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

Transient bottom bar must have non-null content

Error message

Transient bottom bar must have non-null content

What it means

IllegalArgumentException from the BaseTransientBottomBar constructor when the content View is null. The content view is what gets inflated into the transient bar; a null means the caller (usually a subclass or custom transient) passed an unresolved or not-yet-created view.

Source

Thrown at lib/java/com/google/android/material/snackbar/BaseTransientBottomBar.java:358

   * @param contentViewCallback The content view callback for this transient bottom bar.
   */
  protected BaseTransientBottomBar(
      @NonNull ViewGroup parent,
      @NonNull View content,
      @NonNull com.google.android.material.snackbar.ContentViewCallback contentViewCallback) {
    this(parent.getContext(), parent, content, contentViewCallback);
  }

  protected BaseTransientBottomBar(
      @NonNull Context context,
      @NonNull ViewGroup parent,
      @NonNull View content,
      @NonNull com.google.android.material.snackbar.ContentViewCallback contentViewCallback) {
    if (parent == null) {
      throw new IllegalArgumentException("Transient bottom bar must have non-null parent");
    }
    if (content == null) {
      throw new IllegalArgumentException("Transient bottom bar must have non-null content");
    }
    if (contentViewCallback == null) {
      throw new IllegalArgumentException("Transient bottom bar must have non-null callback");
    }

    targetParent = parent;
    this.contentViewCallback = contentViewCallback;
    this.context = context;

    ThemeEnforcement.checkAppCompatTheme(context);

    LayoutInflater inflater = LayoutInflater.from(context);
    // Note that for backwards compatibility reasons we inflate a layout that is defined
    // in the extending Snackbar class. This is to prevent breakage of apps that have custom
    // coordinator layout behaviors that depend on that layout.
    view = (SnackbarBaseLayout) inflater.inflate(getSnackbarBaseLayoutResId(), targetParent, false);
    view.setBaseTransientBottomBar(this);
    if (content instanceof SnackbarContentLayout) {

View on GitHub (pinned to ac7e18efee)

Solutions

1. Verify the content view inflation succeeded before constructing the bar.
2. Check the layout ID passed to inflate matches an existing layout resource in all build variants/flavors.
3. Fail fast in debug builds with an assertion on non-null content.

Example fix

// before
new CustomTransient(parent, null /* content */, callback); // throws

// after
View content = inflater.inflate(R.layout.custom_transient_content, parent, false);
new CustomTransient(parent, content, callback);

View content = LayoutInflater.from(context).inflate(R.layout.my_content, parent, false);
if (content != null) {
  new MyTransientBar((ViewGroup) parent, content, callback).show();
}

When it happens

Trigger: Custom BaseTransientBottomBar subclasses passing a null content view; inflater.inflate(...) returning effectively unusable results being mis-handled; interop code where the content argument is optional and null slips through.

Common situations: Custom snackbars/transients with a content view loaded from a binding or findViewById that returned null (wrong ID or wrong layout in some configuration).

Related errors

• Transient bottom bar must have non-null parent
• Transient bottom bar must have non-null callback
• Unable to find anchor view with id:
• At least one value must be set
• The continuousModeTickCount(%s) must be greater than or equa

AI-assisted analysis of material-components/material-components-android@ac7e18efee (2026-08-14). Data as JSON: /api/errors/20e0c81269ee1452. Report an issue: GitHub.