java.lang.RuntimeException：在 android.media.MediaRecorder.start（本机方法）处启动失败

Question

我正在记录一个电话。当我开始记录电话时，不幸的是它停止了。 & 它给出了错误 MediaRecorder 启动失败 -2147483648。我请告诉我我的代码有什么问题？这是我的代码。

public class incomingcall extends BroadcastReceiver {
Context c;
MediaRecorder recorder;
public incomingcall() {
}
@Override
public void onReceive(Context context, Intent intent) {
    c = context;
    try {
        PhoneStateChangeListener pscl = new PhoneStateChangeListener();
        TelephonyManager tm = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
        tm.listen(pscl, PhoneStateListener.LISTEN_CALL_STATE);
    } catch (Exception e) {
        Log.e("", "", e);
    }
}

private class PhoneStateChangeListener extends PhoneStateListener {
    @Override
    public void onCallStateChanged(int state, String incomingNumber) {
        switch (state) {
            case TelephonyManager.CALL_STATE_RINGING:
                Toast.makeText(c, "ring", Toast.LENGTH_SHORT).show();
                break;
            case TelephonyManager.CALL_STATE_OFFHOOK:
                startRecording();
                Toast.makeText(c, "offhook", Toast.LENGTH_SHORT).show();
                break;
            case TelephonyManager.CALL_STATE_IDLE:
                stopRecording();
                Toast.makeText(c, "idle", Toast.LENGTH_SHORT).show();
                break;
        }
    }
}
private void startRecording() {
    try {
        recorder = new MediaRecorder();
        recorder.setAudioSource(MediaRecorder.AudioSource.VOICE_CALL);
        recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        String file=c.getFilesDir().getAbsolutePath();
        file+="/sound.3gp";
        recorder.setOutputFile(file);
        recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
        recorder.prepare();
        recorder.start();
    } catch (IOException e) {
        Log.e("", "prepare() failed", e);
    }
}
private void stopRecording() {
    try {
        recorder.stop();
        recorder.release();
        recorder = null;
    } catch (Exception e) {
        Log.e("", "", e);
    }
 }
}

日志

    07-20 15:33:47.867 18525-18525/in.pounkumar.callblocker E/MediaRecorder: start failed: -2147483648
07-20 15:33:47.868 18525-18525/in.pounkumar.callblocker E/AndroidRuntime: FATAL EXCEPTION: main
                                                                          Process: in.pounkumar.callblocker, PID: 18525
                                                                          java.lang.RuntimeException: start failed.
                                                                              at android.media.MediaRecorder.start(Native Method)
                                                                              at in.pounkumar.callblocker.incomingcall.startRecording(incomingcall.java:73)
                                                                              at in.pounkumar.callblocker.incomingcall.access$100(incomingcall.java:20)
                                                                              at in.pounkumar.callblocker.incomingcall$PhoneStateChangeListener.onCallStateChanged(incomingcall.java:53)
                                                                              at android.telephony.PhoneStateListener$2.handleMessage(PhoneStateListener.java:295)
                                                                              at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                              at android.os.Looper.loop(Looper.java:148)
                                                                              at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                                              at java.lang.reflect.Method.invoke(Native Method)
                                                                              at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                                              at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

Answer 1

MediaRecorder.AudioSource.VOICE_CALL 源需要 CAPTURE_AUDIO_OUTPUT 权限。 See Android Docs

您是否在清单中添加了此权限

 <uses-permission android:name="android.permission.CAPTURE_AUDIO_OUTPUT" />

Answer 2

MediaRecorder.start 方法在您的情况下失败，原因是：

recorder.setAudioSource(MediaRecorder.AudioSource.VOICE_CALL);

MediaRecorder.AudioSource.VOICE_CALL 源不起作用的原因取决于您的设备制造商/国家等。

因此，这会引发异常，因为您的设备不支持MediaRecorder.AudioSource.VOICE_CALL。

尝试将其更改为MediaRecorder.AudioSource.MIC，它将起作用：

recorder.setAudioSource(MediaRecorder.AudioSource.MIC);

阅读this了解更多详情。

Answer 3

我有同样的问题，我通过对三星和 LG 设备使用不同的初始化解决了这个问题。

        String manufacturer = Build.MANUFACTURER;
    if (manufacturer.toLowerCase().contains("samsung")) {
        recorder.setAudioSource(MediaRecorder.AudioSource.VOICE_COMMUNICATION);
    } else {
        recorder.setAudioSource(MediaRecorder.AudioSource.VOICE_CALL);
    }

希望对你有帮助。