Add a splash screen to Wear to improve cold start experience (#1889)

wear/src/main/AndroidManifest.xml

@@ -26,7 +26,9 @@
             android:name="com.google.android.wearable.standalone"
             android:value="true" />
 
-        <activity android:name=".home.HomeActivity"
+        <activity android:name=".home.HomeActivity" />
+        <activity android:name=".splash.SplashActivity"
+            android:theme="@style/SplashTheme"
             android:label="@string/app_name"
             android:exported="true">
             <intent-filter>

wear/src/main/java/io/homeassistant/companion/android/splash/SplashActivity.kt

@@ -0,0 +1,16 @@
+package io.homeassistant.companion.android.splash
+
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import io.homeassistant.companion.android.home.HomeActivity
+
+class SplashActivity : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        val intent = HomeActivity.newInstance(this)
+        startActivity(intent)
+        finish()
+    }
+}

wear/src/main/res/drawable/splash_background.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <item android:drawable="@color/black" />
+
+    <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@drawable/logo" />
+    </item>
+
+</layer-list>

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

@@ -29,4 +29,8 @@
         <item name="android:textSize">20sp</item>
         <item name="android:fontFamily">sans-serif-medium</item>
     </style>
+
+    <style name="SplashTheme" parent="Theme.AppCompat.NoActionBar">
+        <item name="android:windowBackground">@drawable/splash_background</item>
+    </style>
 </resources>