MediaPlayer NullPointerException in local method

Question

My file is perfectly fine and works well on onCreate, but when I have a method call like this it is failing with NullPointerException

public void playSelectedFile() throws IOException {
    mediaPlayer = new MediaPlayer();
    mediaPlayer.reset();
    mediaPlayer.setDataSource(PredefinedUserPlayer.this, Uri.parse(mp3name));
    mediaPlayer.prepare();
    mediaPlayer.start();
}

Stack trace of the error:

 java.lang.NullPointerException
            at android.content.ContextWrapper.getContentResolver(ContextWrapper.java:99)
            at android.media.MediaPlayer.setDataSource(MediaPlayer.java:882)
            at android.media.MediaPlayer.setDataSource(MediaPlayer.java:859)
            at lukasz.musik.PredefinedUserPlayer.playSelectedFile(PredefinedUserPlayer.java:86)
            at lukasz.musik.CustomMusicAdapter$ViewHolder$1.onClick(CustomMusicAdapter.java:85)
            at android.view.View.performClick(View.java:4240)
            at android.view.View$PerformClick.run(View.java:17721)
            at android.os.Handler.handleCallback(Handler.java:730)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5103)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:525)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
            at dalvik.system.NativeStart.main(Native Method)

NOTE: The url mp3name is valid. It works in onCreate but not in playSelectedFile()

It keeps crashing with NullPointerException and mp3name is a valid URL. If the same block of code is in the onCreate method the compiler does not complain. Any ideas or suggestions?

Show your full stack trace and point out the line number that matches your code sample? — Doug Stevenson, Feb 23 '16 at 23:34
The `mp3name` uri is valid and works in `onCreate` its something like `http://XX.X.X.X/musik/musikz01.mp3` It works well in `onCreate` not the `playSelectedFile()` method. I have attached the stack trace — Lukazs Pioetrszci, Feb 23 '16 at 23:41
The problem is that you have a reference that is NULL where you obviously expects it to be something else. You might want to insert some log messages in which you print out variables to see which creates the NULL pointer. — ArchiFloyd, Feb 23 '16 at 23:59
Looks like you're going to have to ask your question again and say in the text that this is not your typical NullPointerException. — Doug Stevenson, Feb 24 '16 at 00:07
I didn't initialize the `MediaPlayer` in `onCreate`. Is that needed? — Lukazs Pioetrszci, Feb 24 '16 at 00:08
No, the person who closed this incorrectly diagnosed the problem. — Doug Stevenson, Feb 24 '16 at 01:54

MediaPlayer NullPointerException in local method

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