CODEWITHSUNDEEP
androidandroid-layoutandroid-recyclerviewbundle
O_o
O_o

Reputation: 1103

How to restore to the previous state in RecyclerView after loading more data

I have been working with RecyclerView for a while. I am following lazy loading, so I am showing 10 data on the view each time. If user scroll to the bottom, the page re-load from the TOP! however, I want to stay where it was previously! So, I have tried to use 

recyclerView.scrollToPosition(position);

However, this breaks the UI flow! My second try is using onSaveInstanceState() and onRestoreInstanceState(Bundle state); However, that does not work! My page is re-loads to the top!

Parcelable state = layoutManager.onSaveInstanceState();
layoutManager.onRestoreInstanceState(state);

I have tried every other methods, apparently none is working for me! Any help would be highly appreciated! Thanks in advance!

Upvotes: 0

Views: 554

Answers (3)

Jai
Jai

Reputation: 1984

Note : Make sure that you are not initialising or calling setAdapter() method each time after updating your dataset. If not, then

You have to update your data list and call notifyDataSetChanged() which will update your adapter from existing position.

Let's say you have stored your data into ArrayList mData;

Your getItemCount() would be

@Override
public int getItemCount() {

if (mData != null && mData.length() > 0)
    return mData.size();

    return 0;
}

Now create one more method in your adapter which you will called each time whenever you will get new data from server. This method will simply override your dataset and will update your adapter

private void updateDataSet(ArrayList<String> mData){

  this.mData = mData;
  notifyDataSetChanged();

}

Upvotes: 1

Mohit Trivedi
Mohit Trivedi

Reputation: 729

I have done this functionality before 2 days ago

I share my idea with you

Make 

Listview lv; //Assume Find view by Id 
List<Model> models = new ArrayList();

Now Make an Adapter and assign blank models 

CustomAdapter adapter = new CustomeAdapter(context,models);
lv.setAdapter(adapter);

Now when you have new data to load with lazylodaing

do this

models.addAll(newModels); //new ModelList
adapter.notifyDataSetChanged();

Thats it.

Upvotes: 1

Rahul Khurana
Rahul Khurana

Reputation: 8844

This is the default behaviour Recycler View to recycle/resuse views. As in official docs: https://developer.android.com/reference/android/support/v7/widget/RecyclerView.html
If you are having any view related issues then save your view state in your List<Object> like setting visible item or not per position. And in your onBindViewHolder method as per position show/hide your view.

Upvotes: 0

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