camsim99 / splash-screen-sample

Splash Screen Sample

A Flutter app that exemplifies how to implement an animated splash screen for Android devices running at least Android 12, the version that supplies the new SplashScreen API.

NOTE: There is a pub package available to implement static splash screens in your Flutter app: flutter_native_splash.

Goals

• Demonstrate the compatibility of animated splash screens and Flutter apps running on Android
• Demonstrate the smoothness achievable by a splash screen as a transition to the Flutter UI

The Important Bits

Remove deprecated code

When creating a Flutter app, the Android code generated may include the deprecated implementation of a splash screen. This includes a definition of io.flutter.embedding.android.SplashScreenDrawable in the /android/app/src/main/AndroidManifest.xml file and an implementation of provideSplashScreen() in the /android/app/src/main/kotlin/MainActivity.kt file. Make sure to remove this code.

Modify Android build files

In order to support the Android 12 SplashScreen API, you will need to:

1. update the Android compileSdkVersion to 31 in the /android/app/build.gradle file, and
2. update the ext.kotlin_version to the latest Kotlin extension version (1.5.31 at the time of publication) in the /android/build.gradle file.

Timing the splash screen animation

In order to ensure a smooth transition between the animated splash screen and the Flutter UI displaying for the first time, be sure to handle both the case where the Flutter UI is ready to be displayed before the animation finishes and vice versa. This can be done by overriding onFlutterUiDisplayed() and onFlutterUiNoLongerDisplayed() in /android/app/src/main/kotlin/com/example/splash-screen-sample/MainActivity.kt, the implementation of the FlutterActivity in this project.

Questions/Issues

If you have a general question about splash screens or their implementation in Flutter, the best places to go are:

• Android 12 Splash Screen Documentation
• Flutter Guidance on Adding a Splash Screen to Your App

If you run into an issue with the sample itself, please file an issue in the main Flutter repo.