Can’t stop the ringing alarm from another activity

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Your architecture is broken. You don’t use a BroadcastReceiver for persistent processing. A BroadcastReceiver has a very short lifecycle, you use it to trigger other things.

You’ve created a MediaPlayer instance in your BroadcastReceiver and are trying to control that in onReceive(). This is wrong. You should use a Service to manage and maintain the state of your MediaPlayer.

See if you can find some HOWTO guides on the Internet for how to build such an application.

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