Question

当我启动设备并打开我的应用程序时，一切正常，但是在设备上使用另一个应用程序后，我的应用程序出现此错误。

public void startRecorder(){

    // Check if user has given permission to record audio
    int permissionCheck = ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.RECORD_AUDIO);
    if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.RECORD_AUDIO}, PERMISSIONS_REQUEST_RECORD_AUDIO);
        return;
    }
    if (mRecorder == null) {

        mRecorder = new MediaRecorder();
        mRecorder.setOutputFile("/dev/null");
        mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);


        try {
            mRecorder.prepare();
            mRecorder.start();
        } catch (java.io.IOException ioe) {
            mRecorder = null;
            android.util.Log.e("[Monkey]", "IOException: " + android.util.Log.getStackTraceString(ioe));

        } catch (java.lang.SecurityException e) {
            mRecorder = null;
            android.util.Log.e("[Monkey]", "SecurityException: " + android.util.Log.getStackTraceString(e));
        }

    }


}

10-08 10：32：42.260 18121-18121 / com.avatarmind.ipaldecibel E / ###：JNI_MOTIONSERVICE LOAD 10-08 10：32：42.260 18121-18121 / com.avatarmind.ipaldecibel E / ###：MotionService设置 10-08 10：32：42.526 18121-18121 / com.avatarmind.ipaldecibel E / MediaRecorder：启动失败：-38 10-08 10：32：42.529 18121-18121 / com.avatarmind.ipaldecibel E / AndroidRuntime：FATAL EXCEPTION：main 流程：com.avatarmind.ipaldecibel，PID：18121 java.lang.RuntimeException：无法恢复活动{com.avatarmind.ipaldecibel / com.avatarmind.ipaldecibel.MainActivity}：java.lang.IllegalStateException 在android.app.ActivityThread.performResumeActivity（ActivityThread.java:3173）在android.app.ActivityThread.handleResumeActivity（ActivityThread.java:3204）在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2548）在android.app.ActivityThread.-wrap12（ActivityThread.java）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1406）在android.os.Handler.dispatchMessage（Handler.java:102）在android.os.Looper.loop（Looper.java:148）在android.app.ActivityThread.main（ActivityThread.java:5509）在java.lang.reflect.Method.invoke（本机方法）在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:772）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:662）造成原因：java.lang.IllegalStateException 在android.media.MediaRecorder.start（本机方法）在com.avatarmind.ipaldecibel.MainActivity.startRecorder（MainActivity.java:300）在com.avatarmind.ipaldecibel.MainActivity.onResume（MainActivity.java:262）在android.app.Instrumentation.callActivityOnResume（Instrumentation.java:1258）在android.app.Activity.performResume（Activity.java:6342）在android.app.ActivityThread.performResumeActivity（ActivityThread.java:3162）在android.app.ActivityThread.handleResumeActivity（ActivityThread.java:3204）在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2548）在android.app.ActivityThread.-wrap12（ActivityThread.java）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1406）在android.os.Handler.dispatchMessage（Handler.java:102）在android.os.Looper.loop（Looper.java:148）在android.app.ActivityThread.main（ActivityThread.java:5509）在java.lang.reflect.Method.invoke（本机方法）在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:772） com.android.internal.os.ZygoteInit.main（ZygoteInit.java:662）

Answer 1

似乎在恢复应用程序并尝试调用mRecorder.start（）时，您处于非法状态。您的“活动”暂停时，您可能不释放MediaRecorder。

尝试下一个代码：

@Override
protected void onPause() {
    super.onPause();
    // if we are using MediaRecorder, release it first
    releaseMediaRecorder();
}

private void releaseMediaRecorder(){
    if (mMediaRecorder != null) {
        // clear recorder configuration
        mMediaRecorder.reset();
        // release the recorder object
        mMediaRecorder.release();
        mMediaRecorder = null;
    }
}

Answer 2

尝试使用，对于 21-30 api 就可以了

setOutputFormat(MediaRecorder.OutputFormat.AAC_ADTS)
setAudioEncoder(MediaRecorder.AudioEncoder.AAC)

MediaRecorder：java.lang.IllegalStateException，位于

2 个答案: