问题

When I create an app with flutter create command, the flutter logo is used as an application icon for both platforms.

If I want to change the app icon, shall I go to both platforms directories and replace images there?, by platforms directories I mean myapp/ios/Runner/Assets.xcassets/AppIcon.appiconset for iOS and myapp/android/app/src/main/res for Android.

Or is it possible to define an image as a Flutter Asset and the icons are generated somehow ?.

回答1:

Flutter Launcher Icons has been designed to help quickly generate launcher icons for both Android and iOS: https://pub.dartlang.org/packages/flutter_launcher_icons

Add the package to your pubspec.yaml file (within your Flutter project) to use it
Within pubspec.yaml file specify the path of the icon you wish to use for the app and then choose whether you want to use the icon for the iOS app, Android app or both.
Run the package
Voila! The default launcher icons have now been replaced with your custom icon

I'm hoping to add a video to the GitHub README to demonstrate it

Video showing how to run the tool can be found here.

If anyone wants to suggest improvements / report bugs, please add it as an issue on the GitHub project.

Update: As of Wednesday 24th January 2018, you should be able to create new icons without overriding the old existing launcher icons in your Flutter project.

Update 2: As of v0.4.0 (8th June 2018) you can specify one image for your Android icon and a separate image for your iOS icon.

Update 3: As of v0.5.2 (20th June 2018) you can now add adaptive launcher icons for the Android app of your Flutter project

回答2:

Follow simple steps:

Add flutter_launcher_icons Plugin to pubspec.yaml

e.g.

dev_dependencies: 
  flutter_test:
    sdk: flutter

  flutter_launcher_icons: "^0.6.1"

flutter_icons:
  image_path: "icon/icon.png" 
  android: true
  ios: true

Prepare an app icon for the specified path. e.g. icon/icon.png
Execute command on the terminal to Create app icons:

$ flutter pub get

$ flutter pub pub run flutter_launcher_icons:main

To check check all available options and to set different icons for android and iOS please refer this

Hope this will helps others.

回答3:

Setting the launcher icons like a native developer

I was having some trouble using and understanding the flutter_launcher_icons package. This answer is how you would do it if you were creating an app for Android or iOS natively. It is pretty fast and easy once you have done it a few times.

Android

Android launcher icons have both a foreground and a background layer.

(image adapted from Android documentation)

The easiest way to create launcher icons for Android is to use the Asset Studio that is available right in Android Studio (sorry VSCode users). You don't even have to leave your Flutter project.

Right click the android folder in your project outline. Go to New > Image Asset. Now you can select an image to create your launcher icon from.

Note: I usually use a 1024x1024 pixel image but you should certainly use nothing smaller that 512x512. If you are using Gimp or Inkscape, you should have two layers, one for the foreground and one for the background. The foreground image should have transparent areas for the background layer to show through.

(lion clipart from here)

This will replace the current launcher icons. You can find the generated icons in the mipmap folders:

If you would prefer to create the launcher icons manually, see this answer for help.

Finally, make sure that the launcher icon name in the AndroidManifest is the same as what you called it above (ic_launcher by default):

application android:icon="@mipmap/ic_launcher"

Run the app in the emulator to confirm that the launcher icon was created successfully.

iOS

I always used to individually resize my iOS icons by hand, but if you have a Mac, there is a free app in the Mac App Store called Icon Set Creator. You give it an image (of at least 1024x1024 pixels) and it will spit out all the sizes that you need (plus the Contents.json file). Thanks to this answer for the suggestion.

iOS icons should not have any transparency. See more guidelines here.

After you have created the icon set, start Xcode (assuming you have a Mac) and use it to open the ios folder in your Flutter project. Then go to Runner > Assets.xcassets and delete the AppIcon item.

After that right-click and choose Import.... Choose the icon set that you just created.

That's it. Confirm that the icon was created by running the app in the simulator.

If you don't have a Mac...

You can still create all of the images by hand. In your Flutter project go to ios/Runner/Assets.xcassets/AppIcon.appiconset.

The image sizes that you need are the multiplied sizes in the filename. For example, Icon-App-29x29@3x.png would be 29 times 3, that is, 87 pixels square. You either need to keep the same icon names or edit the JSON file.

回答4:

You have to replace the Flutter icon files with images of your own. This site will help you turn your png into launcher icons of various sizes:

https://romannurik.github.io/AndroidAssetStudio/icons-launcher.html

回答5:

I would suggest You to use this website Linked Below

App Icon Creator

Step-1: upload The Image,

Step-2: Make necessary Changes And Click on download(dont change the file name)

Step-3: Extract the Downloaded Zip File In the respective folder

android/app/main/src/res

回答6:

Best way is to change launcher icons separately for both iOS and Android.

Change the icons in iOS and Android module separately. The plugin produces different size icons from the same icon which are distorted.

Follow this link: https://flutter.dev/docs/deployment/android

回答7:

Best & Recommended way to set App Icon in Flutter.

I found one plugin to set app icon in flutter named “flutter_launcher_icons”. We'll use this plugin to set the app icon in flutter.

Add this plugin in pubspec.yaml file in project root directory. Please check below code,

dependencies:
flutter:
sdk: flutter
cupertino_icons: ^0.1.2
flutter_launcher_icons: ^0.7.2+1

Save the file and run flutter pub get on terminal.

Create a folder assets in the root of the project in folder assets also create a folder icon and place your app icon inside this folder. I will recommend to user 1024x1024 app icon size. I have placed app icon inside icon folder and now I have app icon path as assets/icon/icon.png
Now, in pubspec.yaml add the below code,

flutter_icons:
android: "launcher_icon"
ios: true
image_path: "assets/icon/icon.png"
Save the file and run flutter pub get on terminal. After running command run second command as below

flutter pub run flutter_launcher_icons:main -f pubspec.yaml

Then Run App

回答8:

you can achieve this by using flutter_launcher_icons in pubspec.yaml

another way is to use one for android and another one for iOS

回答9:

I have changed it in the following steps:

1) please add this dependency on your pubspec.yaml page

 dev_dependencies:
  flutter_test:
    sdk: flutter
  flutter_launcher_icons: ^0.7.4

2) you have to upload an image/icon on your project which you want to see as a launcher icon. (i have created a folder name:image in my project then upload the logo.png in the image folder). Now you have to add the below codes and paste your image path on image_path: in pubspec.yaml page.

flutter_icons:
  image_path: "images/logo.png"
  android: true
  ios: true

3) Go to terminal and execute this command:

flutter pub get

4) After executing the command then enter below command:

flutter pub run flutter_launcher_icons:main

5) Done

N.B: (of course add an updated dependency from

https://pub.dev/packages/flutter_launcher_icons#-installing-tab-

)

来源：https://stackoverflow.com/questions/43928702/how-to-change-the-application-launcher-icon-on-flutter

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application-icon

How to change the application launcher icon on Flutter?

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