更新:

好的，经过几天的测试和调试...我可以正常工作，但不是我想要的方式。

它之前崩溃的原因是因为在锁屏期间相机的“重新定位”，显然，经常崩溃。

一旦我强制它使用横向模式，它就可以工作了。但是，我不希望它使用横向模式；我希望它在纵向模式下工作。

代码直接取自 Android Studio 的示例(媒体 -> MediaRecorder)。该示例的代码在横向模式下工作，我不知道如何让它使用纵向模式，这样我才能避免重新定位，从而避免崩溃？

onPause、onResume 代码和堆栈跟踪中没有任何内容指向被调用的方法。

轻松复制:

1) 使用 Android Studio 获取 MediaRecord 示例应用 2) 在 list 中，将 android:screenOrientation="landscape"> 更改为 Portrait。 3) 该应用程序现在不会启动。

我添加了 mCamera.setDisplayOrientation(90)，同样的问题。

代码:

@TargetApi(Build.VERSION_CODES.HONEYCOMB)
private boolean prepareVideoRecorder(){

    // BEGIN_INCLUDE (configure_preview)
    mCamera = CameraHelper.getDefaultCameraInstance();

    // We need to make sure that our preview and recording video size are supported by the
    // camera. Query camera to find all the sizes and choose the optimal size given the
    // dimensions of our preview surface.
    Camera.Parameters parameters = mCamera.getParameters();
    List<Camera.Size> mSupportedPreviewSizes = parameters.getSupportedPreviewSizes();
    Camera.Size optimalSize = CameraHelper.getOptimalPreviewSize(mSupportedPreviewSizes,
            mPreview.getWidth(), mPreview.getHeight());

    // Use the same size for recording profile.
    CamcorderProfile profile = CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH);
    profile.videoFrameWidth = optimalSize.width;
    profile.videoFrameHeight = optimalSize.height;

    // likewise for the camera object itself.
    parameters.setPreviewSize(profile.videoFrameWidth, profile.videoFrameHeight);
    mCamera.setParameters(parameters);
    try {
            // Requires API level 11+, For backward compatibility use {@link setPreviewDisplay}
            // with {@link SurfaceView}
            mCamera.setPreviewTexture(mPreview.getSurfaceTexture());
    } catch (IOException e) {
        Log.e(TAG, "Surface texture is unavailable or unsuitable" + e.getMessage());
        return false;
    }
    // END_INCLUDE (configure_preview)

    // BEGIN_INCLUDE (configure_media_recorder)
    mMediaRecorder = new MediaRecorder();

    // Step 1: Unlock and set camera to MediaRecorder
    mCamera.unlock();
    mMediaRecorder.setCamera(mCamera);

    // Step 2: Set sources
    mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
    mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);

    // Step 3: Set a CamcorderProfile (requires API Level 8 or higher)
    mMediaRecorder.setProfile(profile);

    // Step 4: Set output file
    mMediaRecorder.setOutputFile(CameraHelper.getOutputMediaFile(
            CameraHelper.MEDIA_TYPE_VIDEO).toString());

    mMediaRecorder.setOrientationHint(90);
    // END_INCLUDE (configure_media_recorder)

    MediaScannerConnection.scanFile(this, new String[] { CameraHelper.getOutputMediaFile(
            CameraHelper.MEDIA_TYPE_VIDEO).getPath() }, new String[] { "video/mp4" }, null);
    // Step 5: Prepare configured MediaRecorder
    try {
        mMediaRecorder.prepare();
    } catch (IllegalStateException e) {
        Log.d(TAG, "IllegalStateException preparing MediaRecorder: " + e.getMessage());
        releaseMediaRecorder();
        return false;
    } catch (IOException e) {
        Log.d(TAG, "IOException preparing MediaRecorder: " + e.getMessage());
        releaseMediaRecorder();
        return false;
    }
    return true;
}

日志:

06-27 02:18:08.244  25734-25752/com.watchdawg.watchdawg E/MediaRecorder﹕ start failed: -22
06-27 02:18:08.253  25734-25752/com.watchdawg.watchdawg E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #1
Process: com.watchdawg.watchdawg, PID: 25734
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:304)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)
Caused by: java.lang.RuntimeException: start failed.
at android.media.MediaRecorder.start(Native Method)
at com.watchdawg.watchdawg.RecordActivity$MediaPrepareTask.doInBackground(RecordActivity.java:276)
at com.watchdawg.watchdawg.RecordActivity$MediaPrepareTask.doInBackground(RecordActivity.java:267)
at android.os.AsyncTask$2.call(AsyncTask.java:292)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)

最佳答案

每当从最近的任务列表中删除应用程序时，不会完全清理进程，只是清理 UI。因此，清理您的 Activity 或应用程序持有的资源是应用程序的责任。因此，您需要在您的服务(Android 服务)组件 中覆盖onTaskRemoved() 方法并执行清理(释放媒体播放器实例等)。

关于java - Android MediaRecorder 崩溃，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30952062/