splash-screen-createReactActivityDelegate.java

// MainActivity.java

@Override
protected ReactActivityDelegate createReactActivityDelegate() {
  return new ReactActivityDelegate(this, getMainComponentName()) {
    @Override
    protected ReactRootView createRootView() {
      return new RNGestureHandlerEnabledRootView(MainActivity.this);
    }

    @Override
    protected void loadApp(String appKey) {
      if (mReactRootView != null) {
        throw new IllegalStateException("Cannot loadApp while app is already running.");
      }
      mReactRootView = createRootView();
      mReactRootView.startReactApplication(
          getReactNativeHost().getReactInstanceManager(),
          appKey,
          getLaunchOptions());
    }

    @Override
    protected void onDestroy() {
      if (mReactRootView != null) {
        mReactRootView.unmountReactApplication();
        mReactRootView = null;
      }
      if (getReactNativeHost().hasInstance()) {
        getReactNativeHost().getReactInstanceManager().onHostDestroy(getPlainActivity());
      }
    }
  };
}