In android and ios, there is an option to create or customize image shape, background, etc. For an app icon. But in a flutter, it's not possible.
I used this library,
but they only set icon(not customize for both android ios).
Because if it is possible in a flutter, By using any tool or plugin. It's better.
I assume that you want to show different launcher icon on both platform (android, ios). If yes, kindly take a look at this post
Not long ago, I wrote a sh script to create my flutter app icon. Now I can share it, but I don’t know if it can meet your requirements, you can give it a try.
This script need a source 1024x1024 App Icon first.
Save the content of the following script as a .sh file. e.g. flutter_app_icon_convert.sh.
Don't forget to add executable permission.
chmod +x flutter_app_icon_convert.sh
Then install the ImageMagick image tool if you not install it yet.
brew install imagemagick
And then use the script to create the flutter app icons (Both Android and iOS).
In your flutter project folder:
sh your_path/flutter_app_icon_convert.sh your_source_app_icon_1024x1024.png .
#!/bin/sh
# echo font color
# https://stackoverflow.com/questions/5947742/how-to-change-the-output-color-of-echo-in-linux
#
# ANSI escape codes:
#
# Black 0;30 Dark Gray 1;30
# Red 0;31 Light Red 1;31
# Green 0;32 Light Green 1;32
# Brown/Orange 0;33 Yellow 1;33
# Blue 0;34 Light Blue 1;34
# Purple 0;35 Light Purple 1;35
# Cyan 0;36 Light Cyan 1;36
# Light Gray 0;37 White 1;37
#
#
RED='\033[0;31m'
GREEN='\033[0;32m'
NO_COLOR='\033[0m'
convertImage() {
src=$1
srcdir=$(dirname "$src")
if test -d "$2"; then
des="$(
cd "$2" || exit
pwd
)"
build512=0
else
build512=1
des="$(
cd "${srcdir}" || exit
pwd
)/AppIcons"
fi
echo "Icons will be saved to ：${GREEN}${des}${NO_COLOR}"
mkdir -p "$des"
echo 'creating ios icons...'
ios=${des}/ios/Runner/Assets.xcassets/AppIcon.appiconset
mkdir -p "$ios"
convert -resize 20x20 "$src" "$ios"/Icon-App-20x20@1x.png
convert -resize 40x40 "$src" "$ios"/Icon-App-20x20@2x.png
convert -resize 60x60 "$src" "$ios"/Icon-App-20x20@3x.png
convert -resize 29x29 "$src" "$ios"/Icon-App-29x29@1x.png
convert -resize 58x58 "$src" "$ios"/Icon-App-29x29@2x.png
convert -resize 87x87 "$src" "$ios"/Icon-App-29x29@3x.png
convert -resize 40x40 "$src" "$ios"/Icon-App-40x40@1x.png
convert -resize 80x80 "$src" "$ios"/Icon-App-40x40@2x.png
convert -resize 120x120 "$src" "$ios"/Icon-App-40x40@3x.png
convert -resize 120x120 "$src" "$ios"/Icon-App-60x60@2x.png
convert -resize 180x180 "$src" "$ios"/Icon-App-60x60@3x.png
convert -resize 76x76 "$src" "$ios"/Icon-App-76x76@1x.png
convert -resize 152x152 "$src" "$ios"/Icon-App-76x76@2x.png
convert -resize 167x167 "$src" "$ios"/Icon-App-83.5x83.5@2x.png
convert -resize 1024x1024 "$src" "$ios"/Icon-App-1024x1024@1x.png
echo 'creating android icons...'
android=${des}/android/app/src/main/res
mkdir -p "$android"
mkdir -p "$android"/mipmap-xxxhdpi
mkdir -p "$android"/mipmap-xxhdpi
mkdir -p "$android"/mipmap-xhdpi
mkdir -p "$android"/mipmap-mdpi
mkdir -p "$android"/mipmap-hdpi
convert -resize 192x192 "$src" "$android"/mipmap-xxxhdpi/ic_launcher.png
convert -resize 144x144 "$src" "$android"/mipmap-xxhdpi/ic_launcher.png
convert -resize 96x96 "$src" "$android"/mipmap-xhdpi/ic_launcher.png
convert -resize 48x48 "$src" "$android"/mipmap-mdpi/ic_launcher.png
convert -resize 72x72 "$src" "$android"/mipmap-hdpi/ic_launcher.png
echo ''
if [ $build512 = 1 ]; then
convert -resize 512x512 "$src" "$des"/Icon-App-512x512.png
else
echo 'if you want to create an extra 512x512 icon, use command:'
echo "convert -resize 512x512 $src $srcdir/Icon-App-512x512.png"
echo ''
fi
echo "${GREEN}Done${NO_COLOR}."
echo ''
}
printHelp() {
echo 'This script use "ImageMagick" image tool to convert 1024x1024 App Icon to flutter Android and iOS icons.'
echo 'So you need install "ImageMagick" first: https://imagemagick.org/script/download.php'
echo 'This script can accept 2 parameters. The first is your srouce App Icon, the size should be 1024x1024.'
echo 'The second parameter is optional and specifies the save path of the generated icons. If not specified, it will be saved to the folder where the source icon is located, and an additional 512x512 icon will be generated.'
}
if command -v convert >/dev/null 2>&1; then
if test "$1" = "-h" -o "$1" = "--help"; then
printHelp
elif test -f "$1"; then
convertImage "$1" "$2"
else
echo "${RED}Error${NO_COLOR}: please provide your 1024x1024 source app icon file."
echo ''
printHelp
fi
else
echo "${RED}Error${NO_COLOR}:ImageMagick convert image tools not installed，you can use homebrew to intall it:"
echo 'brew install imagemagick'
fi
