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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                除了四種系統提供的`View`動畫之外,我們還可以自定義動畫。同樣的需要繼承自`Animation`這個抽象類,然后重寫`initializate`和`applyTransformation`這兩個方法。一個用來初始化,一個用來做矩陣變換。比如下面的案例: ~~~ class CustomViewAnimation:Animation() { var mCW: Float? = null var mCH: Float? = null override fun initialize(width: Int, height: Int, parentWidth: Int, parentHeight: Int) { // 設置默認時長 duration = 5000 // 保持動畫的結束狀態 fillAfter = true // 設置插值器,改變動畫播放速度 interpolator = AccelerateDecelerateInterpolator() // 找到中心坐標 mCW = width * 1.0f / 2; mCH = height * 1.0f / 2; super.initialize(width, height, parentWidth, parentHeight) } override fun applyTransformation(interpolatedTime: Float, t: Transformation?) { super.applyTransformation(interpolatedTime, t) t?.matrix?.preScale(1f, 1 - interpolatedTime, mCW!!, mCH!!) } } ~~~ 然后引用在`Button`上,這里我將其寬高做了調整: ~~~ btn.setOnClickListener { val animation = CustomViewAnimation() btn.startAnimation(animation) } ~~~ 結果: ![](https://img.kancloud.cn/00/38/0038352e2499c693d4061533d09d2182_380x276.png)
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                              哎呀哎呀视频在线观看