android – how to retrieve data from mysql in nested Recyclerview like Playstore-ThrowExceptions

Exception or error:

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Here is my horizantal recyclerview image.
I retrieved the data from mysql but how to show different data in every recyclerview.

How to solve:

You are trying to update the UI from a Thread that is a callback for the Firebase response.
You should call the method notifyDataSetChanged(); from the UI Thread.

Try this:

getActivity().runOnUiThread(new Runnable() {
    public void run() {

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