android_splash_screen – Flutter Example

In this guide, we’ll delve into implementing an animated splash screen for Android using Flutter, focusing on devices running Android 12 or later. We aim to demonstrate how to seamlessly integrate splash screens into Flutter apps and ensure a smooth transition to the UI.

Introduction

In this guide, we’ll explore how to implement an animated splash screen for Android devices using Flutter, specifically targeting devices running at least Android 12, which introduces the new SplashScreen API.

Goals

Our objectives are twofold:

1. Demonstrate the compatibility of animated splash screens with Flutter apps on Android.
2. Showcase the smooth transition achievable by integrating a splash screen into a Flutter UI.

Utilizing the SplashScreen API

To achieve our goals, we’ll leverage the new SplashScreen API introduced in Android 12. This API allows for seamless integration of animated splash screens into Flutter applications.

Important Considerations

Before proceeding, there are some crucial steps to take:

Remove Deprecated Code

Ensure to remove any deprecated code related to splash screen implementation. This includes removing the definition of io.flutter.embedding.android.SplashScreenDrawable in the /android/app/src/main/AndroidManifest.xml file and any implementation of provideSplashScreen() in the /android/app/src/main/kotlin/MainActivity.kt file.

Example:

<!-- Old SplashScreenDrawable definition -->
<activity
    android:name=".MainActivity"
    android:launchMode="singleTop"
    android:theme="@style/LaunchTheme"
    android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
    android:hardwareAccelerated="true"
    android:windowSoftInputMode="adjustResize">
    <meta-data
        android:name="io.flutter.embedding.android.SplashScreenDrawable"
        android:resource="@drawable/launch_background" />
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>

Modify Android Build Files

Update the necessary Android build files:

• Set compileSdkVersion to 31 in /android/app/build.gradle.
• Update ext.kotlin_version to the latest Kotlin extension version in /android/build.gradle.

Example:

// build.gradle (app)
android {
    compileSdkVersion 31
    ...
}

// build.gradle (project)
buildscript {
    ext.kotlin_version = '1.5.31'
    ...
}

Timing the Splash Screen Animation

To ensure a seamless transition between the animated splash screen and the Flutter UI, handle cases where the Flutter UI is ready before the animation finishes and vice versa. This involves overriding onFlutterUiDisplayed() and onFlutterUiNoLongerDisplayed() in /android/app/src/main/kotlin/com/example/splash-screen-sample/MainActivity.kt.

Additional Resources and Support

For further assistance and information:

• Refer to the Android 12 Splash Screen Documentation.
• Explore Flutter’s guidance on Adding a Splash Screen to Your App.
• If encountering issues with the sample provided, please file an issue in the main Flutter repository.

Section	Content
Introduction	In this guide, we’ll delve into implementing an animated splash screen for Android devices using Flutter. This specifically targets devices running Android 12 and introduces the new SplashScreen API.
Goals	Our objectives are twofold: demonstrate the compatibility of animated splash screens with Flutter apps on Android and showcase the smooth transition achievable by integrating a splash screen into a Flutter UI.
Utilizing the SplashScreen API	We’ll leverage the new SplashScreen API introduced in Android 12. This API facilitates seamless integration of animated splash screens into Flutter applications.
Important Considerations	Before proceeding, there are crucial steps to take: remove any deprecated code related to splash screen implementation and update the necessary Android build files.
Remove Deprecated Code	Ensure removal of deprecated code, such as the definition of io.flutter.embedding.android.SplashScreenDrawable in the AndroidManifest.xml file and any implementation of provideSplashScreen() in the MainActivity.kt file.
Modify Android Build Files	Update the Android build files by setting compileSdkVersion to 31 and updating ext.kotlin_version to the latest Kotlin extension version.
Timing the Splash Screen Animation	To ensure a seamless transition between the animated splash screen and the Flutter UI, handle cases where the Flutter UI is ready before the animation finishes and vice versa by overriding certain methods in the MainActivity.kt file.
Additional Resources and Support	For further assistance and information, refer to the Android 12 Splash Screen Documentation, Flutter’s guidance on Adding a Splash Screen to Your App, and file any encountered issues in the main Flutter repository.

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FAQs

How can I implement an animated splash screen in my Flutter app for Android devices?

To implement an animated splash screen in your Flutter app for Android devices, you can leverage the new SplashScreen API introduced in Android 12. This API allows for seamless integration of animated splash screens into Flutter applications.

What are some important considerations before implementing a splash screen?

Before proceeding with the implementation of a splash screen, it’s essential to take the following steps:

• Remove any deprecated code related to splash screen implementation, such as the definition of io.flutter.embedding.android.SplashScreenDrawable in the /android/app/src/main/AndroidManifest.xml file and any implementation of provideSplashScreen() in the /android/app/src/main/kotlin/MainActivity.kt file.
• Update the necessary Android build files by setting compileSdkVersion to 31 in /android/app/build.gradle and updating ext.kotlin_version to the latest Kotlin extension version in /android/build.gradle.

How can I ensure a smooth transition between the animated splash screen and the Flutter UI?

To ensure a seamless transition between the animated splash screen and the Flutter UI, you need to handle cases where the Flutter UI is ready before the animation finishes and vice versa. This can be achieved by overriding onFlutterUiDisplayed() and onFlutterUiNoLongerDisplayed() in /android/app/src/main/kotlin/com/example/splash-screen-sample/MainActivity.kt.

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Where can I find additional resources and support for implementing a splash screen in my Flutter app?

For further assistance and information regarding implementing a splash screen in your Flutter app, you can refer to the following resources:

• Android 12 Splash Screen Documentation
• Flutter’s guidance on Adding a Splash Screen to Your App
• If you encounter any issues with the sample provided or have general questions, please file an issue in the main Flutter repository.