Android Imports a third-party jar packet error How to properly import Jar pack _android

Import Zxing.jar package on Android, always error:

Could not find class ' Com.google.zxing.MultiFormatWriter ' and referenced from method Com.changyang.app.util.Encode2dUtil.creat2DCode

the solution was later found :

Prior to the release of Adt17, a Lib directory was created and add to Buiild path when importing the Third-party jar packages .

After the adt17 version, import the third party jar package, to establish a libs directory, cannot use the Lib name, ADT will automatically rely on the jar. No manual additions are necessary.