Android在具有recyclerview和详细信息视图的片段之间共享元素转换

Question

我有2个片段:片段1包含recyclerview和片段2,其中包含所选项目的详细视图.这两个片段之间存在共享元素图像视图.在从片段1转换到2时,我希望看到标准的共享元素转换效果,但它似乎不适用于recyclerview.因为如果我在第一个片段中使用另一个单独的视图而不是recyclerview,它会表现出适当的过渡.请注意,我已将基于位置的唯一转换名称分配给recyclerview项目图像.

代码如下:MyActivity.java

public class MyActivity extends Activity {

private static final String TAG = MyActivity.class.getSimpleName();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_my);
    if (savedInstanceState == null) {
        getFragmentManager().beginTransaction()
                .add(R.id.main_container, new PlaceholderFragment())
                .commit();
    }
}

public static class ImageAdapter extends RecyclerView.Adapter<ImageAdapter.ViewHolder> {
    public interface OnItemClickListener {
        void onItemClick(View view, int position);
    }

    private OnItemClickListener mItemClickListener;

    List<Integer> items = new ArrayList<Integer>();
    public void setOnItemClickListener(OnItemClickListener listener) {
        this.mItemClickListener = listener;
    }


    public ImageAdapter() {
        items.add(1);
        items.add(1);
        items.add(1);
        items.add(1);
        items.add(1);
        items.add(1);
        items.add(1);
        items.add(1);
        items.add(1);
        items.add(1);
        items.add(1);
        items.add(1);
        items.add(1);
        items.add(1);
        items.add(1);
        items.add(1);
        items.add(1);
        items.add(1);
    }

    @Override
    public ImageAdapter.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item, null);
        ViewHolder viewHolder = new ViewHolder(view);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(ViewHolder viewHolder, final int i) {
        viewHolder.container.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View view) {
                if (mItemClickListener != null) {
                    mItemClickListener.onItemClick(view, i);
                }
            }
        });
        viewHolder.imgDummy.setTransitionName("test" + i);
    }

    @Override
    public int getItemCount() {
        return items.size();
    }

    public static class ViewHolder extends RecyclerView.ViewHolder {
        public View container;
        public View imgDummy;

        public ViewHolder(View itemView) {
            super(itemView);
            container = itemView.findViewById(R.id.container);
            imgDummy = itemView.findViewById(R.id.imgDummy);
        }
    }
}
/**
 * A placeholder fragment containing a simple view.
 */
@SuppressLint("ValidFragment")
public class PlaceholderFragment extends Fragment {

    private RelativeLayout.LayoutParams lp;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_my, container, false);
        final View imgDummy2 = rootView.findViewById(R.id.imgDummy2);
        imgDummy2.setTransitionName("test");

        RecyclerView list = (RecyclerView) rootView.findViewById(R.id.streams_list);
        list.setLayoutManager(new LinearLayoutManager(getActivity()));
        ImageAdapter adapter = new ImageAdapter();
        adapter.setOnItemClickListener(new ImageAdapter.OnItemClickListener() {
            @Override
            public void onItemClick(View view, int position) {                  
                View imgDummy = view.findViewById(R.id.imgDummy);

                SecondFragment secondFragment = new SecondFragment();
                secondFragment.setSharedElementEnterTransition(TransitionInflater.from(getActivity()).inflateTransition(R.transition.trans_move));

                secondFragment.setId(imgDummy.getTransitionName());
                android.app.FragmentTransaction trans = getFragmentManager().beginTransaction();
                trans.replace(R.id.main_container, secondFragment);
                trans.addToBackStack(null);
                trans.addSharedElement(imgDummy, imgDummy.getTransitionName());
                trans.commit();
            }
        });
        list.setAdapter(adapter);

        return rootView;
    }
}

public static class SecondFragment extends Fragment {
    private String mId;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.second_fragment, container, false);
        rootView.findViewById(R.id.imgDummy).setTransitionName(mId);
        return rootView;
    }

    public void setId(String id) {
        mId = id;
    }
}
}

如果我改变以下两行:

secondFragment.setId(imgDummy.getTransitionName());
trans.addSharedElement(imgDummy, imgDummy.getTransitionName());

通过

secondFragment.setId(imgDummy2.getTransitionName());
trans.addSharedElement(imgDummy2, imgDummy2.getTransitionName());

然后我可以看到imgDummy2图像正确转换,可能因为它不在recyclerview之内.

任何想法我怎样才能在recyclerview中应用相同的内容？

Answer 1

我知道已经晚了。但一直在努力解决这个问题，最终得到了从片段 A 中的回收器视图到片段 B 的过渡动画。

尝试在下面的行中更改 imgDummy.getTransitionName())

    trans.addSharedElement(imgDummy, imgDummy.getTransitionName());

到fragmentB中ImageView的转换名称