HomeWidget.updateWidget not working on Android Release Mode

[th8m0z]

The widget is not being updated on release mode on Android, debug mode works perfectly.

Logs from Crashlytics show this error:

PlatformException(-3, No Widget found with Name null. Argument 'name' must be the same as your AppWidgetProvider you wish to update, java.lang.ClassNotFoundException: app.routineflow.routineflow.glance.HomeWidgetReceiver at java.lang.Class.classForName(Native Method) at java.lang.Class.forName(Class.java:536) at java.lang.Class.forName(Class.java:467) at es.antonborri.home_widget.a.onMethodCall(Unknown Source:522) at hh.j$a.a(Unknown Source:17) at wg.c.l(Unknown Source:18) at wg.c.m(Unknown Source:41) at wg.c.i(Unknown Source:0) at wg.b.run(Unknown Source:12) at android.os.Handler.handleCallback(Handler.java:1013) at android.os.Handler.dispatchMessage(Handler.java:101) at android.os.Looper.loopOnce(Looper.java:226) at android.os.Looper.loop(Looper.java:328) at android.app.ActivityThread.main(ActivityThread.java:9190) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:594) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099) Caused by: java.lang.ClassNotFoundException: app.routineflow.routineflow.glance.HomeWidgetReceiver ... 17 more , null)

[ABausG]

Can you try:

• Use the fully qualified Android Name (using the package import)
• Add your widget receiver class app.routineflow.routineflow.glance.HomeWidgetReceiver to the pro guard file so it can find the class even in a shrunk release build

[MakhmudovBekhruz]

The same issue, please help asap, it is very urgent now

[ABausG]

• Can you additionally provide the way you are calling HomeWidget.updateWidget
• Have you tried the steps I mentioned above?

[MakhmudovBekhruz]

@ABausG yes I tried those steps but it did not help. Profile and Debug mode are working fine. Problem only in release mode

Flutter version: 3.22.1

[ABausG]

Can you paste in your proguard.rules file?

You will then need to whitelist your AppReceiver in order for it to be found when the platform files get obfuscated

(Plus please your call to HomeWidget.updateWidget)

[dario-digregorio]

I had the same issue and could solve it by adding proguard rules.

add this to your app build.gradle

 buildTypes {
        release {
            // ...
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
         // ...
    }

and create a proguard-rules.pro file in the android/app directory. And add this line. Add exceptions for all files related to the widget implementation. In my case they are all inside the widget package/directory.

-keepclassmembers class my.flutter.app.widget.** { *; }

If you are not sure which rules to add you can upload your apk to this playground