效果展示
Screen_recording_20240614_082748.gif
代码细节
主要逻辑在startAnim里，执行了几次动画效果，感兴趣的话需要研究下动画细节
class WebIndicator @JvmOverloads constructor(context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0) : FrameLayout(context, attrs, defStyleAttr) {
/**
* 进度条颜色
*/
@ColorInt
private var mColor = ResourcesCompat.getColor(resources, R.color.color_1aad19, null)
/**
* 进度条的画笔
*/
private val mPaint = Paint().apply {
isAntiAlias = true
color = mColor
isDither = true
strokeCap = Paint.Cap.SQUARE
}
/**
* 进度条动画
*/
private var mAnimator: Animator? = null
/**
* 控件的宽度
*/
private var mTargetWidth = 0
/**
* 当前匀速动画最大的时长
*/
private var mCurrentMaxUniformSpeedDuration = MAX_UNIFORM_SPEED_DURATION
/**
* 当前加速后减速动画最大时长
*/
private var mCurrentMaxDecelerateSpeedDuration = MAX_DECELERATE_SPEED_DURATION
/**
* 结束动画时长
*/
private var mCurrentDoEndAnimationDuration = DO_END_ANIMATION_DURATION
/**
* 当前进度条的状态
*/
private var indicatorStatus = 0
private var mCurrentProgress = 0f
/**
* 默认的高度
*/
var mWebIndicatorDefaultHeight: Int = 3
init {
val ta = context.obtainStyledAttributes(attrs, R.styleable.WebIndicator)
mColor = ta.getColor(R.styleable.WebIndicator_web_indicator_color, mColor)
mPaint.color = mColor
ta.recycle()
mTargetWidth = context.resources.displayMetrics.widthPixels
mWebIndicatorDefaultHeight = dp2px(3)
}
fun setColor(color: Int) {
this.mColor = color
mPaint.color = color
}
fun setColor(color: String?) {
this.setColor(Color.parseColor(color))
}
override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
val wMode = MeasureSpec.getMode(widthMeasureSpec)
var w = MeasureSpec.getSize(widthMeasureSpec)
val hMode = MeasureSpec.getMode(heightMeasureSpec)
var h = MeasureSpec.getSize(heightMeasureSpec)
if (wMode == MeasureSpec.AT_MOST) {
w = min(w.toDouble(), context.resources.displayMetrics.widthPixels.toDouble()).toInt()
}
if (hMode == MeasureSpec.AT_MOST) {
h = mWebIndicatorDefaultHeight
}
this.setMeasuredDimension(w, h)
}
override fun dispatchDraw(canvas: Canvas) {
canvas.drawRect(0f, 0f, mCurrentProgress / 100 * this.width, this.height.toFloat(), mPaint)
}
fun show() {
if (visibility == GONE) {
this.visibility = VISIBLE
mCurrentProgress = 0f
this.alpha = 1.0f
startAnim(false)
}
}
fun showForTest() {
this.visibility = VISIBLE
mCurrentProgress = 0f
this.alpha = 1.0f
startAnim(false)
}
override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
super.onSizeChanged(w, h, oldw, oldh)
this.mTargetWidth = measuredWidth
val screenWidth = context.resources.displayMetrics.widthPixels
if (mTargetWidth >= screenWidth) {
mCurrentMaxDecelerateSpeedDuration = MAX_DECELERATE_SPEED_DURATION
mCurrentMaxUniformSpeedDuration = MAX_UNIFORM_SPEED_DURATION
mCurrentDoEndAnimationDuration = MAX_DECELERATE_SPEED_DURATION
} else {
//取比值
val rate = (mTargetWidth / screenWidth).toFloat()
mCurrentMaxUniformSpeedDuration = (MAX_UNIFORM_SPEED_DURATION * rate).toInt()
mCurrentMaxDecelerateSpeedDuration = (MAX_DECELERATE_SPEED_DURATION * rate).toInt()
mCurrentDoEndAnimationDuration = (DO_END_ANIMATION_DURATION * rate).toInt()
}
}
fun setProgress(progress: Float) {
if (visibility == GONE) {
visibility = VISIBLE
}
if (progress < 95f) {
return
}
if (indicatorStatus != FINISH) {
startAnim(true)
}
}
fun hide() {
indicatorStatus = FINISH
}
private fun startAnim(isFinished: Boolean) {
val v = (if (isFinished) 100 else 95).toFloat()
if (mAnimator?.isStarted == true) {
mAnimator?.cancel()
}
mCurrentProgress = if (mCurrentProgress == 0f) 0.00000001f else mCurrentProgress
if (!isFinished) {
AnimatorSet().apply {
val p1 = v * 0.60f
val p2 = v
val animator0 = ValueAnimator.ofFloat(mCurrentProgress, p1)
val animator1 = ValueAnimator.ofFloat(p1, p2)
val residue = 1f - mCurrentProgress / 100 - 0.05f
val duration = (residue * mCurrentMaxUniformSpeedDuration).toLong()
//前半段40%+后半段60%
val duration4 = (duration * 0.4f).toLong()
val duration6 = (duration * 0.6f).toLong()
animator0.interpolator = LinearInterpolator()
animator0.setDuration(duration4)
animator0.addUpdateListener(mAnimatorUpdateListener)
animator1.interpolator = LinearInterpolator()
animator1.setDuration(duration6)
animator1.addUpdateListener(mAnimatorUpdateListener)
play(animator1).after(animator0)
start()
this@WebIndicator.mAnimator = this
}
} else {
var segment95Animator: ValueAnimator? = null
if (mCurrentProgress < 95f) {
segment95Animator = ValueAnimator.ofFloat(mCurrentProgress, 95f)
val residue = 1f - mCurrentProgress / 100f - 0.05f
segment95Animator.setDuration((residue * mCurrentMaxDecelerateSpeedDuration).toLong())
segment95Animator.interpolator = DecelerateInterpolator()
segment95Animator.addUpdateListener(mAnimatorUpdateListener)
}
val alphaAnimator = ObjectAnimator.ofFloat(this, "alpha", 1f, 0f)
alphaAnimator.setDuration(mCurrentDoEndAnimationDuration.toLong())
val valueAnimatorEnd = ValueAnimator.ofFloat(95f, 100f)
valueAnimatorEnd.setDuration(mCurrentDoEndAnimationDuration.toLong())
valueAnimatorEnd.addUpdateListener(mAnimatorUpdateListener)
var animatorSet = AnimatorSet()
animatorSet.playTogether(alphaAnimator, valueAnimatorEnd)
if (segment95Animator != null) {
val animatorSet0 = AnimatorSet()
animatorSet0.play(animatorSet).after(segment95Animator)
animatorSet = animatorSet0
}
animatorSet.addListener(mAnimatorListenerAdapter)
animatorSet.start()
mAnimator = animatorSet
}
indicatorStatus = STARTED
}
private val mAnimatorUpdateListener = AnimatorUpdateListener { animation ->
val t = animation.animatedValue as Float
this@WebIndicator.mCurrentProgress = t
this@WebIndicator.invalidate()
}
private val mAnimatorListenerAdapter: AnimatorListenerAdapter = object : AnimatorListenerAdapter() {
override fun onAnimationEnd(animation: Animator) {
doEnd()
}
}
override fun onDetachedFromWindow() {
super.onDetachedFromWindow()
/**
* animator cause leak , if not cancel;
*/
if (mAnimator?.isStarted == true) {
mAnimator?.cancel()
mAnimator = null
}
}
private fun doEnd() {
if (indicatorStatus == FINISH && mCurrentProgress == 100f) {
visibility = GONE
mCurrentProgress = 0f
//动画执行结束一定要将透明度还原，否则后面的draw操作看不到东西
this.alpha = 1f
}
indicatorStatus = UN_START
}
fun reset() {
mCurrentProgress = 0f
if (mAnimator?.isStarted == true) {
mAnimator?.cancel()
}
}
fun setProgress(newProgress: Int) {
setProgress(newProgress.toFloat())
}
fun dp2px(dip: Int): Int {
return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dip.toFloat(), context.resources.displayMetrics).toInt()
}
companion object {
/**
* 默认匀速动画最大的时长
*/
const val MAX_UNIFORM_SPEED_DURATION: Int = 8 * 1000
/**
* 默认加速后减速动画最大时长
*/
const val MAX_DECELERATE_SPEED_DURATION: Int = 450
/**
* 结束动画时长 ， Fade out 。
*/
const val DO_END_ANIMATION_DURATION: Int = 600
const val UN_START: Int = 0
const val STARTED: Int = 1
const val FINISH: Int = 2
}
}
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