Why is it occur?
Attempt to call getDuration without a valid mediaplayer.

How can I make a valid media player?
Thanks

be sure to read and understand the Audio and Video docs on dev.android.com. That should do the trick, if you exchange sound_file_1 with your imported audio file):

Code: Select all

    MediaPlayer mp = MediaPlayer.create(context, R.raw.sound_file_1);
    mp.start();