code: package com.porcupinetestapp;
  
  import android.app.Application;
  import com.facebook.react.PackageList;
  import com.facebook.react.ReactApplication;
  import com.facebook.react.ReactNativeHost;
  import com.facebook.react.ReactPackage;
  import com.facebook.react.defaults.DefaultNewArchitectureEntryPoint;
  import com.facebook.react.defaults.DefaultReactNativeHost;
  import com.facebook.soloader.SoLoader;
  import java.util.List;
  
  public class MainApplication extends Application implements ReactApplication {
  
    private final ReactNativeHost mReactNativeHost =
        new DefaultReactNativeHost(this) {
          @Override
          public boolean getUseDeveloperSupport() {
            return BuildConfig.DEBUG;
          }
  
          @Override
          protected List<ReactPackage> getPackages() {
            @SuppressWarnings("UnnecessaryLocalVariable")
            List<ReactPackage> packages = new PackageList(this).getPackages();
            // Packages that cannot be autolinked yet can be added manually here, for example:
            // packages.add(new MyReactNativePackage());
            return packages;
          }
  
          @Override
          protected String getJSMainModuleName() {
            return "index";
          }
  
          @Override
          protected boolean isNewArchEnabled() {
            return BuildConfig.IS_NEW_ARCHITECTURE_ENABLED;
          }
  
          @Override
          protected Boolean isHermesEnabled() {
            return BuildConfig.IS_HERMES_ENABLED;
          }
        };
  
    @Override
    public ReactNativeHost getReactNativeHost() {
      return mReactNativeHost;
    }
  
    @Override
    public void onCreate() {
      super.onCreate();
      SoLoader.init(this, /* native exopackage */ false);
      if (BuildConfig.IS_NEW_ARCHITECTURE_ENABLED) {
        // If you opted-in for the New Architecture, we load the native entry point for this app.
        DefaultNewArchitectureEntryPoint.load();
      }
      ReactNativeFlipper.initializeFlipper(this, getReactNativeHost().getReactInstanceManager());
    }
  }
  