android-recyclerview

问题 I have an adapter class for recyclerview: public abstract class RecyclerViewArrayAdapter<T, VH extends RecyclerView.ViewHolder> extends RecyclerView.Adapter<VH> { ... } I am creating an object like this : new RecyclerViewArrayAdapter<String, ListImageItemViewHolder>(emailAddresses) { @Override public ListImageItemViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.item, parent, false); return new

问题 I want to retain the state of the RecyclerView's selected item whenever the screen orientation changes, but whenever I change the orientation, the selected item does not retain its state. So I save the position of the selected item and on orientation change in onResume() . I get the position and by using the RecyclerView's getChildAt() method I try to get the View of that item, but it returns null. I am in serious troubles, please help. @Override protected void onCreate(Bundle

问题 I would like to create a recycler view with a fixed first row, which should act as the header. Also ,how can I prevent it from scrolling with other row elements ? 回答1: Don't put your fixed header in the RecyclerView . Wrap the RecyclerView in a vertical LinearLayout , with your fixed header above it. 来源： https://stackoverflow.com/questions/30873176/recylerview-with-a-fixed-first-row-as-header

问题 I am using GridLayoutManager with recyclerview, when i fast scroll down one item out of four visible grid items (bottom right ) is moved further down, I am using this tutorial to implement fast scroll and fast scroll indicator here 回答1: Guess i've found the solution. Looks like when the Recycled Views are attached to the Window again, their state is changed to Invisible (IDK why). All we have to do is make it visible again. Fortunately, RecyclerView.Adapter class has a method to handle when a

问题 I am using a recyclerView to display a list of items that can be deleted when user clicks on delete button of each item. In order to do that, i've used a recyclerview adapter. What i want: From that recycleView adapter, when user clicks on delete button for an item, a dialog fragment is shown and user has to enter a code when that code is valid then the item is removed from both the database and the recyclerView What i've tried: After calling the show() method on the dialogFragment in the

问题 I am working where I have checkboxe inside RecyclerView items. I am aware of some of its issues. But, with only 10 items and no scrolling wrong listener is called. I have something like this: private class MyAdapter extends RecyclerView.Adapter<MyViewHodler> { ArrayList<String> items; ArrayList<String> checkedList = new ArrayList<>(); ... public void onBindViewHolder(final MyViewHolder holder, int position) { String item = items.get(position); String check = checkedList.get(item); if(check !=

问题 I am trying to implement a CardView flip in a RecyclerView. I just cannot figure out a simple solution. I have a working CardView where i can display a list of card using the recycler view. The problem is, how to show the back of the card if user click the card. I want to use animation and change the front of the card to the back of the card. Can someone give a simple animation and example of the card layout. My current example is pretty much copy of this example where a new activity is being

问题 Can the RecyclerView.ViewHolder be used not as a inner class? Are there any issues on doing so? I have searched around but havent found any documentation on it! 回答1: Actually, I think a ViewHolder should either be a static nested class (mind the static!) or a top-level class (which actually will be no different, just the class name will contains the outer class name followed by a $ and then the inner class name). Why do I think so? When the ViewHolder is a non-static inner class of the

问题 I have a requirement that need to drag an item from one recyclerview into another recyclerview. I found some some of the useful resource as with the help of ItemTouchHelper Also find a library to drag and drop in android here. While implementation, am able to drag the item view along with the pointer(finger) on the screen, but not able success to achieve my requirement. Please share me if you have any previous experience on this. 回答1: For multiple list view drag and drop you can refer this

问题 I am create and using custom RecyclerView in my application. I need to call getChildAt(0).getWidth() before any working to save first item width in class field. For that I need to catch when data loading in adapter (otherwise getChildAt(0) will returns null). How to catch data loading event inside custom RecyclerView? 回答1: RecyclerView is already calling registerAdapterDataObserver and it's unregister counterpart on the adapter the supplied adapter. This observer have several callbacks to let