如何从ArrayList获取Point值

Question

I have a small problem that I hope is easy to solve. In the code below on the second row I have path1.moveTo... but instead of using the touchDownX1 and touchDownY1 coordinates, I thought it would be better to use the first values of X and Y from the touchPoints[0] , but I don't know how?

// Path 1
path1.moveTo(touchDownX1, touchDownY1);
for(Point point: touchPoints[0]) {
path1.lineTo(point.x, point.y);
canvas.drawPath(path1, paint1);
}

Answer 1

You have to write touchPoints.get(0) because the [index] notation only works for arrays, not ArrayLists.

Edit: The rest of the code should work. The way you access x and y is perfectly fine, assuming that the first element touchPoints is a list of points . If the first element of touchPoints is a single point, do not use a loop, just do touchPoints.get(0).x and the same for y.

Edit: The moveTo method should only be called for the beginning of a contour/shape to set its starting point. There is no reason to call it more than that for a single contour.