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

Cannot set showAnimator while the current showAnimator is ru

Error message

Cannot set showAnimator while the current showAnimator is running.

What it means

DrawableWithAnimatedVisibilityChange.setShowAnimator throws IllegalArgumentException if a replacement show animator is set while the current show animator is still running. Swapping an in-flight animator would orphan listeners and animation state, so the setter refuses until the running animation ends.

Source

Thrown at lib/java/com/google/android/material/progressindicator/DrawableWithAnimatedVisibilityChange.java:367

  public void setColorFilter(@Nullable ColorFilter colorFilter) {
    paint.setColorFilter(colorFilter);
    invalidateSelf();
  }

  @Override
  public int getOpacity() {
    return PixelFormat.TRANSLUCENT;
  }

  /**
   * Sets a value animator for show animation. This only takes effect when the drawable is not
   * currently being shown.
   *
   * @param showAnimator A ValueAnimator used for show animation.
   */
  private void setShowAnimator(@NonNull ValueAnimator showAnimator) {
    if (this.showAnimator != null && this.showAnimator.isRunning()) {
      throw new IllegalArgumentException(
          "Cannot set showAnimator while the current showAnimator is running.");
    }
    this.showAnimator = showAnimator;

    // Adds a listener to dispatch animation callbacks at the end.
    showAnimator.addListener(
        new AnimatorListenerAdapter() {
          @Override
          public void onAnimationStart(Animator animation) {
            super.onAnimationStart(animation);

            dispatchAnimationStart();
          }
        });
  }

  @NonNull
  ValueAnimator getHideAnimator() {

View on GitHub (pinned to ac7e18efee)

Solutions

1. Wait for the current show animation to end (listen for animation end) before replacing the animator
2. Cancel the running animator first, then set the new one
3. Set custom animators once during setup, before any show/hide animation can run

Example fix

// before
indicator.show()
indicator.getIndeterminateDrawable().setShowAnimator(newAnimator) // throws while running
// after
indicator.hide()
indicator.getIndeterminateDrawable().setShowAnimator(newAnimator)
indicator.show()

fun replaceShowAnimator(drawable: DrawableWithAnimatedVisibilityChange, animator: ValueAnimator) {
    drawable.hideNow() // ensure not mid-show
    drawable.setShowAnimator(animator)
}

catch (e: IllegalArgumentException) { Log.w(TAG, "Show animator running; deferring swap to animation end", e); deferSwapUntilAnimationEnd() }

When it happens

Trigger: Calling a method that replaces the show animator (e.g. mutating showAnimator on the drawable/indicator while it is mid show-animation); typically via custom animation injection right after show() was called.

Common situations: Customizing show/hide animators on a progress indicator drawable in response to config changes while the indicator is animating in; rapid successive API calls before the previous animation finished.

Related errors

• Cannot set hideAnimator while the current hideAnimator is ru
• Cannot change indeterminate animation type while the progres
• Cannot change indeterminate animation type while the progres
• Keylines being linearly interpolated must have the same item
• Keylines being linearly interpolated must have the same numb

AI-assisted analysis of material-components/material-components-android@ac7e18efee (2026-08-14). Data as JSON: /api/errors/a2019a8699edd49b. Report an issue: GitHub.