play & stop music player on java android programing
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     Button b = (Button) findViewById(R.id.button1);
            b.setOnClickListener(new OnClickListener() {
    			MediaPlayer mp = MediaPlayer.create(main.this, R.raw.lastmohican);
    			public void onClick(View arg0) {
    				// TODO Auto-generated method stub
    				if (mp.isPlaying()) {
    					mp.stop();
    				} else {
    					mp.start();
    				}
    			}

plz help me i can play this music by one click and another click music is stoped but i click together music dont start why ?