Android setVisibility not working in PagerAdapter

Question

I'm trying to hide and show part of my view in my PagerAdapter item but it doesn't do anything, not GONE, VISIBLE, or INVISIBLE.

public class FeedPagerAdapter extends PagerAdapter {
    private final String KEY_GLOBAL_PREFS = "global";

    @BindView(R.id.item) ImageView image;
    @BindView(R.id.progress_bar) ProgressBar progressBar;

    private final SlideActivity host;
    private List<Thing> items;

    private SharedPreferences sharedPreferences;

    private int postition;

    public FeedPagerAdapter(SlideActivity host, List<Thing> items){
        this.host = host;
        this.items = items;

        sharedPreferences = host.getSharedPreferences(KEY_GLOBAL_PREFS, Context.MODE_PRIVATE);
    }

    @Override
    public Object instantiateItem(final ViewGroup parent, int position) {
        final View view = LayoutInflater.from(host).inflate(R.layout.item_slide_reddit_post, parent, false);
        ButterKnife.bind(this, view);

        progressBar.setVisibility(View.GONE);

        return view;
    }

    @Override
    public int getCount() {
        return items.size();
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView((View)object);
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view == object;
    }
}

Here's the item xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/item"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src:"..."/>
    <ProgressBar
        android:id="@+id/progress_bar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</RelativeLayout>

And here is how the adapter is set up from the host activity:

adapter = new FeedPagerAdapter(SlideActivity.this, List<> of items);
viewPager.setAdapter(adapter);
viewPager.setCurrentItem(position);
adapter.notifyDataSetChanged();

Any help would be awesome

Answer 1

It seems that using Butterknife or standard findViewById to setup ProgressBar item doesn't work to update the view, not sure why, maybe someone can explain. I solved by seeking out the actual item every time it's visibility needs to be changed in PagerAdapter like so:

@Override
    public Object instantiateItem(final ViewGroup parent, int position) {
        final View view = LayoutInflater.from(host).inflate(R.layout.item_slide_reddit_post, parent, false);
        ButterKnife.bind(this, view);

        view.findViewById(R.id.progress_bar).setVisibility(View.GONE);

        return view;
    }