flutter-build-responsive-layout

Wrap your widget tree in a LayoutBuilder and read constraints.maxWidth to decide which layout to return. Define a breakpoint such as 600 pixels, then return a Row-based layout for wide windows and a Column-based layout for narrow ones.

Use LayoutBuilder when a widget should adapt to the space its parent allocates, and MediaQuery.sizeOf when you need the full app window size. Avoid MediaQuery.orientationOf near the top of the tree because orientation does not reflect actual window space.

Wrap the widget in a ConstrainedBox with BoxConstraints(maxWidth: value) and center it with a Center widget. For lists, convert ListView.builder to GridView.builder with SliverGridDelegateWithMaxCrossAxisExtent so column counts adjust automatically.

No, locking orientation causes letterboxing on foldable devices and fails Android large-screen requirements. If orientation must be locked, use the Display API for physical screen dimensions because MediaQuery reports incorrect sizes in compatibility modes.

Overflow happens when children have fixed sizes that exceed the incoming constraints. Use Expanded or Flexible inside Row and Column to distribute remaining space, and base layout decisions on constraints.maxWidth from LayoutBuilder.