fix: Use minSdk 26 and correct minSdk for GameActivity

This also fixes a nullpointer exception in hideSystemUi that has been observed on Android API 28 (Samsung Galaxy J3)

Author: leomeinel

docs-template/EXAMPLE_README.md.tpl

@@ -193,9 +193,9 @@ adb uninstall org.bevyengine.example
 
 **⚠️ Note:** If you are using `bevy_audio` the minimum supported Android API version is 26 (Android 8/Oreo).
 
-In its example, Bevy uses Android API 36 as `targetSdk` to be able to benefit from security and performance improvements. For backwards compatibility, the example specifies Android API 31 as `minSdk`. This approach is recommended in the [Android Developers documentation](https://developer.android.com/google/play/requirements/target-sdk#why-target).
+In its example, Bevy uses Android API 36 as `targetSdk` to be able to benefit from security and performance improvements. For backwards compatibility, the example specifies Android API 26 as `minSdk`. This approach is recommended in the [Android Developers documentation](https://developer.android.com/google/play/requirements/target-sdk#why-target).
 
-Bevy uses [`GameActivity`](https://developer.android.com/games/agdk/game-activity), which only works for Android API 31 and higher. If you want to use an older API, you need to switch to [`NativeActivity`](https://developer.android.com/reference/android/app/NativeActivity).
+Bevy uses [`GameActivity`](https://developer.android.com/games/agdk/game-activity), which only works for Android API 23 and higher. If you want to use an older API, you need to switch to [`NativeActivity`](https://developer.android.com/reference/android/app/NativeActivity).
 
 You can follow the following steps to switch from [`GameActivity`](https://developer.android.com/games/agdk/game-activity) to [`NativeActivity`](https://developer.android.com/reference/android/app/NativeActivity):
 
@@ -263,27 +263,18 @@ You can follow the following steps to switch from [`GameActivity`](https://devel
     ```
 
     </details>
-3. Change `minSdk` (optional) and remove unnecessary dependencies in `android/app/build.gradle.kts`.
+3. Remove unnecessary dependencies in `android/app/build.gradle.kts`.
     <details>
     <summary>Required Changes (Example)</summary>
 
     ```diff
     --- a/examples/mobile/android/app/build.gradle.kts
-    +++ b/examples/mobile/android/app/build.gradle.kts
-        defaultConfig {
-            applicationId = "org.bevyengine.example"
-    -        minSdk = 31
-    +        minSdk = 26
-            targetSdk = 36
-            // NOTE: Increase by 1 on each release
-            versionCode = 1
-    --- a/examples/mobile/android/app/build.gradle.kts
     +++ b/examples/mobile/android/app/build.gradle.kts
     dependencies {
         implementation(libs.appcompat)
         implementation(libs.core)
         implementation(libs.material)
-    -   implementation(libs.games.activity)
+    -    implementation(libs.games.activity)
         implementation(libs.core.ktx)
     }
     ```

examples/README.md

@@ -801,9 +801,9 @@ adb uninstall org.bevyengine.example
 
 **⚠️ Note:** If you are using `bevy_audio` the minimum supported Android API version is 26 (Android 8/Oreo).
 
-In its example, Bevy uses Android API 36 as `targetSdk` to be able to benefit from security and performance improvements. For backwards compatibility, the example specifies Android API 31 as `minSdk`. This approach is recommended in the [Android Developers documentation](https://developer.android.com/google/play/requirements/target-sdk#why-target).
+In its example, Bevy uses Android API 36 as `targetSdk` to be able to benefit from security and performance improvements. For backwards compatibility, the example specifies Android API 26 as `minSdk`. This approach is recommended in the [Android Developers documentation](https://developer.android.com/google/play/requirements/target-sdk#why-target).
 
-Bevy uses [`GameActivity`](https://developer.android.com/games/agdk/game-activity), which only works for Android API 31 and higher. If you want to use an older API, you need to switch to [`NativeActivity`](https://developer.android.com/reference/android/app/NativeActivity).
+Bevy uses [`GameActivity`](https://developer.android.com/games/agdk/game-activity), which only works for Android API 23 and higher. If you want to use an older API, you need to switch to [`NativeActivity`](https://developer.android.com/reference/android/app/NativeActivity).
 
 You can follow the following steps to switch from [`GameActivity`](https://developer.android.com/games/agdk/game-activity) to [`NativeActivity`](https://developer.android.com/reference/android/app/NativeActivity):
 
@@ -871,27 +871,18 @@ You can follow the following steps to switch from [`GameActivity`](https://devel
     ```
 
     </details>
-3. Change `minSdk` (optional) and remove unnecessary dependencies in `android/app/build.gradle.kts`.
+3. Remove unnecessary dependencies in `android/app/build.gradle.kts`.
     <details>
     <summary>Required Changes (Example)</summary>
 
     ```diff
     --- a/examples/mobile/android/app/build.gradle.kts
-    +++ b/examples/mobile/android/app/build.gradle.kts
-        defaultConfig {
-            applicationId = "org.bevyengine.example"
-    -        minSdk = 31
-    +        minSdk = 26
-            targetSdk = 36
-            // NOTE: Increase by 1 on each release
-            versionCode = 1
-    --- a/examples/mobile/android/app/build.gradle.kts
     +++ b/examples/mobile/android/app/build.gradle.kts
     dependencies {
         implementation(libs.appcompat)
         implementation(libs.core)
         implementation(libs.material)
-    -   implementation(libs.games.activity)
+    -    implementation(libs.games.activity)
         implementation(libs.core.ktx)
     }
     ```

examples/mobile/android/app/build.gradle.kts

@@ -24,7 +24,8 @@ android {
     // https://developer.android.com/reference/tools/gradle-api/9.1/com/android/build/api/dsl/DefaultConfig
     defaultConfig {
         applicationId = "org.bevyengine.example"
-        minSdk = 31
+        // NOTE: `minSdk` is 26 because this is the minimum supported by `bevy_audio`
+        minSdk = 26
         targetSdk = 36
         // NOTE: Increase by 1 on each release
         versionCode = 1

examples/mobile/android/app/src/main/kotlin/org/bevyengine/example/MainActivity.kt

@@ -42,13 +42,13 @@ class MainActivity : GameActivity() {
      * Hide system UI.
      */
     private fun hideSystemUi() {
-        val windowInsetsController =
-            WindowCompat.getInsetsController(window, window.decorView)
-
-        // Show bars if swiping
-        windowInsetsController.systemBarsBehavior = WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
-        // Hide both the status bar and the navigation bar.
-        windowInsetsController.hide(WindowInsetsCompat.Type.systemBars())
+        window.decorView.post {
+            val controller = WindowCompat.getInsetsController(window, window.decorView)
+            // Show bars if swiping
+            controller.systemBarsBehavior = WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
+            // Hide both the status bar and the navigation bar.
+            controller.hide(WindowInsetsCompat.Type.systemBars())
+        }
     }
 
     companion object {