Android JNI cannot find the class

If a problem occurs in the afternoon, JNI cannot find the class. The solution is as follows:

1. System variable settings:
(1) My computer-properties-advanced-Environment Variables
Add the system variable java_home: D: \ Program Files \ Java \ jdk1.7.0 _ 01 (the path after Java is installed ),
Add % java_home %/bin to the PATH variable,
Add the system variable classpath :.; d: \ Program Files \ Android-SDK \ platforms \ Android-8 \ Android (1st: Android folder path, special note: Add ".; ", otherwise it will still fail)

2. Build the project in eclipse. Of course, it is best to avoid errors. In the CMD window, enter the classes directory of the project and run: javah-JNI package name. Class Name