recycler-adapter | 易学教程

removing RecyclerView items

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问题 I have a RecyclerView which is adding items each certain period. When adding objects, if list items are more than (lets say) 500, then the first items will be removed and the new items will be added. If the RecyclerView cannot scroll down any more !recyclerView.canScrollVertically(1); then, after adding new items the RecyclerView will smoothScroolToPosition() to the last position. Where is the problem? Okay, if ReyclerView is at the middle (not bottom, not top) when removing old items, it

RecyclerView with different Cardlayouts

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问题 What I'd like to do At the moment I'm playing around with RecyclerView and CardView 's. For now I wrote a RecyclerView.Adapter on which I can display the same CardView multiple times with different content - analog to the ListView with a BaseAdapter . Now I'd like to write a RecyclerView with different CardView-Layout 's (in style of Google Now). I've already searched for tutorials but didn't found anything useful about that topic. Does someone know, how this needs to be implemented? What

RecyclerView gets crashed [IllegalArgumentException] when use notifyItemChanged from Handler using Runnable

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问题 I'm using RecyclerView as a list to show songs that can be downloaded. Each item has ProgressBar in its View . When the download starts, then I use a Handler to notify each item to update the ProgressBar to show the song download progress. Q1. Is this is a correct way to do it or Is there any other way to do it more appropriately. Q2. RecyclerView gets crashed when we use adapter.notifyItemChanged(position); to update the content of single item. It is called from a Handler using Runnable .

Loading large number of items in recycler view

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I have a recycler view within a fragment and basically I m trying to load song list in the recycler view .Each row of recycler view contains an imageview (for album art) and textview ( for song name). I am having trouble when the size of the dataset is huge, that is when there are too many songs, the recycler view lags and the app ends up giving an ANR.I am using Glide to load album arts in each row's imageview. How is google music player able to show such large number of songs without any lag? Edit: This is my SongsFragment public class SongsFragment extends Fragment { static {

Not able to add empty view below Recyclerview

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问题 I was trying my hand with recyclerview and floating action button for an app. The problem I encountered is that the floating action button hinders with the buttons in recyclerview. I looked up how the android apps such as phone app(one where you have contacts displayed in gridvew) are designed to deal with this, I see that there is empty space left in the bottom which gives space between recyclerview and floating action button, user just needs to scroll to the bottom to avoid the overlap. I

Cannot call notifyItemInserted() from RecyclerView.OnScrollListener

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问题 Recently I upgrade my recyclerview-v7:23 to recyclerview-v7:24.2.0 . My applicaton has an endless scroll list. The error message points to the line notifyItemInserted when I add loading view into RecyclerView (null object it means loading, id 0 is empty, -1 is end of the page) and it works fine before (recyclerview-v7:23) but suddenly I got error like this and somehow my loading show up twice then when it removed one, there is one loading that still visible in the top. W/RecyclerView: Cannot

RecyclerView onBindViewHolder only called when getItemViewType changes

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问题 I have a viewholder with multiple viewtypes. When scrolling onBindViewHolder is only called when getItemViewType changes value. This causes my list items to not be updated properly. Is this a bug? Or I'm i doing something wrong here. This seems very strange behaviour from the new recyclerView class. Here is my adapter: package se.davison.smartrecycleradapter; import android.content.Context; import android.support.v7.widget.RecyclerView; import android.util.Log; import android.util

Recyclerview item click ripple effect [duplicate]

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This question already has answers here : Adding Ripple Effect to RecyclerView item (3 answers) I am trying to add Ripple Effect to RecyclerView 's item. I had a look online, but could not find what I need. I have tried android:background attribute to the RecyclerView itself and set it to "?android:selectableItemBackground" but it did not work.: My Parent layout is like this <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="10dp"> <android.support.v7.widget.RecyclerView android:id="@+id/dailyTaskList" android:layout_width="match_parent"

RecyclerView gets crashed [IllegalArgumentException] when use notifyItemChanged from Handler using Runnable

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I'm using RecyclerView as a list to show songs that can be downloaded. Each item has ProgressBar in its View . When the download starts, then I use a Handler to notify each item to update the ProgressBar to show the song download progress. Q1. Is this is a correct way to do it or Is there any other way to do it more appropriately. Q2. RecyclerView gets crashed when we use adapter.notifyItemChanged(position); to update the content of single item. It is called from a Handler using Runnable . But, the log don't show any traces for my code. Why? Below is the log for this issue: 05-06 19:09:45.804:

onBindViewHolder() is never called on view at position even though RecyclerView.findViewHolderForAdapterPosition() returns null at that position

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I have a list with 13 items (although items may be added or removed), positions 0-12. When the fragment containing the RecyclerView is first shown, only positions 0 through 7 are visible to the user (position 7 being only half visible). In my adapter I Log every time a view holder is binded/bound (idk if grammar applies here) and record its position. Adapter @Override public void onBindViewHolder(final ViewHolder holder, final int position) { Log.d(TAG, "onBindViewHolder() position: " + position); ... } From my Log I see that positions 0-7 are bound: I have a selectAll() method that gets each