Save scroll position of RecyclerView in Android

Method 1 :

@onPause

long currentVisiblePosition = 0; // this variable should be static in class
currentVisiblePosition = ((LinearLayoutManager)rv.getLayoutManager()).findFirstCompletelyVisibleItemPosition();

@onResume

((LinearLayoutManager) rv.getLayoutManager()).scrollToPosition(currentVisiblePosition);
currentVisiblePosition = 0;

Method 2 :

protected void onSaveInstanceState(Bundle state) {
     super.onSaveInstanceState(state);

     // Save list state
     mListState = mLayoutManager.onSaveInstanceState();
     state.putParcelable(LIST_STATE_KEY, mListState);
}

protected void onRestoreInstanceState(Bundle state) {
    super.onRestoreInstanceState(state);

    // Retrieve list state and list/item positions
    if(state != null)
        mListState = state.getParcelable(LIST_STATE_KEY);
}

if we are in fragment onRestoreInstanceState is not available so we can use this :

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
        // Retrieve list state and list/item positions
    if(state != null)
        mListState = state.getParcelable(LIST_STATE_KEY);
    }
}

Then update the LayoutManager (for example in onResume() or after loading recyclerView):

@Override
protected void onResume() {
    super.onResume();

    if (mListState != null) {
        mLayoutManager.onRestoreInstanceState(mListState);
    }
}

References
https://stackoverflow.com/questions/36568168/how-to-save-scroll-position-of-recyclerview-in-android
https://stackoverflow.com/questions/27816217/how-to-save-recyclerviews-scroll-position-using-recyclerview-state
https://stackoverflow.com/questions/43857824/kotlin-static-methods-and-variables
https://stackoverflow.com/questions/28236390/recyclerview-store-restore-state-between-activities

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