我正在尝试开发录制通话的应用程序.

当我录制输出声音听起来非常有线 – 电子声音而不是
别人的声音.

这是我的代码：

public class MainActivity extends Activity implements OnClickListener {
private Boolean Recording;
private Button btn_REC;
private MediaRecorder mrec;
private File audiofile = null;
private static final String TAG = "SoundRecordingDemo";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.main);
    Recording = false;
    mrec = new MediaRecorder();
    btn_REC = (Button) findViewById(R.id.btn_record);
    btn_REC.setOnClickListener(this);
}

@Override
public void onClick(View v)
{
    if (!Recording)
    {
        try
        {
            startRecording();
            Recording = true;
        }
        catch (IOException e1)
        {
            e1.printStackTrace();
        }

        btn_REC.setText("RECORDING");
    }


    else
    {       
        stopRecording();
        btn_REC.setText("RECORD");
    }


}

protected void startRecording() throws IOException {
    mrec.setAudioSource(MediaRecorder.AudioSource.VOICE_DOWNLINK);
    mrec.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
    mrec.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    if (audiofile == null) {
        File sampleDir = Environment.getExternalStorageDirectory();
        try {
            audiofile = File.createTempFile("ibm", ".3gp", sampleDir);
        } catch (IOException e) {
            Log.e(TAG, "sdcard access error");
            return;
        }
    }
    mrec.setOutputFile(audiofile.getAbsolutePath());
    mrec.prepare();
    mrec.start();
}

protected void stopRecording() {
    mrec.stop();
    mrec.release();
    processaudiofile();
}

protected void processaudiofile() {
    ContentValues values = new ContentValues(3);
    long current = System.currentTimeMillis();
    values.put(MediaStore.Audio.Media.TITLE, "audio" + audiofile.getName());
    values.put(MediaStore.Audio.Media.DATE_ADDED, (int) (current / 1000));
    values.put(MediaStore.Audio.Media.MIME_TYPE, "audio/3gpp");
    values.put(MediaStore.Audio.Media.DATA, audiofile.getAbsolutePath());
    ContentResolver contentResolver = getContentResolver();

    Uri base = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
    Uri newUri = contentResolver.insert(base, values);

    sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, newUri));
}

}

当我试图将AudioSource更改为上行链路或语音呼叫时,它仍然是相同的.
当我把它定义为MIC时,所有工作都很好,但当我打电话时,这个奇怪的声音开始……

有什么想法吗？

谢谢！

解决方法:

使用mRecorder.setAudioSource(MediaRecorder.AudioSource.VOICE_CALL);

但是,由于Call Recording不合法,所以许多设备不支持(MediaRecorder.AudioSource.VOICE_CALL / MediaRecorder.AudioSource.VOICE_DOWNLINK),可以在某些设备上运行.

我在LG测试过它并且工作正常,但没有使用Nexus设备.

所以相反,它们使用所有设备都允许的MediaRecorder.AudioSource.MIC.