CODEWITHSUNDEEP
androidandroid-mediaplayeralarmmanager
Aditya Sawant
Aditya Sawant

Reputation: 323

Android AlarmManager using default alarm tone

I am trying to use Alarm Manager in Android. What I want is when the Alarm goes off it should play the default alarm clock tone that I have set for the android clock. I used the following code

Uri uri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM);
    mp = MediaPlayer.create(context, uri);
    mp.start();

However, I get following exception

java.lang.RuntimeException: Unable to start receiver com.example.user.alarmmanager.MyBroadcastReceiver: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.media.MediaPlayer.start()' on a null object reference
        at android.app.ActivityThread.handleReceiver(ActivityThread.java:2732)
        at android.app.ActivityThread.-wrap14(ActivityThread.java)
        at 

android.app.ActivityThread$H.handleMessage(ActivityThread.java:1421)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:148)
            at android.app.ActivityThread.main(ActivityThread.java:5417)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.media.MediaPlayer.start()' on a null object reference
            at com.example.user.alarmmanager.MyBroadcastReceiver.onReceive(MyBroadcastReceiver.java:25)
            at android.app.ActivityThread.handleReceiver(ActivityThread.java:2725)
            at android.app.ActivityThread.-wrap14(ActivityThread.java)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1421)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:148)
            at android.app.ActivityThread.main(ActivityThread.java:5417)

Please help

Upvotes: 1

Views: 1047

Answers (3)

moumenShobakey
moumenShobakey

Reputation: 426

i amn't sure but .. try making an instance of MediaPlayer and then use (setDataSource) instead

Upvotes: 0

chehthan
chehthan

Reputation: 213

Hey Guys if ALARM tone is none there is possible of crash.

Upvotes: 1

Larry Schiefer
Larry Schiefer

Reputation: 15775

It's because MediaPlayer.create() is returning null, indicating it had creation problems. This is most likely because you're trying to create it in the context of a BroadcastReceiver which is a transient object and the Context object provided to your onReceive() method is a reduced functionality Context. Receivers cannot block or do any type of heavy operation. You should have your BroadcastReceiver start/message a Service running in your app to do the actual playback.

Upvotes: 0

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