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Concepts
- Forms and validation3.47.7forms
onUnfocus (when a field loses focus), or always. To read what the user typed, either attach a TextEditingController (controller.text) or handle onChanged. The controller also lets
- Networking and JSON3.47.7data
code, decode the body with jsonDecode and turn the resulting map into a typed model through a fromJson constructor. Kick the request off once (not in build
- Platform integration and platform channels3.47.7platform
answers with success, error or notImplemented. StandardMessageCodec serializes null, bool, int, double, String, typed byte/int/float lists, List and Map automatically; anything else must be flattened into those
- Animations3.47.7animation
dispose(). A Tween maps the controller's 0..1 value to the type you need (double, Color, Rect); a CurvedAnimation or curve argument reshapes the timing with
- State management3.47.7state
Flutter is declarative: the UI is a function of state, so instead
- Navigation and routing3.47.7navigation
Navigator keeps a stack of Route objects; Navigator.push adds a route built