I would suggest you to check testng file for STF -
https://github.com/tarun3kumar/seleniumtestsframework/blob/master/testng.xmlIt uses same tests to be executed on both ios and android emulator/device
The element locators are on java class file and not on properties file for test class referred in testng xml file. I would recommend to keep them in java classes and not on properties files :)
HTH
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