如何在背景音乐中录制声音

Question

在我的应用程序中，我必须用音乐录制声音。当我点击录音按钮时，音乐开始，录音也将开始。用户将唱这首歌，这首歌将用音乐录制。

在我的代码歌曲中没有录制音乐。它只记录用户的声音。请检查我的代码并建议我。

recorder = new MediaRecorder();
    record_btn.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            try {
                mPlayer = MediaPlayer.create(RecordVoiceActivity.this, R.raw.intro);
                mPlayer.start();

                long dtMili = System.currentTimeMillis();
                primarySongName=""+dtMili;
                // Date dt = new Date(dtMili);
                Toast.makeText(RecordVoiceActivity.this,
                        "Recording starting", Toast.LENGTH_LONG).show();
                recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
                recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
                recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
                currentDateTimeString = DateFormat.getDateInstance()
                        .format(new Date());
                Log.d("##################################", "" + dtMili);
                recorder.setOutputFile("/sdcard/Recordedsong_" + dtMili + ".3gp");
                recorder.prepare();
                recorder.start();
            } catch (IllegalStateException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    });
    stop_btn.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            try {
                // TODO Auto-generated method stub
                Toast.makeText(RecordVoiceActivity.this,
                        "Recording stopped", Toast.LENGTH_LONG).show();
                mPlayer.stop();
                recorder.stop();
                recorder.release();
            } catch (IllegalStateException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    });

    replay_btn.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            try {
                // TODO Auto-generated method stub
                Log.d("############################", currentDateTimeString);
                Uri path = Uri.parse(Environment.getExternalStorageDirectory()
                        + "/" + "Recordedsong_" + primarySongName
                        + ".3gp");
                MediaPlayer player = MediaPlayer.create(
                        RecordVoiceActivity.this, path);
                player.setLooping(false);
                player.start();
            } catch (IllegalStateException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

        }
    });

在此代码中，M录制歌曲并保存在我的Sd卡中。然后从Sdcard重播。 但是歌曲正在播放没有我正在播放的音乐。