I'm having the same issues as Priyank.
I am using C#, for Android 4.4.2, and Appium v1.3.4, I can find the SeekBar web element, but cannot slide it. I have tried both:
seekBar.sendKeys([numbers ranging from 0 to 1])
and
Action dragDrop = new TouchAction();
dragDrop.DragAndDrop(seekBar.Location, new Location(){seekBar.Location.X + (seekBar.Size.Width / 2), seekBar.Location.Y + (seekBar.Size.Height / 2)});
dragDrop.Perform();
Neither method works. We do not want to use XPath as it is brittle so that's a no-go for us.
Please help, thanks!