add splash screen

app/build.gradle

@@ -196,5 +196,7 @@ dependencies {
     // implementation "androidx.work:work-runtime:$work_version"
     implementation "androidx.work:work-runtime-ktx:$work_version"
 
+    implementation "androidx.core:core-splashscreen:1.0.0-beta01"
+
     implementation project(':geeksville-androidlib')
 }

app/src/main/AndroidManifest.xml

@@ -128,7 +128,7 @@
             android:label="@string/app_name"
             android:screenOrientation="portrait"
             android:windowSoftInputMode="stateAlwaysHidden"
-            android:theme="@style/AppTheme"
+            android:theme="@style/Theme.App.Starting"
             android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />

app/src/main/java/com/geeksville/mesh/MainActivity.kt

@@ -33,6 +33,7 @@ import androidx.appcompat.app.AppCompatDelegate
 import androidx.appcompat.widget.Toolbar
 import androidx.core.app.ActivityCompat
 import androidx.core.content.ContextCompat
+import androidx.core.splashscreen.SplashScreen.Companion.installSplashScreen
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.FragmentManager
 import androidx.fragment.app.FragmentTransaction
@@ -477,6 +478,7 @@ class MainActivity : AppCompatActivity(), Logging,
     }
 
     override fun onCreate(savedInstanceState: Bundle?) {
+        installSplashScreen()
         super.onCreate(savedInstanceState)
 
         binding = ActivityMainBinding.inflate(layoutInflater)

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

@@ -73,4 +73,18 @@
         <item name="materialThemeOverlay">@style/MyThemeOverlay_Toolbar</item>
     </style>
 
+    <style name="Theme.App.Starting" parent="Theme.SplashScreen">
+        // Set the splash screen background, animated icon, and animation duration.
+        <item name="windowSplashScreenBackground">@color/selectedColor</item>
+
+        // Use windowSplashScreenAnimatedIcon to add either a drawable or an
+        // animated drawable. One of these is required.
+        <item name="windowSplashScreenAnimatedIcon">@drawable/ic_launcher2_foreground</item>
+         <item name="windowSplashScreenAnimationDuration">1000</item>  # Required for
+        # animated icons
+
+        // Set the theme of the Activity that directly follows your splash screen.
+        <item name="postSplashScreenTheme">@style/AppTheme</item>  # Required.
+    </style>
+
 </resources>