[android-developers] Muting the music stream

[Des]

I'm building up a small app that should mute and unmute the music stream 
using the class AudioManager.
When I run the app, it works: clicking on the toggle button I can do the 
stuff. The problem is when I mute the stream and close the app.
(the stream is muted now) I start the app and it displays the stream is 
muted (fine! ), I click the button to unmute it but it doesn't work.
I've attached the code I used for better understanding)

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public void onToggleClicked(View view) {
                switch(view.getId()){
                case R.id.tb_music:
                        if (!isMuted(AudioManager.STREAM_MUSIC)){
                                
audioMgr.setStreamVolume(AudioManager.STREAM_MUSIC, 0, 0);
                        audioMgr.setStreamMute(AudioManager.STREAM_MUSIC,true);
                        
                        }else{
                                
                                
audioMgr.setStreamMute(AudioManager.STREAM_MUSIC,false);
                                
audioMgr.setStreamVolume(AudioManager.STREAM_MUSIC, 
(audioMgr.getStreamMaxVolume(AudioManager.STREAM_MUSIC))/2,
                                                        
AudioManager.FLAG_PLAY_SOUND);
                        }
//other cases
}

public boolean isMuted(int stream){
                boolean value;
                if (audioMgr.getStreamVolume(stream)== 0){
                        value = true;
                }else{
                        value = false;
                }
                
                return value;
        }