android - 如何检查 MediaRecorder.AudioSource.VOICE_CALL 是否可用？

Question

我想验证 voice_call 的音频源是否可用：

MediaRecorder.AudioSource.VOICE_CALL

由于某些设备不允许，如何检查我是否可以以编程方式记录电话？

提前致谢。

科比

Answer 1

检查的方法是尝试记录并捕获异常。没有人想出任何其他方法来提前知道该设备是否可以工作。如果您发现异常，您可以尝试从 MediaRecorder.AudioSource.MIC 开始录制。如果手机的喇叭声音小，你会发现只有手机的主人会被录音，而线路上的对方不会，但这是你能做的最好的了。

我还没有看到禁用这些功能的手机型号列表。这肯定是一个方便的清单。

Answer 2

我认为您可以改用 MediaRecorder.AudioSource.MIC。

Answer 3

我做了这个过程：我尝试在我想要的形状的 try / catch 块中创建一个文件，在开始和停止记录器时，一切顺利，它与选定的音频源一起工作。

public class sRecAudioMic extends Service {

DecimalFormat fCoordenadas = new DecimalFormat("##.00000000");
DecimalFormat fVelocidade = new DecimalFormat("##.0");
static String imei = "";

private static String FORMATO_AUDIO = ".aac";
static String AUDIO_RECORDER_FOLDER = "";
static String codigo_usuario = "";

int contSegundos = 0;

static MediaRecorder recorder;

Boolean cancelTask = false;

eChamada chamada;

Context context;

public sRecAudioMic() {
}



@Override
public IBinder onBind(Intent intent) {
    throw new UnsupportedOperationException("Not yet implemented");
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {

    return super.onStartCommand(intent, flags, startId);
}

@Override
public void onCreate() {
    imei = Functions.getIMEI(sRecAudioMic.this);

    AUDIO_RECORDER_FOLDER = new _Path().getPathAudio();
}

@SuppressLint("InlinedApi")
@Override
public void onStart(Intent intent, int startId) {

    try
    {
        Bundle b = intent.getExtras();
        chamada = (eChamada) b.getSerializable("Chamada");

        //chamada = (eChamada) intent.getParcelableExtra("Chamada");
        String t = "";
        t = " ";
    }
    catch(Exception e)
    {
        String t = "";

        t = " ";
    }       

    String nomeArquivo = "";

    int cont = 0;

    Calendar lCDateTime = Calendar.getInstance();

    String t = String.valueOf(lCDateTime.getTimeInMillis());

    nomeArquivo = "recording_" + t + FORMATO_AUDIO;

    nomeArquivo = nomeArquivo.replace(" ", "_").replace(":", "_")
            .replace("-", "_");

    String caminhoArquivo = AUDIO_RECORDER_FOLDER + "/" + nomeArquivo;

    chamada.nomeArquivo = nomeArquivo;
    chamada.caminhoArquivo = caminhoArquivo;

    try {

        recorder = new MediaRecorder();

        try {

            MediaRecorder r = new MediaRecorder();
            r.setAudioSource(MediaRecorder.AudioSource.VOICE_CALL);
            r.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
            r.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
            r.setOutputFile(caminhoArquivo);
            r.setAudioSamplingRate(96000);
            r.prepare();
            r.start();
            r.stop();
            r.reset();
            r.release();

            r = null;

            recorder.setAudioSource(MediaRecorder.AudioSource.VOICE_CALL);

        } catch (Exception e) {

            MediaRecorder r = new MediaRecorder();
            r.setAudioSource(MediaRecorder.AudioSource.MIC);
            r.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
            r.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
            r.setOutputFile(caminhoArquivo);
            r.setAudioSamplingRate(96000);
            r.prepare();
            r.start();
            r.stop();
            r.reset();

            r = null;

            recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        }

        recorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
        recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
        recorder.setAudioSamplingRate(96000);
        // recorder.setMaxDuration(30000);

        recorder.setOutputFile(caminhoArquivo);

        recorder.setOnErrorListener(errorListener);
        recorder.setOnInfoListener(infoListener);

        recorder.prepare();
        recorder.start();

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

        new LOG().CriaLog("sRecAudioMic", "onStart()", e.getMessage(), "");

    } finally {

    }

}

@Override
public void onDestroy() {

    String time = new java.text.SimpleDateFormat("dd/MM/yyyy HH:mm:ss")
            .format(new java.util.Date());

    if (null != recorder) {

        // para gravacao
        recorder.stop();
        recorder.reset();
        recorder.release();

        recorder = null;
    }

    chamada.timestampChamadaTerminada = time;

    ChamadasDataSource dsCham = new ChamadasDataSource(sRecAudioMic.this);

    dsCham.open();

    dsCham.insert(chamada);

    dsCham.close();

}

@SuppressLint("NewApi")
private MediaRecorder.OnErrorListener errorListener = new MediaRecorder.OnErrorListener() {
    @Override
    public void onError(MediaRecorder mr, int what, int extra) {

    }
};

@SuppressLint("NewApi")
private MediaRecorder.OnInfoListener infoListener = new MediaRecorder.OnInfoListener() {
    @Override
    public void onInfo(MediaRecorder mr, int what, int extra) {

    }
};

}