更新：
好的，经过几天的测试和调试……我成功了，但不是我想要的方式。
之前崩溃的原因是由于在锁屏期间相机的“重新定位”，这很容易导致崩溃。
一旦我强制它使用横屏模式，它就可以工作了。然而，我不想让它使用横屏模式；我想让它在竖屏模式下工作。
代码直接从Android Studio的示例（Media->MediaRecorder）中取得。示例中的代码在横屏模式下工作，我无法弄清楚如何使其在竖屏模式下工作，以避免重新定位和崩溃？
onPause、onResume中没有任何代码，堆栈跟踪也没有指向该方法被调用。
简单重现：
1）使用Android Studio获取MediaRecord示例应用程序
2）在清单中将android:screenOrientation="landscape">更改为Portrait。
3）应用程序现在无法启动。
我添加了mCamera.setDisplayOrientation(90)，但问题仍然存在。
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)