android-recyclerview

问题 I searched Lot about this problem but did not Find Exact Solution.My Problem is that if i select layout at some position to change the background it works fine but at the same time it also change background of other layout. example if i click on position 0 it also change to postion 9,19 means 0,9,19 here is my code RecyclerAdapter.java public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.myViewHolder> { Context mContext; private List<randomDatas> mData; static int count=0

问题 I searched Lot about this problem but did not Find Exact Solution.My Problem is that if i select layout at some position to change the background it works fine but at the same time it also change background of other layout. example if i click on position 0 it also change to postion 9,19 means 0,9,19 here is my code RecyclerAdapter.java public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.myViewHolder> { Context mContext; private List<randomDatas> mData; static int count=0

问题 I have a vertical scrolling ViewPager2 and the last children contains a RecyclerView scrolling on the same direction. This is causing a conflicting behaviour, the ViewPager2 always steal the scroll event when I am at the page containing this RecyclerView . The only way to make the scroll inside the RecyclerView is if I scroll really slow, if I make it fast, like a swipe event the ViewPager2 gets scrolled and changes the page. Currently I'm doing a fix that involves disabled the user

问题 I would like to check when smoothScrollToPosition has finished scrolling back to the first item of recyclerview . I tried doing it like this which only works while smoothScrollToPosition is still scrolling: recyclerView.getLayoutManager().smoothScrollToPosition(recyclerView,new RecyclerView.State(), 0); if (!recyclerView.getLayoutManager().isSmoothScrolling()) { Log.d(TAG, "Scrolling has ended."); } 回答1: I use onScrollStateChanged(RecyclerView recyclerView, int newState) method for tracking

问题 I'm using a RecyclerView to display a list of items that are retrieved from a database as Java objects. One of the fields in the object is the ID of the item in the database, so that further operations can be performed with it. My areContentsTheSame implementation compares various fields in the objects to determine if the contents of the item has changed. The problem is that sometimes when the data source is refreshed the ID of the item changes without the visible contents changing (i.e. the

问题 I am using recyclerview and suddenly getting a weird error. I have tried everything that i could. Even placed Breakpoint. but it does not reach anywhere. There is data in the arraylist. I have tried all the solution that is available on StackOverFlow. It still does not work and also the solution available are for ListView. I am using recycerview so I am unable to get the solution. There is no null value. My recycler adapter is as below: private class RecyclerAdapter extends RecyclerView

问题 I need to iterate through all the RadioGroups in my RecyclerView . Code i tried: for(int i=0;i<recyclerView.getAdapter().getItemCount();i++) { radioGroup = recyclerView.findViewHolderForAdapterPosition(i).itemView.findViewById(R.id.radio_group); } but findViewHolderForAdapterPosition(i) returns null for RadioGroups that are off screen and gives me a NullPointerException . How do i iterate through all of them? 回答1: RecyclerView views are created/destroyed as needed when you scroll. You cannot

问题 I am using SelectionTracker to implement a multiple selection RecyclerView. the select/unselect feature works as expected if I do it manually (Item is on the screen and I change its state by tapping) but if I try to unselect all items, some of which are off screen, using clearSelection method of selection tracker it only unselects the items which are currently visible on the screen. This is how I am building the SelectionTracker tracker = SelectionTracker.Builder<Long>( "mySelection",

问题 I am using SelectionTracker to implement a multiple selection RecyclerView. the select/unselect feature works as expected if I do it manually (Item is on the screen and I change its state by tapping) but if I try to unselect all items, some of which are off screen, using clearSelection method of selection tracker it only unselects the items which are currently visible on the screen. This is how I am building the SelectionTracker tracker = SelectionTracker.Builder<Long>( "mySelection",

问题 Why my Recycler view selecting wrong items along with exactly selected items that are clicked ? Image To Show Recycler View Problem I want to place RecyclerView in a pop up activity started on click event and RecycleView should change the background of selected items from view. I have used following code for Activity to make it pops up Pop Up Activity code DisplayMetrics metrics=new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(metrics); float width=metrics.widthPixels*8