java.lang.RuntimeException: start failed at android.media.MediaRecorder.start(Native Method)

问题:

I am working on records a phone calls. When i start a record a phone call then it's unfortunately stop. & it's gives error MediaRecorder start fail -2147483648. I Please tell me what is the problem in my code? Here is my Code.

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);     }  } } 

Log

    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) 

回答1:

MediaRecorder.AudioSource.VOICE_CALL source requires the CAPTURE_AUDIO_OUTPUT permission. See Android Docs

Have you added this permission in your manifest

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

回答2:

I have the same problem and i solved it by using different initializations for Samsung and LG devices.

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

Hope it helps you.

回答3:

The MediaRecorder.start method fails in your case, due to this :

recorder.setAudioSource(MediaRecorder.AudioSource.VOICE_CALL); 

The reason why MediaRecorder.AudioSource.VOICE_CALL source doesn't work depends on your device manufacturer/country etc.

So, this is throwing an exception as MediaRecorder.AudioSource.VOICE_CALL is NOT supported on your device.

Try changing it to MediaRecorder.AudioSource.MIC and it will work :

recorder.setAudioSource(MediaRecorder.AudioSource.MIC); 

Read this for more details.

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