Deprecated Splash Screen API Migration

Prior to Flutter 2.5, Flutter apps could add a splash screen by defining it within the metadata of their application manifest file (AndroidManifest.xml), by implementing provideSplashScreen within their FlutterActivity, or both. This would display momentarily in between the time after the Android launch screen is shown and when Flutter has drawn the first frame. This approach is now deprecated as of Flutter 2.5. Flutter now automatically keeps the Android launch screen displayed until it draws the first frame.

To migrate from defining a custom splash screen to just defining a custom launch screen for your application, follow the steps that correspond to how your application’s custom splash screen was defined prior to the 2.5 release.

Custom splash screen defined in FlutterActivity

Locate your application’s implementation of provideSplashScreen() within its FlutterActivity and delete it. This implementation should involve the construction of your application’s custom splash screen as a Drawable. For example:

@Override
public SplashScreen provideSplashScreen() {
    // ...
    return new DrawableSplashScreen(
        new SomeDrawable(
            ContextCompat.getDrawable(this, R.some_splash_screen)));
}

Use the steps in the section directly following to ensure that your Drawable splash screen (R.some_splash_screen in the previous example) is properly configured as your application’s custom launch screen.

Custom splash screen defined in Manifest

Locate your application’s AndroidManifest.xml file. Within this file, find the activity element. Within this element, identify the android:theme attribute and the meta-data element that defines a splash screen as an io.flutter.embedding.android.SplashScreenDrawable, and update it. For example:
```
<activity
    // ...
    android:theme="@style/SomeTheme">
  // ...
  <meta-data
      android:name="io.flutter.embedding.android.SplashScreenDrawable"
      android:resource="@drawable/some_splash_screen"
      />
</activity>
```
If the android:theme attribute isn’t specified, add the attribute and define a launch theme for your application’s launch screen.
Delete the meta-data element, as Flutter no longer uses that, but it can cause a crash.

Locate the definition of the theme specified by the android:theme attribute within your application’s style resources. This theme specifies the launch theme of your application. Ensure that the style attribute configures the android:windowBackground attribute with your custom splash screen. For example:

<resources>
    <style
        name="SomeTheme"
        // ...
        >
        <!-- Show a splash screen on the activity. Automatically removed when
             Flutter draws its first frame -->
        <item name="android:windowBackground">@drawable/some_splash_screen</item>
    </style>
</resources>