i want to play two files one after another on a single click of Button [closed]

i want to play two files one after another on a single click of Button.Files are in assets folder .

if (play) 

{ mp.stop(); 

  mp.release(); 

  mp = null; 

} 

btn1.setImageDrawable(getResources().getDrawable(R.drawable.key1)); 

mp = new MediaPlayer(); 

try { 

     descriptor = getAssets().openFd("c1.mp3"); 

     descriptor1 = getAssets().openFd("d2.mp3");

     mp.setDataSource(descriptor.getFileDescriptor(), descriptor.getStartOffset(), descriptor.getLength()); 

     mp.prepare(); 

    mp.start();

     mp.setDataSource(descriptor1.getFileDescriptor(), descriptor1.getStartOffset(), descriptor1.getLength()); 

     mp.prepare(); 

    mp.start(); 

    } 

catch (IOException e) 

    { // TODO Auto-generated catch block 

      e.printStackTrace(); 

    } 



play = true