Remove passing Android context to NetworkMonitor.

Instead NetworkMonitor calls ContextUtils.getApplicationContext when needed.

Bug: webrtc:7730
Change-Id: I312781da4222f7107ea1bf57099f17709fec2385
Reviewed-on: https://chromium-review.googlesource.com/517792
Commit-Queue: Sami Kalliomäki <sakal@webrtc.org>
Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#18382}

webrtc/sdk/android/api/org/webrtc/NetworkMonitor.java

@@ -39,9 +39,7 @@ public class NetworkMonitor {
   private static final String TAG = "NetworkMonitor";
 
   // We are storing application context so it is okay.
-  @SuppressLint("StaticFieldLeak") private static NetworkMonitor instance;
-
-  private final Context applicationContext;
+  private static NetworkMonitor instance;
 
   // Native observers of the connection type changes.
   private final ArrayList<Long> nativeNetworkObservers;
@@ -53,33 +51,22 @@ public class NetworkMonitor {
 
   private ConnectionType currentConnectionType = ConnectionType.CONNECTION_UNKNOWN;
 
-  private NetworkMonitor(Context context) {
-    assertIsTrue(context != null);
-    applicationContext = context.getApplicationContext();
-
+  private NetworkMonitor() {
     nativeNetworkObservers = new ArrayList<Long>();
     networkObservers = new ArrayList<NetworkObserver>();
   }
 
-  /**
-   * Initializes the singleton once.
-   * Called from the native code.
-   */
-  public static NetworkMonitor init(Context context) {
-    if (!isInitialized()) {
-      instance = new NetworkMonitor(context);
-    }
-    return instance;
-  }
-
-  public static boolean isInitialized() {
-    return instance != null;
-  }
+  // TODO(sakal): Remove once downstream dependencies have been updated.
+  @Deprecated
+  public static void init(Context context) {}
 
   /**
    * Returns the singleton instance.
    */
   public static NetworkMonitor getInstance() {
+    if (instance == null) {
+      instance = new NetworkMonitor();
+    }
     return instance;
   }
 
@@ -163,7 +150,7 @@ public class NetworkMonitor {
         public void onNetworkDisconnect(long networkHandle) {
           notifyObserversOfNetworkDisconnect(networkHandle);
         }
-      }, applicationContext);
+      }, ContextUtils.getApplicationContext());
       final NetworkMonitorAutoDetect.NetworkState networkState =
           autoDetector.getCurrentNetworkState();
       updateCurrentConnectionType(NetworkMonitorAutoDetect.getConnectionType(networkState));
@@ -250,8 +237,8 @@ public class NetworkMonitor {
       long nativePtr, NetworkInformation[] networkInfos);
 
   // For testing only.
-  static void resetInstanceForTests(Context context) {
-    instance = new NetworkMonitor(context);
+  static void resetInstanceForTests() {
+    instance = new NetworkMonitor();
   }
 
   // For testing only.

webrtc/sdk/android/instrumentationtests/src/org/webrtc/NetworkMonitorTest.java

@@ -161,7 +161,7 @@ public class NetworkMonitorTest {
    */
   private void createTestMonitor() {
     Context context = InstrumentationRegistry.getTargetContext();
-    NetworkMonitor.resetInstanceForTests(context);
+    NetworkMonitor.resetInstanceForTests();
     NetworkMonitor.setAutoDetectConnectivityState(true);
     receiver = NetworkMonitor.getAutoDetectorForTest();
     assertNotNull(receiver);
@@ -182,6 +182,7 @@ public class NetworkMonitorTest {
 
   @Before
   public void setUp() {
+    ContextUtils.initialize(InstrumentationRegistry.getTargetContext());
     createTestMonitor();
   }
 

webrtc/sdk/android/src/jni/androidnetworkmonitor_jni.cc

@@ -27,7 +27,6 @@ enum AndroidSdkVersion {
   SDK_VERSION_MARSHMALLOW = 23
 };
 
-jobject AndroidNetworkMonitor::application_context_ = nullptr;
 int AndroidNetworkMonitor::android_sdk_int_ = 0;
 
 static NetworkType GetNetworkTypeFromJava(JNIEnv* jni, jobject j_network_type) {
@@ -163,14 +162,6 @@ std::string NetworkInformation::ToString() const {
   return ss.str();
 }
 
-// static
-void AndroidNetworkMonitor::SetAndroidContext(JNIEnv* jni, jobject context) {
-  if (application_context_) {
-    jni->DeleteGlobalRef(application_context_);
-  }
-  application_context_ = NewGlobalRef(jni, context);
-}
-
 AndroidNetworkMonitor::AndroidNetworkMonitor()
     : j_network_monitor_class_(jni(),
                                FindClass(jni(), "org/webrtc/NetworkMonitor")),
@@ -178,13 +169,10 @@ AndroidNetworkMonitor::AndroidNetworkMonitor()
           jni(),
           jni()->CallStaticObjectMethod(
               *j_network_monitor_class_,
-              GetStaticMethodID(
-                  jni(),
+              GetStaticMethodID(jni(),
                                 *j_network_monitor_class_,
-                  "init",
-                  "(Landroid/content/Context;)Lorg/webrtc/NetworkMonitor;"),
-              application_context_)) {
-  RTC_DCHECK(application_context_ != nullptr);
+                                "getInstance",
+                                "()Lorg/webrtc/NetworkMonitor;"))) {
   CHECK_EXCEPTION(jni()) << "Error during NetworkMonitor.init";
   if (android_sdk_int_ <= 0) {
     jmethodID m = GetStaticMethodID(jni(), *j_network_monitor_class_,

webrtc/sdk/android/src/jni/androidnetworkmonitor_jni.h

@@ -53,7 +53,8 @@ class AndroidNetworkMonitor : public rtc::NetworkMonitorBase,
  public:
   AndroidNetworkMonitor();
 
-  static void SetAndroidContext(JNIEnv* jni, jobject context);
+  // TODO(sakal): Remove once down stream dependencies have been updated.
+  static void SetAndroidContext(JNIEnv* jni, jobject context) {}
 
   void Start() override;
   void Stop() override;

webrtc/sdk/android/src/jni/peerconnection_jni.cc

@@ -1145,7 +1145,6 @@ JOW(void, PeerConnectionFactory_nativeInitializeAndroidGlobals)
  jobject context,
  jboolean video_hw_acceleration) {
   video_hw_acceleration_enabled = video_hw_acceleration;
-  AndroidNetworkMonitor::SetAndroidContext(jni, context);
   if (!factory_static_initialized) {
     RTC_DCHECK(j_application_context == nullptr);
     j_application_context = NewGlobalRef(jni, context);