android - 在android中使用MIC以mp3格式录制音频

Question

我想在 android 中使用 MIC 以 mp3 格式录制音频。我尝试记录下面的代码，但是当我检查 sdcard(路径:sdcard/recording.mp3)时，该文件不起作用。(文件大小为 0kb)。

如何在 android 中以 mp3 或 wav 格式录制麦克风音频。请帮忙。

private final int FREQUENCY = 11025;
private final int CUSTOM_FREQ_SOAP = 1;
private final int OUT_FREQUENCY = FREQUENCY * CUSTOM_FREQ_SOAP;
private final int CHANNEL_CONTIGURATION = AudioFormat.CHANNEL_CONFIGURATION_MONO;
private final int AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;

======

try {
        mRecordingFile = File.createTempFile("recording", ".mp3", new File("/sdcard/"));


    } catch (IOException e) {
        throw new RuntimeException("Couldn't create file on SD card", e);
    }

======

private class RecordAudio extends AsyncTask<Void, Integer, Void> {
    @Override
    protected Void doInBackground(Void... params) {
        isRecording = true;
        try {
            DataOutputStream dos = new DataOutputStream(
                    new BufferedOutputStream(new FileOutputStream(
                            mRecordingFile, true)));

            int bufferSize = AudioRecord.getMinBufferSize(FREQUENCY,
                    CHANNEL_CONTIGURATION, AUDIO_ENCODING);

            AudioRecord audioRecord = new AudioRecord(
                    MediaRecorder.AudioSource.MIC, FREQUENCY,
                    CHANNEL_CONTIGURATION, AUDIO_ENCODING, bufferSize);

            short[] buffer = new short[bufferSize];
            audioRecord.startRecording();

            while (isRecording) {
                int bufferReadResult = audioRecord.read(buffer, 0,
                        bufferSize);
                int amplitude = 0;
                for (int i = 0; i < bufferReadResult; i++) {
                    dos.writeShort(buffer[i]);
                    amplitude += Math.abs((int) buffer[i]);
                }
                final int amp = amplitude;

            }

            audioRecord.stop();
                //dos.close();


        } catch (Throwable t) {
        }

        return null;
    }

Answer 1

public void recordAudio(String fileName) {
    final MediaRecorder recorder = new MediaRecorder();
    ContentValues values = new ContentValues(3);
    values.put(MediaStore.MediaColumns.TITLE, fileName);
    recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    recorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
    recorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
    recorder.setOutputFile("/sdcard/sound/" + fileName);
    try {
      recorder.prepare();
    } catch (Exception e){
        e.printStackTrace();
    }

    final ProgressDialog mProgressDialog = new ProgressDialog(MyActivity.this);
    mProgressDialog.setTitle(R.string.lbl_recording);
    mProgressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
    mProgressDialog.setButton("Stop recording", new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int whichButton) {
        mProgressDialog.dismiss();
        recorder.stop();
        recorder.release();
        }
    });

    mProgressDialog.setOnCancelListener(new DialogInterface.OnCancelListener(){
        public void onCancel(DialogInterface p1) {
            recorder.stop();
            recorder.release();
        }
    });
    recorder.start();
    mProgressDialog.show();
}