android media play

public class MediaController {
    private MediaPlayer mediaPlayer;
    private MediaRecorder mediaRecorder;
    Context context;
    WifiManager.WifiLock wifiLock;

    private static MediaController instance;

    public static synchronized MediaController getInstance(Context context)
    {
        if (instance == null)
            instance = new MediaController(context);

        return instance;
    }

    public void setMediaPlayer(MediaPlayer mediaPlayer){
        this.mediaPlayer = mediaPlayer;
    }

    private MediaController(Context context) {
        this.context=context;
    }

    public MediaPlayer getMediaPlayer(){
        return mediaPlayer;
    }

    public void prepareToPlay(String source , MediaPlayer.OnPreparedListener onPreparedListener , OnFinishCallbacks callbacks){

        try {
            if(mediaPlayer!=null) {
                stopPlaying();
                mediaPlayer = null;
            }

            if(mediaPlayer == null)
                mediaPlayer = new MediaPlayer();

//            wifiLock = ((WifiManager) context.getSystemService(Context.WIFI_SERVICE))
//                    .createWifiLock(WifiManager.WIFI_MODE_FULL, "mylock");
//            wifiLock.acquire();

            mediaPlayer.setWakeMode(context, PowerManager.PARTIAL_WAKE_LOCK);
            mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
            mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
                @Override
                public void onCompletion(MediaPlayer mp) {
                    Logger.log("Media play is complete!!");
//                    stopPlaying();
                    if(callbacks!=null)
                        callbacks.onSuccessed();
                }
            });
            Logger.log("#76 play source ->" + source);
            mediaPlayer.setDataSource(source);
            mediaPlayer.setOnPreparedListener(onPreparedListener);
            mediaPlayer.prepareAsync(); // might take long! (for buffering, etc)


        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void play(){
        if(mediaPlayer!=null) {
            Logger.log("#1290 mediaPlay play~");
            mediaPlayer.start();
        }
    }

    public int pause(){
        if(mediaPlayer!=null){
            mediaPlayer.pause();
            int currentPos = mediaPlayer.getCurrentPosition();
            Logger.log("#1290 mediaPlay pause ~ " + currentPos);
            return currentPos;
        }
        return 0;
    }

    public int getDuration(){
        if(mediaPlayer!=null)
            return mediaPlayer.getDuration();
        return 0;
    }

    public void resume(int length){
        if(mediaPlayer!=null){
            Logger.log("#1290 mediaPlay resume ~" + length);
            mediaPlayer.seekTo(length);
            mediaPlayer.start();
        }
    }

    public void stopPlaying(){
        if (mediaPlayer!=null && mediaPlayer.isPlaying()){
            Logger.log("#1290 mediaPlay stopPlaying ~");
            mediaPlayer.stop();
//            mediaPlayer.release();
//            wifiLock.release();
//            wifiLock = null;
        }
    }

    public void release(){
        if(mediaPlayer != null){
            mediaPlayer.stop();
            mediaPlayer.release();
            mediaPlayer = null;
        }
    }

    public boolean isPlaying(){
        if(mediaPlayer!=null){
            return mediaPlayer.isPlaying();
        }
        return false;
    }

    public void stopRecording(){

        if (mediaRecorder!=null){

            try{
                mediaRecorder.stop();
                mediaRecorder.reset();
                mediaRecorder.release();
                mediaRecorder = null;
                playAlartToStopRecording();
            }catch (Exception ex){
                ex.printStackTrace();
            }finally {

            }

        }
    }

    public void recordStart(){

        if (mediaRecorder!=null){
            mediaRecorder.release();
            mediaRecorder = null;
        }

        playAlartToStartRecording();

        mediaRecorder = new MediaRecorder();
        //녹음 시작
        mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
        mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
        mediaRecorder.setAudioSamplingRate(Variable._SAMPLING_RATE);
        mediaRecorder.setAudioEncodingBitRate(Variable._ENCODING_BIT_RATE);
        mediaRecorder.setAudioChannels(Variable._CHANEL);

        mediaRecorder.setOutputFile(Common.RECORDED_FILE);

        try {
            mediaRecorder.prepare();
            mediaRecorder.start();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public boolean isRecording(){
        return mediaRecorder != null;
    }

    public void playAlartToStartRecording(){
        final MediaPlayer mp = MediaPlayer.create(context, R.raw.record_on);
        if(mp == null)
            return;
        mp.start();
        mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mediaPlayer) {
                mediaPlayer.release();
            }
        });
    }

    public void playAlartToStopRecording(){
        final MediaPlayer mp = MediaPlayer.create(context, R.raw.record_off);
        if(mp == null)
            return;
        mp.start();
        mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mediaPlayer) {
                mediaPlayer.release();
            }
        });
    }
}

MediaController mediaController;
mediaController = MediaController.getInstance(GlobalApplication.get(chatRoomLeftFragView.getContext()));

public void startPlay() {
    if(mediaController == null){
        mediaController = MediaController.getInstance(GlobalApplication.get(chatRoomLeftFragView.getContext()));
    }
    Logger.log("#voice check-->"+chatData.getVoice());
    MediaPlayer.OnPreparedListener onPreparedListener = new MediaPlayer.OnPreparedListener() {
        @Override
        public void onPrepared(MediaPlayer mp) {
            mediaController.setMediaPlayer(mp);
            mediaController.play();
        }
    };

    mediaController.prepareToPlay(chatData.getVoice(), onPreparedListener, new OnFinishCallbacks() {
        @Override
        public void onSuccessed() {
            Logger.log("#1633 #8888 onSuccessed playing sound");
        }

        @Override
        public void onFailed() {
            Logger.log("#1633 #999 onSuccessed canceling Playing sound");
        }
    });
}