android - 像如图的笔触效果是怎么做到的？

Question

首先请看一下图片，这个应用能够在绘制时画出如图所示那么多东西。 我想知道这个应用用的是Canvas里的什么API？

Answer 1

Canvas is used, but obviously it is not only possible with some APIs of Canvas. Capturing screen touch events, asymptotic line coloring, and more importantly, various algorithms and matrix data processing cannot be summarized and described clearly in one or two sentences. You can start by searching Google for "Android calligraphy".