@[TOC]
- 仿“某音”APP 多头像跳动动画+轮播动画+心跳动画+输入框抖动动画 实现逻辑比较简单，主要是细微之处调整比较费时间，有需要的童鞋可以拿去用。
/**
* 启动宠物多头像跳动动画
*/
private fun startPetHeadJumpAnim(animSet: ArrayList<ObjectAnimator>, imageViews: ArrayList<ImageView>, handler: Handler) {
for (i in imageViews.lastIndex downTo 0) {
val anim = ObjectAnimator.ofFloat(imageViews[i], "translationY", 0f, -30f, 0f)
animSet.add(anim)
anim.duration = 600
when (i) {
imageViews.lastIndex - 1 -> {
anim.startDelay = 200
}
imageViews.lastIndex - 2 -> {
anim.startDelay = 400
}
}
if (i == imageViews.lastIndex) {
anim.addListener(object : Animator.AnimatorListener {
override fun onAnimationRepeat(animation: Animator?) {}
override fun onAnimationEnd(animation: Animator?) {
handler.postDelayed({
for (an in animSet) {
an.start()
}
}, 2000)
}
override fun onAnimationCancel(animation: Animator?) {}
override fun onAnimationStart(animation: Animator?) {}
})
}
anim.start()
}
} /**
* 启动宠物多头像位移动画
*/
private fun startPetHeadAlphaAnim(animSet: ArrayList<ObjectAnimator>, imageViews: ArrayList<ImageView>, handler: Handler) {
var startX = 0f
var endX = 0f
for ((i, v) in (imageViews.lastIndex downTo 0).withIndex()) {
// 第4个以后,把（显示的）第一个隐藏，后两个向前移动
if (i > 2) {
for (j in v + 3 downTo v + 1) {
val anim = when (j) {
v + 3 -> {
startX = animPetPositionLeft//-150f
endX = animPetPositionEnd//-180f
val xA = PropertyValuesHolder.ofFloat("translationX", startX, endX)
val alphaA = PropertyValuesHolder.ofFloat("alpha", 1f, 0f)
ObjectAnimator.ofPropertyValuesHolder(imageViews[j], xA, alphaA)
}
v + 2 -> {
startX = animPetPositionMiddle//-80f
endX = animPetPositionLeft//-150f
ObjectAnimator.ofFloat(imageViews[j], "translationX", startX, endX)
}
v + 1 -> {
startX = animPetPositionRight//-10f
endX = animPetPositionMiddle//-80f
ObjectAnimator.ofFloat(imageViews[j], "translationX", startX, endX)
}
else -> null
}
if (anim != null) {
animSet.add(anim)
anim.duration = 900
anim.startDelay = i * 600L
anim.start()
}
}
}
// 依次显示View
when (i) {
0 -> {
startX = animPetPositionMiddle//-80f
endX = animPetPositionLeft//-150f
}
1 -> {
startX = animPetPositionRight//-10f
endX = animPetPositionMiddle//-80f
}
in 2..imageViews.lastIndex -> {
startX = 0f
endX = animPetPositionRight//-10f
}
}
val xA = PropertyValuesHolder.ofFloat("translationX", startX, endX)
val alphaA = PropertyValuesHolder.ofFloat("alpha", 0f, 1f)
val anim = ObjectAnimator.ofPropertyValuesHolder(imageViews[v], xA, alphaA)
animSet.add(anim)
anim.duration = 900//300
anim.startDelay = i * 600L// 200
anim.start()
if (v == 0) {
anim.addListener(object : Animator.AnimatorListener {
override fun onAnimationRepeat(animation: Animator?) {}
override fun onAnimationEnd(animation: Animator?) {
handler.postDelayed({
for (view in imageViews) {
view.alpha = 0f
}
for (an in animSet) {
an.start()
}
}, 2000)
}
override fun onAnimationCancel(animation: Animator?) {}
override fun onAnimationStart(animation: Animator?) {}
})
}
}
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_head_anim)
// 三个头像
val image3 = arrayListOf<Int>()
image3.add(R.drawable.pic_1)
image3.add(R.drawable.pic_2)
image3.add(R.drawable.pic_3)
val animSet3 = arrayListOf<ObjectAnimator>()
val handler3 = Handler()
initAnim(this, rlHead3, image3, animSet3, handler3)
// 五个头像
val image5 = arrayListOf<Int>()
image5.addAll(image3)
image5.add(R.drawable.pic_4)
image5.add(R.drawable.pic_5)
val animSet5 = arrayListOf<ObjectAnimator>()
val handler5 = Handler()
initAnim(this, rlHead5, image5, animSet5, handler5)
}
/**
* 初始化动画
*/
private fun initAnim(
context: Context,
layout: RelativeLayout,
images: ArrayList<Int>,
animSet: ArrayList<ObjectAnimator>,
handler: Handler
) {
layout.removeAllViews()
animSet.clear()
val ivList = arrayListOf<ImageView>()
val isJumpAnim = images.size <= 3
for (i in images.lastIndex downTo 0) {
val iv = CircleImageView(context)
val width = ConvertUtils.dp2px(30f)
val lp = RelativeLayout.LayoutParams(width, width)
// 是否为跳动 动画
if (isJumpAnim) {
iv.alpha = 1f
when (i) {
0 -> iv.translationX = AnimatorUtil.animPetPositionLeft//-150f
1 -> iv.translationX = AnimatorUtil.animPetPositionMiddle//-80f
2 -> iv.translationX = AnimatorUtil.animPetPositionRight//-10f
}
} else {
iv.alpha = 0f
}
iv.layoutParams = lp
iv.scaleType = ImageView.ScaleType.CENTER_CROP
iv.borderColor = ContextCompat.getColor(context, R.color.colorPrimaryDark)
iv.borderWidth = ConvertUtils.dp2px(1f)
iv.setImageResource(images[i])
layout.addView(iv)
ivList.add(iv)
}
AnimatorUtil.startPetHeadAnim(animSet, ivList, handler)
}如果动画用于RecycleView 列表，适配item复用机制，可以在Adapter中增加以下代码，通过handler和animSet控制动画的开启和取消。
override fun onViewAttachedToWindow(holder: MyViewHolder) {
super.onViewAttachedToWindow(holder)
for (anim in holder.animSet) {
anim.start()// 启动动画
}
}
override fun onViewDetachedFromWindow(holder: MyViewHolder) {
clearAnimSet(holder)
}
override fun onViewRecycled(holder: MyViewHolder) {
// 清除动画
clearAnimSet(holder)
super.onViewRecycled(holder)
}
/**
* 清空动画集
*/
private fun clearAnimSet(holder: MyViewHolder) {
holder.handler.removeCallbacksAndMessages(null)
for (anim in holder.animSet) {
anim.pause()
}
}
/**
* 启动放大的心跳动画
*/
fun startEnlargeHeart(imageView: ImageView) {
val anim = imageView.animate()
anim.scaleX(2.0f).scaleY(2.0f).setInterpolator(AccelerateInterpolator()).setDuration(200)
.setListener(object : Animator.AnimatorListener {
var tag = true
override fun onAnimationRepeat(animation: Animator?) {}
override fun onAnimationEnd(animation: Animator?) {
if (tag) {
anim.scaleX(1.0f).scaleY(1.0f).setInterpolator(DecelerateInterpolator()).setDuration(400).startDelay = 0
} else {
anim.scaleX(2.0f).scaleY(2.0f).setInterpolator(AccelerateInterpolator()).setDuration(400).startDelay = 2000
}
tag = !tag
}
override fun onAnimationCancel(animation: Animator?) {}
override fun onAnimationStart(animation: Animator?) {}
}).startDelay = 1000
}
/**
* 启动抖动提示动画（如 EditText为空时 抖动效果）
*/
fun startErrorAnim(view: View){
view.startAnimation(AnimationUtils.loadAnimation(App.instance, R.anim.shake_anim))
}shake_anim.xml
<?xml version="1.0" encoding="utf-8"?>
<translate xmlns:android="http://schemas.android.com/apk/res/android"
android:fromXDelta="0"
android:toXDelta="10"
android:duration="300"
android:interpolator="@anim/cycles_anim" />cycles_anim.xml
<?xml version="1.0" encoding="utf-8"?>
<cycleInterpolator xmlns:android="http://schemas.android.com/apk/res/android"
android:cycles="2" />