Initialising GridView with progress bars

I have two async tasks one of which finds URLs of images and the other one downloads them. I also have a gridview where I want to display images. I have written a custom adapter. Here is the code:

public class ImageGridAdapter extends BaseAdapter {
private Context context;
private ArrayList<Picture> pictures = new ArrayList<Picture>();

public ImageGridAdapter(Context context) {
    this.context = context;
}

public void addPicture(Picture picture) {
    pictures.add(picture);
    notifyDataSetChanged();
}

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

@Override
public Object getItem(int i) {
    return pictures.get(i);
}

@Override
public long getItemId(int i) {
    return 0;
}

@Override
public View getView(int i, View convertView, ViewGroup viewGroup) {
    View view;
    LayoutInflater inflater = LayoutInflater.from(context);
    if (convertView == null) {
        view = inflater.inflate(R.layout.pic_and_info, null);

    } else {
        view = convertView;
    }
    TextView textView = (TextView) view.findViewById(R.id.gridInfo);
    textView.setText("@" + pictures.get(i).getAuthor());
    ImageView imageView = (ImageView) view.findViewById(R.id.gridImage);
    view.findViewById(R.id.pbar).setVisibility(View.GONE);
    imageView.setImageDrawable(pictures.get(i).getDrawable());
    return view;
}

}

My layout elements that are being drawn in the GridView look like this:

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://ift.tt/nIICcg"
    android:id="@+id/picInfo"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/gridImage"
        android:paddingLeft="15dp"
        android:scaleType="centerCrop"
        android:paddingRight="15dp"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:layout_centerInParent="true"/>

    <ProgressBar
        android:id="@+id/pbar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:indeterminate="true"
        android:layout_centerInParent="true"
        />

    <TextView
        android:id="@+id/gridInfo"
        android:layout_below="@+id/gridImage"
        android:layout_marginTop="14dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:textColor="#585858"/>

</RelativeLayout>

So the problem I have is really silly. I want to draw a progress bar for each link during postExecute of imageSearching task. But i don't know how to initiate the drawing of GridView. With my current code progress bars are drawn in getView and disapper before I can see them.