Activities and UI Widgets

Activities

An Activity represents one screen. The launcher activity is declared in the manifest and can start further activities with intents.

Tabs and ViewFlipper

TabHost groups screens; a ViewFlipper animates between child views.

Common Widgets

• ToggleButton - on/off switch.
• AutoCompleteTextView - text entry with suggestions.
• DatePicker - date selection.
• ColorPicker / SeekBar - visual choices and sliders.

Sliders and Flippers

A slider/SeekBar drives a changing value; a flipper shows the next screen.

Key Points

• Activities plus widgets combine into real screens instantly.
• Use intents to navigate; adapters feed lists and auto-completes.
• Small demo apps are the fastest way to learn a widget.