Expo: Facebook native ads not displaying image - expo

Question

After running test, the ad text display correctly, it displayed:
Your ad integration works. Whoohoo!
But no image displayed. I thought the <AdMediaView> show do the work, but it doesn't. What's wrong with my code?
App.js
import React from 'react';
import { StyleSheet, Text, View } from 'react-native';
import { FacebookAds } from 'expo';
FacebookAds.AdSettings.addTestDevice(FacebookAds.AdSettings.currentDeviceHash);
const adsManager = new FacebookAds.NativeAdsManager('my id', 1);
import AdComponent from './fbads.js';
export default class App extends React.Component {
render() {
return (
<View>
<Text>Hello!!</Text>
<View>
<AdComponent adsManager={adsManager} />
</View>
</View>
);
}
}
fbads.js
import React from 'react';
import { StyleSheet, Text, View } from 'react-native';
import { FacebookAds } from 'expo';
const { AdTriggerView, AdMediaView } = FacebookAds;
class AdComponent extends React.Component {
render() {
return (
<View>
<AdMediaView />
<AdTriggerView>
<Text>{this.props.nativeAd.bodyText}</Text>
</AdTriggerView>
</View>
);
}
}
export default FacebookAds.withNativeAd(AdComponent);

Answer 1

For anyone who still encounters this problem, try setting a fix width and height for the AdMediaView, and it should display after that. For example:
<AdMediaView style={{width: 400, height: 300}}/>
The same thing applies to AdIconView:
<AdIconView style={{width: 50, height: 50}}/>

Answer 2

OK, today I met this issue again. After a long time testing, I found that to show the image, I must place both AdIconView and AdMediaView.
This works:
<AdIconView style={{width: 50, height: 50}} />
<AdMediaView style={{width: 300, height: 200}} />
<AdTriggerView>
<Text>a{this.props.nativeAd.bodyText}</Text>
</AdTriggerView>
This doesn't work:
<AdMediaView style={{width: 300, height: 200}} />
<AdTriggerView>
<Text>a{this.props.nativeAd.bodyText}</Text>
</AdTriggerView>
Neither this:
<AdIconView style={{width: 50, height: 50}} />
<AdTriggerView>
<Text>a{this.props.nativeAd.bodyText}</Text>
</AdTriggerView>