Program is not wrong, but it is not up and running,
总是提示： “Your project contains error(s)，please fix them before running your application”
There are several reasons:
1. developed under different computers and different file storage path, the main reason for the error is contained tripartite library package ".classpath" path to the file error.
2. may also be your SDK version does not exist or is not.
3. Compile the class, apk file in question: Do what you can to clear. → Clean Project → Clena the Projects selected the Selected Below you wrong project on it.
Summary: Android application development is pay attention to what the details would not be these problems.
Reproduced in: https: //my.oschina.net/tiwer/blog/199849