Maximum Touch Points When Using Multi-Touch

Nathan Sokalski 4,116 Reputation points
2021-12-04T02:24:43.487+00:00

This is probably a very simple question (but I'm asking it & don't know the answer, so I guess I shouldn't say that), but I want to know what the maximum number of touch points the user's device can handle. For most scenarios, this will probably never be reached (most of us only have 10 fingers, and can we even fit them all on the screen at the same time anyway?), but it never hurts to be safe and it probably won't give the app a good name if it crashes when 3 little kids touch your screen! Is there some kind of system variable that has this information? Thanks.

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  1. Rob Caplan - MSFT 5,397 Reputation points Microsoft Employee
    2021-12-05T21:18:16.84+00:00

    You can use the Android PacakgeManager to ask Android if it supports touch and if so what kinds:
    PackageManager.GetSystemAvailableFeatures
    PackageManager.HasSystemFeature

    Relevant Features:

    PackageManager.FeatureTouchScreen - Touch is available
    PackageManager.FeatureTouchScreenMultiTouch - Two finger gestures
    PackageManager.FeatureTouchScreenMultiTouchDistinct - Two or more fingers independently
    PackageManager.FeatureTouchScreenJazzHand - 5 or more fingers independently

    Android doesn't provide a property for a more specific maximum, and I don't think it defines an overall max that devices can provide. I think most current Android phones support 10. Assume infinite are possible even if the app only tracks fewer - bounds check and discard values out of range rather than crashing.

    I used to have a 30 touch-point screen, and my colleagues and I surpassed that number with multiple people finger-painting at the same time. My painting app lost track of the extra touches, but it failed gracefully and didn't crash!


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