Question 125806 in Android Studio Question posted in
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Android Studio – Error: The method 'FlatButton' isn't defined for the class 'PlatformButton'

im getting these errors and dont know how to fix them.

../AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_platform_widgets-1.20.0/lib/src/platform_button.dart:269:14: Error: The method 'FlatButton' isn't defined for the class 'PlatformButton'.
 - 'PlatformButton' is from 'package:flutter_platform_widgets/src/platform_button.dart' ('../AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_platform_widgets-1.20.0/lib/src/platform_button.dart').
Try correcting the name to the name of an existing method, or defining a method named 'FlatButton'.
      return FlatButton(
             ^^^^^^^^^^

../AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_platform_widgets-1.20.0/lib/src/platform_button.dart:302:12: Error: The method 'RaisedButton' isn't defined for the class 'PlatformButton'.
 - 'PlatformButton' is from 'package:flutter_platform_widgets/src/platform_button.dart' ('../AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_platform_widgets-1.20.0/lib/src/platform_button.dart').
Try correcting the name to the name of an existing method, or defining a method named 'RaisedButton'.
    return RaisedButton(
           ^^^^^^^^^^^^

../AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_platform_widgets-1.20.0/lib/src/platform_dialog_action.dart:171:14: Error: The method 'FlatButton' isn't defined for the class 'PlatformDialogAction'.
 - 'PlatformDialogAction' is from 'package:flutter_platform_widgets/src/platform_dialog_action.dart' ('../AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_platform_widgets-1.20.0/lib/src/platform_dialog_action.dart').
Try correcting the name to the name of an existing method, or defining a method named 'FlatButton'.
      return FlatButton(
             ^^^^^^^^^^
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6

Answers


  1. 0

    If you’re on the latest version of Flutter, Flatbutton is deprecated, use TextButton instead.

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  2. 0

    Check the last package you added in pubspec.yaml and delete it and see if no error occurs then the error is because the package

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  3. 0 
    **Old Widget        change to    New Widget      
FlatButton   =>      TextButton      
RaisedButton =>      ElevatedButton  
OutlineButton =>    OutlinedButton**

    for more details…
    https://docs.flutter.dev/release/breaking-changes/buttons#context

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  4. 0

    You just have to change the velocity_x:old version to new version.
    For Eg:
    in pubspec.yaml
    dependencies:
    velocity_x:^1.4.1 change it to ^3.2.1

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  5. 0

    FlatButton is deprecated and totally removed from flutter after flutter 2.1.0
    Use TextButton instead of FlatButton as follows:

    TextButton(
              style: TextButton.styleFrom(
                foregroundColor: Colors.white,
                padding: const EdgeInsets.all(16.0),
                textStyle: const TextStyle(fontSize: 20),
              ),
              onPressed: () {},
              child: const Text('Gradient'),
            ),
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  6. 0

    As seen from Flutter Documentation:
    enter image description here

    Old Widgets have been removed, Now you have to use the new widget along with the new theme. Here is a quick guide on how to use them.

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