MainApplication.kt

package com.package.example

import com.facebook.soloader.SoLoader;
import android.app.Application
import android.content.res.Configuration

import com.facebook.react.PackageList
import com.facebook.react.ReactApplication
import com.facebook.react.ReactNativeHost
import com.facebook.react.ReactPackage
import com.facebook.react.ReactHost
import com.facebook.react.defaults.DefaultNewArchitectureEntryPoint.load
import com.facebook.react.defaults.DefaultReactHost.getDefaultReactHost
import com.facebook.react.defaults.DefaultReactNativeHost

import expo.modules.ApplicationLifecycleDispatcher
import expo.modules.ReactNativeHostWrapper
import com.package.example.BuildConfig

class MainApplication : Application(), ReactApplication {

  override val reactNativeHost: ReactNativeHost = ReactNativeHostWrapper(
        this,
        object : DefaultReactNativeHost(this) {
          override fun getPackages(): List<ReactPackage> {
            // Packages that cannot be autolinked yet can be added manually here, for example:
            // packages.add(new MyReactNativePackage());
            return PackageList(this).packages
          }

          override fun getJSMainModuleName(): String = ".expo/.virtual-metro-entry"

          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.applicationContext, reactNativeHost)

  override fun onCreate() {
    super.onCreate()
    SoLoader.init(this, false)
    if (BuildConfig.IS_NEW_ARCHITECTURE_ENABLED) {
      // If you opted-in for the New Architecture, we load the native entry point for this app.
      load()
    }
    ApplicationLifecycleDispatcher.onApplicationCreate(this)
  }

  override fun onConfigurationChanged(newConfig: Configuration) {
    super.onConfigurationChanged(newConfig)
    ApplicationLifecycleDispatcher.onConfigurationChanged(this, newConfig)
  }
}