didi/DoKit · error · IllegalArgumentException

Use setStrokeWidth method of Paint class to specify line siz

Error message

Use setStrokeWidth method of Paint class to specify line size. Do not provider SizeProvider if you set PaintProvider.

What it means

Thrown by FlexibleDividerDecoration.Builder.checkBuilderParams() when both a PaintProvider and a SizeProvider are set. SizeProvider controls divider thickness, but a supplied Paint already defines thickness via paint.setStrokeWidth, so configuring both is contradictory and rejected at build() time.

Source

Thrown at Android/dokit/src/main/java/com/didichuxing/doraemonkit/kit/toolpanel/decoration/FlexibleDividerDecoration.java:549

        public T showLastDivider() {
            mShowLastDivider = true;
            return (T) this;
        }

        public T positionInsideItem(boolean positionInsideItem) {
            mPositionInsideItem = positionInsideItem;
            return (T) this;
        }

        protected void checkBuilderParams() {
            if (mPaintProvider != null) {
                if (mColorProvider != null) {
                    throw new IllegalArgumentException(
                            "Use setColor method of Paint class to specify line color. Do not provider ColorProvider if you set PaintProvider.");
                }
                if (mSizeProvider != null) {
                    throw new IllegalArgumentException(
                            "Use setStrokeWidth method of Paint class to specify line size. Do not provider SizeProvider if you set PaintProvider.");
                }
            }
        }
    }
}

View on GitHub (pinned to 626827cddb)

Solutions

1. Remove the SizeProvider/size() call and set thickness on the Paint: paint.setStrokeWidth(dp) before supplying the PaintProvider
2. Keep SizeProvider and drop PaintProvider if you only need a custom size
3. Set stroke width per-item inside the PaintProvider when sizes vary by position

Example fix

// before
builder.paintProvider(() -> paint)
       .size(4) // throws in checkBuilderParams()
       .build();

// after
paint.setStrokeWidth(4);
builder.paintProvider(() -> paint)
       .build();

if (paintProvider != null) {
    // ensure no size()/sizeProvider() was set: set stroke width on the Paint itself
    paint.setStrokeWidth(dpToPx);
}
builder.paintProvider(() -> paint).build(); // no SizeProvider set

When it happens

Trigger: Calling builder.paintProvider(...) and builder.size(...) (or sizeProvider(...)) on the same divider builder, then build(); commonly hit when a shared divider builder is reused and a size was set earlier in the chain.

Common situations: Incremental migration from simple color/size configuration to a full PaintProvider without cleaning up prior size() calls; builders assembled from helper methods that each add their own provider

Related errors

• Use setColor method of Paint class to specify line color. Do
• Set circle needn't set radius.
• invalid shadow size
• failed to get size
• failed to get size

AI-assisted analysis of didi/DoKit@626827cddb (2026-08-14). Data as JSON: /api/errors/3dd736f6ad324862. Report an issue: GitHub.