UPDATE
I'm noticing that I actually am receiving the NETWORK_LOGS_AVAILABLE
intent! The problem is, it's taking a very long time (over an hour?) to receive it.
Is there any known way to increase the frequency of receiving these events?
Original Question
I am trying to process DNS events that can now be read after receiving the onNetworkLogsAvailable
intent in a DeviceAdminReceiver application. This functionality was made available as of Android 8.0.
For some reason, I am never receiving this intent, even though I am successfully calling the setNetworkLoggingEnabled
method. Upon admin being enabled, I am receiving the ACTION_DEVICE_ADMIN_ENABLED
event, but nothing else after that.
Here's where I enable network logging:
public class NetworkAdminReceiver extends DeviceAdminReceiver {
@Override
public void onEnabled(Context context, Intent intent) {
DevicePolicyManager manager =
(DevicePolicyManager) context.getSystemService(Context.DEVICE_POLICY_SERVICE);
if ( manager == null )
{
throw new IllegalStateException("Unable to get DevicePolicyManager");
}
if (manager.isDeviceOwnerApp(context.getPackageName())) {
manager.setNetworkLoggingEnabled(getWho(context), true);
}
else
{
Toast.makeText(context, "This application is not device owner. DNS logging only works" +
" when this application is setup as the Device Owner", Toast.LENGTH_LONG).show();
}
}
// *snip* rest of class
}
Although I am not sure whether it's required (cannot find in documentation), I've also added the NETWORK_LOGS_AVAILABLE
intent action to the receiver's filter:
<receiver android:name=".admin.NetworkAdminReceiver"
android:label="@string/device_admin"
android:description="@string/device_admin_description"
android:permission="android.permission.BIND_DEVICE_ADMIN">
<meta-data android:name="android.app.device_admin"
android:resource="@xml/device_admin" />
<intent-filter>
<action android:name="android.app.action.DEVICE_ADMIN_ENABLED"/>
<action android:name="android.app.action.NETWORK_LOGS_AVAILABLE"/>
</intent-filter>
</receiver>
The application is marked as the device owner, network logging is enabled, and yet I never receive the intent. The only explanation I could think of is that network logs do not become available very frequently, but I could find no documentation supporting this theory.
I am also currently only testing this in the emulator. I am unsure if that would have an effect on this, though I cannot see how it would.
Is there anything that I am missing in order to properly receive the network logs via the DeviceAdminReceiver
?
I'm afraid there's no elegant solution.
This limitation looks like it was made intentionally. As you can see in the sources, the event is triggered when hard-coded thresholds are reached. It's either 1200 events or 1.5H timeout, whichever comes first. I did not manage to find any usable hooks in the
NetworkLogger
. They definitely did not want users to meddle with it.The only option I see is to use reflection to get access to the hidden API. The most straightforward, IMHO, is to get a handle to the
IIpConnectivityMetrics
service and use it to subscribe to the network events. I did not test this solution myself, though.