Layout file and GridAdapter snippets.

gistfile1.txt

//GridItem.xml
...
<ImageView
    android:id="@+id/mapImageStarredGrid"
    android:layout_width="match_parent"
    android:layout_height="175dp"
    android:adjustViewBounds="true"
    android:scaleType="centerCrop" />
...

//Grid Adapter bindView()
...
Picasso.with(context)
  .load(request)
  .placeholder(R.color.super_light_grey)
  .error(R.color.light_grey)
  .into(holder.map);
...