I have searched through Stack Overflow as I know this is a common question, but none of the solutions seemed to work for me. This included cleaning my project, deleting all imports and deleting the project and starting again entirely.
I am using the Eclipse specifically for android on mac (ADT bundle mac).
Whenever I create a new project I have errors immediatley in my src folder on the line setContentView(R.layout.activity_main);
and also on inflate.
Any suggestions other than those stated? It is literally before I have done any programming so cannot understand what is wrong.
EDIT: Fixed. Downloaded the SDK a second time and this seems to have fixed it.
Change your Project Build Target to the Latest
Right Click Project > Properties > Android > Change the Api to latest version
import The R class. The basic syntax is
import your_application_package_name.R;
If you have already imported it but it is not working then check if there in any error in your resource xmls. If so then r can be not generated and that error will be shown
Try to update the Android_SDK. When you create or import a new Android project the SDk builds the project. The R problem is mostly an update SDK problem.
来源：https://stackoverflow.com/questions/16900409/importing-r-android