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使用Android如何实现一个长按圆环动画View效果?相信很多没有经验的人对此束手无策,为此本文总结了问题出现的原因和解决方法,通过这篇文章希望你能解决这个问题。
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 } })
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