After eclipse imports apidemos, R. Java is not automatically generated.

After importing apidemos, the res folder displays an error. The SRC folder also displays an error. Open the SRC folder and check the error items. The R. Java file does not exist. Hundreds of times, found a lot, the title is the same, want to come to the content is similar, read one, said in string. add a right slash to the front of some lines in XML. After reading this file, we found that this right slash was already present.

Later I thought that when I created my own project, the android api I selected was 1.1. So I changed android to 2.2 in project-> properties, and applied it. After a while, OK, R. the Java file appears.

I don't know if other people's situations are different. My problem is solved in this way.