Code Structure

Key breakdowns:

Activities started within the UI:

ContributionsActivity (ContributionsListFragment, MediaDetailPagerFragment, MediaDetailFragment) - main "my uploads" list and detail view
LoginActivity - login screen when setting up an account
SettingsActivity - settings screen
AboutActivity - about screen

Activities receiving intents:

ShareActivity (SingleUploadFragment, CategorizationFragment) - handles receiving a file from another app, accepting a title/desc, and slating it for upload
MultipleShareActivity (MultipleUploadListFragment, CategorizationFragment) - handles receiving a batch of multiple files from another app, accepting a title/desc, and slating them for upload

Services:

WikiAccountAuthenticatorService - authentication service
UploadService - performs actual file uploads in background
ContributionsSyncService - polls for updated contributions list from server
ModificationsSyncService - pushes category additions up to server

Content providers:

ContributionsContentProvider - private storage for local copy of user's contribution list
ModificationsContentProvider - private storage for pending category and template modifications
CategoryContentProvider - private storage for recently used categories