material-components/material-components-android · error · IllegalArgumentException

The view is not associated with SideSheetBehavior

Error message

The view is not associated with SideSheetBehavior

What it means

SideSheetBehavior.from(view) throws IllegalArgumentException when the view IS a CoordinatorLayout child but its LayoutParams carry no SideSheetBehavior — the required app:layout_behavior is missing or points at another behavior. from() is the typed accessor that assumes the wiring is already done.

Source

Thrown at lib/java/com/google/android/material/sidesheet/SideSheetBehavior.java:1173

        };
  }

  /**
   * A utility function to get the {@link SideSheetBehavior} associated with the {@code view}.
   *
   * @param view The {@link View} with {@link SideSheetBehavior}.
   * @return The {@link SideSheetBehavior} associated with the {@code view}.
   */
  @NonNull
  @SuppressWarnings("unchecked")
  public static <V extends View> SideSheetBehavior<V> from(@NonNull V view) {
    ViewGroup.LayoutParams params = view.getLayoutParams();
    if (!(params instanceof LayoutParams)) {
      throw new IllegalArgumentException("The view is not a child of CoordinatorLayout");
    }
    CoordinatorLayout.Behavior<?> behavior = ((LayoutParams) params).getBehavior();
    if (!(behavior instanceof SideSheetBehavior)) {
      throw new IllegalArgumentException("The view is not associated with SideSheetBehavior");
    }
    return (SideSheetBehavior<V>) behavior;
  }

  private void updateAccessibilityActions() {
    if (viewRef == null) {
      return;
    }
    V child = viewRef.get();
    if (child == null) {
      return;
    }
    ViewCompat.removeAccessibilityAction(child, AccessibilityNodeInfoCompat.ACTION_EXPAND);
    ViewCompat.removeAccessibilityAction(child, AccessibilityNodeInfoCompat.ACTION_DISMISS);

    if (state != STATE_HIDDEN) {
      replaceAccessibilityActionForState(
          child, AccessibilityActionCompat.ACTION_DISMISS, STATE_HIDDEN);

View on GitHub (pinned to ac7e18efee)

Solutions

1. Add app:layout_behavior="com.google.android.material.sidesheet.SideSheetBehavior" to the sheet view inside the CoordinatorLayout.
2. Or set it in code: ((CoordinatorLayout.LayoutParams) view.getLayoutParams()).behavior = new SideSheetBehavior<>();
3. Double-check the fully-qualified behavior string for typos.

Example fix

<!-- before -->
<View android:id="@+id/sheet" android:layout_width="wrap_content" ... />

<!-- after -->
<com.google.android.material.sidesheet.SheetContentView
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/sheet"
    app:layout_behavior="com.google.android.material.sidesheet.SideSheetBehavior" ... />

ViewParent p = sheetView.getParent();
if (p instanceof CoordinatorLayout
    && ((CoordinatorLayout.LayoutParams) sheetView.getLayoutParams()).getBehavior()
        instanceof SideSheetBehavior) {
  SideSheetBehavior<View> behavior = SideSheetBehavior.from(sheetView);
}

static boolean hasSideSheetBehavior(View v) {
  ViewGroup.LayoutParams lp = v.getLayoutParams();
  return lp instanceof CoordinatorLayout.LayoutParams
      && ((CoordinatorLayout.LayoutParams) lp).getBehavior() instanceof SideSheetBehavior;
}

When it happens

Trigger: Calling from(view) on a CoordinatorLayout child that lacks app:layout_behavior="...SideSheetBehavior", has a different behavior (e.g. BottomSheetBehavior), or sets behavior programmatically on the wrong LayoutParams instance.

Common situations: Forgetting the layout_behavior attribute when converting a plain view into a side sheet; typo in the behavior class string (silently yields no behavior); copying bottom-sheet layouts and changing the id but not the behavior.

Related errors

• The view is not a child of CoordinatorLayout
• The wrap overflow mode is not compatible to the vertical ori
• The wrap overflow mode is not compatible with wrap_content l
• All children of a RecyclerView using CarouselLayoutManager m
• Changing divider drawables have no effect. ChipGroup do not

AI-assisted analysis of material-components/material-components-android@ac7e18efee (2026-08-14). Data as JSON: /api/errors/4f5d3a680c360158. Report an issue: GitHub.