在一个9patch巴，有在其四边的黑边，但通常有区别左之间向右和向上到向下侧。为什么？这是如何差异的影响呢？

In a 9patch png, there are black edges in its four sides, but there is usually difference between the left to right, and the up to down side. Why? How does this difference impact?

推荐答案

一个简单的答的是

One of simplest ans is

根据采用九补丁工具的要求画黑线。

draw the black line according to your requirement using nine patch tools.

您可以找到有关如何9修补工作这里

You can find more information about how nine patch works here