[error record] the shutter component reports an error (no directionality widget found. | richtext widgets require a directionality)

One 、 Error message

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Error message :

Performing hot reload...Syncing files to device Pixel 2...Reloaded 0 libraries in 353ms.======== Exception caught by widgets library =======================================================The following assertion was thrown building Text(" Animation state  : null"):No Directionality widget found.RichText widgets require a Directionality widget ancestor.The specific widget that could not find a Directionality ancestor was: RichText  softWrap: wrapping at box width  maxLines: unlimited  text: " Animation state  : null"  dirtyThe ownership chain for the affected widget is: "RichText ← Text ← Column ← Padding ← Container ← AnimationApp ← [root]"Typically, the Directionality widget is introduced by the MaterialApp or WidgetsApp widget at the top of your application widget tree. It determines the ambient reading direction and is used, for example, to determine how to lay out text, how to interpret "start" and "end" values, and to resolve EdgeInsetsDirectional, AlignmentDirectional, and other *Directional objects.The relevant error-causing widget was:   Text file:///D:/002_Project/002_Android_Learn/flutter_animation/lib/main.dart:118:11When the exception was thrown, this was the stack: #0      debugCheckHasDirectionality.<anonymous closure> (package:flutter/src/widgets/debug.dart:272:7)#1      debugCheckHasDirectionality (package:flutter/src/widgets/debug.dart:292:4)#2      RichText.createRenderObject (package:flutter/src/widgets/basic.dart:5539:37)#3      RenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5423:28)#4      MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:6166:11)...============================================================================================================ Exception caught by widgets library =======================================================No Directionality widget found.The relevant error-causing widget was:   Text file:///D:/002_Project/002_Android_Learn/flutter_animation/lib/main.dart:120:11============================================================================================================ Exception caught by rendering library =====================================================A RenderFlex overflowed by 199358 pixels on the bottom.The relevant error-causing widget was:   Column file:///D:/002_Project/002_Android_Learn/flutter_animation/lib/main.dart:96:14====================================================================================================

Error component :

Text(" Animation state  : $animationStatus"),Text(" Animation values  : $animationValue"),

Two 、 Solution

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Flutter in Text Component needs to set text direction ;

The revised code is :

Text(" Animation state  : $animationStatus", textDirection: TextDirection.ltr,),Text(" Animation values  : $animationValue", textDirection: TextDirection.ltr,),