摄影器材摄影

Question

在用于相机的应用程序中，我使用了 Fotoapparat版本2.4.0 库。该应用程序正在 Android 4.3 平台上进行测试 问题是第一次拍摄后，相机会停止拍照。

代码：

public class NewPostFragment extends Fragment implements View.OnClickListener {

    private CameraView mCameraView;

    private RecyclerView mPhotosRecyclerView;
    private PhotoRibbonAdapter mPhotoRibbonAdapter;

    private ImageButton mTakePhotoButton;
    private Toolbar toolbar;

    private Fotoapparat mFotoapparat;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
                             @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_new_post, container, false);

        LinearLayoutManager layoutManager = new LinearLayoutManager(getContext(), LinearLayoutManager.HORIZONTAL, false);

        mPhotosRecyclerView = view.findViewById(R.id.preview_photos);
        mCameraView = view.findViewById(R.id.camera_view);
        mTakePhotoButton = view.findViewById(R.id.take_photo_button);
        toolbar = view.findViewById(R.id.camera_toolbar);

        mTakePhotoButton.setOnClickListener(this);

        mPhotosRecyclerView.setLayoutManager(layoutManager);

        mPhotoRibbonAdapter = new PhotoRibbonAdapter();
        mPhotosRecyclerView.setAdapter(mPhotoRibbonAdapter);

        mFotoapparat = Fotoapparat
                           .with(getContext())
                           .into(mCameraView)
                           .build();

        return view;
    }


    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        ((AppCompatActivity)getActivity()).setSupportActionBar(toolbar);
    }

    @Override
    public void onResume() {
        super.onResume();

    }


    @Override
    public void onStart() {
        super.onStart();
        mFotoapparat.start();
    }

    @Override
    public void onClick(View view) {

        switch (view.getId()) {
            case R.id.take_photo_button :
            PhotoResult photoResult = mFotoapparat.takePicture();
            photoResult.toBitmap().whenDone(new WhenDoneListener<BitmapPhoto>() {
                @Override
                public void whenDone(@org.jetbrains.annotations.Nullable BitmapPhoto bitmapPhoto) {
                    //The second time, the bitmapPhoto parameter is null!
                    if (bitmapPhoto != null) {
                        mPhotoRibbonAdapter.add(bitmapPhoto.bitmap);
                        mPhotoRibbonAdapter.notifyDataSetChanged();
                    }

                }
            });

            break;

        }
    }

此外，我注意到在拍摄第一张照片后，相机和整个应用程序开始变慢。