Add MainApplication class to initialize React Native and CodePush integration

Author: hebertcisco

test/template/android/app/src/main/java/com/testcodepush/MainApplication.kt

@@ -0,0 +1,49 @@
+package com.testcodepush
+
+import android.app.Application
+import com.facebook.react.PackageList
+import com.facebook.react.ReactApplication
+import com.facebook.react.ReactHost
+import com.facebook.react.ReactNativeHost
+import com.facebook.react.ReactPackage
+import com.facebook.react.common.annotations.UnstableReactNativeAPI
+import com.facebook.react.defaults.DefaultNewArchitectureEntryPoint.load
+import com.facebook.react.defaults.DefaultReactHost.getDefaultReactHost
+import com.facebook.react.defaults.DefaultReactNativeHost
+import com.facebook.react.soloader.OpenSourceMergedSoMapping
+import com.facebook.soloader.SoLoader
+import com.microsoft.codepush.react.CodePush
+
+@OptIn(UnstableReactNativeAPI::class)
+class MainApplication : Application(), ReactApplication {
+
+    override val reactNativeHost: ReactNativeHost =
+      object : DefaultReactNativeHost(this) {
+        override fun getPackages(): List<ReactPackage> {
+          val packages = PackageList(this).packages
+          // Packages that cannot be autolinked yet can be added manually here, for example:
+          // packages.add(new MyReactNativePackage());
+          return packages
+        }
+
+        override fun getJSMainModuleName(): String = "index"
+        override fun getJSBundleFile(): String = CodePush.getJSBundleFile()
+
+        override fun getUseDeveloperSupport(): Boolean = BuildConfig.DEBUG
+
+        override val isNewArchEnabled: Boolean = BuildConfig.IS_NEW_ARCHITECTURE_ENABLED
+        override val isHermesEnabled: Boolean = BuildConfig.IS_HERMES_ENABLED
+      }
+
+  override val reactHost: ReactHost get() = getDefaultReactHost(this, reactNativeHost)
+
+  override fun onCreate() {
+    super.onCreate()
+    SoLoader.init(this, OpenSourceMergedSoMapping)
+    if (BuildConfig.IS_NEW_ARCHITECTURE_ENABLED) {
+      // If you opted-in for the New Architecture, we load the native entry point for this app.
+      load()
+    }
+  }
+
+}