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Overview

Interstitial ads are full-screen ads that cover the entire screen. They are effective when displayed at natural transition points (e.g., after completing a game level, page transitions, etc.).

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Key Features

  • Full-screen ads that cover the entire display
  • Supports image and video ads
  • Provides fullscreen event callbacks
  • Flexible timing control with separate loading and showing
Use the test unit ID in development: PUBLIC_TEST_UNIT_ID_INTERSTITIAL

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AdropInterstitialAd

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Constructor

AdropInterstitialAd({
  required String unitId,
  AdropInterstitialListener? listener,
})
Parameters
ParameterTypeRequiredDescription
unitIdStringYUnit ID created in AdControl console
listenerAdropInterstitialListenerNAd event listener

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Properties

PropertyTypeDescription
isLoadedboolWhether the ad has finished loading
unitIdStringAd unit ID
creativeIdStringCreative ID
txIdStringTransaction ID
campaignIdStringCampaign ID
destinationURLStringDestination URL

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Methods

MethodReturn TypeDescription
load()Future<void>Loads the ad
show()Future<void>Displays the ad on screen
dispose()Future<void>Releases resources

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Basic Usage

import 'package:flutter/material.dart';
import 'package:adrop_ads_flutter/adrop_ads_flutter.dart';

class InterstitialExample extends StatefulWidget {
  const InterstitialExample({super.key});

  @override
  State<InterstitialExample> createState() => _InterstitialExampleState();
}

class _InterstitialExampleState extends State<InterstitialExample> {
  bool isLoaded = false;
  AdropInterstitialAd? interstitialAd;

  @override
  void initState() {
    super.initState();
    _createInterstitialAd();
  }

  void _createInterstitialAd() {
    interstitialAd = AdropInterstitialAd(
      unitId: 'YOUR_UNIT_ID',
      listener: AdropInterstitialListener(
        onAdReceived: (ad) {
          debugPrint('Interstitial ad loaded successfully: ${ad.creativeId}');
          setState(() {
            isLoaded = true;
          });
        },
        onAdFailedToReceive: (ad, errorCode) {
          debugPrint('Interstitial ad failed to load: $errorCode');
        },
        onAdClicked: (ad) {
          debugPrint('Interstitial ad clicked');
        },
        onAdDidPresentFullScreen: (ad) {
          debugPrint('Interstitial ad presented');
        },
        onAdDidDismissFullScreen: (ad) {
          debugPrint('Interstitial ad dismissed');
        },
        onAdFailedToShowFullScreen: (ad, errorCode) {
          debugPrint('Interstitial ad failed to show: $errorCode');
        },
      ),
    );
  }

  void loadAd() {
    interstitialAd?.load();
  }

  void showAd() {
    if (isLoaded) {
      interstitialAd?.show();
    }
  }

  @override
  void dispose() {
    interstitialAd?.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Interstitial Ad Example')),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            ElevatedButton(
              onPressed: loadAd,
              child: const Text('Load Ad'),
            ),
            const SizedBox(height: 16),
            ElevatedButton(
              onPressed: isLoaded ? showAd : null,
              child: const Text('Show Ad'),
            ),
          ],
        ),
      ),
    );
  }
}

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AdropInterstitialListener

Listener to handle interstitial ad events.

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Callbacks

AdropInterstitialListener(
  onAdReceived: (AdropAd ad) {
    // Ad loaded successfully
  },
  onAdClicked: (AdropAd ad) {
    // Ad clicked
  },
  onAdImpression: (AdropAd ad) {
    // Ad impression
  },
  onAdWillPresentFullScreen: (AdropAd ad) {
    // About to present ad (iOS only)
  },
  onAdDidPresentFullScreen: (AdropAd ad) {
    // Ad presented
  },
  onAdWillDismissFullScreen: (AdropAd ad) {
    // About to dismiss ad (iOS only)
  },
  onAdDidDismissFullScreen: (AdropAd ad) {
    // Ad dismissed
  },
  onAdFailedToReceive: (AdropAd ad, AdropErrorCode errorCode) {
    // Ad failed to load
  },
  onAdFailedToShowFullScreen: (AdropAd ad, AdropErrorCode errorCode) {
    // Ad failed to show
  },
)

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Callback Descriptions

CallbackDescription
onAdReceivedCalled when ad is loaded successfully
onAdClickedCalled when ad is clicked
onAdImpressionCalled when ad impression occurs
onAdWillPresentFullScreenCalled before ad is presented (iOS only)
onAdDidPresentFullScreenCalled after ad is presented
onAdWillDismissFullScreenCalled before ad is dismissed (iOS only)
onAdDidDismissFullScreenCalled after ad is dismissed
onAdFailedToReceiveCalled when ad fails to load
onAdFailedToShowFullScreenCalled when ad fails to show

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Ad Lifecycle

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Recreating Ads

Interstitial ads are single-use. Once shown, they cannot be displayed again, so you must recreate the instance to load a new ad. 
class _InterstitialState extends State<InterstitialWidget> {
  bool isLoaded = false;
  bool isShown = false;
  AdropInterstitialAd? interstitialAd;

  @override
  void initState() {
    super.initState();
    _createInterstitialAd();
  }

  void _createInterstitialAd() {
    interstitialAd?.dispose();
    interstitialAd = AdropInterstitialAd(
      unitId: 'YOUR_UNIT_ID',
      listener: AdropInterstitialListener(
        onAdReceived: (ad) {
          setState(() {
            isLoaded = true;
          });
        },
        onAdDidPresentFullScreen: (ad) {
          setState(() {
            isShown = true;
          });
        },
        onAdDidDismissFullScreen: (ad) {
          // Prepare new ad after dismissal
          _createInterstitialAd();
          interstitialAd?.load();
        },
      ),
    );

    setState(() {
      isLoaded = false;
      isShown = false;
    });
  }

  @override
  void dispose() {
    interstitialAd?.dispose();
    super.dispose();
  }
}

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Error Handling

class _InterstitialState extends State<InterstitialWidget> {
  bool isLoaded = false;
  AdropErrorCode? errorCode;
  AdropInterstitialAd? interstitialAd;

  void _createInterstitialAd() {
    interstitialAd = AdropInterstitialAd(
      unitId: 'YOUR_UNIT_ID',
      listener: AdropInterstitialListener(
        onAdReceived: (ad) {
          setState(() {
            isLoaded = true;
            errorCode = null;
          });
        },
        onAdFailedToReceive: (ad, error) {
          setState(() {
            isLoaded = false;
            errorCode = error;
          });
          _handleError(error);
        },
        onAdFailedToShowFullScreen: (ad, error) {
          setState(() {
            errorCode = error;
          });
          _handleError(error);
        },
      ),
    );
  }

  void _handleError(AdropErrorCode error) {
    switch (error) {
      case AdropErrorCode.network:
        debugPrint('Network error occurred.');
        break;
      case AdropErrorCode.adNoFill:
        debugPrint('No ad available to show.');
        break;
      case AdropErrorCode.adShown:
        debugPrint('Ad has already been shown.');
        break;
      default:
        debugPrint('Error occurred: ${error.code}');
    }
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        ElevatedButton(
          onPressed: interstitialAd?.load,
          child: const Text('Load Ad'),
        ),
        ElevatedButton(
          onPressed: isLoaded ? interstitialAd?.show : null,
          child: const Text('Show Ad'),
        ),
        if (errorCode != null)
          Text(
            'Error: ${errorCode?.code}',
            style: const TextStyle(color: Colors.red),
          ),
      ],
    );
  }
}

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Best Practices

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1. Show at Appropriate Times

Display interstitial ads at natural transition points. 
// Good: After level completion
void onLevelComplete() {
  showInterstitialAd();
  navigateToNextLevel();
}

// Bad: Right after app start
void onAppStart() {
  showInterstitialAd(); // Degrades user experience
}

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2. Preload Ads

Preloading ads allows you to show them without delay when needed. 
class GameScreen extends StatefulWidget {
  @override
  State<GameScreen> createState() => _GameScreenState();
}

class _GameScreenState extends State<GameScreen> {
  AdropInterstitialAd? interstitialAd;
  bool isAdReady = false;

  @override
  void initState() {
    super.initState();
    _preloadAd();
  }

  void _preloadAd() {
    interstitialAd = AdropInterstitialAd(
      unitId: 'YOUR_UNIT_ID',
      listener: AdropInterstitialListener(
        onAdReceived: (ad) {
          setState(() {
            isAdReady = true;
          });
        },
        onAdDidDismissFullScreen: (ad) {
          // Preload next ad
          _preloadAd();
        },
      ),
    );
    interstitialAd?.load();
  }

  void showAdIfReady() {
    if (isAdReady) {
      interstitialAd?.show();
      setState(() {
        isAdReady = false;
      });
    }
  }

  @override
  void dispose() {
    interstitialAd?.dispose();
    super.dispose();
  }
}

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3. Frequency Capping

Limit ad frequency for better user experience. 
class AdManager {
  static int _interstitialCount = 0;
  static const int _maxInterstitialsPerSession = 3;
  static DateTime? _lastInterstitialTime;
  static const Duration _minInterval = Duration(minutes: 2);

  static bool canShowInterstitial() {
    if (_interstitialCount >= _maxInterstitialsPerSession) {
      return false;
    }

    if (_lastInterstitialTime != null) {
      final elapsed = DateTime.now().difference(_lastInterstitialTime!);
      if (elapsed < _minInterval) {
        return false;
      }
    }

    return true;
  }

  static void onInterstitialShown() {
    _interstitialCount++;
    _lastInterstitialTime = DateTime.now();
  }
}

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4. Resource Management

Always release unused ad instances. 
@override
void dispose() {
  interstitialAd?.dispose();
  super.dispose();
}

​
Complete Example

import 'package:flutter/material.dart';
import 'package:adrop_ads_flutter/adrop_ads_flutter.dart';

class InterstitialAdPage extends StatefulWidget {
  const InterstitialAdPage({super.key});

  @override
  State<InterstitialAdPage> createState() => _InterstitialAdPageState();
}

class _InterstitialAdPageState extends State<InterstitialAdPage> {
  bool isLoaded = false;
  bool isLoading = false;
  bool isShown = false;
  AdropErrorCode? errorCode;
  AdropInterstitialAd? interstitialAd;

  @override
  void initState() {
    super.initState();
    _createInterstitialAd();
  }

  void _createInterstitialAd() {
    interstitialAd?.dispose();
    interstitialAd = AdropInterstitialAd(
      unitId: 'PUBLIC_TEST_UNIT_ID_INTERSTITIAL', // Test unit ID
      listener: AdropInterstitialListener(
        onAdReceived: (ad) {
          debugPrint('Ad loaded successfully');
          debugPrint('Creative ID: ${ad.creativeId}');
          debugPrint('Campaign ID: ${ad.campaignId}');
          setState(() {
            isLoaded = true;
            isLoading = false;
            errorCode = null;
          });
        },
        onAdClicked: (ad) {
          debugPrint('Ad clicked: ${ad.destinationURL}');
        },
        onAdImpression: (ad) {
          debugPrint('Ad impression: ${ad.creativeId}');
        },
        onAdWillPresentFullScreen: (ad) {
          debugPrint('Ad will present');
        },
        onAdDidPresentFullScreen: (ad) {
          debugPrint('Ad presented');
          setState(() {
            isShown = true;
          });
        },
        onAdWillDismissFullScreen: (ad) {
          debugPrint('Ad will dismiss');
        },
        onAdDidDismissFullScreen: (ad) {
          debugPrint('Ad dismissed');
          // Prepare new ad
          _createInterstitialAd();
        },
        onAdFailedToReceive: (ad, error) {
          debugPrint('Ad failed to load: $error');
          setState(() {
            isLoaded = false;
            isLoading = false;
            errorCode = error;
          });
        },
        onAdFailedToShowFullScreen: (ad, error) {
          debugPrint('Ad failed to show: $error');
          setState(() {
            errorCode = error;
          });
        },
      ),
    );

    setState(() {
      isLoaded = false;
      isShown = false;
      errorCode = null;
    });
  }

  void loadAd() {
    setState(() {
      isLoading = true;
      errorCode = null;
    });
    interstitialAd?.load();
  }

  void showAd() {
    if (isLoaded) {
      interstitialAd?.show();
    }
  }

  @override
  void dispose() {
    interstitialAd?.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Interstitial Ad Example'),
      ),
      body: SafeArea(
        child: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              // Load button
              ElevatedButton(
                onPressed: isLoading ? null : loadAd,
                child: Text(isLoading ? 'Loading...' : 'Load Ad'),
              ),
              const SizedBox(height: 16),

              // Show button
              ElevatedButton(
                onPressed: isLoaded ? showAd : null,
                child: const Text('Show Ad'),
              ),
              const SizedBox(height: 16),

              // Reset button
              TextButton(
                onPressed: (isShown || errorCode != null)
                    ? () => _createInterstitialAd()
                    : null,
                child: const Text('Reset'),
              ),
              const SizedBox(height: 24),

              // Status display
              Text('Loaded: ${isLoaded ? "Yes" : "No"}'),
              Text('Shown: ${isShown ? "Yes" : "No"}'),

              // Error display
              if (errorCode != null) ...[
                const SizedBox(height: 16),
                Text(
                  'Error: ${errorCode?.code}',
                  style: const TextStyle(color: Colors.red),
                ),
              ],
            ],
          ),
        ),
      ),
    );
  }
}

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Next Steps

Rewarded Ads

Implement rewarded ads that provide rewards

Popup Ads

Implement popup-style ads

Backfill Ads

Learn how to handle backfill ads

Reference

Reference types, methods, and error codes