There are many examples in the Android SDK, in which Apidemo details the main API for the Android platform, divided into
App
Content
Graphics
Media
OS
Text
Views
A few large classes, each of which is divided into smaller classes, have about 200 instances, covering all aspects of the Android OS API: Here is a list of all the examples:
App/activity/animation
App/activity/custom Dialog
App/activity/custom Title
App/activity/dialog
App/activity/forwarding
App/activity/hello World
App/activity/persistent State
App/activity/quickcontactsdemo
App/activity/receive result
App/activity/redirection
App/activity/reorder Activities
App/activity/save & Restore State
App/activity/setwallpaper
App/activity/translucent
App/activity/translucent Blur
App/activity/wallpaper
App/alarm/alarm Controller
App/alarm/alarm Service
App/device Admin
App/dialog
App/intents
App/launcher shortcuts
App/menu/inflate from XML
App/notification/incomingmessage
App/notification/notifying Service Controller
App/notification/notifywithtext
App/notification/status Bar
App/preferences/1. Preferences from XML
App/preferences/2. Launching preferences
App/preferences/3. Preference Dependencies
App/preferences/4. Default values
APP/PREFERENCES/5. Preferences from Code
App/preferences/6. Advanced Preferences
App/search/invoke Search
App/search/query Search Results
App/service/foreground Service Controller
App/service/local Service Binding
App/service/local Service Controller
App/service/messenger Service
App/service/remote Service Binding
App/service/remote Service Controller
App/service/service Start Arguments Controller
App/text-to-speech
App/voice recognition
Content/assets/read Asset
Content/resources/resources
Content/resources/styled Text
Content/storage/external Storage
Graphics/alphabitmap
Graphics/animatedrawables
Graphics/arcs
Graphics/bitmapdecode
Graphics/bi Tmapmesh
Graphics/bitmappixels
Graphics/camerapreview