Anything you need to develop android applications

Basic :
1. App manifest
2. Broadcast receiver
3. Service
4. Activity
5. File storage
6. Data storage
7. Notification
8. Network handling
9. Sensors

Interface :
1. UI components
2. UI layouts
3. resources
4. Fragments
5. Custom components

UI more :
1. About (4 pages)
2. Article (5 pages)
3. Login (4 pages)
4. Verification (4 pages)
5. Profile (4 pages)

Code more :
1. Clipboard
2. Animations
3. Audio capture
4. Media player
5. Text to speech
6. Audio manager
7. Bluetooth
8. Image effects
9. Google maps