在我的项目中,我正在使用一个
RecyclerView
来显示带有缩略图的项目列表。当用户单击某个项目时,会打开DetailView,在该视图中,图片显示在顶部。我正在尝试在这些片段之间共享一些元素,但只有在进入详细信息片段时才能正常工作,而返回时不行。
在我的ListAdapter
中,我设置了TransitionName
并在用户单击某个项目时通知了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<Pair<View, String>> sharedElements = new ArrayList<>();
sharedElements.add(new Pair<View, String>(image, (String) image.getTag()));
interactionListener.onItemSelected(data.get(getAdapterPosition() - headerItemCount).type, data.get(getAdapterPosition() - headerItemCount).itemId, sharedElements);
}
然后在ListFragment中,我启动了DetailFragment:
public void navigateToFragment(Fragment curFragment, Fragment nextFragment,
boolean addToBackStack, List<Pair<View, String>> 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<View, String> 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,在DetailFragment的onCreateView()
方法中,我设置了当前过渡名称(因为它取决于itemId):
ViewCompat.setTransitionName(header, Constants.SHARED_NAME_IMAGE + itemId);