tooot/android/app/src/main/java/com/xmflsct/app/tooot/MainActivity.java

package com.xmflsct.app.tooot;
import android.os.Bundle;

import com.facebook.react.ReactActivity;
import com.facebook.react.ReactActivityDelegate;
import com.facebook.react.ReactRootView;

import expo.modules.ReactActivityDelegateWrapper;

public class MainActivity extends ReactActivity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(null);
  }

  /**
  * Returns the name of the main component registered from JavaScript.
  * This is used to schedule rendering of the component.
  */
  @Override
  protected String getMainComponentName() {
    return "main";
  }

  /**
   * Returns the instance of the {@link ReactActivityDelegate}. There the RootView is created and
   * you can specify the rendered you wish to use (Fabric or the older renderer).
   */
  @Override
  protected ReactActivityDelegate createReactActivityDelegate() {
    return new ReactActivityDelegateWrapper(this, new MainActivityDelegate(this, getMainComponentName()));
  }
  public static class MainActivityDelegate extends ReactActivityDelegate {
    public MainActivityDelegate(ReactActivity activity, String mainComponentName) {
      super(activity, mainComponentName);
    }
    @Override
    protected ReactRootView createRootView() {
      ReactRootView reactRootView = new ReactRootView(getContext());
      // If you opted-in for the New Architecture, we enable the Fabric Renderer.
      reactRootView.setIsFabric(BuildConfig.IS_NEW_ARCHITECTURE_ENABLED);
      return reactRootView;
    }
  }
}