在我的项目中，我使用RecyclerView来显示带有缩略图的项目列表。 当用户单击某个项目时，DetailView将被打开，图像显示在顶部。 我正在尝试在这些片段之间共享一些元素，但是过渡仅在输入明细片段时有效，而从其返回时不起作用。
在我的ListAdapter中，设置TransitionName并在用户单击项目时通知ListFragment：
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
viewHolder.image.setTag(Constants.SHARED_NAME_IMAGE + item.itemId);
}
点击事件：
@OnClick(R.id.root)
public void onClickedItem() {
List> sharedElements = new ArrayList<>();
sharedElements.add(new Pair(image, (String) image.getTag()));
interactionListener.onItemSelected(data.get(getAdapterPosition() - headerItemCount).type, data.get(getAdapterPosition() - headerItemCount).itemId, sharedElements);
}
然后在ListFragment中，我启动DetailFragment：
public void navigateToFragment(Fragment curFragment, Fragment nextFragment,
boolean addToBackStack, List> sharedElements) {
if (nextFragment == null) {
return;
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP && sharedElements != null && curFragment != null) {
// Setup transition on first fragment
curFragment.setSharedElementEnterTransition(TransitionUtil.getReturnTransition(this));
curFragment.setSharedElementReturnTransition(TransitionUtil.getEnterTransition(this));
curFragment.setEnterTransition(null);
curFragment.setExitTransition(null);
// Setup transition on second fragment
nextFragment.setSharedElementEnterTransition(TransitionUtil.getEnterTransition(this));
nextFragment.setSharedElementReturnTransition(TransitionUtil.getReturnTransition(this));
nextFragment.setEnterTransition(null);
nextFragment.setExitTransition(null);
// Add second fragment by replacing first
FragmentTransaction ft = getSupportFragmentManager()
.beginTransaction()
.replace(R.id.container, nextFragment);
if (addToBackStack) {
ft.addToBackStack("fragment");
}
for (Pair sharedElement : sharedElements) {
ViewCompat.setTransitionName(sharedElement.first, sharedElement.second);
ft.addSharedElement(sharedElement.first, sharedElement.second);
}
// Apply the transaction
ft.commit();
} else {
FragmentTransaction ft = getSupportFragmentManager()
.beginTransaction()
.replace(R.id.container, nextFragment);
if (addToBackStack) {
ft.addToBackStack("fragment");
}
ft.commit();
}
}
最后，我在DetailFragment的onCreateView()中设置当前的过渡名称(因为它取决于itemId)：
ViewCompat.setTransitionName(header, Constants.SHARED_NAME_IMAGE + itemId);
我刚刚解决了这个问题：有两个问题：
我已覆盖列表适配器(因此过渡名称已删除)
我尚未在onBindViewHolder中设置转换名称
为了解决1号问题，我像这样更改了setUpList(){...}(第一个如果重要的话！)：
private void setupList() {
if (adapter != null) {
list.setAdapter(adapter);
linearLayoutManager = new LinearLayoutManager(getActivity());
list.setLayoutManager(linearLayoutManager);
setScrollListener();
return;
}
refreshLayout.setColorSchemeColors(ResourcesCompat.getColor(getResources(), R.color.main_color_2, getActivity().getTheme()));
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
loadList(true);
}
});
adapter = new ListAdapter((int) (DisplayUtils.getWidth(getActivity()) * 0.6), this);
list.setAdapter(adapter);
linearLayoutManager = new LinearLayoutManager(getActivity());
list.setLayoutManager(linearLayoutManager);
refreshLayout.post(new Runnable() {
@Override
public void run() {
refreshLayout.setRefreshing(true);
loadFilterItems();
要解决＃2，我只是将setTag(..)替换为setTransitionName(..)
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
vh.image.setTransitionName(Constants.SHARED_NAME_IMAGE + item.itemId);
}
在我的onClick方法中：
List> sharedElements = new ArrayList<>();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
sharedElements.add(new Pair(image, image.getTransitionName()));
}
interactionListener.onItemSelected(data.get(getAdapterPosition() - headerItemCount).type, data.get(getAdapterPosition() - headerItemCount).itemId, sharedElements);