umano/AndroidSlidingUpPanel · error · java.lang.IllegalStateException

Height must have an exact value or MATCH_PARENT

Error message

Height must have an exact value or MATCH_PARENT

What it means

Same onMeasure validation as width, applied to height: the height measure spec must be EXACTLY or AT_MOST. The layout computes panel slide ranges from a concrete height, so UNSPECIFIED height is rejected.

Solutions

1. Set layout_height to match_parent or a fixed dp value on SlidingUpPanelLayout
2. Keep wrap_content on the inner panel child only if supported, never on the root
3. Ensure the parent provides bounded height (avoid raw ScrollView wrapping)

Example fix

// before
<SlidingUpPanelLayout android:layout_height="wrap_content" ... />
// after
<SlidingUpPanelLayout android:layout_height="match_parent" ... />

ViewGroup.LayoutParams lp = layout.getLayoutParams();
if (lp != null && lp.height == ViewGroup.LayoutParams.WRAP_CONTENT) lp.height = ViewGroup.LayoutParams.MATCH_PARENT;

When it happens

Trigger: SlidingUpPanelLayout declared with layout_height="wrap_content" in a parent that measures with UNSPECIFIED height, or placed directly inside ScrollView/CoordinatorLayout setups that pass unbounded height.

Common situations: Developers try to make the panel height depend on its content by using wrap_content on the root layout instead of on the panel child.

Understand the failure class

Background: "Invalid value" and "allowed values are" config errors: what your library rejected and how to fix it — this error's family across 41 libraries.

Related errors

• Width must have an exact value or MATCH_PARENT
• Sliding up panel layout must have exactly 2 children!
• gravity must be set to either top or bottom
• Panel state cannot be null or DRAGGING.
• Parent view may not be null

AI-assisted analysis of umano/AndroidSlidingUpPanel@45a460435b (2026-09-11). Data as JSON: /api/errors/07e9132ab488c44c. Report an issue: GitHub.

Appendix: source

Thrown at library/src/main/java/com/sothree/slidinguppanel/SlidingUpPanelLayout.java:734

    }

    @Override
    protected void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        mFirstLayout = true;
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
        final int widthSize = MeasureSpec.getSize(widthMeasureSpec);
        final int heightMode = MeasureSpec.getMode(heightMeasureSpec);
        final int heightSize = MeasureSpec.getSize(heightMeasureSpec);

        if (widthMode != MeasureSpec.EXACTLY && widthMode != MeasureSpec.AT_MOST) {
            throw new IllegalStateException("Width must have an exact value or MATCH_PARENT");
        } else if (heightMode != MeasureSpec.EXACTLY && heightMode != MeasureSpec.AT_MOST) {
            throw new IllegalStateException("Height must have an exact value or MATCH_PARENT");
        }

        final int childCount = getChildCount();

        if (childCount != 2) {
            throw new IllegalStateException("Sliding up panel layout must have exactly 2 children!");
        }

        mMainView = getChildAt(0);
        mSlideableView = getChildAt(1);
        if (mDragView == null) {
            setDragView(mSlideableView);
        }

        // If the sliding panel is not visible, then put the whole view in the hidden state
        if (mSlideableView.getVisibility() != VISIBLE) {
            mSlideState = PanelState.HIDDEN;
        }

View on GitHub (pinned to 45a460435b)