Add a jar file for Android

Add system jar and third-party jar files

1. for common application development that requires the use of framework resources, you need to set/home/lsj/Android/full_src/out/target/product /... the framework under/system/framework. jar and service. add jar to the Lib folder of the project, select the added JAR file, right-click build path ", and add to path to add jar to the project.

2. Sometimes some framework resources are required. You only need to add the class. Jar generated by out compilation to the user_lib of the project and top it down.