Data binding adapter. How to get view by id reference?

Question

I want to specify view reference as atribute to ImageView

@BindingAdapter(value = {"imageUrl", "progressView"}, requireAll = false)
public static void setImageUrl(ImageView imageView, String url, @IdRes int progressBar) {
    Context context = imageView.getContext();
    View progressView  = imageView.getRootView().findViewById(progressBar);
     progressView.setVisibility(View.VISIBLE);

    Glide.with(context).load(url).listener(new RequestListener<String, GlideDrawable>() {
        @Override
        public boolean onException(Exception e, String model, Target<GlideDrawable> target, boolean isFirstResource) {
            if (progressView!= null) {
                 progressView.setVisibility.setVisibility(View.GONE);
            }
            return false;
        }

        @Override
        public boolean onResourceReady(GlideDrawable resource, String model, Target<GlideDrawable> target, boolean isFromMemoryCache, boolean isFirstResource) {
            if (progressView!= null) {
                 progressView.setVisibility(View.GONE);
            }
            return false;
        }
    }).crossFade().into(imageView);
}

however my progress view is null. I tried cast context to activity and findViewById also null Another solution is just add progress view below Image and when it loads successfully it should be overlayed bt image

Answer 1

Strange that you're seeing a null progressView. You may not have it in your layout maybe?

In any case, you can do this instead:

<ProgressBar android:id="@+id/progressBarView" .../>
<!-- other stuff -->
<ImageView app:progressView="@{progressBarView}" app:imageUrl="..." .../>

And in your BindingAdapter:

@BindingAdapter(value = {"imageUrl", "progressView"}, requireAll = false)
public static void setImageUrl(ImageView imageView, String url, ProgressBar progressBar) {
    ...
}