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ConcurrentModificationException thrown on for

problem of cant add element while iterating. i tried th emethod of creating another arraylist nd store element there and add them all in one time but it didnt work because you nedd the arraymist size to operate right. any help pls. Answer You’re doing the following: Obtain an iterator from some collection object. a for (var foo : collectionObject)

Android NullPointer Attempt to invoke virtual method ‘boolean java.util.ArrayList.add(java.lang.Object)’ on a null object reference

I’m getting this error: java.lang.NullPointerException: Attempt to invoke virtual method ‘boolean java.util.ArrayList.add(java.lang.Object)’ on a null object reference and just to make it clear is that I know others with the same issue have asked the same question and I have read the solutions which are usually that you have to instantiate your ArrayList which however I am obviously doing but

recyclerViewAdapter.getItemCount() returning 0 even when it has objects inside?

I’m building a Fragment with a RecyclerView which displays notices retrieved from my database. Everything works fine, except for this line of code: Problem: recyclerViewAdapter.getItemCount() This statement returns 0 even if the RecyclerViewAdapter has elements present. The full scenario is whenever the fragment loads, the Toast with the appropriate message pops up, but then after a slight delay, the first

Firebase Verify Badge [closed]

Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers. This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers. Closed 2 months ago. Improve this question

I got the following error while pulling data from android studio Firebase

I could not understand the problem. It gave such an error when trying to pull the information from the Realtime Database or code.firebasteki to the screen, what is the problem? Book MainActivity RecyclerView_Config FirebaseDatabaseHelper firebase E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.phonebook, PID: 14998 Failed to convert value of type java.lang.Long to String at at at at

get data with query from document collection and document subcollection in firestore

I have a collection with “grup” name and have a subcollection named “anggota”. Please help me, how to display data by query referring to collection document and subcollection document. Firestore collection: I’ve tried with this query but it doesn’t work, the data doesn’t appear Answer When you are using the following query: It means that you are creating a reference