A Mobile Application Testing Community
Most of the mobile app testing services use Appium for mobile app automation.
For scroll down/up Appium provides two built in functions:
1.driver.scrollTo("R") :It scroll forward to the element which has a description or name which contains the input text. Scrolling is performed on the first scrollView present on the UI.
2.driver.ScrollToExact("Top"): This method also perform scroll method but it will search only for exact text for scrolling.