How to know in which pixels of a image user clicked?

Question

I want to draw a image filling the complete screen. Then when user clicks in any pixel or group of pixels they turn black. How can I know where the user clicked exactly and how can I turn the touched pixels black?

Answer 1

I'd probably draw a canvas over the image. Check out onTouchEvent and MotionEvent and have a look at this "paint" demo: http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/graphics/TouchPaint.html