Handling Null Values Smartly in Flutter Apps Using RTText

Handling Null Values Smartly in Flutter Apps Using RTText:

smart_text_widget is a Flutter package that provides a highly customizable RTText widget. It is designed to handle various scenarios such as null values, empty strings, numbers, lists, maps, and more. The widget also includes features like scrolling, truncation, and dynamic text display.

Features :
Handles Various Data Types: Supports null, empty strings, numbers, lists, and maps.
Dynamic Truncation: Set maximum width and truncate text dynamically.
Scroll Support: Automatically scrolls for long strings or lists.
Custom Separators for Lists: Choose how to separate list items (, or |).
Error Handling: Displays default or custom error text in case of issues.

https://pub.dev/packages/smart_text_widget [Package]
https://researchthinker.com [For Query]

1. Handling Null Values
Efficiently with
smart_text_widget in
Flutter
smart_text_widget
By
ResearchThinker

2. Introduction

What is smart_text_widget?
●- A custom Flutter text widget for displaying strings.
●- Handles null values, lists, maps, and dynamic data types.
●- Offers built-in error handling and display options.

Why is Null Value Handling Important?
●- Prevents runtime errors when data is missing.
●- Ensures the app does not crash due to unexpected null values.
●- Improves user experience by showing appropriate messages or
placeholders.

3. Problem Statement

Common Scenarios Where Null Values Occur:
●1. API Response Data
●2. ListView Builder
●3. Dynamic Text Data

Challenges in Handling Null Values:
●- Manually checking for null before displaying text.
●- Adding multiple conditionals complicates code.
●- Risk of missing null checks, leading to crashes.

4. Introducing RTText for Null Value
Handling

How smart_text_widget (RTText) Handles Null Values:
●- Automatically detects null values.
●- Displays a custom error message or a default placeholder.
●- Supports dynamic data structures like List, Map, or Strings.

Example:
RTText(
text: null,
errorTrue: true,
errorValue: "Null Value Encountered!",
)

5. Handling Null Data in ListView Builder

Scenario: Using RTText in a ListView builder with potentially null data.
Example:
List<String?> items = ["Apple", null, "Banana"];
ListView.builder(
itemCount: items.length,
itemBuilder: (context, index) {
return RTText(text: items[index], errorTrue: true, errorValue: "No Data!");
},
)

Output: Displays "No Data!" for null items.

6. Handling Null Data from an API
Response

Scenario: Fetching data from an API with missing fields.
Example:
Map<String, dynamic>? userData = {"name": null, "age": 30};
RTText(
text: userData?['name'],
errorTrue: true,
errorValue: "Name not available!",
)

Output: Displays "Name not available!" if name field is null.

7. Default Value and Empty Placeholder

Default Value Handling:
●RTText(text: null, defaultValue: "No Name Provided")

Empty Placeholder for List Data:
●RTText(text: [], emptyPlaceholder: "No items to display")

Benefit: Provides a user-friendly message when data is null or
empty.

8. Configurable Error Handling and
Truncation

Truncation of Long Text:
●RTText(text: "This is a very long text",
truncateEnable: true, truncateSize: 15)

Custom Error Message for Invalid Data:
●RTText(text: null, errorTrue: true, errorValue:
"Data Not Found!")

9. Conclusion

Why Choose RTText?
●- Versatile support for strings, lists, and maps.
●- Automatic error handling for null data.
●- Customizable options for truncation and
scrolling.

10. Package Details

●- Package Name: smart_text_widget
●- Version: [Please check latest version]
●- Description: A custom text widget for displaying
strings, handling null values, and more.
●- Dependencies: smart_text_widget
●More details:
https://pub.dev/packages/smart_text_widget
●Publisher : ResearchThinker