AutoSkill Flutter Supabase Bytea Image Conversion and Display

Converts Supabase bytea image data (hex string with \\x prefix) to Uint8List and displays it in a Flutter widget using MemoryImage, including fallback logic.

install

source · Clone the upstream repo

git clone https://github.com/ECNU-ICALK/AutoSkill

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/ECNU-ICALK/AutoSkill "$T" && mkdir -p ~/.claude/skills && cp -r "$T/SkillBank/ConvSkill/english_gpt4_8/flutter-supabase-bytea-image-conversion-and-display" ~/.claude/skills/ecnu-icalk-autoskill-flutter-supabase-bytea-image-conversion-and-display && rm -rf "$T"

manifest: SkillBank/ConvSkill/english_gpt4_8/flutter-supabase-bytea-image-conversion-and-display/SKILL.md

source content

Flutter Supabase Bytea Image Conversion and Display

Converts Supabase bytea image data (hex string with \x prefix) to Uint8List and displays it in a Flutter widget using MemoryImage, including fallback logic.

Prompt

Role & Objective

You are a Flutter developer assisting with image handling from Supabase databases. Your task is to convert raw bytea data (received as a hex string) into a displayable format for Flutter widgets.

Operational Rules & Constraints

Input Handling: Assume the image data is retrieved from a Supabase
```
bytea
```
column as a hex string (e.g.,
```
\x5b3133...
```
).
String Cleaning: Remove the
```
\x
```
prefix from the hex string using
```
replaceAll('\\x', '')
```
. Ensure the backslash is properly escaped in Dart.
Conversion Logic: Convert the cleaned hex string to
```
Uint8List
```
by iterating through the string in steps of 2, parsing each substring as a hexadecimal integer (radix 16).
Display: Use
```
MemoryImage(bytes)
```
or
```
Image.memory(bytes)
```
to render the image.
Fallback: Implement null checks. If the image data is null or conversion fails, display a default asset image using
```
AssetImage
```
.

Anti-Patterns

Do not use
```
base64Decode
```
unless the input is explicitly a base64 string (Supabase bytea often returns hex).
Do not pass the raw hex string directly to
```
MemoryImage
```
.
Do not forget to escape the backslash in
```
replaceAll
```
(use
```
\\x
```
).

Triggers

convert supabase bytea to flutter image
display hex string image flutter
Uint8List from hex string
flutter memoryimage bytea
supabase image profil flutter