Responsive Sizer helps implement a responsive layout by providing helper widgets and extensions.

• Installation
• Usage
• Parameters
• Take Note
• FAQ
• Community Support

Add responsive_sizer to pubspec.yaml

dependencies:
  responsive_sizer: ^3.2.0

import 'package:responsive_sizer/responsive_sizer.dart';

ResponsiveSizer( 
  builder: (context, orientation, screenType) {
    return MaterialApp(
      home: HomePage(),
    );
  },
);

Container(
  width: Adaptive.w(20),    // This will take 20% of the screen's width
  height: 30.5.h     // This will take 30.5% of the screen's height
)

Text(
  'Responsive Sizer', 
  style: TextStyle(fontSize: 15.dp), 
  // 15.sp can also be used instead of .dp
  // To know their differences, check #FAQ
)

If you want to support both portrait and landscape orientations

Device.orientation == Orientation.portrait
  ? Container(   // Widget for Portrait
      width: 100.w,
      height: 20.5.h,
   )
  : Container(   // Widget for Landscape
      width: 100.w,
      height: 12.5.h,
   )

If you want the same layout to look different in tablet and mobile, use the Device.screenType method:

Device.screenType == ScreenType.tablet
  ? Container(   // Widget for Tablet
      width: 100.w,
      height: 20.5.h,
   )
  : Container(   // Widget for Mobile
      width: 100.w,
      height: 12.5.h,
   )

*Device.ScreenType can not be Desktop unless maxTabletWidth is set

• maxMobileWidth - Maximum width of a mobile device (If the device's width is larger than this, it will be categorized as a tablet) - Default value: 599
• maxTabletWidth - Maximum width of a tablet device (If the device's width is larger than this, it will be categorized as a desktop) - Optional: enables Desktop ScreenType if enabled

• Adaptive.h() or .h - Calculated percentage of the device's height (40.h -> 40% of device's height)
• Adaptive.w() or .w - Calculated percentage of the device's width (40.w -> 40% of device's width)
• Adaptive.sp() or .sp - Calculated sp based on the device's pixel density and aspect ratio (See FAQ)
• Adaptive.dp() or .dp - Calculated dp based on the device's pixel density (See FAQ)

• Device.boxConstraints - BoxConstraints of the device
• Device.orientation - Screen Orientation of the device (portrait or landscape)
• Device.screenType - Screen type of the device (mobile or tablet)
• Device.aspectRatio - Aspect ratio of the device
• Device.pixelRatio - Pixel density ratio of the device

• Adaptive.cm() or .cm - The respective value in value in centimeters
• Adaptive.mm() or .mm - The respective value in value in millimeters
• Adaptive.Q() or .Q - The respective value in quarter-millimeters
• Adaptive.inches() or .inches - The respective value in inches
• Adaptive.pc() or .pc - The respective value in picas (1/6th of 1 inch)
• Adaptive.pt() or .pt - The respective value in points (1/72th of 1 inch)
• Adaptive.px() or .px - The respective value in pixels

You need to import responsive_sizer package in order to access number.h, number.w, number.dp, and number.sp

Auto import in VSCode and Android Studio doesn't work for dart extension methods. Typing 10.h would not bring up auto import suggestion for this package

One workaround is to type Device so that the auto import suggestion would show up:

import 'package:responsive_sizer/responsive_sizer.dart';

.dp is supposedly calculated see below based on Material Design's dp calculation while.sp is calculated based on the device's pixel density and aspect ratio

Since there is no way to obtain a device's physical width in inches, we could not calculate for screen density. Material Design's screen density calculation involves a device's physical width in inches. As an alternative, dp is calculated using the device's pixel ratio.

If you have any suggestions or issues, feel free to open an issue

If you would like to contribute, feel free to create a PR