[Android] Using `await MobileAds.instance.initialize()` the app fails to load

Plugin Version

google_mobile_ads: ^0.13.6

Steps to Reproduce

Create an app with async main

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await MobileAds.instance.initialize(); //get stuck on this line
  ..... it does not reach this line
}

Expected results: Do not get stuck the app. Yesterday my apps was working fine on the store. Today all apps do not open because of this problem. I did not make changes on my apps. Happens without any reason since yesterday. Solution was remove “await” word but I have to wait until my users update the apps.

Actual results: They get stuck on that line

Logs

[        ] executing: /Users/leonardo/Library/Android/sdk/platform-tools/adb -s emulator-5554 shell am force-stop com.novenayvillancicos.santorosariocatolico
[  +56 ms] executing: /Users/leonardo/Library/Android/sdk/platform-tools/adb -s emulator-5554 shell pm list packages com.novenayvillancicos.santorosariocatolico
[  +58 ms] package:com.novenayvillancicos.santorosariocatolico
[   +1 ms] executing: /Users/leonardo/Library/Android/sdk/platform-tools/adb -s emulator-5554 shell cat /data/local/tmp/sky.com.novenayvillancicos.santorosariocatolico.sha1
[  +42 ms] ce716c55c6c4bcb0ffc9f7ccce084b4aeff393b7
[        ] Installing APK.
[   +1 ms] Installing build/app/outputs/flutter-apk/app.apk...
[        ] executing: /Users/leonardo/Library/Android/sdk/platform-tools/adb -s emulator-5554 install -t -r /Users/leonardo/Development/flutter/git/santorosario_flutter/build/app/outputs/flutter-apk/app.apk
[+1250 ms] Performing Streamed Install
                    Success
[   +1 ms] Installing build/app/outputs/flutter-apk/app.apk... (completed in 1,250ms)
[   +1 ms] executing: /Users/leonardo/Library/Android/sdk/platform-tools/adb -s emulator-5554 shell echo -n 6a4bf369167aa3e6ab1860e2a748efe7eeae6eb4 > /data/local/tmp/sky.com.novenayvillancicos.santorosariocatolico.sha1
[  +33 ms] executing: /Users/leonardo/Library/Android/sdk/platform-tools/adb -s emulator-5554 shell -x logcat -v time -t 1
[ +318 ms] --------- beginning of system
                    11-10 13:25:45.883 D/CompatibilityChangeReporter(  508): Compat change id reported: 143937733; UID 10102; state: ENABLED
[   +9 ms] executing: /Users/leonardo/Library/Android/sdk/platform-tools/adb -s emulator-5554 shell am start -a android.intent.action.RUN -f 0x20000000 --ez enable-background-compilation true --ez enable-dart-profiling true --ez
enable-checked-mode true --ez verify-entry-points true com.novenayvillancicos.santorosariocatolico/com.novenayvillancicos.santorosariocatolico.MainActivity
[ +301 ms] Starting: Intent { act=android.intent.action.RUN flg=0x20000000 cmp=com.novenayvillancicos.santorosariocatolico/.MainActivity (has extras) }
[        ] Waiting for observatory port to be available...
[+3144 ms] Observatory URL on device: http://127.0.0.1:33313/DN2bSKCOYxE=/
[        ] executing: /Users/leonardo/Library/Android/sdk/platform-tools/adb -s emulator-5554 forward tcp:0 tcp:33313
[  +15 ms] 51881
[        ] Forwarded host port 51881 to device port 33313 for Observatory
[   +4 ms] Caching compiled dill
[  +47 ms] Connecting to service protocol: http://127.0.0.1:51881/DN2bSKCOYxE=/
[   +9 ms] W/FlutterActivityAndFragmentDelegate(19079): A splash screen was provided to Flutter, but this is deprecated. See flutter.dev/go/android-splash-migration for migration steps.
[ +364 ms] Launching a Dart Developer Service (DDS) instance at http://127.0.0.1:0, connecting to VM service at http://127.0.0.1:51881/DN2bSKCOYxE=/.
[ +211 ms] DDS is listening at http://127.0.0.1:51886/nJNYcB3Dt-8=/.
[  +52 ms] Successfully connected to service protocol: http://127.0.0.1:51881/DN2bSKCOYxE=/
[ +180 ms] DevFS: Creating new filesystem on the device (null)
[  +45 ms] DevFS: Created new filesystem on the device (file:///data/user/0/com.novenayvillancicos.santorosariocatolico/code_cache/santorosario_flutterCYKVCP/santorosario_flutter/)
[   +1 ms] Updating assets
[ +197 ms] Manifest contained wildcard assets. Inserting missing file into build graph to force rerun. for more information see #56466.
[   +7 ms] Syncing files to device sdk gphone x86...
[   +1 ms] <- reset
[        ] Compiling dart to kernel with 0 updated files
[   +5 ms] <- recompile package:santorosariocatolico/main.dart 838c752f-e9c7-4db8-94e4-a9af77ccb0a5
[        ] <- 838c752f-e9c7-4db8-94e4-a9af77ccb0a5
[ +204 ms] Updating files.
[        ] DevFS: Sync finished
[        ] Syncing files to device sdk gphone x86... (completed in 213ms)
[        ] Synced 0.0MB.
[   +2 ms] <- accept
[   +6 ms] Connected to _flutterView/0xf6a42c20.
[   +3 ms] Flutter run key commands.
[   +2 ms] r Hot reload. 🔥🔥🔥
[        ] R Hot restart.
[        ] h List all available interactive commands.
[        ] d Detach (terminate "flutter run" but leave application running).
[        ] c Clear the screen
[        ] q Quit (terminate the application on the device).
[        ] 💪 Running with sound null safety 💪
[   +1 ms] An Observatory debugger and profiler on sdk gphone x86 is available at: http://127.0.0.1:51886/nJNYcB3Dt-8=/
[  +77 ms] DevTools activation throttled until 2021-11-10 19:43:08.550687.
[ +255 ms] I/rosariocatolic(19079): Background concurrent copying GC freed 119636(6210KB) AllocSpace objects, 40(1612KB) LOS objects, 49% free, 5501KB/10MB, paused 1.393ms total 164.964ms
[  +38 ms] I/rosariocatolic(19079): The ClassLoaderContext is a special shared library.
[ +110 ms] I/chatty  (19079): uid=10154(com.novenayvillancicos.santorosariocatolico) identical 1 line
[        ] I/rosariocatolic(19079): The ClassLoaderContext is a special shared library.
[        ] I/DynamiteModule(19079): Considering local module com.google.android.gms.ads.dynamite:0 and remote module com.google.android.gms.ads.dynamite:213806100
[        ] I/DynamiteModule(19079): Selected remote version of com.google.android.gms.ads.dynamite, version >= 213806100
[   +2 ms] D/DynamitePackage(19079): Instantiated singleton DynamitePackage.
[   +1 ms] D/DynamitePackage(19079): Instantiating com.google.android.gms.ads.ChimeraMobileAdsSettingManagerCreatorImpl
[  +92 ms] W/ConnectionStatusConfig(19079): Dynamic lookup for intent failed for action: com.google.android.gms.leibniz.events.service.START
[        ] W/GmsClient(19079): unable to connect to service: com.google.android.gms.leibniz.events.service.START on com.google.android.gms
[  +60 ms] I/WebViewFactory(19079): Loading com.google.android.webview version 83.0.4103.106 (code 410410681)
[   +2 ms] The Flutter DevTools debugger and profiler on sdk gphone x86 is available at: http://127.0.0.1:9101?uri=http://127.0.0.1:51886/nJNYcB3Dt-8=/
[   +1 ms] I/rosariocatolic(19079): The ClassLoaderContext is a special shared library.
[        ] D/nativeloader(19079): classloader namespace configured for unbundled product apk.
library_path=/product/app/WebViewGoogle/lib/x86:/product/app/WebViewGoogle/WebViewGoogle.apk!/lib/x86:/product/app/TrichromeLibrary/TrichromeLibrary.apk!/lib/x86:/product/lib:/system/product/lib
[  +23 ms] I/rosariocatolic(19079): The ClassLoaderContext is a special shared library.
[        ] D/nativeloader(19079): classloader namespace configured for unbundled product apk.
library_path=/product/app/WebViewGoogle/lib/x86:/product/app/WebViewGoogle/WebViewGoogle.apk!/lib/x86:/product/app/TrichromeLibrary/TrichromeLibrary.apk!/lib/x86:/product/lib:/system/product/lib
[  +73 ms] I/cr_LibraryLoader(19079): Loaded native library version number "83.0.4103.106"
[        ] I/cr_CachingUmaRecorder(19079): Flushed 3 samples from 3 histograms.
[ +266 ms] W/rosariocatolic(19079): Accessing hidden method Landroid/media/AudioManager;->getOutputLatency(I)I (greylist, reflection, allowed)
[   +9 ms] W/cr_media(19079): Requires BLUETOOTH permission
[   +5 ms] D/HostConnection(19079): HostConnection::get() New Host Connection established 0xf6a26730, tid 19424
[  +46 ms] D/HostConnection(19079): HostComposition ext ANDROID_EMU_CHECKSUM_HELPER_v1 ANDROID_EMU_native_sync_v2 ANDROID_EMU_native_sync_v3 ANDROID_EMU_native_sync_v4 ANDROID_EMU_dma_v1 ANDROID_EMU_direct_mem ANDROID_EMU_host_composition_v1
ANDROID_EMU_host_composition_v2 ANDROID_EMU_YUV_Cache ANDROID_EMU_async_unmap_buffer ANDROID_EMU_has_shared_slots_host_memory_allocator ANDROID_EMU_sync_buffer_data ANDROID_EMU_read_color_buffer_dma GL_OES_EGL_image_external_essl3
GL_OES_vertex_array_object GL_KHR_texture_compression_astc_ldr ANDROID_EMU_host_side_tracing ANDROID_EMU_async_frame_commands ANDROID_EMU_gles_max_version_3_0 
[   +4 ms] D/EGL_emulation(19079): eglCreateContext: 0xf6a16510: maj 3 min 0 rcv 3
[   +3 ms] D/EGL_emulation(19079): eglMakeCurrent: 0xf6a16510: ver 3 0 (tinfo 0xc1aa9f70) (first time)
[   +3 ms] I/rosariocatolic(19079): Waiting for a blocking GC ProfileSaver
[ +200 ms] I/VideoCapabilities(19079): Unsupported profile 4 for video/mp4v-es
[        ] W/cr_MediaCodecUtil(19079): HW encoder for video/avc is not available on this device.
[  +19 ms] D/EGL_emulation(19079): eglCreateContext: 0xf6a283a0: maj 3 min 0 rcv 3

[✓] Flutter (Channel stable, 2.5.3, on macOS 12.0.1 21A559 darwin-x64, locale es-419)
[✓] Android toolchain - develop for Android devices (Android SDK version 31.0.0-rc4)
[✓] Xcode - develop for iOS and macOS
[✓] Chrome - develop for the web
[✓] Android Studio (version 2020.3)
[✓] VS Code (version 1.62.1)
[✓] Connected device (4 available)

• No issues found!

[pmmdz]

We’re having the same issue. It seems that underlying MobileAds#initialize invocation never returns async result.

The issue happens on Android devices and emulators, builds for iOS do not have this problem.

[hukusuke1007]

same issue

Fatal Exception: java.lang.LinkageError: Method java.lang.Object com.google.android.gms.internal.ads.jo3.zzb() overrides final method in class Lcom/google/android/gms/internal/ads/bo3; (declaration of 'com.google.android.gms.internal.ads.jo3' appears in base.apk)
       at com.google.android.gms.internal.ads.zzcpq.zza(zzcpq.java:44)
       at com.google.android.gms.internal.ads.zzevk.zza(zzevk.java:365)
       at com.google.android.gms.internal.ads.zzeke.zzN(zzeke.java:58)
       at com.google.android.gms.internal.ads.zzeke.zze(zzeke.java:6)
       at com.google.android.gms.internal.ads.zzbhd.zzg(zzbhd.java:203)
       at com.google.android.gms.ads.BaseAdView.loadAd(BaseAdView.java:6)
       at io.flutter.plugins.googlemobileads.FlutterBannerAd.load(FlutterBannerAd.java:60)
       at io.flutter.plugins.googlemobileads.GoogleMobileAdsPlugin.onMethodCall(GoogleMobileAdsPlugin.java:737)
       at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:17)
       at io.flutter.embedding.engine.dart.DartMessenger.handleMessageFromDart(DartMessenger.java:49)
       at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessage(FlutterJNI.java:4)
       at android.os.MessageQueue.nativePollOnce(MessageQueue.java)
       at android.os.MessageQueue.next(MessageQueue.java:326)
       at android.os.Looper.loop(Looper.java:160)
       at android.app.ActivityThread.main(ActivityThread.java:6894)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:883)