开玩笑的说
身为一名ui仔，要有ui仔的态度，我本着开源的态度，让我的低代码去污染大家的眼睛，嘿嘿嘿嘿。我要同步大佬的技术，慢慢的拉成和我一致，我就不会被优化了
需求背景
最近因为业务需求，需要实现一个类似抖音的点赞效果，就是那个爱心噗噗往外蹦的那个。那就写写吧。
一、我们需要一个爱心出去的偏移效果
二、我们还需要判断是不是连点
三、处理touch事件
四、动画效果
五、就是咱们需要的事件回调了
接下来就是贴代码的时间了
/**
* 仿抖音点赞特效
* */
class LoveView(context: Context, @Nullable attrs: AttributeSet?, defStyleAttr: Int) :
ConstraintLayout(context, attrs, defStyleAttr) {
constructor(context: Context) : this(context, null)
constructor(context: Context, @Nullable attrs: AttributeSet?) : this(context, attrs, 0)
//随机爱心的旋转角度
var num = floatArrayOf(-35f, -25f, 0f, 25f, 35f)
//判断是否是连续的点击事件
private val mHits = LongArray(2)
var loveListener: LoveListener? = null
var isAdd = 1
//用这个来判断是否是双击事件，判断数组中pos=1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认为是双击事件，这时需要绘制爱心图片
override fun onTouchEvent(event: MotionEvent?): Boolean {
System.arraycopy(mHits, 1, mHits, 0, mHits.size - 1)
mHits[mHits.size - 1] = SystemClock.uptimeMillis()
if (mHits[0] >= (SystemClock.uptimeMillis() - 200)) {
var iv = ImageView(context)
//设置展示图片的大小
var lp = LayoutParams(250, 250)
//设置图片的相对坐标是父布局的左上角开始的
lp.leftToLeft = 0
lp.topToTop = 0
//设置图片相对于点击位置的坐标
lp.leftMargin = (event?.x!! - 150F).toInt()
lp.topMargin = (event.y - 230F).toInt()
//设置图片资源
iv.setImageDrawable(resources.getDrawable(R.drawable.icon_moment_love))
iv.layoutParams = lp
//把IV添加到父布局中
when (isAdd) {
0 -> {
addView(iv)
loveListener?.click()
var animatorSet = AnimatorSet()
animatorSet.play(
scaleAni(iv, "scaleX", 2f, 0.9f, 100, 0)
)
.with(scaleAni(iv, "scaleY", 2f, 0.9f, 100, 0))
.with(rotation(iv, 0, 0, num[Random.nextInt(4)]))
.with(alphaAni(iv, 0F, 1F, 100, 0))
.with(scaleAni(iv, "scaleX", 0.9f, 1F, 50, 150))
.with(scaleAni(iv, "scaleY", 0.9f, 1F, 50, 150))
.with(translationY(iv, 0f, -600F, 800, 400))
.with(alphaAni(iv, 1F, 0F, 300, 400))
.with(scaleAni(iv, "scaleX", 1F, 3f, 700, 400))
.with(scaleAni(iv, "scaleY", 1F, 3f, 700, 400))
animatorSet.start()
animatorSet.addListener(object : AnimatorListenerAdapter() {
override fun onAnimationEnd(animation: Animator?) {
super.onAnimationEnd(animation)
//当动画结束，把控件从父布局移除
removeViewInLayout(iv)
}
})
isAdd++
}
1 -> {
isAdd++
}
else -> {
isAdd = 0
}
}
return true
}
isAdd = 0
return super.onTouchEvent(event)
}
fun setLoveClick(loveListener: LoveListener) {
this.loveListener = loveListener
}
fun interface LoveListener {
fun click()
}
//vararg可变参数修饰符，此处可以传入多个Float类型值
private 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
}
private 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.duration = time
ani.startDelay = delayTime
return ani
}
fun translationY(
view: View,
from: Float,
to: Float,
time: Long,
delayTime: Long
): ObjectAnimator {
val ani = ObjectAnimator.ofFloat(view, "translationY", from, to)
ani.interpolator = LinearInterpolator()
ani.startDelay = delayTime
ani.duration = time
return ani
}
fun translationX(
view: View,
from: Float,
time: Long,
to: Float,
delayTime: Long
): ObjectAnimator {
val ani = ObjectAnimator.ofFloat(view, "translationX", from, to)
ani.startDelay = delayTime
ani.duration = time
ani.interpolator = LinearInterpolator()
return ani
}
fun scaleAni(
view: View,
propertyName: String,
from: Float,
to: Float,
time: Long,
delayTime: Long
): ObjectAnimator {
val ani = ObjectAnimator.ofFloat(view, propertyName, from, to)
ani.interpolator = LinearInterpolator()
ani.startDelay = delayTime
ani.duration = time
return ani
}
}
```
```
言简意赅，反正大家懒得看，我就不细说了，大家如果有问题可以评论，我看到回复的，祝大家事事平安
