Problems with Android R.java file not found

Solution: Clean does not automatically generate R.java files, it is possible that the Res-->layout directory of XML files have errors, to resolve these errors can be automatically generated R.java files.

Possible causes of the error:

The 1.Android SDK was updated, and ADT was not updated, resulting in the inability to load the high-level layout file;

2. The layout control used by the project is higher than the compiled version and can be configured under the Project.Properties file;

3. The project uses a third-party or custom layout file without introducing the appropriate package or layout file, resulting in the custom layout not being found;

Problems with Android R.java file not found