My Android Studio in activity_main.xml showing this problem: \"Rendering Problems No render target selected\" Help?
Top menu bar on the left side of the AVD Manager button you have a "Sync Project with Gradle Files" button. Click that. Android Studio may become sluggish for like 5 seconds, but you'll also see a loading wheel in the project files tab, and possibly a yellow bar on the top of activity_main.xml tab saying that Gradle is syncing. In about 5 seconds everything will be up to date, and you will see the device as expected. Hope this helps.