Blankj/AndroidUtilCode · error · IllegalArgumentException

no menus

Error message

no menus

What it means

SwipeRightMenu is a horizontal LinearLayout: the child at index 0 is the main content and every child at index >= 1 is a swipe-revealed menu action. initView() (scheduled via post(), so it runs after the view is attached) reads getChildCount() and throws IllegalArgumentException("no menus") when it is <= 1, i.e. there is content but no menu children to reveal.

Source

Thrown at lib/utildebug/src/main/java/com/blankj/utildebug/base/view/SwipeRightMenu.java:61

    public SwipeRightMenu(Context context) {
        this(context, null);
    }

    public SwipeRightMenu(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        setOrientation(HORIZONTAL);
        post(new Runnable() {
            @Override
            public void run() {
                initView();
            }
        });
    }

    private void initView() {
        int childCount = getChildCount();
        if (childCount <= 1) {
            throw new IllegalArgumentException("no menus");
        }
        mContentView = getChildAt(0);

        for (int i = 1; i < childCount; i++) {
            MenuBean bean = new MenuBean(getChildAt(i));
            mMenus.add(bean);
            if (i == 1) {
                bean.setCloseMargin(0);
            } else {
                bean.setCloseMargin(-mMenus.get(i - 2).getWidth());
            }
            mMenusWidth += bean.getWidth();
        }
        for (int i = 0; i < mMenus.size(); i++) {
            mMenus.get(i).setOpenMargin(0);
        }
    }

View on GitHub (pinned to 7b4caf9e54)

Solutions

1. Add at least one extra child view to SwipeRightMenu in XML (or before attach): index 0 is content, index 1+ are the menus, so getChildCount() must be >= 2.
2. If menus are added dynamically, add them before the view is attached/laid out so they exist when the posted initView() callback executes.
3. After setContentView/inflation, assert getChildCount() >= 2 to fail with a clearer message than the library's.

Example fix

// before
<com.blankj.utildebug.base.view.SwipeRightMenu
    android:id="@+id/swipeMenu"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="Content" />
    <!-- only content, no menu child -> throws "no menus" -->
</com.blankj.utildebug.base.view.SwipeRightMenu>

// after
<com.blankj.utildebug.base.view.SwipeRightMenu ...>
    <TextView ... android:text="Content" />
    <TextView ... android:text="Delete" />   <!-- menu child at index 1 -->
</com.blankj.utildebug.base.view.SwipeRightMenu>

ViewGroup menu = findViewById(R.id.swipeMenu);
if (menu.getChildCount() < 2) {
    throw new IllegalStateException(
        "SwipeRightMenu needs >=1 menu child besides content; found "
        + (menu.getChildCount() - 1));
}

private static boolean hasSwipeMenus(ViewGroup v) {
    return v != null && v.getChildCount() > 1;
}

When it happens

Trigger: Inflating or constructing SwipeRightMenu with only a single child view (the content) and no additional menu-action views; or adding the view programmatically with just one child so that getChildCount() == 1 when the posted initView() runs.

Common situations: Layout XML places only the content view inside <SwipeRightMenu> and forgets the menu buttons; menu items are added in code but after the post() runnable already fired; a copy of the custom view omits the menu children.

Related errors

• ContentView is null.
• context is not instance of Activity.
• presenterClass is null!
• presenter of <{}> is not added!
• onCreateViewHolder: get holder from view type failed.

AI-assisted analysis of Blankj/AndroidUtilCode@7b4caf9e54 (2026-08-14). Data as JSON: /api/errors/1937c5126b4f67e3. Report an issue: GitHub.