Android 自定义实现灯带跑马灯效果

public class MyMarqueeView extends View {

    private Paint paint;
    private RectF rect;
    private float startX, startY, endX, endY;
    private float currentX,currentY;
    /**
     * 灯大小
     */
    private int radius = 15;
    /**
     * 多少毫秒绘制一个圆点
     * 最小80
     */
    private int time = 100;
    /**
     * 绘制的圆点个数，如果数量等于全部数量重新绘制或者取消
     */
    int drawNumber = 1;
    private int[] myColors = new int[]{Color.YELLOW,Color.BLUE,Color.RED,Color.GREEN};
    private String colorPurple = "#8000FF";
    private String colorOrange = "#FFA500";
    private String colorPink = "#FFC0CB";
    private String colorGolden = "#D4AF37";
    public MyMarqueeView(Context context) {
        super(context);
        init();
    }

    public MyMarqueeView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public MyMarqueeView(Context context, AttributeSet attrs, int defStyleA