Update One Item in RecyclerViewAdapter with Otto

Question

I am using the DownloadManager to download files and would like to update a progress view in a RecyclerView.ViewHolder for each download.

My current idea is to use Otto to post a downloadProgressed event. I would like my viewHolders to register in the event bus, but I am not sure where I should have them register and unregister.

Is this a good idea? Or should I be looking for a better solution?

Answer 1

You can register the event bus in the fragment/activity and pass events to your adapter through a funciton.

Your subsciber in the fragment/activity will look like this

@Subscribe public void downloadEvent(DownloadEvent event){
    adapter.updateDownloadState(event.getItemId(), event.getDownloadProgressPercentage());
}

Inside your adapter have a function like this

public void updateDownloadState(int itemId, int progress){
    Object obj = findItemWithId(itemId);
    obj.setProgress(progress);
    this.notifyDataSetChanged();
}

private Object findItemWithId(int itemId){
    // code to find your object in the list eg. by iteration
}