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Apache-2.0

💥Android爆炸破碎动画💥

这个破碎动画,是一种类似小米系统删除应用时的爆炸破碎效果的动画。

效果图展示

先来看下是怎样的动效,要是感觉不是理想的学习目标,就跳过,避免浪费大家的时间。🙂

ezgif-2-a640aae0e5.gif

源码在这里👉https://github.com/ReadyShowShow/explosion

解析在这里👉http://www.jianshu.com/p/11bed7dabe2c

一行代码即可调用该动画

new ExplosionField(this).explode(view, null))

下面开始我们酷炫的Android动画特效正式讲解👇


先来个整体结构的把握

整体结构非常简单明了,新老从业者都可快速看懂,容易把握学习。

./
|-- explosion
|   |-- MainActivity.java (测试爆炸破碎动效的主界面)
|   |-- animation(爆炸破碎动效有关的类均在这里)
|   |   |-- ExplosionAnimator.java(爆炸动画)
|   |   |-- ExplosionField.java(爆炸破碎动画所依赖的View)
|   |   `-- ParticleModel.java(每个破碎后的粒子的model,颜色、位置、大小等)
|   `-- utils
|       `-- UIUtils.java(计算状态栏高度的工具类)
`-- architecture.md

庖丁解牛

下面开始每个类的详细分析 本着从简到繁、由表及里的原则,详细讲解每个类

MainActivity.java

MainActivity.java是测试动效的界面,该Activity内部有7个测试按钮。该类做的事情非常单纯,就是给每个View分别绑定click点击事件,让View在点击时能触发爆炸破碎动画。

ParticleModel.java

ParticleModel.java是包含一个粒子的所有信息的model。advance方法根据值动画返回的进度计算出粒子的位置和颜色等信息

ExplosionAnimation.java

ExlosionAnimation.java是动画类,是一个值动画,在值动画每次产生一个值的时候,就计算出整个爆炸破碎动效内的全部粒子的状态。这些状态交由使用的View在渲染时进行显示。

ExplosionField.java

ExplosionField.java是真实执行上面ExplosionAnimator。ExplosionField会创建一个View并依附在Activity的根View上。

动画执行时为什么要创建一个新View(ExplosionField

其实上面的动画类ExplosionAnimator已经实现了核心功能,直接在原View上使用该动画应该是没问题的。为什么还要引入一个ExplosionField类呢?动画的执行为什么不能直接在原本的View上执行呢?偏偏要在一个看似多余的ExplosionField对象上执行呢。

这里就得从Android下View绘制原理来解释了:Android下的View都有一个Bound,在View进行measure和layout的时候,已经确定了View的大小和位置,如果要在这个View上进行动画的话,就会出现动画只能在view大小范围内进行展现。当然了,也不是说在原来View上一定不能实现这一动效,就是相当复杂,要在动画执行过程中,不断改变原View的大小和View的属性等信息,相当复杂。

在性能还行的前提下,要优先代码的整洁度,尽量避免为了优化的性能,而舍弃整洁清爽的代码。一般来说,过度的优化,并没有给用户带来太多体验上的提升,反而给项目带来了巨大的维护难度。

UIUtils.java

UIUtils是关于UI的工具类,没啥可说的

结束

源码在这里👉https://github.com/ReadyShowShow/explosion

如果有优化的建议与意见,欢迎大家提Issues或者邮箱ReadyShowShow@gmail.com

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