Android 一种点赞动画的实现

最近有个需求，需要仿照公司的H5实现一个游戏助手，其中一个点赞的按钮有动画效果，如下图:

分析一下这个动画，点击按钮后，拇指首先有个缩放的效果，然后有5个拇指朝不同的方向移动，其中部分有放大的效果。

点击后的缩放效果

本文通过ScaleAnimation 实现缩放效果，代码如下：

<pre spellcheck="false" class="md-fences md-end-block ty-contain-cm modeLoaded" lang="" cid="n93" mdtype="fences" style="box-sizing: border-box; overflow: visible; font-family: var(--monospace); font-size: 0.9em; display: block; break-inside: avoid; text-align: left; white-space: normal; background-image: inherit; background-position: inherit; background-size: inherit; background-repeat: inherit; background-attachment: inherit; background-origin: inherit; background-clip: inherit; background-color: rgb(248, 248, 248); position: relative !important; border: 1px solid rgb(231, 234, 237); border-radius: 3px; padding: 8px 4px 6px; margin-bottom: 15px; margin-top: 15px; width: inherit; color: rgb(51, 51, 51); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;">private fun playThumbUpScaleAnimator() {
// x、y轴方向都从1倍放大到2倍，以控件的中心为原点进行缩放
ScaleAnimation(1f, 2f, 1f, 2f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f).run {
// 先取消控件当前的动画效果（重复点击时）
view.clearAnimation()
// 设置动画的持续时间
duration = 300
// 开始播放动画
view.startAnimation(this)
}
}
</pre>

拇指的散开效果

有5个拇指分别往不同的方向移动，本文通过动态添加View，并对View设置动画来实现。可以看到在移动的同时还有缩放的效果，所以需要同时播放几个动画。

本文通过ValueAnimator和AnimatorSet来实现该效果，代码如图：

<pre spellcheck="false" class="md-fences md-end-block ty-contain-cm modeLoaded" lang="" cid="n98" mdtype="fences" style="box-sizing: border-box; overflow: visible; font-family: var(--monospace); font-size: 0.9em; display: block; break-inside: avoid; text-align: left; white-space: normal; background-image: inherit; background-position: inherit; background-size: inherit; background-repeat: inherit; background-attachment: inherit; background-origin: inherit; background-clip: inherit; background-color: rgb(248, 248, 248); position: relative !important; border: 1px solid rgb(231, 234, 237); border-radius: 3px; padding: 8px 4px 6px; margin-bottom: 15px; margin-top: 15px; width: inherit; color: rgb(51, 51, 51); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;">// 此数组控制动画的效果
// 第一个参数控制X轴移动距离
// 第二个参数控制Y轴移动距离
// 第三个参数控制缩放的倍数（基于原大小）
val animatorConfig: ArrayList<ArrayList<Float>> = arrayListOf(
arrayListOf(-160f, 150f, 1f),
arrayListOf(80f, 130f, 1.1f),
arrayListOf(-120f, -170f, 1.3f),
arrayListOf(80f, -130f, 1f),
arrayListOf(-20f, -80f, 0.8f))

private fun playDiffusionAnimator() {
for (index in 0 until 5) {
binding.root.run {
if (this is ViewGroup) {
// 创建控件
val ivThumbUp = AppCompatImageView(context)
ivThumbUp.setImageResource(R.drawable.icon_thumb_up)
// 设置与原控件一样的大小
ivThumbUp.layoutParams = FrameLayout.LayoutParams(DensityUtil.dp2Px(25), DensityUtil.dp2Px(25))
// 先设置为全透明
ivThumbUp.alpha = 0f
addView(ivThumbUp)
// 设置与原控件一样的位置
ivThumbUp.x = binding.ivThumbUp.x
ivThumbUp.y = binding.ivThumbUp.y
AnimatorSet().apply {
// 设置动画集开始播放前的延迟
startDelay = 330L + index * 50L
// 设置动画监听
addListener(object : Animator.AnimatorListener {
override fun onAnimationStart(animation: Animator) {
// 开始播放时把控件设置为不透明
ivThumbUp.alpha = 1f
}

override fun onAnimationEnd(animation: Animator) {
// 播放结束后再次设置为透明，并从根布局中移除
ivThumbUp.alpha = 0f
ivThumbUp.clearAnimation()
ivThumbUp.post { removeView(ivThumbUp) }
}

override fun onAnimationCancel(animation: Animator) {}

override fun onAnimationRepeat(animation: Animator) {}
})
// 设置三个动画同时播放
playTogether(
// 缩放动画
ValueAnimator.ofFloat(1f, animatorConfig[index][2]).apply {
duration = 700
// 设置插值器，速度一开始快，快结束时减慢
interpolator = DecelerateInterpolator()
addUpdateListener { values ->
(values.animatedValue as Float).let { value ->
ivThumbUp.scaleX = value
ivThumbUp.scaleY = value
}
}
},
// X轴的移动动画
ValueAnimator.ofFloat(ivThumbUp.x, ivThumbUp.x + animatorConfig[index][0]).apply {
duration = 700
interpolator = DecelerateInterpolator()
addUpdateListener { values ->
ivThumbUp.x = values.animatedValue as Float
}
},
// Y轴的移动动画
ValueAnimator.ofFloat(ivThumbUp.y, ivThumbUp.y + animatorConfig[index][1]).apply {
duration = 700
interpolator = DecelerateInterpolator()
addUpdateListener { values ->
ivThumbUp.y = values.animatedValue as Float
}
})
}.start()
}
}
}
}
</pre>

示例

整合之后做了个示例Demo，完整代码如下：

<pre spellcheck="false" class="md-fences md-end-block ty-contain-cm modeLoaded" lang="" cid="n102" mdtype="fences" style="box-sizing: border-box; overflow: visible; font-family: var(--monospace); font-size: 0.9em; display: block; break-inside: avoid; text-align: left; white-space: normal; background-image: inherit; background-position: inherit; background-size: inherit; background-repeat: inherit; background-attachment: inherit; background-origin: inherit; background-clip: inherit; background-color: rgb(248, 248, 248); position: relative !important; border: 1px solid rgb(231, 234, 237); border-radius: 3px; padding: 8px 4px 6px; margin-bottom: 15px; margin-top: 15px; width: inherit; color: rgb(51, 51, 51); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;">class AnimatorSetExampleActivity : BaseGestureDetectorActivity() {

private lateinit var binding: LayoutAnimatorsetExampleActivityBinding

private val animatorConfig: ArrayList<java.util.ArrayList<Float>> = arrayListOf(
arrayListOf(-160f, 150f, 1f),
arrayListOf(80f, 130f, 1.1f),
arrayListOf(-120f, -170f, 1.3f),
arrayListOf(80f, -130f, 1f),
arrayListOf(-20f, -80f, 0.8f))

override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = DataBindingUtil.setContentView(this, R.layout.layout_animatorset_example_activity)
binding.ivThumbUp.setOnClickListener {
playThumbUpScaleAnimator()
playDiffusionAnimator()
}
}

private fun playThumbUpScaleAnimator() {
// x，y轴方向都从1倍放大到2倍，以控件的中心为原点进行缩放
ScaleAnimation(1f, 2f, 1f, 2f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f).run {
// 先取消控件当前的动画效果（重复点击时）
binding.ivThumbUp.clearAnimation()
// 设置动画的持续时间
duration = 300
// 开始播放动画
binding.ivThumbUp.startAnimation(this)
}
}

override fun onAnimationCancel(animation: Animator) {}

override fun onAnimationRepeat(animation: Animator) {}
})
// 设置三个动画同时播放
playTogether(
// 缩放动画
ValueAnimator.ofFloat(1f, animatorConfig[index][2]).apply {
duration = 700
// 设置插值器，速度一开始快，快结束时减缓
interpolator = DecelerateInterpolator()
addUpdateListener { values ->
(values.animatedValue as Float).let { value ->
ivThumbUp.scaleX = value
ivThumbUp.scaleY = value
}
}
},
// Y轴的移动动画
ValueAnimator.ofFloat(ivThumbUp.x, ivThumbUp.x + animatorConfig[index][0]).apply {
duration = 700
interpolator = DecelerateInterpolator()
addUpdateListener { values ->
ivThumbUp.x = values.animatedValue as Float
}
},
// X轴的移动动画
ValueAnimator.ofFloat(ivThumbUp.y, ivThumbUp.y + animatorConfig[index][1]).apply {
duration = 700
interpolator = DecelerateInterpolator()
addUpdateListener { values ->
ivThumbUp.y = values.animatedValue as Float
}
})
}.start()
}
}
}
}
}
</pre>

Android 一种点赞动画的实现