前言
上一篇Path特效功臣----PathMesure我们讲了PathMesure中api的详细方法和测试。本文就用我们学到的PathMeasure实现一个动态效果的SearchView，先瞄一下好不好看
searchView图片来源于网上
思路(由简到繁)
绘制静态的路径（放大镜和外圆）
1、onSizeChang()中得到组件大小
2、填充Path的放大镜和外圆
为静态图添加动态效果
1、采用ValueAnimtor提供实时变量
2、采用PathMeasure根据实时变量去绘制
3、动态效果分为四种状态（初始化，放大镜动画，外圆动画，结束动画）
绘制静态的路径
绘制的路径全部由Path去填充，放大镜可以拆分为一个圆和一条斜线，需要注意的是这里addArc的起始角度和终点角度
红色为Path的起点45度
class MySearchView(context: Context?, attrs: AttributeSet?) : View(context, attrs) {
constructor(context: Context?) : this(context, null)
private val mPaint = Paint()//画笔
private var offestFactoty = 0.9f //偏移因子画布是组件的0.9
private var mWidth: Float = 0.0f //组件宽度
private var mHeight: Float = 0.0f //组件高度
private lateinit var searchRecf: RectF
private lateinit var cicleRecf: RectF
private val searchPath: Path = Path() //放大镜的path
private val ciclePath: Path = Path() //外圆的path
init {
initPaint()
}
private fun initPaint() {
mPaint.color = Color.BLUE
mPaint.isAntiAlias = true
mPaint.style = Paint.Style.STROKE
mPaint.strokeCap = Paint.Cap.ROUND
mPaint.strokeWidth = 8f
}
//1、onSizeChang()中得到组件大小
override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
super.onSizeChanged(w, h, oldw, oldh)
mWidth = w.toFloat()
mHeight = h.toFloat()
initPath()
}
//2、填充Path的放大镜和外圆
private fun initPath() {
cicleRecf = RectF(-mWidth / 2 * offestFactoty, -mHeight / 2 * offestFactoty, mWidth / 2 * offestFactoty, mHeight / 2 * offestFactoty)
searchRecf = RectF(-mWidth / 5, -mHeight / 5, mWidth / 5, mHeight / 5)
searchPath.addArc(searchRecf, 45f, 359.9f) //填充内圆
ciclePath.addArc(cicleRecf, 45f, 359.9f) //填充外圆
val pathMeasure = PathMeasure(ciclePath, false)
val floatArray = FloatArray(2)
val posTan = pathMeasure.getPosTan(0f, floatArray, null)//拿到手柄的终点
searchPath.lineTo(floatArray[0], floatArray[1])//为内圆添加手柄路径形成放大镜
}
override fun onDraw(canvas: Canvas?) {
canvas?.translate(mWidth / 2, mHeight / 2)//移动坐标到组件中心
canvas?.drawPath(searchPath, mPaint)
canvas?.drawPath(ciclePath,mPaint)
}
}
静态图
为静态图添加动态效果
package com.hzb.myutils.view
import android.animation.Animator
import android.animation.ValueAnimator
import android.content.Context
import android.graphics.*
import android.util.AttributeSet
import android.view.View
import android.view.animation.LinearInterpolator
import com.hzb.utilsbox.utils.LogUtil
class MySearchView(context: Context?, attrs: AttributeSet?) : View(context, attrs) {
constructor(context: Context?) : this(context, null)
private val mPaint = Paint()//画笔
private var offestFactoty = 0.9f //偏移因子画布是组件的0.9
private var mWidth: Float = 0.0f //组件宽度
private var mHeight: Float = 0.0f //组件高度
private lateinit var searchRecf: RectF
private lateinit var cicleRecf: RectF
private val searchPath: Path = Path() //放大镜的path
private val ciclePath: Path = Path() //外圆的path
private var viewStatus = AnimStatus.NONE
private var isTopAnim:Boolean=false
private var animatorValue: Float = 0.0f //动画变量，0-1
//属性动画
private lateinit var startAnim: ValueAnimator
private lateinit var searingAnim: ValueAnimator
private lateinit var endAnim: ValueAnimator
private enum class AnimStatus { //标志动画状态
NONE, START, SEARING, END//初始状态，开始搜索，搜索中，结束搜索
}
init {
initPaint()
initAnimator()
initEvent()
}
private fun initAnimator() {
//AnimStatus.START状态的动画
startAnim = ValueAnimator.ofFloat(0f, 1f)
startAnim.duration = 1000
startAnim.addUpdateListener { animation ->
animatorValue = animation.animatedValue as Float
invalidate()
}
//AniStatus.SEARING状态动画
searingAnim = ValueAnimator.ofFloat(0f, 1f)
searingAnim.interpolator = LinearInterpolator()
searingAnim.duration=1500
searingAnim.repeatCount=ValueAnimator.INFINITE
searingAnim.repeatMode=ValueAnimator.RESTART
searingAnim.addUpdateListener { animation ->
if (viewStatus==AnimStatus.SEARING) { //这里必须添加，不然放大镜会有一刹那全部显示
animatorValue = animation.animatedValue as Float
invalidate()
}
}
//AniStatus.END状态动画
endAnim = ValueAnimator.ofFloat(1f, 0f)
endAnim.duration=1000
endAnim.addUpdateListener { animation ->
animatorValue = animation.animatedValue as Float
invalidate()
}
}
private fun initPaint() {
mPaint.color = Color.BLUE
mPaint.isAntiAlias = true
mPaint.style = Paint.Style.STROKE
mPaint.strokeCap = Paint.Cap.ROUND
mPaint.strokeWidth = 8f
}
1、onSizeChang()中得到组件大小
override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
super.onSizeChanged(w, h, oldw, oldh)
mWidth = w.toFloat()
mHeight = h.toFloat()
initPath()
}
//2、填充Path的放大镜和外圆
private fun initPath() {
cicleRecf = RectF(-mWidth / 2 * offestFactoty, -mHeight / 2 * offestFactoty, mWidth / 2 * offestFactoty, mHeight / 2 * offestFactoty)
searchRecf = RectF(-mWidth / 5, -mHeight / 5, mWidth / 5, mHeight / 5)
searchPath.addArc(searchRecf, 45f, 359.9f)
ciclePath.addArc(cicleRecf, 45f, 359.9f)
val pathMeasure = PathMeasure(ciclePath, false)
val floatArray = FloatArray(2)
val posTan = pathMeasure.getPosTan(0f, floatArray, null)
searchPath.lineTo(floatArray[0], floatArray[1])//放大镜的手柄
}
override fun onDraw(canvas: Canvas?) {
canvas?.translate(mWidth / 2, mHeight / 2)//移动坐标到组件中心
when (viewStatus) {
AnimStatus.NONE -> { //初识转态
canvas?.drawPath(searchPath, mPaint)
}
AnimStatus.START -> { //开始搜索
val pathMeasure = PathMeasure(searchPath, false)
val dst = Path()
pathMeasure.getSegment(pathMeasure.length * animatorValue, pathMeasure.length, dst, true)
canvas?.drawPath(dst, mPaint)
}
AnimStatus.SEARING -> { //搜索中
val pathMeasure = PathMeasure(ciclePath, false)
val dst = Path()
val stop = pathMeasure.length * animatorValue
val start = (stop - (0.5 - Math.abs(animatorValue - 0.5)) * pathMeasure.length/2).toFloat()
pathMeasure.getSegment(start,stop, dst, true)
canvas?.drawPath(dst, mPaint)
}
AnimStatus.END -> { //搜索结束
val pathMeasure = PathMeasure(searchPath, false)
val dst = Path()
pathMeasure.getSegment(pathMeasure.length*animatorValue , pathMeasure.length, dst, true)
canvas?.drawPath(dst, mPaint)
}
}
}
/**
* 开始动画
*/
fun startAnim() {
viewStatus=AnimStatus.START
startAnim.start()
this.isClickable = false
}
/**
* 结束动画
*/
fun stopAnim(){
isTopAnim=true
}
/**
* 监听动画结束
*/
private fun initEvent() {
val listener: Animator.AnimatorListener = object : Animator.AnimatorListener {
override fun onAnimationRepeat(animation: Animator?) {
if (isTopAnim) {
animation?.cancel()
viewStatus=AnimStatus.END
endAnim.start()
}
}
override fun onAnimationEnd(animation: Animator?) {
val name = Thread.currentThread().name
LogUtil.i(name)
when (viewStatus) {
AnimStatus.START -> {
searingAnim.start()
viewStatus=AnimStatus.SEARING
}
AnimStatus.END -> {
viewStatus = AnimStatus.NONE
[email protected] = true
isTopAnim=false
}
}
}
override fun onAnimationCancel(animation: Animator?) {
}
override fun onAnimationStart(animation: Animator?) {
}
}
startAnim.addListener(listener)
searingAnim.addListener(listener)
endAnim.addListener(listener)
}
}
运行效果
效果gif