media player - Stop sound file when back pressed in Android -


i have audio files in listview play them randomly. while file playing want go pressing button, in method onbackpressed put following

 if(mmediaplayer.isplaying())     {         mmediaplayer.release();         mmediaplayer = null;     }else     {         //show message or     }

but not working , fatal exception main nullpointerexception in case audio not playing

try code , may you

 if(mmediaplayer!=null && mmediaplayer.isplaying())     {         mmediaplayer.release();         mmediaplayer = null;     }else     {         //show message or     }

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