Tracking Touch Points on Screen for Mobile Devices

Does anyone have any good information for handling multiple points for any of the following situations? [Particularly for Android, unless it isn't any different from iOS ]

The above diagram basically explains what I am talking about. I usually refer to the reference and any available tutorials when it comes to t$$anonymous$$s learning somet$$anonymous$$ng new, but I haven't been able to find a tutorial for Android and I'm not to sure where to look for all the available functions/classes for Android. I managed to find t$$anonymous$$s in the reference, but I'm not to sure how to use it with multiple points.

• Slash across an object [Similar to the game Fruit Slice]
• Moving an object from point 1 to point 2 [Or like a toss effect]
• Zoom in/out screen pinch
• Drawing an ellipse and counting them.
• Drawing/tracing multiple points [In a particular order]

A code based implementation would be nice, I want to know the complexity of doing it from scratch before buying pre-existing packages.