http://stackoverflow.com/questions/17054000/cannot-resolve-symbol-r-in-android-studio
"Tools" -> "Android" -> "Sync Project with Gradle Files"
就oK啦
http://stackoverflow.com/questions/17054000/cannot-resolve-symbol-r-in-android-studio
"Tools" -> "Android" -> "Sync Project with Gradle Files"
就oK啦