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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?
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