android tv -Reloading adapter data

Question

I want to re-load some of the rows data in a browse fragment.

Basically I want to reset the adapter data without causing a flash like effect in the browse fragment. Any idea how it can be done?

Something like notifyDataSetChanged() in list view.

Thanx

Swordplay

just add the values to the adapter using adapter.add(item). incase you are adding to existing values or do adapter.clear() and the add. – Slashing

Answer 1

This will refresh data without losing current position:

for (int i = 0; i < mAdapter.size(); i++) {
    ListRow listRow = ((ListRow) mAdapter.get(i));
    ArrayObjectAdapter listRowAdapter = ((ArrayObjectAdapter) listRow.getAdapter());
    if (listRowAdapter.size() > 0) {
        listRowAdapter.notifyArrayItemRangeChanged(0, listRowAdapter.size());
    }
}

Grazing

Answer 2

I answered something similar in this question: Dynamically add more cards in a list Row android TV leanback

I'll copy my answer from there. Hopefully this helps.

To add items to a presenter;

CardPresenter channelCardPresenter = new CardPresenter();
ArrayObjectAdapter channelRowAdapter = new ArrayObjectAdapter(channelCardPresenter);
channelRowAdapter.add(new Movie("Movie Title"));
HeaderItem header = new HeaderItem(0, "My Channels");
mRowsAdapter.add(new ListRow(header, channelRowAdapter));

Of course this may only work for the first time you're creating the UI. Future times may not do this. In my app, CumulusTV, I create a method that will be called each time I want to do a full redraw of the app:

public void refreshUI() {
    prepareBackgroundManager();
    setupUIElements();
    loadRows(); //Generate and populate all the rows
    setupEventListeners();
}

Duster

your link is broken, can you please post it again? – Ihs

I have made many changes to the codebase since I originally posted the answer. I went back through the commit history and updated the URL to point to the file at the time of answering. – Duster

Answer 3

You can create your own adapter and add a new replaceAll() method.

public void replaceAll(Collection items){
 int itemsCount = items.size();
 if (itemsCount == 0){
    return;
 }
 mItems.clear();
 mItems.addAll(index, items);
 notifyItemRangeChanged(0, itemsCount);
}

complete source:link

Crucify

Answer 4

Here's my kotlin version of @ewilly's answer, implementing only replaceAll which I use to both initially populate and incrementally update the list.

class RefreshableArrayObjectAdapter(presenter: Presenter): ObjectAdapter(presenter) {
    var items: ArrayList<Any> = arrayListOf()

    override fun isImmediateNotifySupported(): Boolean = true

    override fun size(): Int = items.size

    override fun get(position: Int): Any = items[position]

    fun replaceAll(list: Collection<Any>) {
        items.clear()
        items.addAll(0, list)
        notifyChanged()
    }
}

Sidesaddle

Answer 5

  /**
 * Notify that the content of a range of items changed. Note that this is
 * not same as items being added or removed.
 *
 * @param positionStart The position of first item that has changed.
 * @param itemCount The count of how many items have changed.
 */
public void notifyArrayItemRangeChanged(int positionStart, int itemCount) {
    notifyItemRangeChanged(positionStart, itemCount);
}

Notify that the content of a range of items changed. Note that this is * not same as items being added or removed.

if you want add or remove item,please try this:

1.mRowsAdapter.clear();
2.mRowsApdapter.addAll();

Potentate