For Home fragment, I use a ProgressBar in in RecyclerView.Adapter. When the App starts everything render without problem. But when I come back from the other fragment with this code:
Navigation.findNavController(view).navigate(R.id.action_nav_dashboard_to_boxFragment);
Then the ProgressBar will be rendered for all recycler items with the same state
holder.progressBar.setProgress(percent, true);
RecyclerView uses one view multiple times, when it contains the list which is not displaying on the screen at a time(means a list contain large amount of items which is not displaying on screen at same time you need to scroll up and down). When user scroll the list the offscreen items are reused to display the remaining list items which is called recycling.
To Stop recycling the items call this method in your onBindViewHolder method:
holder.setIsRecyclable(false);
Related
I have been trying to make a photo gallery app and I want to select multiple photos.
The problem in the current implementation is that when I try to longpress to make checkbox visible, the thumbnails are reloading for a fraction of second.
This is because I am calling notifydatasetchanged() after I longpress so that onbindviewholder can load the checkboxes on the screen for every recycler view item, which in turn reloads the thumbnails.
I am using glide to load thumbnails.
I created a RecyclerView that displays items.
Every X items, I have a native ad and beneath it a TextView with some title..
The user has an option to delete an item and then I use the following to do so:
public void removeAt(int position) {
items.remove( position );
notifyItemRemoved( position );
notifyItemRangeChanged( position, items.size() );
}
It does the job good and deletes the item and shifts the whole items one line up.
However, when I scroll over the position of the deleted item it still seems like the image of it is stuck and it shows it in the background between the lines of the RecyclerView as follows:
Any way I can make sure that the deleted item won't appear like this?
SOLUTION:
Setting the background of the title to white did the job.
The most common cause of this is the RecyclerView being inside a Fragment that's being inserted twice, often due to being unconditionally added in the Activity's onCreate when it's already there. Setting the background to white will cover up the issue, but not fix it.
Add some logging (logging when you set the adapter is a good place to do it) to check if your RecyclerView is actually getting added more times than you think.
How Recycler view Bind Data One By One or All in one time?
void onBindViewHolder (VH holder,int position,List<Object> payloads)
Called by RecyclerView to display the data at the specified position.
This method should update the contents of the itemView to reflect the
item at the given position.
So one by one. More here .
Your recycler view calls RecyclerView.Adapter when you set adapter to recycler view or
notify dataset changes to the adapter.
Recycler view calls OnBindViewHolder for each item in your recycler.
Hence, recyclerview binds data one by one.
You can clearly see this when you implement animation to the recycler view items.
RecyclerView is a list drawing library that essentially provides a fixed-size window to load a large dataset into. It recycles the views it created at the begining when the views go out of scope (window) and then if there is a need, reuses them to make it seem as if the views were never offloaded and were virtually present outside the window.It binds the rows which are visible to you and recycles the rest
I have a RecyclerView with a GridLayoutManager with video streams in each grid cell. I need some kind of callback for visibility on each cell to know when to stop the video in the cells that are not visible on screen and start the videos on the cells that are visible.
I've experimented with RecyclerView.OnScrollListener to then use findFirstCompletelyVisibleItemPosition and findLastCompletelyVisibleItemPosition to get the range of visible items. But I haven't found a way to find the items that have moved out of screen.
Is there a way to obtain all the hidden and visible items from the RecyclerView or RecyclerView.Adapter or GridLayoutManager? Or is there a way for the RecyclerView.ViewHolder to listen for changes in its hidden/visible state to stop the video?
I'm new to Android development.
I need to make a listview with text and icon audio player. The icon has three States, "download", "downloading", "play" and "pause". The idea is that when populating the listview, set the "download" icon if the track is not downloaded and "play" if the track is downloaded". If a person clicks the "download" button the icon should be updated to "downloading" to start the download, then when complete, you should see the icon "play". If the user presses the "play" icon for this element should be updated to "pause".
I can't change the icon . I tried to change them in onItemClickListener and make the onClick in the getView method in adapter, but when scrolling the icons changed to the old. And if you select multiple items in the list, then change all the icons, and I need to change only one, for playing of the track.
I didn't show the code because there is nothing that can be corrected. - all wrong
if you have your own adapter try using a method notifyDataSetChanged();
That is happening due to recycling of views. If you click on an item and you will see multiple items clicked.
Use RecyclerView instead of listView, which will handle recycling by its own and its ViewHolder class takes care of the issue you are having.
And don't forget to notify the recyclerView adapter whenever you make some change in data source (i.e. arraylist)
Check out this example...
Hope it helps
http://hmkcode.com/android-simple-recyclerview-widget-example/