TrafficStats reporting -1 for all applications except my own?

Issue

I run the following code on my device:

PackageManager packageManager = context.getPackageManager();
List<ApplicationInfo> applications = packageManager
        .getInstalledApplications(PackageManager.GET_META_DATA);
for (ApplicationInfo applicationInfo : applications) {
    Log.OUT.debug("NET_THRESHOLD: package = " + applicationInfo.packageName + ", uid = " + applicationInfo.uid + ", rx bytes: " + TrafficStats.getUidRxBytes(applicationInfo.uid));
}

And it seems to report -1 (or TrafficStats.UNSUPPORTED) for every package on my device except for the one I'm calling it from.

Is this intended behavior?

I'm running Android 10 if this makes a difference.

Solution

I just found this in the android documentation for TrafficStats#getUidRxBytes(int).

Starting in Build.VERSION_CODES.N this will only report traffic statistics for the calling UID. It will return UNSUPPORTED for all other UIDs for privacy reasons. To access historical network statistics belonging to other UIDs, use NetworkStatsManager.

Answered By - Nathan F.