大概半个月以前我们在APP里新增了原生广告（信息流广告），但是一开始展示率只有15%，后来考虑到或许是位置太靠下，于是向上移动了三个位置，但是没想到展示率降低到了1%以下，真的是非常奇怪。
前段时间写过一篇文章——为什么admob的广告展示次数远远低于请求次数（或填充次数）？但这并不能解答我现在的疑问，因为我们的信息流位置之前明显靠下，现在上移了，展示率不仅没有提高，反而降低到极点，真的很怪异。
这个时候只靠谷歌搜索是不好解决问题的，只能联系admob官方。
如何联系Admob官方？
很简单，在这个页面底部，选择最下面的“与我们联系”在工作日，admob的回复一般会在48小时之内，因为新冠肺炎疫情原因，回复时间可能会超过48小时，但一般72小时内会有回复。（当然需要翻墙才能打开）
在工单中我询问的是：
Hello, dear Admob tech, our native ads has very low show rate. The ad requests and fills are normal, as well as CTR and eCPM; only show rate is too low. Please help check.
Admob官方是怎么回复的？
Hello,
Thank you for reaching out. My name is Emma with the support team and I am very happy to assist you. I will try my best to provide as much information as possible, and if at any time I am unclear/not answering your question, please respond to let me know and I will clarify further.
I'm sorry to hear that you are facing this issue with your ads. Usually low show rate indicates that you might be requesting ads at the start of the user session, or very early within the app's code, so that most of the returned ads are not shown to the user. This is either because users did not reach the screen on which ads were to be shown or maybe that the ad response timed out. Because of this show rate is something you would need to understand and address from your end with your implementation.
Additionally, I've checked into your app and see that your match rate is actually quite consistent, so please rest assured that from AdMob side, your ad is working as intended and has a healthy performance. To address your show rate, you can self-check on the following points:
Double check the way you request ads. It can help to request Ads more closer to the screen on which ads are displayed
If you are pre-caching (or preloading) ads, that could be adjusted to improve the show rate
Review Ad Placements. If there are any ad units that are placed in screens less likely to be reached by users but the ad request is being sent in every user session (including ads placed in scroll lists), you can try other placements that can gain more impressions
I hope this information is helpful for you. If you have any additional questions regarding this issue, please free to reach out again and I would be more than happy to assist further.
Best,
Emma
简单翻译成中文：
您好，
多谢您与我们联络。我叫埃玛（Emma）在支持团队中，很高兴为您提供帮助。我会尽力提供尽可能多的信息，如果在任何时候我不清楚/不回答您的问题，请回复告知我，我会进一步澄清。
得知您的广告遇到此问题，我们深感抱歉。通常，较低的显示率表示您可能在用户会话开始时或在应用代码内很早就在请求广告，因此大部分返回的广告不会显示给用户。这是因为用户没有到达要在其上显示广告的屏幕，或者可能是广告响应超时。要知道，显示率是你方需要理解和解决的问题。
此外，我们检查了您的应用程序，发现您的匹配率实际上非常一致，因此请放心，从AdMob角度来看，您的广告可以按预期运行，并且效果良好。要解决您的显示率问题，您可以对以下几点进行自我检查：
- 仔细检查您请求广告的方式。它可以帮助请求更靠近广告展示屏幕的广告
- 如果您正在预缓存（或预加载）广告，则可以对其进行调整以提高展示率
- 查看广告展示位置。如果在屏幕上放置的广告单元不太可能被用户访问，但在每个用户会话中都发送了广告请求（包括滚动列表中放置的广告），则可以尝试其他可以获得更多展示次数的展示位置
- 希望这些信息对您有所帮助。如果您对此问题还有其他疑问，请随时与我们联系，我们非常乐意为您提供进一步的帮助。
最好的，
艾玛