Classify: Add "Loading…" text below the progress spinner.
Classify: Extra the progress view to progress.xml for reuse.
ExampleViewerFragment: Show the loading progress view while getting the image.
Rename icon files.

Use an ic_small_* prefix on the small/contextual icons.
These should be smaller than action icons:
http://developer.android.com/design/style/iconography.html
However, I cannot find any standard prefix for these icon names,
so I invented ic_small_*.

I have not yet changed the icon sizes.
List: Correct the small/contextual icons.

Move ic_small_accept.png, ic_small_favorite.png and ic_small_upload.png
from res/xhdpi/ to res/drawable-xxhdpi/ because xhdpi action icons
have the same pixel sizes as xxhdpi small/contextual icons:
http://www.creativefreedom.co.uk/icon-designers-blog/android-4-1-icon-size-guide-made-simple/

Generate the other sizes using the Anroid Asset Studio,
using Trim=Trim, Padding=0%, Size=12dip, Padding=2dip.
For instance:
http://romannurik.github.io/AndroidAssetStudio/icons-generic.html#source.type=clipart&source.space.trim=1&source.space.pad=0&source.clipart=res%2Fclipart%2Ficons%2Fav_upload.svg&size=12&padding=2&color=fff%2C100&name=ic_small_upload