Fix testRegisterUsageCallback failure in setUp

LocalServices.addService in NetworkStatsService is currently failing
with IllegalStateException "Overriding service registration". Setting up
LocalServices in the test to avoid this issue might be possible, but
moving the registration to the only non-test caller of that constructor
as done here solves the issue and avoids side-effects from a constructor.

Test: atest FrameworksNetTests does not choke on this test
Bug: b/78487385
Bug: b/80082746
Change-Id: I5dba98fc79aec0800c8b71e6c7e23d1cfbcae852
Merged-In: I884a7a8bd7db3fcd220b785ba9914ac8c77720f0
(Clean cherry-pick of go/ag/4061255)

2 files changed, 5 insertions, 3 deletions

diff --git a/services/core/java/com/android/server/net/NetworkStatsService.java b/services/core/java/com/android/server/net/NetworkStatsService.java
index aba75ddb4555..60e9eaab5721 100644
--- a/services/core/java/com/android/server/net/NetworkStatsService.java
+++ b/services/core/java/com/android/server/net/NetworkStatsService.java
@@ -324,6 +324,7 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
                 wakeLock, getDefaultClock(), TelephonyManager.getDefault(),
                 new DefaultNetworkStatsSettings(context), new NetworkStatsObservers(),
                 getDefaultSystemDir(), getDefaultBaseDir());
+        service.registerLocalService();
 
         HandlerThread handlerThread = new HandlerThread(TAG);
         Handler.Callback callback = new HandlerCallback(service);
@@ -333,6 +334,8 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
         return service;
     }
 
+    // This must not be called outside of tests, even within the same package, as this constructor
+    // does not register the local service. Use the create() helper above.
     @VisibleForTesting
     NetworkStatsService(Context context, INetworkManagementService networkManager,
             AlarmManager alarmManager, PowerManager.WakeLock wakeLock, Clock clock,
@@ -349,7 +352,9 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
         mSystemDir = checkNotNull(systemDir, "missing systemDir");
         mBaseDir = checkNotNull(baseDir, "missing baseDir");
         mUseBpfTrafficStats = new File("/sys/fs/bpf/traffic_uid_stats_map").exists();
+    }
 
+    private void registerLocalService() {
         LocalServices.addService(NetworkStatsManagerInternal.class,
                 new NetworkStatsManagerInternalImpl());
     }
diff --git a/tests/net/java/com/android/server/net/NetworkStatsServiceTest.java b/tests/net/java/com/android/server/net/NetworkStatsServiceTest.java
index 280e4c234e03..f89f303a1345 100644
--- a/tests/net/java/com/android/server/net/NetworkStatsServiceTest.java
+++ b/tests/net/java/com/android/server/net/NetworkStatsServiceTest.java
@@ -227,9 +227,6 @@ public class NetworkStatsServiceTest {
 
     @After
     public void tearDown() throws Exception {
-        // Registered by NetworkStatsService's constructor.
-        LocalServices.removeServiceForTest(NetworkStatsManagerInternal.class);
-
         IoUtils.deleteContents(mStatsDir);
 
         mServiceContext = null;