How to preserve Appium session between multiple testng class

Question

I am automating Android application using Appium, I have One Base Class with Setup and Tear down (In setup initialization appium session and in teardown destroying session )

Answer 1

You can achieve the same without inheriting base class.

Step1 -> Initialize driver object in your set up i.e your setup method as driver=new AndroidDriver(url,caps);

Step 2-> If you have any Utility or Constant class, call its constructor and pass driver as a parameter e.g. new Constants(driver);
Note: You can mark driver as a static variable if you only need one driver instance.

Step 3-> Whenever you wish to access driver, access it as Constant.driver or initialize driver object at class level.