[Zubersoft]

The only thing that can effectively eliminate accidental touches would be stylus mode, as McAroni mentioned. The gesture detection code provided by the Android framework does not have any built-in palm rejection, and there aren't even any examples that can be found online for doing that in an effective manner. I do have some code in place that ignores input when the surface area of the touch input exceeds a certain threshold. So that would ignore touch input from a palm if a large part of the palm was touching the screen. If only small parts of the palm touch the screen, that can't be differentiated from a finger, so the palm rejection will not work. If you can get a smart stylus for that device, that would make things much easier for you. 

As far as moving the piano staff, can you not just use the selection tool to draw a box around the entire piano staff, then use the nudge tool to move everything to the new location? 

Mike