仿抖音点赞爱心特效

https://blog.csdn.net/panghaha12138/article/details/84769183
先看效果图

gif2.gif
gif1.gif
附上github demo地址

最近项目没那么忙了，闲下来，看了一下抖音的点赞特效还是挺炫酷的，于是决定看看是怎么实现的。
其实就是一个图片ImageView进行平移，缩放，不透明度组合动画一起播放达到这个效果，原理很简单
上代码

import android.animation.Animator
import android.animation.AnimatorListenerAdapter
import android.animation.AnimatorSet
import android.animation.ObjectAnimator
import android.animation.TimeInterpolator
import android.content.Context
import android.os.SystemClock
import android.util.AttributeSet
import android.view.MotionEvent
import android.view.View
import android.view.animation.LinearInterpolator
import android.widget.ImageView
import android.widget.RelativeLayout
import java.util.*


/**
 * information：仿抖音点赞功能
 */

class Love2(context: Context) : RelativeLayout(context) {
    var mContext: Context? = null
    //动画中随机❤的旋转角度
    var num = floatArrayOf(-35f, -25f, 0f, 25f, 35f)

    //用来判断是否是连续的点击事件
    private val mHits = LongArray(3)

    constructor(context: Context, attrs: AttributeSet) : this(context) {
        mContext = context
    }


    override fun onTouchEvent(event: MotionEvent?): Boolean {

        System.arraycopy(mHits, 1, mHits, 0, mHits.size - 1)
        mHits[mHits.size - 1] = SystemClock.uptimeMillis()

        //用这个来判断是否是3击事件，判断数组中pos=2的点击事件的时间与数组中pos=0的点击事件的时间差值是否小于500，若是小于500认为是3击事件，这时需要绘制爱心图片
        if (mHits[0] >= (SystemClock.uptimeMillis() - 500)) {
            //点击是触发心形的图片add到整个view中，然后执行动画

            //有连续触摸的时候，创建一个展示心形的图片
            var iv: ImageView = ImageView(mContext)

            //设置展示的位置，需要在手指触摸的位置上方，即触摸点是心形的右下角的位置
            var lp: LayoutParams = LayoutParams(300, 300)
            lp.leftMargin = (event?.x!! - 150F).toInt()
            lp.topMargin = (event?.y!! - 300F).toInt()
            //设置图片资源
            iv.setImageDrawable(resources.getDrawable(R.mipmap.icon_home_like_after))
            iv.layoutParams = lp

            //把IV添加到父布局当中
            addView(iv)

            //设置控件的动画
            var animatorSet: AnimatorSet = AnimatorSet()
            animatorSet.play(
                    //缩放动画，X轴2倍缩小至0.9倍
                    scaleAni(iv, "scaleX", 2f, 0.9f, 100, 0))
                    //缩放动画，Y轴2倍缩放至0.9倍
                    .with(scaleAni(iv, "scaleY", 2f, 0.9f, 100, 0))
                    //旋转动画，随机旋转角
                    .with(rotation(iv, 0, 0, num[Random().nextInt(4)]))
                    //渐变透明动画，透明度从0-1
                    .with(alphaAni(iv, 0F, 1F, 100, 0))
                    //缩放动画，X轴0.9倍缩小至
                    .with(scaleAni(iv, "scaleX", 0.9f, 1F, 50, 150))
                    //缩放动画，Y轴0.9倍缩放至
                    .with(scaleAni(iv, "scaleY", 0.9f, 1F, 50, 150))
                    //位移动画，Y轴从0上移至600
                    .with(translationY(iv, 0F, -600F, 800, 400))
                    //透明动画，从1-0
                    .with(alphaAni(iv, 1F, 0F, 300, 400))
                    //缩放动画，X轴1至3倍
                    .with(scaleAni(iv, "scaleX", 1F, 3f, 700, 400))
                    //缩放动画，Y轴1至3倍
                    .with(scaleAni(iv, "scaleY", 1F, 3f, 700, 400))


            //开始动画
            animatorSet.start()
            //设置动画结束监听
            animatorSet.addListener(object : AnimatorListenerAdapter() {
                override fun onAnimationEnd(animation: Animator?) {
                    super.onAnimationEnd(animation)

                    //当动画结束以后，需要把控件从父布局移除
                    removeViewInLayout(iv)
                }
            })

        }

        return super.onTouchEvent(event)

    }


    fun scaleAni(view: View, propertyName: String, from: Float, to: Float, time: Long, delayTime: Long): ObjectAnimator {
        val ani: ObjectAnimator = ObjectAnimator.ofFloat(view, propertyName, from, to)
        ani.interpolator = LinearInterpolator()
        ani.startDelay = delayTime
        ani.duration = time
        return ani
    }

    fun translationX(view: View, from: Float, to: Float, time: Long, delayTime: Long): ObjectAnimator {
        val ani: ObjectAnimator = ObjectAnimator.ofFloat(view, "translationX", from, to)
        ani.interpolator = LinearInterpolator()
        ani.startDelay = delayTime
        ani.duration = time
        return ani
    }

    fun translationY(view: View, from: Float, to: Float, time: Long, delayTime: Long): ObjectAnimator {
        val ani: ObjectAnimator = ObjectAnimator.ofFloat(view, "translationY", from, to)
        ani.interpolator = LinearInterpolator()
        ani.startDelay = delayTime
        ani.duration = time
        return ani
    }

    fun alphaAni(view: View, from: Float, to: Float, time: Long, delayTime: Long): ObjectAnimator {
        val ani = ObjectAnimator.ofFloat(view, "alpha", from, to)
        ani.interpolator = LinearInterpolator()
        ani.startDelay = delayTime
        ani.duration = time
        return ani
    }

    fun rotation(view: View, time: Long, delayTime: Long, vararg values: Float): ObjectAnimator {
        val ani = ObjectAnimator.ofFloat(view, "rotation", *values)
        ani.duration = time
        ani.startDelay = delayTime
        ani.interpolator = TimeInterpolator { input -> input }
        return ani
    }

}

粉红爱心的图片可以下载一个抖音apk 改成.zip解压完去里面复制一个
附上github demo地址