android在屏幕上发现压力

Question

I would like to roughly understand the amount of pressure the finger presses on the capacitive screen on android. My idea is to get the area covered by the finger when it is touched (maybe some extra parameters to get it more accurate, but thats the main idea).

So, is there any way to find the are covered? (for example get the number of pixels covered).

Answer 1

There is only MotionEvent.getPressure() (which you probably already found). I doubt that there is something that reports how many pixel are covered by the finger.

Answer 2

I do not really know but you have access to the following function :

MotionEvent e;
float press = e.getPressure(...);

press will be between 0 and 1, from 0 = no pressure, to 1 = normal pressure, however it can be more then 1...

Your thing is totally NIH... Use something that already exist ? Or maybe it doesn't cover your needs !

Answer 3

You can use MotionEvent.getSize() to get the normalized value (from 0 to 1) of the area of screen being pressed. This value is correlated with the number of pixels pressed.