在我的应用程序中,我使用MediaRecorder捕获视频。 但是当我在应用程序录制时关闭屏幕时,生成的视频当时是黑色的。有没有办法防止这种情况并使相机继续记录?这是我的代码:
CameraManager manager = (CameraManager) getSystemService(CAMERA_SERVICE);
mMediaRecorder = new MediaRecorder();
outputFile = new File(dir, "temp");
try {
String[] ids = manager.getCameraIdList();
CameraCharacteristics characteristics = manager.getCameraCharacteristics(ids[0]);
StreamConfigurationMap configs = characteristics.get(
CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
Size[] sizes = configs.getOutputSizes(MediaCodec.class);
final Size sizeHigh = sizes[0];
manager.openCamera(ids[0], new CameraDevice.StateCallback() {
@Override
public void onOpened(CameraDevice camera) {
mCamera = camera;
mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE);
mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);
mMediaRecorder.setVideoSize(sizeHigh.getWidth(), sizeHigh.getHeight());
mMediaRecorder.setMaxFileSize(0);
try {
mMediaRecorder.setOutputFile(outputFile.getAbsolutePath());
mMediaRecorder.prepare();
List<Surface> list = new ArrayList<>();
list.add(mMediaRecorder.getSurface());
final CaptureRequest.Builder captureRequest = mCamera.createCaptureRequest(CameraDevice.TEMPLATE_RECORD);
captureRequest.addTarget(mMediaRecorder.getSurface());
mCaptureRequest = captureRequest.build();
mCamera.createCaptureSession(list, new CameraCaptureSession.StateCallback() {
@Override
public void onConfigured(CameraCaptureSession session) {
mSession = session;
mMediaRecorder.start();
try {
mSession.setRepeatingRequest(mCaptureRequest,
new CameraCaptureSession.CaptureCallback() {
@Override
public void onCaptureStarted(CameraCaptureSession session, CaptureRequest request, long timestamp, long frameNumber) {
super.onCaptureStarted(session, request, timestamp, frameNumber);
if(frameNumber > 2*60*25) {
mSession.stopRepeating();
mMediaRecorder.stop();
mSession=null;
mCamera.close();
}
}
@Override
public void onCaptureCompleted(CameraCaptureSession session, CaptureRequest request, TotalCaptureResult result) {
super.onCaptureCompleted(session, request, result);
}
}, null);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
@Override
public void onConfigureFailed(CameraCaptureSession session) {
mSession = session;
}
}, null);
} catch (Exception e) {
e.printStackTrace();
}