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我知道这个问题已经问了好几次了。但是我仍然找不到原因；他们都没有帮助解决这个问题。

我正在尝试使用 android MediaRecorder 录制音频剪辑并想要播放它。但是我在下面的代码行中得到了 IllegalStateException 。

recorder.start();

这是我的代码：

private void startRecording() {
    try {

        mFileName = Environment.getExternalStorageDirectory()
                .getAbsolutePath();
        mFileName += "/audio_recording.3gp";

        recorder = new MediaRecorder();

        recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
        // recorder.setOutputFile(fos.getFD()); 
        recorder.setOutputFile(mFileName);
        try {
            recorder.prepare();
            recorder.start();
        } catch (IllegalStateException e) {
            System.out.println("Error in preparing recorder!!! IllegelStateException");
        }catch (IOException e) {
            System.out.println("Error in preparing recorder!!!");
        }

    } catch (IOException e) {
        System.out.println("IOException caught during recording!!! IO Exception");
        e.printStackTrace();
    }

}

错误日志：

02-17 19:09:40.086: E/AndroidRuntime(25620): FATAL EXCEPTION: main
02-17 19:09:40.086: E/AndroidRuntime(25620): java.lang.IllegalStateException: Could not execute method of the activity
02-17 19:09:40.086: E/AndroidRuntime(25620):    at android.view.View$1.onClick(View.java:3103)
02-17 19:09:40.086: E/AndroidRuntime(25620):    at android.view.View.performClick(View.java:3574)
02-17 19:09:40.086: E/AndroidRuntime(25620):    at android.view.View$PerformClick.run(View.java:14293)
02-17 19:09:40.086: E/AndroidRuntime(25620):    at android.os.Handler.handleCallback(Handler.java:605)
02-17 19:09:40.086: E/AndroidRuntime(25620):    at android.os.Handler.dispatchMessage(Handler.java:92)
02-17 19:09:40.086: E/AndroidRuntime(25620):    at android.os.Looper.loop(Looper.java:137)
02-17 19:09:40.086: E/AndroidRuntime(25620):    at android.app.ActivityThread.main(ActivityThread.java:4448)
02-17 19:09:40.086: E/AndroidRuntime(25620):    at java.lang.reflect.Method.invokeNative(Native Method)
02-17 19:09:40.086: E/AndroidRuntime(25620):    at java.lang.reflect.Method.invoke(Method.java:511)
02-17 19:09:40.086: E/AndroidRuntime(25620):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)
02-17 19:09:40.086: E/AndroidRuntime(25620):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
02-17 19:09:40.086: E/AndroidRuntime(25620):    at dalvik.system.NativeStart.main(Native Method)
02-17 19:09:40.086: E/AndroidRuntime(25620): Caused by: java.lang.reflect.InvocationTargetException
02-17 19:09:40.086: E/AndroidRuntime(25620):    at java.lang.reflect.Method.invokeNative(Native Method)
02-17 19:09:40.086: E/AndroidRuntime(25620):    at java.lang.reflect.Method.invoke(Method.java:511)
02-17 19:09:40.086: E/AndroidRuntime(25620):    at android.view.View$1.onClick(View.java:3098)
02-17 19:09:40.086: E/AndroidRuntime(25620):    ... 11 more
02-17 19:09:40.086: E/AndroidRuntime(25620): Caused by: java.lang.RuntimeException: start failed.
02-17 19:09:40.086: E/AndroidRuntime(25620):    at android.media.MediaRecorder.start(Native Method)
02-17 19:09:40.086: E/AndroidRuntime(25620):    at com.example.audiorecordtest.MainActivity.startRecording(MainActivity.java:146)
02-17 19:09:40.086: E/AndroidRuntime(25620):    at com.example.audiorecordtest.MainActivity.onRecord(MainActivity.java:94)
02-17 19:09:40.086: E/AndroidRuntime(25620):    at com.example.audiorecordtest.MainActivity.onSayButtonClick(MainActivity.java:66)
02-17 19:09:40.086: E/AndroidRuntime(25620):    ... 14 more

我也声明了所需的权限。

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

我该如何解决这个问题？

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