MediaRecorder在启动时崩溃

Question

我搜索了很多主题，但没有直接的答案。

我有这段代码：

        recorder = new MediaRecorder();
    recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);

    recorder.setOutputFile(mFileName);
    recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    if(!mStartRecording)
    {
        btn.setText("Stop Recording");
        try {
            recorder.prepare();

        }  catch (IOException e) {
            e.printStackTrace();
        }
        recorder.start();
        mStartRecording = true;
    }
    else
    {
        btn.setText("Start Recording");
        mStartRecording = false;
        recorder.stop();
        recorder.reset();
        recorder.release();

        recorder = null;
    }

我已添加:

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

我在某处看到添加 STORAGE 可以解决它，但对我没有用。

我正在 API Level 7 (Android 2.1) 上进行开发。

堆栈跟踪显示“启动失败”。 堆栈跟踪：

    04-26 19:27:41.955: D/dalvikvm(890): GC freed 809 objects / 58272 bytes in 433ms
04-26 19:27:44.772: D/dalvikvm(890): GC freed 95 objects / 3936 bytes in 371ms
04-26 19:28:54.973: E/MediaRecorder(890): start failed: -1
04-26 19:28:54.993: D/AndroidRuntime(890): Shutting down VM
04-26 19:28:54.993: W/dalvikvm(890): threadid=3: thread exiting with uncaught exception (group=0x4001b188)
04-26 19:28:54.993: E/AndroidRuntime(890): Uncaught handler: thread main exiting due to uncaught exception
04-26 19:28:55.105: E/AndroidRuntime(890): java.lang.IllegalStateException: Could not execute method of the activity
04-26 19:28:55.105: E/AndroidRuntime(890):  at android.view.View$1.onClick(View.java:2031)
04-26 19:28:55.105: E/AndroidRuntime(890):  at android.view.View.performClick(View.java:2364)
04-26 19:28:55.105: E/AndroidRuntime(890):  at android.view.View.onTouchEvent(View.java:4179)
04-26 19:28:55.105: E/AndroidRuntime(890):  at android.widget.TextView.onTouchEvent(TextView.java:6541)
04-26 19:28:55.105: E/AndroidRuntime(890):  at android.view.View.dispatchTouchEvent(View.java:3709)
04-26 19:28:55.105: E/AndroidRuntime(890):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
04-26 19:28:55.105: E/AndroidRuntime(890):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
04-26 19:28:55.105: E/AndroidRuntime(890):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
04-26 19:28:55.105: E/AndroidRuntime(890):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
04-26 19:28:55.105: E/AndroidRuntime(890):  at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1659)
04-26 19:28:55.105: E/AndroidRuntime(890):  at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1107)
04-26 19:28:55.105: E/AndroidRuntime(890):  at android.app.Activity.dispatchTouchEvent(Activity.java:2061)
04-26 19:28:55.105: E/AndroidRuntime(890):  at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643)
04-26 19:28:55.105: E/AndroidRuntime(890):  at android.view.ViewRoot.handleMessage(ViewRoot.java:1691)
04-26 19:28:55.105: E/AndroidRuntime(890):  at android.os.Handler.dispatchMessage(Handler.java:99)
04-26 19:28:55.105: E/AndroidRuntime(890):  at android.os.Looper.loop(Looper.java:123)
04-26 19:28:55.105: E/AndroidRuntime(890):  at android.app.ActivityThread.main(ActivityThread.java:4363)
04-26 19:28:55.105: E/AndroidRuntime(890):  at java.lang.reflect.Method.invokeNative(Native Method)
04-26 19:28:55.105: E/AndroidRuntime(890):  at java.lang.reflect.Method.invoke(Method.java:521)
04-26 19:28:55.105: E/AndroidRuntime(890):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
04-26 19:28:55.105: E/AndroidRuntime(890):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
04-26 19:28:55.105: E/AndroidRuntime(890):  at dalvik.system.NativeStart.main(Native Method)
04-26 19:28:55.105: E/AndroidRuntime(890): Caused by: java.lang.reflect.InvocationTargetException
04-26 19:28:55.105: E/AndroidRuntime(890):  at shibby.whisper.WhisperGameActivity.recordAudio(WhisperGameActivity.java:94)
04-26 19:28:55.105: E/AndroidRuntime(890):  at java.lang.reflect.Method.invokeNative(Native Method)
04-26 19:28:55.105: E/AndroidRuntime(890):  at java.lang.reflect.Method.invoke(Method.java:521)
04-26 19:28:55.105: E/AndroidRuntime(890):  at android.view.View$1.onClick(View.java:2026)
04-26 19:28:55.105: E/AndroidRuntime(890):  ... 21 more
04-26 19:28:55.105: E/AndroidRuntime(890): Caused by: java.lang.RuntimeException: start failed.
04-26 19:28:55.105: E/AndroidRuntime(890):  at android.media.MediaRecorder.start(Native Method)
04-26 19:28:55.105: E/AndroidRuntime(890):  ... 25 more
04-26 19:28:55.223: I/dalvikvm(890): threadid=7: reacting to signal 3
04-26 19:28:55.335: I/dalvikvm(890): Wrote stack trace to '/data/anr/traces.txt'
04-26 19:28:57.123: I/Process(890): Sending signal. PID: 890 SIG: 9

请帮忙。

- eric.itzhak

---

我尝试通过 CMD，但没有成功。很抱歉，我是新手。 - eric.itzhak

adb pull /data/anr/traces.txt。抱歉。 - Snicolas

"adb" 不被识别为内部或外部命令，也不是可运行的程序或批处理文件。 - eric.itzhak

你确定没有其他待处理的录音吗？ - Snicolas

让我们在聊天中继续这个讨论：http://chat.stackoverflow.com/rooms/10572/discussion-between-snicolas-and-eric-itzhak - Snicolas

Answer 1

好的，我明白了。我猜你将mStartRecording初始化为true。

因此你的if语句进入了else块。在其中，你停止了一个全新的MediaRecorder实例，而状态图不允许这样做。

将你的媒体记录器作为类的一个字段。并将你的mStartRecording布尔变量正确地初始化为false。只有在你的字段为空时才重新实例化你的媒体记录器。

if( recorder == null ) {
   recorder = new MediaRecorder();
   recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
   recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);

   recorder.setOutputFile(mFileName);
   recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
}//if
if(!mStartRecording) {
    btn.setText("Stop Recording");
    try {
        recorder.prepare();
        recorder.start();
        mStartRecording = true;
    }  catch (IOException e) {
        e.printStackTrace();
    }//catch
} else {
    btn.setText("Start Recording");
    mStartRecording = false;
    recorder.stop();
    recorder.reset();
    recorder.release();
    recorder = null;
}//else

- Snicolas

---

抱歉我没有提到，我以为这是显而易见的。mStartRecording是false。 - eric.itzhak

尝试添加一些跟踪（Log.d）语句以查看程序的运行情况。它是否在if或else块中崩溃？ - Snicolas

mFileName = Environment.getExternalStorageDirectory().getAbsolutePath(); mFileName += "/audiorecordtest4.3gp"; 在onCreate方法中调用此代码。 - eric.itzhak

尝试在设备上运行，尝试创建文件并尝试不同的路径。 - Snicolas

如果您愿意，我可以聊一下这个问题。 - Snicolas

Answer 2

尝试将start函数放在与prepare函数相同的块中。也许有一个异常阻止了prepare的执行，直接进入start，从而导致IllegalStateException。

    recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    recorder.setOutputFormat(output_formats[currentFormat]);
    recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    recorder.setOutputFile(getFilename());


    try {
        recorder.prepare();
        recorder.start();
    } catch (IllegalStateException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

- Anurag Ramdasan

---

你的setoutputfile在setaudioencoder之后吗？尝试更改一下！ - Anurag Ramdasan

如果您的mstartrecording被初始化为true，可能会出现错误。它被初始化为false了吗？ - Anurag Ramdasan

你是在模拟器上操作吗？可能是SD卡问题。你尝试在设备上运行了吗？ - Anurag Ramdasan

我正在模拟器上运行。我已经启用了音频录制功能。虽然文档中提到模拟器不能做到这一点，但我读到它实际上是可以的。我还将模拟器设置为100MB的SD卡。 - eric.itzhak

Answer 3

我正在使用以下代码，它对我非常有效。

protected void startRecording() {
    // TODO Auto-generated method stub
    i++;
     mFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
     mFileName += "/audiorecordtest"+i+".3gp";
    recorder = new MediaRecorder();

    recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
    recorder.setOutputFile(mFileName);
    recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

      try {
        recorder.prepare();
    } catch (IllegalStateException e) {
        // TODO Auto-generated catch block
        Toast.makeText(getApplicationContext(), "IllegalStateException called", Toast.LENGTH_LONG).show();


    } catch (IOException e) {
        // TODO Auto-generated catch block
        Toast.makeText(getApplicationContext(), "prepare() failed", Toast.LENGTH_LONG).show();

    }

      recorder.start();
}

 private void stopRecording() {
     recorder.stop();
     recorder.release();
     recorder = null;
    }

- minesh..

Answer 4

这些方法必须安排其运行顺序。在这里：

recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
recorder.setOutputFile(mFileName);
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

- Hati

Answer 5

只有在准备好的情况下才尝试启动您的录音机：

    try {
        recorder.prepare();
        recorder.start();
        mStartRecording = true;
    }  catch (IOException e) {
        Log.e( LOG_TAG, "Error when preparing or starting recorder", e);
    }

- Snicolas

Answer 6

我曾经遇到同样的问题，因为我的SurfaceView被设置为不可见。所以请将其设置为可见。

  mSurfaceView.setVisibility(View.VISIBLE);

- Pir Fahim Shah

Answer 7

我曾经遇到过同样的问题。这是因为在设置录制音频的文件名时，我错过了一个斜杠。

更改

this.fileName = Environment.getExternalStorageDirectory().getAbsolutePath();
this.fileName += "yourfilename.3gp";

到

this.fileName = Environment.getExternalStorageDirectory().getAbsolutePath();
this.fileName += "/yourfilename.3gp";

- romeo14

Answer 8

必须先调用 setOutputFile() 方法，然后再调用其他方法。

并且在所有操作之前必须创建文件。

- Ali Bagheri

---

这不正确。根据文档，首先应选择源类型，然后决定输出格式，最后设置其余属性。 - Mehmet Sedat Güngör