So I\'m reading Android 6 for Programmers: An App-Driven Approach and the first two app examples I had no issues with the examples, this time the FlagQuiz example w
If this ()Unsupported method: BaseConfig.getApplicationIdSuffix Android Project is old and you have updated Android Studio, what I did was simply CLOSE PROJECT and ran it again. It solved the issue for me. Did not add any dependencies or whatever as described by other answers.