATOR_SERVICE);
 // Vibrate for 500 milliseconds
 v.vibrate(500);