Error prompts for new Android project in Eclipse

A new Android project in Eclipse shows a hint that r cannot be resolved to a variable Android. As you can see from the prompts, the R.java resource file is not generated, but the specifics of how to modify it are not prompted. Seeing the same problem in StackOverflow, the answer to the question is given a solution.

The solution is to select Java build Path in the sidebar of the project->properties and then hook up the corresponding version of the Android SDK check box. The problem should be brought about by eclipse itself, and there should be a more natural solution.

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