Android 数字跳动动画超简单实现

效果预览

numberdance.gif

仅需几行代码(Kotlin)

inline fun TextView.startNumberDanceAnimation(number: Number, duration: Long) {
    val ani = ValueAnimator.ofFloat(0f, number.toFloat()).setDuration(duration)
    val format = "%1\$01.${if (number is Float) "2" else "0"}f"
    ani.interpolator = AccelerateInterpolator()
    ani.addUpdateListener {
        text = String.format(format, it.animatedValue)
    }
    ani.start()
}

调用函数

val tv = findViewById<TextView>(R.id.tvNumber)
val tv2 = findViewById<TextView>(R.id.tvNumber2)
tv.startNumberDanceAnimation(3001, 900)
tv2.startNumberDanceAnimation(8060.33f, 900)

方案优势

1）一个函数即可实现，无需引入新的TextView子类；
2）代码简单易维护;

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