我要评论一、需求来源
最近想到一个需求，类似悦跑圈或者keep的结束按钮动画
二、思路代码
该动画按钮的主要作用就是防止用户误操作，具体实现思路如下：
1、监听用户的触摸事件ontouchlistener，在action_down的时候，记录下xy坐标和触摸时间，同时start自定义view动画；在action_move的过程中，判断坐标差值的偏移量是否在一个可接受的范围内，是的话就保留当前动画，不是的话就清除按钮上绘制的path；在action_up的时候，再次记录下触摸时间，比较两个时间是否达到了长按规定的时间，是的话就执行下一个事件，不是的话就停止动画重置path。
val touchmax = 50
var lastx = 0
var lasty = 0
circleview.setontouchlistener(object : view.ontouchlistener{
override fun ontouch(p0: view?, motionevent: motionevent): boolean {
val endtime: long
val x = motionevent.x
val y = motionevent.y
when (motionevent.action) {
motionevent.action_down -> {
starttime = system.currenttimemillis()
lastx = x.toint()
lasty = y.toint()
circleview.startanim()
}
motionevent.action_up -> {
endtime = system.currenttimemillis()
val during = endtime - starttime
if (during < app.long_click_time) {
circleview.cancelanim()
circleview.clearall()
}else{
playmaxwarn()
}
}
motionevent.action_move -> {
if (abs(lastx - x) > touchmax || abs(lasty - y) > touchmax) {
circleview.clearall()
}
}
}
return false
}
})
2、就是在自定义view里arcto画一个圆，再使用属性动画来监听动画的播放即可
fun startanim() {
isclear = false
valueanimator = valueanimator.offloat(0f, 359.9999f)
valueanimator!!.duration = app.long_click_time
valueanimator!!.addupdatelistener { animation ->
mprogress = animation.animatedvalue as float
invalidate()
}
valueanimator!!.start()
}
三、效果展示
最终实现效果图虽然没有上面那么好看，但基本效果还是达到了
四、全部代码
package cn.xmliu.melongo.view
import android.animation.valueanimator
import android.content.context
import android.graphics.*
import android.util.attributeset
import android.view.view
import androidx.core.content.contextcompat
import cn.xmliu.melongo.app
import cn.xmliu.melongo.r
/**
* date: 2020/8/12 13:21
* email: diyangxia@163.com
* description: 长按动画view
*/
class longcircleview(context: context?, attrs: attributeset?) : view(context, attrs) {
/**
* 画笔
*/
private val paint = paint()
private var arcpath: path? = null
private var rectf: rectf? = null
private var linecolor = 0
/**
* 中心点坐标、半径
*/
private var centerx: float? = null
private var centery: float? = null
private var radius: float? = null
private var left = -1f
private var top = -1f
private var right = -1f
private var bottom = -1f
private val offset = 10
private var mprogress = -1f
private var valueanimator: valueanimator ?= null
private var isclear = true
init {
linecolor = contextcompat.getcolor(context!!, r.color.red)
}
override fun onsizechanged(w: int, h: int, oldw: int, oldh: int) {
super.onsizechanged(w, h, oldw, oldh)
centerx = width / 2.tofloat()
centery = height / 2.tofloat()
radius = height / 2.tofloat()
left = centerx!! - radius!! + offset
top = centery!! - radius!! + offset
right = centerx!! + radius!! - offset
bottom = centery!! + radius!! - offset
rectf = rectf(left, top, right, bottom)
arcpath = path()
}
override fun ondraw(canvas: canvas?) {
super.ondraw(canvas)
paint.isantialias = true
paint.color = linecolor
paint.style = paint.style.stroke
paint.strokewidth = 10f
arcpath!!.rewind() // 清除直线数据，保留数据结构，方便快速重用
if(isclear) return
arcpath!!.arcto(rectf!!, 270f, mprogress)
canvas?.drawpath(arcpath!!, paint)
}
fun startanim() {
isclear = false
valueanimator = valueanimator.offloat(0f, 359.9999f)
valueanimator!!.duration = app.long_click_time
valueanimator!!.addupdatelistener { animation ->
mprogress = animation.animatedvalue as float
invalidate()
}
valueanimator!!.start()
}
fun cancelanim(){
valueanimator!!.cancel()
}
fun clearall() {
isclear = true
invalidate()
}
}
<relativelayout
android:layout_width="wrap_content"
android:layout_margintop="5dp"
android:layout_height="wrap_content">
<linearlayout
android:id="@+id/flashlayout"
android:layout_centerinparent="true"
android:layout_width="70dp"
android:layout_height="70dp"
android:background="@drawable/btn_circle_white"
android:gravity="center_horizontal"
android:orientation="vertical">
<imageview
android:id="@+id/flashiv"
android:layout_width="40dp"
android:layout_height="40dp"
android:padding="7dp"
android:src="@drawable/menu_flash_black"
android:text="闪灯开"
android:tint="@color/main_color" />
<textview
android:id="@+id/flashtv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="闪灯"
android:textcolor="@color/main_color" />
</linearlayout>
<cn.xmliu.melongo.view.longcircleview
android:id="@+id/circleview"
android:layout_width="80dp"
android:layout_height="80dp" />
</relativelayout>
val touchmax = 50
var lastx = 0
var lasty = 0
circleview.setontouchlistener(object : view.ontouchlistener{
override fun ontouch(p0: view?, motionevent: motionevent): boolean {
val endtime: long
val x = motionevent.x
val y = motionevent.y
when (motionevent.action) {
motionevent.action_down -> {
starttime = system.currenttimemillis()
lastx = x.toint()
lasty = y.toint()
circleview.startanim()
}
motionevent.action_up -> {
endtime = system.currenttimemillis()
val during = endtime - starttime
if (during < app.long_click_time) {
circleview.cancelanim()
circleview.clearall()
}else{
flashtv.text = "ok"
}
}
motionevent.action_move -> {
if (abs(lastx - x) > touchmax || abs(lasty - y) > touchmax) {
circleview.clearall()
}
}
}
return false
}
})
总结
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