java - 在回调监听器中设置 imageview 位图

Question

所以我有一个从 MainFragment 调用的 CameraFragment。问题是我正在使用自定义监听器将图像数据传递给 MainFragment.java。这是我调用 CameraFragment.java 的方式

在 MainFragment.java 中:

public static class MainFragment extends Fragment implements CameraFragment.CameraFragmentHolder.CameraListener {

    ImageView mImageView;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.fragment_main, container, false);
        mImageView = (ImageView) rootView.findViewById(R.id.image_view);

        return rootView;
    }
    private OnClickListener onCameraFragmentClicked = new OnClickListener() {

        @Override
        public void onClick(View v) {
            FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction();
            fragmentTransaction.replace(R.id.container, CameraFragment.CameraFragmentHolder.newInstance(MainFragmentHolder.this, 0, false));
            fragmentTransaction.addToBackStack(null);
            fragmentTransaction.commit();
        }
    };



    @Override
    public void onImageSaved(byte[] data) {
        if (data != null) {
            Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);

            mImageView.setImageBitmap(bitmap);
        }
    } else {
        Log.v(TAG, "Didn't get any result");
    }
    }
}

然后在 CameraFragment.java 中实现以下内容:

相机 fragment .java

private byte[] mCameraData;
private CameraListener mListener;

public interface CameraListener {
    public void onImageSaved(byte[] data);
}

private OnClickListener mDoneButtonClickListener = new OnClickListener() {

    @Override
    public void onClick(View v) {
        if (mCameraData != null) {
            removeCameraView();
            sendImageDataToListener();

        } else {
            mCamera = null;
            removeCameraView();
        }
    }
};

//Send image back to Listener
private void sendImageDataToListener() {
    if (mCameraData != null) {
        mListener.onImageSaved(mCameraData);
    } else {
        Log.v("CAMERA IMAGE ERROR:", "NO IMAGE DATA");
    }
}

private void removeCameraView() {
    getActivity().getSupportFragmentManager().popBackStack();
}

我的问题出在 CallBackListener 的 MainFragment 中，当我尝试设置 ImageBitmap 时没有任何反应。

Answer 1

所以@Selvin 这实际上是可能的。我所做的是 onViewStateRestored。我读了一下android API。这应该不会有任何问题，但我仍然对此持怀疑态度，因为我还没有完全测试它。我按如下方式修改了 MainFragment.java。

在 MainFragment.java 中:

    Bitmap cameraImage;

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

    if (cameraImage != null) {
        mImageView.setImageBitmap(cameraImage);
    }
}

@Override
public void onImageSaved(byte[] data) {
    if (data != null) {
        Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
        cameraImage = bitmap;
    }
} else {
    Log.v(TAG, "Didn't get any result");
}