Handle callbacks from background thread

AI-generated Key Takeaways

• Ad load and event callbacks from the Google Mobile Ads SDK run on a background thread.

• UI-related operations within these callbacks must be explicitly dispatched to the UI thread.

• Examples are provided in Kotlin and Java for adding a banner view to the view hierarchy after an ad loads.

Last updated: January 10, 2025

This page covers the instructions to handle callbacks from a background thread.

Google Mobile Ads SDK (beta) runs ad load and event callbacks on a background thread. When performing UI-related operations within these callbacks, ensure you explicitly dispatch them to the UI thread.

The following examples add a banner view to view hierarchy after an ad loads:

Kotlin

BannerAd.load(
  adRequest,
  object : AdLoadCallback<BannerAd> {
    override fun onAdLoaded(ad: BannerAd) {
      // Add the banner view to the view hierarchy on the UI thread.
      activity?.runOnUiThread {
        binding.bannerViewContainer.addView(ad.getView(requireActivity()))
      }
    }
  },
)

Java

BannerAd.load(
    adRequest,
    new AdLoadCallback<BannerAd>() {
      @Override
      public void onAdLoaded(@NonNull BannerAd ad) {
        // Add the banner view to the view hierarchy on the UI thread.
        runOnUiThread(
            () -> binding.bannerViewContainer.addView(ad.getView(MainActivity.this)));
      }
    });