當試圖在LG G手錶上錄製音頻時，MediaRecorder引發「java.lang.RuntimeException：啓動失敗：-2147483648」

我試圖在LG G手錶上的應用程序中錄製音頻。以下代碼在語句「recorder.start（）;」中拋出帶有「啓動失敗：-2147483648」消息的RuntimeException。想知道我在這裏做錯了什麼。當試圖在LG G手錶上錄製音頻時，MediaRecorder引發「java.lang.RuntimeException：啓動失敗：-2147483648」

我已經嘗試了許多不同的組的參數的，例如用於的AudioSource：

recorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT); 
//-and- 
recorder.setAudioSource(MediaRecorder.AudioSource.MIC);

同樣對於OUTPUTFORMAT我試圖

recorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT); 
//-and- 
recorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4); 
//-and- 
recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);

也試過不同AudioEncoder

recorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT); 
//-and- 
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

這是源代碼：

  final MediaRecorder recorder = new MediaRecorder(); 
      recorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT); 
      recorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT); 
      recorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT); 
      //recorder.setAudioSamplingRate(8000); // tried with and without this line 
      String filename = mMainActivity.getExternalFilesDir(null) + "/my_recording.mp4"; // changed to corresponding extension name for the output format 
      Log.d("DEBUG", "Output filename = " + filename); 
      recorder.setOutputFile(filename); 
      try { 
       recorder.prepare(); 
      } 
      catch (IOException e) { 
       Log.d("DEBUG", "IOException while prepare(): " + e.getMessage()); 
      } 
      try { 
       Thread.sleep(1000); 
      } catch (InterruptedException e) { 
       Log.d("DEBUG", "InterruptedException while Thread.sleep(): " + e.getMessage()); 
      } 
      Log.d("DEBUG", "before start"); 
      try { 
       recorder.start(); // <--- exception is thrown here 
      } 
      catch (IllegalStateException e) { 
       Log.d("DEBUG", "IllegalStateException while start(): " + e.getMessage()); 
      } 
      Log.d("DEBUG", "after start");

------------ EDIT --------------------

這裏是logcat的輸出：

09-22 01:33:10.697 8764-8764/com.company.project D/DEBUG﹕ Output filename = /storage/emulated/0/Android/data/com.company.project/files/my_recording.mp4 
09-22 01:33:11.697 8764-8764/com.company.project D/DEBUG﹕ before start 
09-22 01:33:11.707 8764-8764/com.company.project E/MediaRecorder﹕ start failed: -2147483648 
09-22 01:33:11.707 8764-8764/com.company.project D/AndroidRuntime﹕ Shutting down VM 
09-22 01:33:11.707 8764-8764/com.company.project W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0xada14d70) 
09-22 01:33:11.737 8764-8764/com.company.project E/AndroidRuntime﹕ FATAL EXCEPTION: main 
Process: com.company.project, PID: 8764 
java.lang.RuntimeException: start failed. 
     at android.media.MediaRecorder.start(Native Method) 
     at com.company.project.MainActivity$1.onLayoutInflated(MainActivity.java:56) 
     at android.support.wearable.view.WatchViewStub.inflate(WatchViewStub.java:133) 
     at android.support.wearable.view.WatchViewStub.onMeasure(WatchViewStub.java:141) 
     at android.view.View.measure(View.java:16648) 
     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125) 
     at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
     at android.view.View.measure(View.java:16648) 
     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125) 
     at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
     at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2338) 
     at android.view.View.measure(View.java:16648) 
     at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1959) 
     at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1145) 
     at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1396) 
     at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1032) 
     at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5657) 
     at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761) 
     at android.view.Choreographer.doCallbacks(Choreographer.java:574) 
     at android.view.Choreographer.doFrame(Choreographer.java:544) 
     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747) 
     at android.os.Handler.handleCallback(Handler.java:733) 
     at android.os.Handler.dispatchMessage(Handler.java:95) 
     at android.os.Looper.loop(Looper.java:136) 
     at android.app.ActivityThread.main(ActivityThread.java:5026) 
     at java.lang.reflect.Method.invokeNative(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:515) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602) 
     at dalvik.system.NativeStart.main(Native Method) 
09-22 01:33:11.777 8764-8764/com.company.project I/Process﹕ Sending signal. PID: 8764 SIG: 9

注：我在我的清單以下權限：

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

我的環境是：

SDK: API 20: Android 4.4 (KitKat Wear) 
Build tool: 19.1.0 
Android Studio: 0.8.9

來源

2014-09-22 Roy

順便說一句，同樣的代碼工作不行了一臺Nexus 5，所以我有點相信這是因爲LG G （或一般的Android Wear）不喜歡參數或類似的東西。 – Roy 2014-09-22 19:12:46

您無法在Android Wear中使用MediaRecorder，只能使用AudioRecord。這裏YouTube視頻，其中谷歌開發者談論語音識別它們是如何錄製音頻：

https://www.youtube.com/watch?v=sha_w3_5c2c#t=1970

來源

2014-10-03 10:55:39 Alex

任何官方聲明明確排除MediaRecord的可能性？ – njzk2 2014-10-25 18:52:23

當試圖在LG G手錶上錄製音頻時，MediaRecorder引發「java.lang.RuntimeException：啓動失敗：-2147483648」

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