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Network plugin handleOnResume throws ANR

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
58/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Quiet
Tech stack
java
Domain
mobile-dev, networking

Research direction

Start in network/android/src/main/java/com/capacitorjs/plugins/network/NetworkPlugin.java at handleOnResume and inspect Network.getNetworkStatus, especially the ConnectivityManager call shown in the ANR trace. Check how this plugin or repository dispatches background work before choosing an execution path. Done means resume handling no longer blocks the main thread while preserving the network-status behavior.

Written by the indexing model from the issue text.

Description

triage

The network plugin's handleOnResume calls getNetworkStatus from main thread, which can be a slow operation:
https://github.com/ionic-team/capacitor-plugins/blob/2be8127d580a847c832698169893079b3960b9f3/network/android/src/main/java/com/capacitorjs/plugins/network/NetworkPlugin.java#L60

I've seen a crashlytics report of an ANR thrown because of this:

android.os.BinderProxy.transactNative (Native method)
This Binder call may be taking too long, causing the main thread to wait, and triggering the ANR.
android.os.BinderProxy.transact (BinderProxy.java:659)
android.net.IConnectivityManager$Stub$Proxy.getActiveNetwork (IConnectivityManager.java:1798)
android.net.ConnectivityManager.getActiveNetwork (ConnectivityManager.java:1549)
com.capacitorjs.plugins.network.Network.getNetworkStatus (Network.java:77)
com.capacitorjs.plugins.network.NetworkPlugin.handleOnResume (NetworkPlugin.java:60)
com.getcapacitor.Bridge.onResume (Bridge.java:1347)
com.getcapacitor.BridgeActivity.onResume (BridgeActivity.java:98)
android.app.Instrumentation.callActivityOnResume (Instrumentation.java:1490)
android.app.Activity.performResume (Activity.java:8281)
android.app.ActivityThread.performResumeActivity (ActivityThread.java:4960)
android.app.ActivityThread.handleResumeActivity (ActivityThread.java:5018)
android.app.servertransaction.ResumeActivityItem.execute (ResumeActivityItem.java:60)
android.app.servertransaction.ActivityTransactionItem.execute (ActivityTransactionItem.java:45)
android.app.servertransaction.TransactionExecutor.executeLifecycleState (TransactionExecutor.java:176)
android.app.servertransaction.TransactionExecutor.execute (TransactionExecutor.java:97)
android.app.ActivityThread$H.handleMessage (ActivityThread.java:2374)
android.os.Handler.dispatchMessage (Handler.java:106)
android.os.Looper.loopOnce (Looper.java:233)
android.os.Looper.loop (Looper.java:344)
android.app.ActivityThread.main (ActivityThread.java:8249)
java.lang.reflect.Method.invoke (Native method)
com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:589)
com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1071)

Perhaps this call should make from a background thread like this?

@Override
public void handleOnResume() {
    super.handleOnResume();
    
    // Dispatch heavy operations off the Main thread
    CapacitorJS.getEngine().executeOnBackgroundThread(() -> {
        // Your background work here
    });
}
``
Dominant language
Java
Stars
682
Forks
689
Avg merge
5d 11h
Merged PRs (30d)
3

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