monkeyrunner drag problem

            
Recently made by an automatic testing tool used in the monkeyrunner, experiencing a headache problem, anguish days.
To test the app interface issues in a listview, listview need to simulate the effect of the slide, use the device.drag ((x1, y1), (x2, y2), during, step) method, but not always reach and manual slide effects (such as hand sliding listview, after stopping the slide to 15-20 video, but may be simulated slide to 12-17 videos), there are deviations.
Personal feeling and the latter two parameters, during & step, but do not know how to get these two parameters? Please gurus advice, thank you
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I also encountered the same problem