• Layouts (Linear and Constraint Layouts)
• Chaining UI
• Buttons, TextViews, EditText
• ImageViews, Checkbox, Radio-Buttons
• Toasts and Context
• Intent and Starting Activities
• Passing Data Between Activities
• Permissions
• Implicit Intents
• Toolbar Menus
• Alert Dialogs
• Spinner
• RecyclerView
• Fragments
• Bottom Navigation View
• View Pager 2
• Tab Layout with View Pager 2
• Navigation Drawer
• Shared Preferences
• Notifications
• Intent Services
• Services
• Drag and Drop
• Broadcast Receiver