在玩遊戲過程中將遊戲靜音後，可以播放後臺背景音樂。取消靜音播放遊戲音樂，暫停後臺背景音樂

Android 

/**播放*/ 
public void start(View v){
        AudioManager audioManager = (AudioManager) content.getSystemService(Context.AUDIO_SERVICE);
        audioManager.abandonAudioFocus(null);
    }
/**暫停*/
    public void stop(View v){
        AudioManager audioManager = (AudioManager) content.getSystemService(Context.AUDIO_SERVICE);
        if(audioManager.isMusicActive()){
            audioManager.requestAudioFocus(null, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);
        }
    }