BannerAd.size retrieving only -1

Bug report

Describe the bug I am trying to retrieve the correct size of Banner but the methods BannerAd.size.height/width gives me the value -1.

Steps to reproduce

  static BannerAd _bannerAd;
  static Future<Widget> getBannerWidget({AdSize adSize}) async{

    _bannerAd = BannerAd(
      adUnitId: getBannerAdUnitId(),
      size: adSize ?? AdSize.smartBanner,
      request: _adRequest,
      listener: AdListener(
        // Called when an ad is successfully received.
        onAdLoaded: (Ad ad) {

          if(_debug){
            print('Ad loaded.');
          }

        },
        // Called when an ad request failed.
        onAdFailedToLoad: (Ad ad, LoadAdError error) {

          if(_debug){
            print('Ad failed to load: $error');
            _bannerAd.dispose();
          }

        },
        // Called when an ad opens an overlay that covers the screen.
        onAdOpened: (Ad ad) {

          if(_debug){
            print('Ad opened.');
          }

        },
        // Called when an ad removes an overlay that covers the screen.
        onAdClosed: (Ad ad) {

          if(_debug){
            print('Ad closed.');
          }

        },
        // Called when an ad is in the process of leaving the application.
        onApplicationExit: (Ad ad) {

          if(_debug){
            print('Left application.');
          }

        },
      ),
    );

    await _bannerAd.load();

    print("BANNER SIZE HEIGHT: ${_bannerAd.size.height}"); // -1
    print("BANNER SIZE WIDTH: ${_bannerAd.size.width}"); // -1

    return Container(
        child: AdWidget(ad: _bannerAd),
        height: _bannerAd.size.height,
        width: _bannerAd.size.width,
    );

  }

Expected behavior

Retrieve the correct size of the loaded banner.

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Additional context

Add any other context about the problem here.

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Flutter doctor

Run flutter doctor and paste the output below:

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[√] Flutter (Channel stable, 2.0.0, on Microsoft Windows [versão 10.0.19042.844], locale pt-BR)
[√] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
[√] Chrome - develop for the web
[√] Visual Studio - develop for Windows (Visual Studio Community 2019 16.8.5)
[√] Android Studio (version 4.1.0)
[√] VS Code (version 1.53.2)
[√] Connected device (4 available)

• No issues found!

---

Flutter dependencies

Run flutter pub deps -- --style=compact and paste the output below:

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Dart SDK 2.12.0
Flutter SDK 2.0.0
djalma_ads 0.2.8

dependencies:
- flutter 0.0.0 [characters collection meta typed_data vector_math sky_engine]
- google_mobile_ads 0.11.0+1 [meta flutter]

dev dependencies:
- flutter_test 0.0.0 [flutter test_api path fake_async clock stack_trace vector_math async boolean_selector characters charcode collection matcher meta source_s
pan stream_channel string_scanner term_glyph typed_data]

transitive dependencies:
- async 2.5.0 [collection]
- boolean_selector 2.1.0 [source_span string_scanner]
- characters 1.1.0
- charcode 1.2.0
- clock 1.1.0
- collection 1.15.0
- fake_async 1.2.0 [clock collection]
- matcher 0.12.10 [stack_trace]
- meta 1.3.0
- path 1.8.0
- sky_engine 0.0.99
- source_span 1.8.0 [charcode collection path term_glyph]
- stack_trace 1.10.0 [path]
- stream_channel 2.1.0 [async]
- string_scanner 1.1.0 [charcode source_span]
- term_glyph 1.2.0
- test_api 0.2.19 [async boolean_selector collection meta path source_span stack_trace stream_channel string_scanner term_glyph matcher]
- typed_data 1.3.0 [collection]
- vector_math 2.1.0

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[AnkitChowdhury]

If I may add to it, the problem is only occurring for SmartBanners. Other forms of banners are reporting the size values correctly.

[Purus]

Unable to use Smart Banners because of this issue.