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Title: GitHub - Dong4Am/AndroidCustomView: 自定义View

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Description: 自定义View. Contribute to Dong4Am/AndroidCustomView development by creating an account on GitHub.

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https://patch-diff.githubusercontent.com/Dong4Am/AndroidCustomView#今天开始记录工作中遇到的需要实现的动画效果实现自定义view动画后期会有一些列动画设计思路的文章
https://camo.githubusercontent.com/0b28a9823eb16f555117b03378275a96e37ca1e35bc6d48e15ca36ccc66760d8/687474703a2f2f75706c6f61642d696d616765732e6a69616e7368752e696f2f75706c6f61645f696d616765732f323035373530312d643731306263613165313636666263342e6769663f696d6167654d6f6772322f6175746f2d6f7269656e742f7374726970
https://patch-diff.githubusercontent.com/Dong4Am/AndroidCustomView#其实我刚拿到设计图的时候心想md直接给一张gif图不就行了何必这个麻烦呐随后冷静下来之后其实就是抱怨之后想想作为一名android开发者总不能什么动画都依赖设计师吧那样的话会显得我们开发者没什么卵用啊说不定还会被设计师鄙视哦于是就开始了动画分析及实现之旅
https://patch-diff.githubusercontent.com/Dong4Am/AndroidCustomView#通过这个gif动画我们分析出动画过程的实质
https://patch-diff.githubusercontent.com/Dong4Am/AndroidCustomView#第一步我们要先画出一个圆角矩形吧
https://patch-diff.githubusercontent.com/Dong4Am/AndroidCustomView#圆角矩形绘制完成之后就是改变圆角半径的大小使其两边形成半圆的效果那么怎么才能让他成为半圆呐来看看一张图若要绘制成半圆效果那么这个圆的直径就是view自身的高度那么这个圆的半径就是height2
https://camo.githubusercontent.com/32243bae1b1e8e43e68452664a3f5ca27d8f20f8a02223cd6a82f89193234952/687474703a2f2f75706c6f61642d696d616765732e6a69616e7368752e696f2f75706c6f61645f696d616765732f323035373530312d373431646264666333616136633536382e706e673f696d6167654d6f6772322f6175746f2d6f7269656e742f7374726970253743696d61676556696577322f322f772f31323430
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https://patch-diff.githubusercontent.com/Dong4Am/AndroidCustomView#第二步当矩形两边都是半圆之后就要处理使其向中间靠拢逐渐形成一个圆那么问题又来了需要向中间移动多少呐并且怎么移动才能使两边都想中间聚拢呐
https://patch-diff.githubusercontent.com/Dong4Am/AndroidCustomView#下边来看一张图分析一下
https://camo.githubusercontent.com/9a0f32d508ceef01fe52c9fb4f644891766b6406ccf3104c7bcbbd2bd248798d/687474703a2f2f75706c6f61642d696d616765732e6a69616e7368752e696f2f75706c6f61645f696d616765732f323035373530312d346630646564316663313336616535362e706e673f696d6167654d6f6772322f6175746f2d6f7269656e742f7374726970253743696d61676556696577322f322f772f31323430
https://patch-diff.githubusercontent.com/Dong4Am/AndroidCustomView#有图可知移动的距离是width-height2然后在写一个动画让其改变距离最终两个半圆靠拢在一起形成圆
https://camo.githubusercontent.com/43bb2ba91f9acfd76023a9dd1f219dc2cfc5e9436168ba5fb0385dc4a674741a/687474703a2f2f75706c6f61642d696d616765732e6a69616e7368752e696f2f75706c6f61645f696d616765732f323035373530312d393137623632313165313162613762392e6769663f696d6167654d6f6772322f6175746f2d6f7269656e742f7374726970
https://patch-diff.githubusercontent.com/Dong4Am/AndroidCustomView#第三步让圆上移移动距离这个移动很好实现直接改变y轴方法的坐标就行了这个很简单就直接看代码吧
https://patch-diff.githubusercontent.com/Dong4Am/AndroidCustomView#第四步在圆中绘制一个对勾而且是带动画的对勾让对勾以动画的形式慢慢绘制出来
https://patch-diff.githubusercontent.com/Dong4Am/AndroidCustomView#我们先拿到对勾的path路径在对其改变偏移量加上dashpatheffect就能实现动态绘制对勾的效果了那么怎么计算对勾的起点折点和终点的坐标呐在网上找了一个不错的图片如果你的设计师直接把位置给你标明的很详细的话你就省了这些自己计算的麻烦
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https://patch-diff.githubusercontent.com/Dong4Am/AndroidCustomView#总结看到这里是不是觉得这样的动画实现起来也不是很复杂嘛也许你会觉得这样的动画没什么技术含量实现起来真的没什么难度何必再此大做文章呐其实我这里也只是个抛砖引玉的作用提供一种学习方法也许今天我们遇到的只是一个简单的动画可明天如果需要我们去做更复杂的动画呐我们该怎么处理怎么分析怎么实现呐只要我们把自己的需求分析拆解把复杂的步骤简单化分布实现在组合到一起就可以实现自己想要的效果你要知道炫酷的电影特效也是一帧一帧动画合成的哦
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