Similar confusion here. In the section "Project Structure"> "Modules"> "Sources" I had to add "Content Root", in my case - the directory "/ opt / android-sdk-linux / sources / android-19". Then mark the subdirectory "android" as the blue source folder.
Yes, like you, my project structure showed the correct entry in the "Platform Settings"> "SDK"> "Android API"> "Source Path" section, but this is clearly not enough for intellij to resolve all Android SDK characters.
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