活动重新创建后还原侦听器(将照片传递到从相机返回的自定义视图)

我有一个带有片段的活动。在一个片段中,我有两个自定义视图。自定义视图包含 ImageView 还有一个听众。侦听器可以转换、在ImageView中显示照片并上载照片。

我想从相机中拍摄一张照片,将其返回片段,通过侦听器传递到视图(然后在视图中显示并上传)。一切正常,直到摄像机可见后活动被破坏。所以,从相机回来后,我恢复了碎片,把照片放进去 onActivityResult 并尝试通过侦听器传递到视图。但听众是 null ,我不知道它附加到什么视图。

如何在重新创建活动后将照片传递给视图?

侦听器:

public interface Listener {
    void onPhotoObtained(@Nullable Uri uri);
}

自定义视图:

public class CustomView extends RelativeLayout implements Listener {
    @BindView(R.id.imageview) ImageView image;

    private PhotoManager photoManager;

    public void setPhotoManager(@NonNull PhotoManager photoManager) {
        this.photoManager = photoManager;
    }

    @Override
    public void onPhotoObtained(@Nullable Uri uri) {
        // transform and show image
    }

    @OnClick(R.id.imageview)
    void onPhotoButtonClicked() {
        photoManager.requestPhoto(this);
    }
}

片段:

public class MainFragment extends Fragment implements PhotoManager {

    @BindView(R.id.view1) CustomView view1;
    @BindView(R.id.view2) CustomView view2;

    // A list of listeners to communicate with custom views.
    // When a user clicks an ImageView, this fragment starts a camera to obtain a photo.
    private SparseArray<Listener> listeners;
    private int lastRequestId;
    private Uri uri;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        view = inflater.inflate(R.layout.fragment_main, container, false);
        binder = ButterKnife.bind(this, view);

        listeners = new SparseArray<>();
        if (savedInstanceState == null) {
            lastRequestId = 0;
            uri = null;
        } else {
            lastRequestId = savedInstanceState.getInt(BUNDLE_REQUEST_ID);
            uri = savedInstanceState.getParcelable(BUNDLE_KEY_URI);
            // How to create a listener list?
        }

        view1.setPhotoManager(this);
        view2.setPhotoManager(this);

        return view;
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == ReceivingPhotoDialogFragment.CAMERA_REQUEST) {
            if (resultCode == RESULT_OK) {
                if (uri != null) {
                    // listeners become empty after fragment reinitialization
                    Listener listener = listeners.get(lastRequestId);
                    if (listener != null)
                        listener.onPhotoObtained(uri);
                }
            }
        }
    }

    @Override
    public void onSaveInstanceState(@NonNull Bundle outState) {
        bundle.putInt(BUNDLE_REQUEST_ID, lastRequestId);
        bundle.putParcelable(BUNDLE_KEY_URI, uri);
        super.onSaveInstanceState(outState);
    }

    @Override
    public void requestPhoto(@NonNull Listener listener) {
        listeners.put(++lastRequestId, listener);

        // Request new photo with lastRequestId
        showCamera(lastRequestId);
    }

    private void showCamera(int requestId) {
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        if (intent.resolveActivity(getContext().getPackageManager()) != null) {
            File file = null;
            try {
                file = createImageFile();
            } catch (IOException e) {
                e.printStackTrace();
            }
            uri = null;
            if (file != null) {
                uri = Uri.fromFile(file);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
                intent.putExtra(BUNDLE_REQUEST_ID, requestId);
                startActivityForResult(intent, CAMERA_REQUEST);
            }
        }
    }

    private File createImageFile() throws IOException {
        // Create an image file name
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.getDefault()).format(new Date());
        File storageDir = getContext().getExternalFilesDir(Environment.DIRECTORY_PICTURES);
        return File.createTempFile(timeStamp, ".jpg", storageDir);
    }
}

要首先初始化的第二个侦听器:

public interface PhotoManager {
    void requestPhoto(@NonNull Listener listener);
}