Add splash for android < 12 so app is not completely blank during process creation

app/build.gradle.kts

@@ -171,7 +171,7 @@ dependencies {
     // https://developer.android.com/studio/write/java8-support#library-desugaring-versions
     coreLibraryDesugaring("com.android.tools:desugar_jdk_libs:1.2.2")
     implementation(libs.appyx.core)
-
+    implementation(libs.androidx.splash)
     implementation(libs.androidx.corektx)
     implementation(libs.androidx.lifecycle.runtime)
     implementation(libs.androidx.activity.compose)

app/src/main/AndroidManifest.xml

@@ -31,6 +31,7 @@
         tools:targetApi="33">
         <activity
             android:name=".MainActivity"
+            android:theme="@style/Theme.ElementX.Splash"
             android:configChanges="orientation|screenSize|screenLayout|keyboardHidden"
             android:exported="true"
             android:windowSoftInputMode="adjustResize"

app/src/main/kotlin/io/element/android/x/MainActivity.kt

@@ -22,18 +22,20 @@ import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.ui.Modifier
+import androidx.core.splashscreen.SplashScreen.Companion.installSplashScreen
 import androidx.core.view.WindowCompat
 import com.bumble.appyx.core.integration.NodeHost
 import com.bumble.appyx.core.integrationpoint.NodeComponentActivity
 import io.element.android.libraries.architecture.bindings
-import io.element.android.libraries.di.DaggerComponentOwner
 import io.element.android.libraries.designsystem.ElementXTheme
+import io.element.android.libraries.di.DaggerComponentOwner
 import io.element.android.x.di.AppBindings
 import io.element.android.x.node.RootFlowNode
 
 class MainActivity : NodeComponentActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
+        installSplashScreen()
         super.onCreate(savedInstanceState)
         val appBindings = bindings<AppBindings>()
         appBindings.matrixClientsHolder().restore(savedInstanceState)

app/src/main/res/drawable/splash_icon.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<inset
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:drawable="@mipmap/ic_launcher_round"
+    android:insetTop="80dp"
+    android:insetRight="80dp"
+    android:insetBottom="80dp"
+    android:insetLeft="80dp" />

app/src/main/res/values-night/themes.xml

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (c) 2023 New Vector Ltd
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
+<resources>
+
+    <style name="Theme.ElementX.Splash" parent="Theme.SplashScreen">
+        <item name="windowSplashScreenBackground">@color/black</item>
+        <item name="windowSplashScreenAnimatedIcon">@drawable/splash_icon</item>
+        <item name="postSplashScreenTheme">@style/Theme.ElementX</item>
+    </style>
+
+    <style name="Theme.ElementX" parent="Theme.ElementAndroid" />
+</resources>

app/src/main/res/values/themes.xml

@@ -16,6 +16,10 @@
   -->
 
 <resources>
-
+    <style name="Theme.ElementX.Splash" parent="Theme.SplashScreen.IconBackground">
+        <item name="windowSplashScreenBackground">@color/white</item>
+        <item name="windowSplashScreenAnimatedIcon">@drawable/splash_icon</item>
+        <item name="postSplashScreenTheme">@style/Theme.ElementX</item>
+    </style>
     <style name="Theme.ElementX" parent="Theme.ElementAndroid" />
 </resources>

gradle/libs.versions.toml

@@ -66,6 +66,7 @@ androidx_recyclerview = { module = "androidx.recyclerview:recyclerview", version
 androidx_lifecycle_runtime = { module = "androidx.lifecycle:lifecycle-runtime-ktx", version.ref = "lifecycle" }
 androidx_lifecycle_compose = { module = "androidx.lifecycle:compose", version.ref = "lifecycle" }
 androidx_lifecycle_process = { module = "androidx.lifecycle:lifecycle-process", version.ref = "lifecycle" }
+androidx_splash = "androidx.core:core-splashscreen:1.0.0"
 
 androidx_activity_compose = { module = "androidx.activity:activity-compose", version.ref = "activity_compose" }
 androidx_startup = { module = "androidx.startup:startup-runtime", version.ref = "startup" }