title: Admob React Native google mobile ads (RewardedAd) showing white screen before loading the ads
body: <p>What is wrong on this below code?</p>
  <p>The ads are appearing when I change the screen but before loading the Ads I am getting white screen for 2-3 seconds.</p>
  <p>Why it's happening? Thank you in advance for your time and support.</p>
  <pre><code>import React, { useState, useEffect } from &quot;react&quot;;
  import { View, Button, Text, ScrollView, } from 'react-native'
  import { RewardedAd, RewardedAdEventType, TestIds } from 'react-native-google-mobile-ads';
  
  const adUnitId = __DEV__ ? TestIds.REWARDED : 'ca-app-pub-3940256099942544/5224354917';
  
      const rewarded = RewardedAd.createForAdRequest(adUnitId, {
        requestNonPersonalizedAdsOnly: true,
        keywords: ['fashion', 'clothing'],
      });
      const Testing = ({ navigation }) =&gt;{
              const [loaded, setLoaded] = useState(false);
          useEffect(() =&gt; {
                const unsubscribeLoaded = rewarded.addAdEventListener(RewardedAdEventType.LOADED, () =&gt; {
                  setLoaded(true);
                  rewarded.show();
                });
                const unsubscribeEarned = rewarded.addAdEventListener(
                  RewardedAdEventType.EARNED_REWARD,
                  reward =&gt; {
                    console.log('User earned reward of ', reward);
                  },
                );
            // Start loading the rewarded ad straight away
                rewarded.load();
            // Unsubscribe from events on unmount
                return () =&gt; {
                  unsubscribeLoaded();
                  unsubscribeEarned();
                };
              }, []);
            
              // No advert ready to show yet
              if (!loaded) {
                return null;
              }
              return (
                  &lt;ScrollView&gt;
                  &lt;View style={{flex:1, justifyContent : 'center',alignItems : 'center'}}&gt;
                  &lt;Text&gt; 
                  Lorem Ipsum is simply dummy text of the printing and typesetting industry.
                  Lorem Ipsum has been the industry's standard dummy text ever since the 1500s,
                   &lt;/Text&gt;
                  &lt;Button onPress = {() =&gt; navigation.navigate('ThirdPage')} title='Next Screen'&gt;&lt;/Button&gt;
                     &lt;/View&gt;
                  &lt;/ScrollView&gt;)
              }
              export default Testing
  </code></pre>