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使用Android如何實現一個長按圓環動畫View效果?相信很多沒有經驗的人對此束手無策,為此本文總結了問題出現的原因和解決方法,通過這篇文章希望你能解決這個問題。
一、需求來源
最近想到一個需求,類似悅跑圈或者Keep的結束按鈕動畫
二、思路代碼
該動畫按鈕的主要作用就是防止用戶誤操作,具體實現思路如下:
1、監聽用戶的觸摸事件OnTouchListener,在ACTION_DOWN的時候,記錄下xy坐標和觸摸時間,同時start自定義View動畫;在ACTION_MOVE的過程中,判斷坐標差值的偏移量是否在一個可接受的范圍內,是的話就保留當前動畫,不是的話就清除按鈕上繪制的path;在ACTION_UP的時候,再次記錄下觸摸時間,比較兩個時間是否達到了長按規定的時間,是的話就執行下一個事件,不是的話就停止動畫重置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、就是在自定義View里arcTo畫一個圓,再使用屬性動畫來監聽動畫的播放即可
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
最終實現效果圖雖然沒有上面那么好看,但基本效果還是達到了
四、全部代碼
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: 長按動畫View */ class LongCircleView(context: Context?, attrs: AttributeSet?) : View(context, attrs) { /** * 畫筆 */ private val paint = Paint() private var arcPath: Path? = null private var rectF: RectF? = null private var lineColor = 0 /** * 中心點坐標、半徑 */ 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() // 清除直線數據,保留數據結構,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="閃燈開" android:tint="@color/main_color" /> <TextView android:id="@+id/flashTV" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="閃燈" 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 } })
看完上述內容,你們掌握使用Android如何實現一個長按圓環動畫View效果的方法了嗎?如果還想學到更多技能或想了解更多相關內容,歡迎關注億速云行業資訊頻道,感謝各位的閱讀!
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