How to Implement Interstitial Ad in Flutter | AdMob Integration Guide for Flutter Apps

In this step-by-step Flutter tutorial, you’ll learn **how to implement an Interstitial Ad in Flutter** using **Google AdMob**. Interstitial ads are **full-screen ads** that appear at natural breaks or transition points in your app—making them an effective way to monetize your Flutter applications while maintaining a smooth user experience.

This guide covers **everything from setting up AdMob in Flutter** to **loading and displaying interstitial ads** at the right time. Whether you’re new to Flutter or already have experience, this tutorial will help you integrate ads properly without violating Google’s ad policies.

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**What You’ll Learn:**

* How to create an **AdMob account** and get your Interstitial Ad Unit ID
* How to set up the **google\_mobile\_ads** Flutter package
* How to initialize the Mobile Ads SDK in your Flutter app
* How to load an interstitial ad in the background
* How to show the ad at the right time (e.g., after a game level, button click, or screen change)
* Best practices to **avoid policy violations** and maintain a good user experience

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**Step-by-Step Implementation:**

1. **Set up AdMob account** and create an Interstitial Ad Unit.
2. **Add `google_mobile_ads` dependency** in your `pubspec.yaml`.
3. **Initialize Mobile Ads SDK** in your `main.dart`.
4. **Load the interstitial ad** using `InterstitialAd.load()`.
5. **Show the ad** when ready by calling `.show()` method at the appropriate event.
6. Handle **ad events** like `onAdLoaded`, `onAdFailedToLoad`, and `onAdDismissedFullScreenContent`.

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**Pro Tips:**

* Never show ads too frequently—this can lead to a bad user experience and potential AdMob policy violations.
* Test with **sample Ad Unit IDs** provided by Google before going live.
* Always check `isLoaded` before showing an ad to prevent app crashes.
* Choose strategic display points—such as **after a game level or when exiting a screen**—to keep engagement high.

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