Integration

sentry-android

Build System

Gradle

AGP Version

5.9.0

Proguard

Enabled

Version

8.19.0, 8.20.0

Steps to Reproduce

1. Create Android app

2. Run sentry-wizard

3. Add beforeBreadcrumb callback

    options.beforeBreadcrumb = SentryOptions.BeforeBreadcrumbCallback { crumb, hint ->
        Log.d("MainActivity", "[${Thread.currentThread().name}] BREADCRUMB: message=${crumb.message}, type=${crumb.type}, level=${crumb.level}, category=${crumb.category}, action=${crumb.getData("action")}")
        crumb
   }

4. Trigger network changes (e.g. adb shell svc wifi enable/disable)

5. Observe thread ID and name in the logcat output

   2025-09-05 10:57:04.116  7369-7450  MainActivity            com.example.sentryandroidapp         D  [ConnectivityThread] BREADCRUMB: message=null, type=system, level=INFO, category=network.event, action=NETWORK_AVAILABLE
   2025-09-05 10:57:04.119  7369-7450  MainActivity            com.example.sentryandroidapp         D  [ConnectivityThread] BREADCRUMB: message=null, type=system, level=INFO, category=network.event, action=NETWORK_CAPABILITIES_CHANGED
   

Expected Result

For network breadcrumbs, beforeBreadcrumb is called in the main thread, not in Android's ConnectivityThread. Is it possible to use ConnectivityManager.registerDefaultNetworkCallback(NetworkCallback, Handler) ^[API26+] together with MainLooperHandler Looper.myLooper?

Actual Result

The network callback is registered without specifying a handler:

This causes beforeBreadcrumb to be called in Android's internal ConnectivityThread that downstream SDKs are not aware of, causing random hard-to-reproduce crashes down the line:

• NETWORK_CAPABILITIES_CHANGED and BATTERY_CHANGED events on Android (with Maui) causing SIGSEGV Segfault sentry-dotnet#3828