Flutter Gallery

Flutter Gallery is a resource to help developers evaluate and use Flutter. It is a collection of Material Design & Cupertino widgets, behaviors, and vignettes implemented with Flutter. We often get asked how one can see Flutter in action, and this gallery demonstrates what Flutter provides and how it behaves in the wild.

Running Flutter Gallery on Flutter's master channel

The Flutter Gallery targets Flutter's master channel. As such, it can take advantage of new SDK features that haven't landed in the stable channel.

If you'd like to run the Flutter Gallery, make sure to switch to the master channel first:

flutter channel master
flutter upgrade

When you're done, use this command to return to the safety of the stable channel:

flutter channel stable
flutter upgrade

Supported Platforms

Flutter Gallery has been built to support multiple platforms. This includes:

• Android
• iOS
• web
• macOS
• Linux
• Windows

An APK, macOS, Linux, and Windows builds are available for download. You can find it on the web at gallery.flutter.dev and on the Google Play Store.

You can build from source yourself for any of these platforms, though, please note desktop support must be enabled. For example, to run the app on Windows:

cd gallery/
flutter config --enable-windows-desktop
flutter create .
flutter run -d windows

Additionally, the UI adapts between mobile and desktop layouts regardless of the platform it runs on. This is determined based on window size as outlined in adaptive.dart.

To include a new splash animation

1. Convert your animation to a .gif file. Ideally, use a background color of 0xFF030303 to ensure the animation blends into the background of the app.

2. Add your new .gif file to the assets directory under assets/splash_effects. Ensure the name follows the format splash_effect_$num.gif. The number should be the next number after the current largest number in the repository.

3. Update the map _effectDurations in splash.dart to include the number of the new .gif as well as its estimated duration. The duration is used to determine how long to display the splash animation at launch.

Generating localized strings and highlighted code segments

To generate localized strings or highlighted code segments, make sure that you have grinder installed by running

flutter pub get

To generate localized strings (see separate README for more details):

flutter pub run grinder l10n

To generate code segments (see separate README for more details):

flutter pub run grinder update-code-segments

Creating a new release (for Flutter org members)

1. Bump the version number up in the pubspec.yaml. Use semantic versioning to determine which number to increment. For example 2.2.0+020200 should become 2.3.0+020300.

2. Create a tag on the master branch of this repo in the form of v2.3.

   • git tag v2.3
   • git push --tags

3. Publish the GH pages web release (using the peanut package).

   • flutter pub global activate peanut
   • flutter pub global run peanut:peanut
   • git push upstream gh-pages:gh-pages
     • git update-ref refs/heads/gh-pages upstream/gh-pages if you need to align with upstream.
   • This step can be removed once fully migrated to firebase hosting.

4. Publish the firebase hosted web release.

   • Log in to the account that has write access to gallery-flutter-dev with firebase login
   • flutter web build
   • firebase deploy

5. Publish the Android release (using the correct signing certificates).

   • Create the app bundle with flutter build appbundle.
   • Upload to the Play store console.
   • Publish the Play store release.
   • Create the APK with flutter build apk (this is for the Github release).

6. Draft a release in Github from the tag you created, call the release Flutter Gallery 2.x

   • Upload the Android APK from above.
   • Create and upload the macOS build by running flutter build macos and zipping the app inside build/macos/Build/Products/Release.
   • Optional: Create and upload the Linux/Windows builds.
   • Publish the release.