1. 确认是否已经安装好最新的react-native-admob和react-native-google-signin库。

2. 在APP.js中添加以下代码：

import { InterstitialAd, AdEventType, TestIds } from '@react-native-firebase/admob';
import { useCallback } from 'react';

const adUnitId = __DEV__ ? TestIds.INTERSTITIAL : 'ca-app-pub-xxxxxxxxxxxxxxxx/xxxxxxxxxx'; //在此替换你自己的广告ID

const App = () => {
  const interstitial = InterstitialAd.createForAdRequest(adUnitId, {
    requestNonPersonalizedAdsOnly: true,
    keywords: ['games', 'sports', 'news'],
  });

  const onAdEvent = useCallback((type, error) => {
    if (type === AdEventType.LOADED) {
      interstitial.show();
    }
    console.log('InterstitialAd event:', type, error);
  }, [interstitial]);

  return (
    
       interstitial.load().then(() => Promise.resolve())}>
        Load interstitial
      

       promisify(interstitial.showModal)()}>
        Show as modal
      

       interstitial.show()}>
        Show
      

      
    
  );
};

3. 请检查您的Admob帐户并确保您的广告单位ID正确无误。您还可以选择使用测试ID以广告不可用的情况下测试广告。

4. 请注意，在实际发布应用程序之前，请确保取代广告ID和默认测试ID为自己的ID，此代码仅供参考。