안드로이드 View Animation 연달아 호출하기

View에 대한 하나의 애니메이션이 끝나고 다음 애니메이션, 그 다음 애니메이션.. 몇개를 연달아 호출하는 요구사항이 있었다.

공식 안드로이드 라이브러리를 찾다보니.. Listener를 각각 다는 방법 말고는 없는것 같아서 편의성 클래스를 하나 만들었다.

(못찾은 걸수도..)

 

https://gist.github.com/WoochanLee/934893722316a120f9955e4fd637dc4a

Android Animation Chain

 

AnimationChain.kt

	/**
	* Created by WoochanLee on 2022. 05. 23
	* https://gist.github.com/WoochanLee/934893722316a120f9955e4fd637dc4a
	*/
	class AnimationChain private constructor(builder: Builder) {
	private val animation: Animation = builder.firstAnimation
	private val targetView: View = builder.targetView
	fun startAnimation() {
	targetView.startAnimation(animation)
	}
	class Builder {
	private val _animationList: MutableList<Animation> = mutableListOf()
	private var _targetView: View? = null
	val firstAnimation: Animation
	get() {
	if (_animationList.isEmpty()) {
	throw IllegalStateException("You need to add at least one animation")
	}
	return _animationList.first()
	}
	val targetView: View
	get() {
	return _targetView ?: throw IllegalStateException("You need to call setView(View) first")
	}
	fun targetView(view: View): Builder {
	_targetView = view
	return this
	}
	fun addAnimation(nextAnimation: Animation): Builder {
	if (_animationList.isEmpty()) {
	_animationList.add(nextAnimation)
	return this
	}
	_animationList.last()
	.setAnimationListener(object : Animation.AnimationListener {
	override fun onAnimationStart(animation: Animation?) = Unit
	override fun onAnimationRepeat(animation: Animation?) = Unit
	override fun onAnimationEnd(animation: Animation?) {
	_targetView?.startAnimation(nextAnimation)
	}
	})
	_animationList.add(nextAnimation)
	return this
	}
	fun build(): AnimationChain {
	if (_targetView == null) {
	throw IllegalStateException("You need to call setView(View) first")
	}
	if (_animationList.isEmpty()) {
	throw IllegalStateException("You need to add at least one animation")
	}
	return AnimationChain(this)
	}
	}
	}

view raw AnimationChain.kt hosted with ❤ by GitHub

사용 방법

val animationChain = AnimationChain.Builder()
    .targetView(testView)
    .addAnimation(AnimationUtils.loadAnimation(this, R.anim.test_1))
    .addAnimation(AnimationUtils.loadAnimation(this, R.anim.test_2))
    .addAnimation(AnimationUtils.loadAnimation(this, R.anim.test_3))
    .build()

animationChain.startAnimation()

 

찾아헤맨 시간보다 코드짜는 시간이 짧았다는건 함정..