我有两个片段:片段1包含RecyclerView和片段2包含所选项目的详细视图。这两个片段之间有一个共享元素ImageView。当从片段1转换到片段2时,我希望看到标准的共享元素过渡效果,但是在RecyclerView中似乎无法工作。因为如果我在第一个片段中只使用另一个单独的视图,而不是RecyclerView,则会展示正确的过渡效果。请注意,我已为RecyclerView项图像分配基于位置的唯一过渡名称。
以下是代码:
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());
secondFragment.setId(imgDummy2.getTransitionName());
trans.addSharedElement(imgDummy2, imgDummy2.getTransitionName());
那么我就可以看到imgDummy2图像过渡得很好,可能是因为它在recyclerview之外。
有什么办法可以在recyclerview内也实现同样的效果吗?