Android custom view to achieve ring alternating effect

Let's look at the renderings first:

It doesn't look very dazzling, and its implementation is not very complex. The focus is on the drawing of OnDraw () method.

The first is our attrs file:

Next, we override the custom view class of the view class:

Finally, our layout file:

summary

Well, even if our effect is completed here, interested friends can write and see. Personally, I feel that custom view needs a lot of practice to be used by me. I hope this article can help you develop Android.