通过语义化的 API 创建 Shape Drawable - DrawableBuilder

**
 * author : ruibin1 (ruibin1@staff.weibo.com)
 * docs   : https://github.com/maoruibin/maoruibin.github.com/issues/88
 * build  : 2019/3/21 - 3:55 PM.
 */
public class DrawableBuilder {
    //默认线条粗细 1dp
    private static final int defaultLineWidth = 1;
    private static final int defaultLineColor = Color.parseColor("#e9e9e9");

    private static final int defaultCornerRadius= 2;
    //椭圆形圆角
    private static final int defaultRoundCornerRadius= 100;

    //默认虚线条单位长度 6dp
    private static final int defaultDashWidth = 6;
    //默认虚线条之间的间距 2dp
    private static final int defaultDashGap = 2;

    private int shape = RECTANGLE;
    private int lineWidth = 0;
    @ColorInt
    private int lineColor = Color.TRANSPARENT;
    private float cornerRadius = DeviceInfo.convertDpToPx(2);
    /**
     * 背景颜色，默认透明
     */
    @ColorInt private  int bkColor = Color.TRANSPARENT;
    /**
     *  虚线边框每个单元的长度
     */
    private float dashWidth = 0;
    /**
     * 虚线边框每个单元之间的间距
     */
    private float dashGap = 0;

    public DrawableBuilder() {
    }

    public Drawable build() {
        final GradientDrawable bg = new GradientDrawable();
        bg.setShape(shape);
        bg.setStroke(lineWidth,lineColor,dashWidth,dashGap);
        bg.setCornerRadius(cornerRadius);
        bg.setColor(bkColor);
        return bg;
    }

    public DrawableBuilder shape(int shape) {
        this.shape = shape;
        return this;
    }

    /**
     * 默认生成一个 1 dp 939393 的园线
     * @return
     */
    public DrawableBuilder line() {
        return line(defaultLineWidth,defaultLineColor);
    }

    /**
     * 构造线框
     * @param width
     * @param color
     * @return
     */
    public DrawableBuilder line(int width,int color) {
        return lineWidth(width).lineColor(color);
    }

    public DrawableBuilder line(int width,String color) {
        return lineWidth(width).lineColor(color);
    }

    /**
     * 设置边框线条粗细 直接传入具体数值
     *
     * @return
     */
    public DrawableBuilder lineWidth(int lineWidth) {
        this.lineWidth = DeviceInfo.convertDpToPx(lineWidth);
        return this;
    }

    public DrawableBuilder lineColor(int lineColor) {
        this.lineColor = lineColor;
        return this;
    }

    public DrawableBuilder lineColor(String lineColor) {
        if (lineColor.charAt(0) != '#'){
            throw new IllegalArgumentException("color value must be start with # like #000000");
        }
        return lineColor(Color.parseColor(lineColor));
    }

    /**
     * 设置圆角度数，直接传入具体数值
     * @param cornerRadius
     * @return
     */
    public DrawableBuilder corner(float cornerRadius) {
        this.cornerRadius = DeviceInfo.convertDpToPx(cornerRadius);
        return this;
    }

    /**
     * 配置默认的圆角度数 为2
     * @return
     */
    public DrawableBuilder corner() {
        return corner(defaultCornerRadius);
    }

    /**
     * 大圆角
     * @return
     */
    public DrawableBuilder roundCorner() {
        return corner(defaultRoundCornerRadius);
    }

    public DrawableBuilder fill(@ColorInt int bkColor) {
        this.bkColor = bkColor;
        return this;
    }

    public DrawableBuilder fill(String bkColor) {
        if (bkColor.charAt(0) != '#'){
            throw new IllegalArgumentException("color value must be start with # like #000000");
        }
        return fill(Color.parseColor(bkColor));
    }

    /**
     * 生成一个默认的虚线 shape
     * @return
     */
    public DrawableBuilder dash() {
        return dashWidth(defaultDashWidth).dashGap(defaultDashGap);
    }

    public DrawableBuilder dashWidth(float dashWidth) {
        this.dashWidth = DeviceInfo.convertDpToPx(dashWidth);
        return this;
    }

    public DrawableBuilder dashGap(float dashGap) {
        this.dashGap = DeviceInfo.convertDpToPx(dashGap);
        return this;
    }
}

Review the supplied DrawableBuilder code and its use of Android's GradientDrawable and DeviceInfo conversion. Confirm how this builder is intended to be integrated into the project and verify the fluent shape, line, color, corner, fill, and dash APIs against the requested semantic Drawable creation behavior.