android - How to convert coordinates of the image view to the coordinates of the bitmap?

Question

In my app I need to let users to check the eyes at some photo. In OnTouchListener.onTouch(...) I get the coordinates of the ImageView.

How can I convert this coordinates to the point at the bitmap that was touched?

Answer 1

this works for me at least with API 10+: final float[] getPointerCoords(ImageView view, MotionEvent e) { final int index = e.getActionIndex(); final float[] coords = new float[] { e.getX(index), e.getY(index) }; Matrix matrix = new Matrix(); view.getImageMatrix().invert(matrix); matrix.postTranslate(view.getScrollX(), view.getScrollY()); matrix.mapPoints(coords); return coords; }