Android 自定义Drawable实现跑马灯效果

这个跑马灯效果比自定义VIew实现丝滑，丝滑效果主要还是对颜色的取值比较关键

public class FluidColorfulFrameDrawable extends Drawable {

    private Paint paint;
    private RectF bounds;
    private RectF rectF = new RectF();
    private float defaultRadius = SizeUtils.dp2px(10);
    private float defaultStrokeWidth = SizeUtils.dp2px(10);
    private int colorPurple = Color.parseColor("#855bff");
    private int colorBlue = Color.parseColor("#3cfff8");
    private int colorGreen = Color.parseColor("#855bff");
    private int colorYellow = Color.parseColor("#ffd220");
    private int[] colors = {colorPurple,colorBlue, colorGreen,
            colorYellow,colorPurple,colorBlue, colorGreen,
            colorYellow,
            colorPurple,colorBlue, colorGreen};
    private int strokeWidth;
    private Matrix mtx = new Matrix();
    private float degree = 0f;

    public FluidColorfulFrameDrawable(int strokeWidth) {
        this.stroke