fix(android): count native listeners / correctly disable listener if …

…count == 0 (#569)

android/src/main/java/com/reactnativecommunity/netinfo/NetInfoModule.java

@@ -21,6 +21,8 @@ public class NetInfoModule extends ReactContextBaseJavaModule implements AmazonF
     private final ConnectivityReceiver mConnectivityReceiver;
     private final AmazonFireDeviceConnectivityPoller mAmazonConnectivityChecker;
 
+    private int numberOfListeners = 0;
+
     public NetInfoModule(ReactApplicationContext reactContext) {
         super(reactContext);
         // Create the connectivity receiver based on the API level we are running on
@@ -63,14 +65,14 @@ public void onAmazonFireDeviceConnectivityChanged(boolean isConnected) {
 
     @ReactMethod
     public void addListener(String eventName) {
-        // Keep: Required for RN built in Event Emitter Calls.
+        numberOfListeners++;
         mConnectivityReceiver.hasListener = true;
     }
 
     @ReactMethod
     public void removeListeners(Integer count) {
-        // Keep: Required for RN built in Event Emitter Calls.
-        if (count == 0) {
+        numberOfListeners -= count;
+        if (numberOfListeners == 0) {
             mConnectivityReceiver.hasListener = false;
         }
     }