Open android
folder in Android Studio.
Right-click the res folder and select New > Image Asset.
In the Icon Type field, select Launcher Icons (Adaptive & Legacy).
In the Foreground Layer tab, select an Asset Type, and then specify the asset in the field underneath:
Name - If you don't want to use the default name, type a new name. If that resource name already exists in the project, as indicated by an error at the bottom of the wizard, it's overwritten. The name can contain lowercase characters, underscores, and digits only.
Trim - To adjust the margin between the icon graphic and border in the source asset, select Yes. This operation removes transparent space, while preserving the aspect ratio. To leave the source asset unchanged, select No.
Color - To change the color for a Clip Art or Text icon, click the field. In the Select Color dialog, specify a color and then click Choose. The new value appears in the field.
Resize - Use the slider to specify a scaling factor in percent to resize an Image, Clip Art, or Text icon. This control is disabled for the background layer when you specify a Color asset type. Click Next.
You can create an image filled with color #fe6017 and use it for adaptive_icon_background as in example
flutter_icons:
android: "launcher_icon"
ios: false
image_path: "assets/icon/icon.png"
adaptive_icon_background: "assets/icon/icon-background.png"
adaptive_icon_foreground: "assets/icon/icon.png"
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