问题
I'm using Android Studio v0.2.6 and I don't know why, but there is no R.java file created in my project. Therefore the autocomplete-thing tries to import android.R and everything is messed up. Is there any way to force AS to reset the project properties and try to recreate the R.java? Rebuilding doesn't work, I tried a lot that was suggested in other questions.
回答1:
I've had a similar issue - make sure your src, gen and libs folders are set as source folder in the Project Structure dialog. ( Open Project Structure -> Modules -> YourApp -> Sources. Ctrl click src and gen and click Sources above )
来源：https://stackoverflow.com/questions/18574792/androidstudio-doesnt-create-r-java