Develop Reference

How to fix a Layout cast error when setting an adapter for an Android ListView?

I have a strange issue setting up an adapter for a ListView, the ListView is inside the CandidateView of a custom keyboard, I use a class that inherit of AsyncTask class to execute an API call that returns me a list of items to be displayed on a ListView, in the method onPostExecute() of AsyncTask I take the search results and add to an ArrayList, then this array is being passed to the adapter using the method updateResults(), and finally set the ListView's adapter, everything is fine until here, the code compiles, but during runtime I get the next error:
FATAL EXCEPTION: main
Process: ....., PID: 5326
java.lang.ClassCastException: >android.widget.FrameLayout$LayoutParams cannot be cast to >android.widget.AbsListView$LayoutParams
at >android.widget.ListView.clearRecycledState(ListView.java:545)
at android.widget.ListView.resetList(ListView.java:532)
at android.widget.ListView.setAdapter(ListView.java:475)
at >......KeyboardIME$SearchAsyncTask.onPostExecute(KeyboardIME.java:2325)
at >......KeyboardIME$SearchAsyncTask.onPostExecute(KeyboardIME.java:2195)
at android.os.AsyncTask.finish(AsyncTask.java:667)
at android.os.AsyncTask.-wrap1(AsyncTask.java)
at >android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:684)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at >com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.>java:886)
at >com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Based on what it said it is a casting error, but I'm not using a FrameLayout on any of the XML files related to the view, also the line 2195 is where the inner AsyncTask class starts and the line 2325 is where I set the adapter for the ListView, this adapter is a basic class inherited from BaseAdapter.
Here are the code lines I execute as described above:
List<SearchItem> searchResults = new ArrayList<>(serverResults);
keyboardInstance.get().mAdapter.updateResults(searchResults);
keyboardInstance.get().resultListView.setAdapter(keyboardInstance.get().mAdapter);

How to fix the IndexOutOfBoundsException in RecyclerView

I have a bunch of RecyclerViews throughout my application and have been seeing this exception in Fabric for a while now.
Stacktrace:
Fatal Exception: java.lang.IndexOutOfBoundsException: Inconsistency detected. Invalid item position 8(offset:8).state:11 android.support.v7.widget.RecyclerView{3914473e VFED.... ........ 0,0-1080,1509 #7f11017a app:id/chatlist_recycler_view}, adapter:com.myapp.application.a.c#134b699f, layout:android.support.v7.widget.LinearLayoutManager#1449aec, context:com.myapp.application.activities.HomeActivity#1fcf5f5e
at android.support.v7.widget.RecyclerView$Recycler.clear(Unknown Source)
at android.support.v7.widget.GapWorker.add(Unknown Source)
at android.support.v7.widget.GapWorker.add(Unknown Source)
at android.support.v7.widget.GapWorker.remove(Unknown Source)
at android.support.v7.widget.GapWorker.add(Unknown Source)
at android.support.v7.widget.GapWorker.run(Unknown Source)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5951)
at java.lang.reflect.Method.invoke(Method.java)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195)
Looking at this updated stacktrace, it seems like it's an issue with my chatlist_recycler_view.
How should I go about debugging this and fixing it? I don't know what is causing the IndexOutOfBoundsException.
Code from the RecyclerView declaration:
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="#+id/chatlist_recycler_view"
android:background="#android:color/white"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:isScrollContainer="false"/>
</RelativeLayout>
If you guys need any other code please let me know!
Adapter code can be found here:
https://pastebin.com/HzMkCDh5

Well, IndexOutOfBoundsException exception is a common one but in regards to recyclerview here is what you can change to avoid the exception.
1: when you assign the layout adapter just disable predictive animations
mRecyclerView.setLayoutManager(new LinearLayoutManager(this){
#Override
public boolean supportsPredictiveItemAnimations() {
return false;
}
});
2: you can try to clear the existing recycler pool and then notify the data change in case of large data set.
mRecyclerView.getRecycledViewPool().clear();
mAdapter.notifyDataSetChanged();
3: dont't use notifyItem.....() use notifyDataSetChanged() only
4: if getting data from API later you can try swapping the adapter again
swapAdapter(adapter, true)
5: make sure you are not scrolling recyclerview to some position on startup this may also cause the index related issues if data is inconsistent.
Link: source

Android App crash because of Null Pointer exception on setting onClick listener in Editor class

I have created a Linear Layout onclick of a button which has an edit text. While typing there is a popup window for suggestions that comes up and the app crashes.
Stack trace:
Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at android.widget.Editor$SuggestionsPopupWindow.initContentView(Editor.java:3714)
at android.widget.Editor$PinnedPopupWindow.(Editor.java:3375)
at android.widget.Editor$SuggestionsPopupWindow.(Editor.java:3660)
at android.widget.Editor.replace(Editor.java:423)
at android.widget.Editor$3.run(Editor.java:2340)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6682)
at java.lang.reflect.Method.invoke(Method.java)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)
I found some related answers which stated that this happens on using Android PopupWindow class since the suggestions are using a PopupWindow as well. My code does not use PopupWindow as well.
This crash is happening mostly on Samsung Note 5, and Galaxy S6.
Any help would be appreciated!

It's saying that your button (which you used like buttonName.setOnClickListener()) is not defined. Check your find view by id function, id inside of it etc.

I think it is because you set in XML a click, but don't have in your class. A check has this tag and remove:
android:onClick="save"

How to set setStackFromEnd(true); in GridLayoutManager for Recyclerview?

I want Grid layout that loads data from last for that I used following code
GridLayoutManager recyclerViewLayoutManager = new GridLayoutManager(getActivity(), 3);
// LinearLayoutManager recyclerViewLayoutManager = new LinearLayoutManager(getActivity());
recyclerViewLayoutManager.setStackFromEnd(true);
lv_explore.setLayoutManager(recyclerViewLayoutManager);
it gives me error like this
java.lang.UnsupportedOperationException: GridLayoutManager does not support stack from end. Consider using reverse layout
at android.support.v7.widget.GridLayoutManager.setStackFromEnd(GridLayoutManager.java:107)
at in.co.ans.jalsounique.FragmentExplore.onCreateView(FragmentExplore.java:86)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:2080)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1108)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1290)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:801)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1677)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:536)
at android.os.Handler.handleCallback(Handler.java:746)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5443)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
when I am using LinearLayoutManager it is working but I need grid view, please advise what should be better way?

It's just what it says: setStackFromEnd is not supported. It's only for lists, not grids.
Consider using reverse layout
So the way you work around this is to call setReverseLayout(true) on your GridLayoutManager.
This means you will need to reverse the entire order of your list. If you are appending items meant to show up at the bottom, you will have to insert them at the beginning instead.

Android RecyclerView Endless Scroll adding item throwing Exception For Android Support Library 24.2.1

I have implemented the Endless scroll with RecyclerView. When user hit the bottom I'm adding null object to display progress in AsyncTask onPreExecute and notify adapter item Inserted. This code I have been using for quiet some time already. Recently I have updated android Support Library From 23.0.3 to 24.2.1. Since then I am getting exception when hit bottom of the list.
Cannot call this method in a scroll callback. Scroll callbacks might be run during a measure & layout pass where you cannot change the RecyclerView data. Any method call that might change the structure of the RecyclerView or the adapter contents should be postponed to the next frame.
java.lang.IllegalStateException:
at android.support.v7.widget.RecyclerView.assertNotInLayoutOrScroll(RecyclerView.java:2403)
at android.support.v7.widget.RecyclerView$RecyclerViewDataObserver.onItemRangeInserted(RecyclerView.java:4634)
at android.support.v7.widget.RecyclerView$AdapterDataObservable.notifyItemRangeInserted(RecyclerView.java:10472)
at android.support.v7.widget.RecyclerView$Adapter.notifyItemInserted(RecyclerView.java:6214)
at com.test.film.buzz.BuzzFeedsFragment$5.onPreExecute(BuzzFeedsFragment.java:229)
at com.test.utils.ParallelAsyncTask.executeOnExecutor(ParallelAsyncTask.java:595)
at com.test.utils.ParallelAsyncTask.execute(ParallelAsyncTask.java:543)
at com.test.film.buzz.BuzzFeedsFragment.onLoadMore(BuzzFeedsFragment.java:258)
at com.test.film.buzz.BuzzFeedsFragment$3.onScrolled(BuzzFeedsFragment.java:177)
at android.support.v7.widget.RecyclerView.dispatchOnScrolled(RecyclerView.java:4305)
at android.support.v7.widget.RecyclerView$ViewFlinger.run(RecyclerView.java:4463)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:871)
at android.view.Choreographer.doCallbacks(Choreographer.java:683)
at android.view.Choreographer.doFrame(Choreographer.java:616)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:857)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)