How to unregister LocalBroadcastManager in ViewHolder?

Question

I have a ViewHolder that registers as a receiver for the LocalBroadcastManager. The ViewHolder also has a delegate to the Activity that holds the RecyclerView.

This causes a memory leak, because I can't manage to unregister the broadcast manager in the view holder when the activity is destroyed.

public class MyHolder extends RecyclerView.ViewHolder {

    public interface Delegate {
        ...
    }

    private @Nullable Delegate delegate;

    public MyHolder(@NonNull View itemView) {
        super(itemView);
    }

    public void bind(@NonNull Delegate delegate) {
        this.delegate = delegate;
        registerNotifications();
    }

    public void recycle() {
        unregisterNotifications();
        delegate = null;
    }

    private void registerNotifications() {
        LocalBroadcastManager.getInstance(App.getInstance().getApplicationContext()).registerReceiver(broadcastReceiver, new IntentFilter(MyFilter));
    }

    private void unregisterNotifications() {
        LocalBroadcastManager.getInstance(App.getInstance().getApplicationContext()).unregisterReceiver(broadcastReceiver);
    }

    private BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            ...
        }
    };
}

I tried to call recycle in the RecyclerView.Adapter's onViewDetachedFromWindow and onViewRecycled. But it seems that there is no guarantee that any of these will be called when the activity is destroyed.

How can I make sure that the broadcast receiver is unregistered properly when the activity is destroyed or the ViewHolder is recycled?