The images below shows an approach to implement ads in App Inventor.
Please note that I have actually consolidated 2 apps into 1 so that I can show everything in one place.
In reality, it should be broken down into 2 as follows:
1. App1 would be an admin app that is used for managing ad campaigns
2. App2 would be an app that gets published to Market
Using the admin app, once you make update to your ads, all users-devices that has your app installed, App2 the one that utilizes ads, will display the updated ads. See attached file. It shows what needs to be moved to Admin app.
More info can be found by going HERE
can we add another ad types from other ad networks(admob,inmobi)
Now that the App inventor is going to be put down, is there any advice you would give give us?
What should I use instead of it later?
App Inventor is going open source and will be handed over to MIT Center for Mobile Learning. There might be a gap between AI going down and being back up by MIT, but it won’t forever go down. For this, and legality issues, they have updated AI and provide functionality to download all your AI projects in one zip file.
Read the following two postings for more detail:
https://groups.google.com/forum/?hl=en#!topic/app-inventor-announcements/su5Xc-o3PUA
http://appinventorblog.com/