android-recyclerview

问题 I have generic class public abstract class BaseAdapter<T> extends RecyclerView.Adapter { private List<T> itemsList = new ArrayList<>(); //other override methods @Override public long getItemId(int position) { return position; } } What is the correct way to implementing getItemId()? I think that return position like in many example is not correct. 回答1: Create a base interface that has a method that returns a type long eg. interface BaseInterface{ long getId(); } Change abstract class

问题 I have implemented a horizontal scrollable RecyclerView . My RecyclerView uses a LinearLayoutManager , and the problem I am facing is that when I try to use scrollToPosition(position) or smoothScrollToPosition(position) or from LinearLayoutManager 's scrollToPositionWithOffset(position) . Neither works for me. Either a scroll call doesn't scroll to the desired location or it doesn't invoke the OnScrollListener . So far I have tried so many different combinations of code that I cannot post

问题 I have a RecyclerView and adapter. Now in that adapter, I'm inflating one row. In that row, there are one delete button and one progressbar. So what I'm doing is when user clicks on delete button, I make invisible that delete button, and make visible small progress bar in place of delete button from Adapter class. And also I'm sending position via listener to that attached activity, from that I'm calling AsyncTask. Now the problem is : When I got to know via AsyncTask that item is deleted, I

问题 I need to set the top margin on a RecyclerView programmatically, but I get this exception: java.lang.RuntimeException: Unable to resume activity java.lang.ClassCastException: android.view.ViewGroup$LayoutParams cannot be cast to android.support.v7.widget.RecyclerView$LayoutParams Here is my code: RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams)recyclerView.getLayoutParams(); int marginTopDp = (int)getResources().getDimension(R.dimen.margin); int marginTopPx = (int)

问题 Java 8, min SDK: 24, target SDK: 27 My app displays a map with some type of map marker (within a Fragment ) and if I click on one of these markers, a popup comes up to show some additional information about this marker. Currently I'm using a normal AlertDialog for that but I might replace it with a DialogFragment in the future. Inside the dialog there's a RecyclerView that is filled with multiple values. If I click on one of the rows, I want my app to open a "fold-out" underneath it (the

问题 I have this code and everytime I tried to run it ..the application is not running not error but not running can anyone please help me to determine what is the reason for getting this kind of problem. because I'm doing RecyclerView with CardView in fragment I have this problem almost a week :( this is my code: public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.MyViewHolder> { private Context mContext ; private List<Book> mData ; public RecyclerViewAdapter(Context

问题 Given an adapter like this: public class MyAdapter extends RecyclerView.Adapter { private final Activity mActivity; private final List<Item> mItemList; public MyAdapter(Activity activity, List<Item> itemList) { this.mActivity = activity; this.mItemList = itemList; } //[...] public void onBindViewHolder(ViewHolder holder, int position) { final Item i = mItemList.get(position); holder.launchButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { mActivity

问题 Given an adapter like this: public class MyAdapter extends RecyclerView.Adapter { private final Activity mActivity; private final List<Item> mItemList; public MyAdapter(Activity activity, List<Item> itemList) { this.mActivity = activity; this.mItemList = itemList; } //[...] public void onBindViewHolder(ViewHolder holder, int position) { final Item i = mItemList.get(position); holder.launchButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { mActivity

问题 I'm trying to pass the value in recyclerview item to another activity when we click the recyclerview item. Here I use the OnItemTouchListener . I retrieve data from JSON and parse it into ArrayList. I save 5 parameters. Title, ID, Rating, ReleaseDate, urlPoster, but right now i only show 2 parameters, Title, and image from urlposter. I want to pass the other parameters to another activity, but i can't find out how to do that. There's another question similar like this (Values from

问题 I'm trying to pass the value in recyclerview item to another activity when we click the recyclerview item. Here I use the OnItemTouchListener . I retrieve data from JSON and parse it into ArrayList. I save 5 parameters. Title, ID, Rating, ReleaseDate, urlPoster, but right now i only show 2 parameters, Title, and image from urlposter. I want to pass the other parameters to another activity, but i can't find out how to do that. There's another question similar like this (Values from