Filters out too frequent "network down" notifications on Android. Fixes exception when trying to load not supported native library on Android.

src/net/java/sip/communicator/impl/sysactivity/SystemActivityNotifications.java

@@ -99,11 +99,15 @@ public class SystemActivityNotifications
     {
         try
         {
-            System.loadLibrary("sysactivitynotifications");
-
-            ptr = allocAndInit();
-            if (ptr == -1)
-                ptr = 0;
+            // Don't load native library on Android to prevent the exception
+            if(!org.jitsi.util.OSUtils.IS_ANDROID)
+            {
+                System.loadLibrary("sysactivitynotifications");
+
+                ptr = allocAndInit();
+                if (ptr == -1)
+                    ptr = 0;
+            }
         }
         catch (Throwable t)
         {

src/net/java/sip/communicator/plugin/reconnectplugin/ReconnectPluginActivator.java

@@ -173,6 +173,17 @@ public class ReconnectPluginActivator
         "net.java.sip.communicator.plugin.reconnectplugin." +
             "ATLEAST_ONE_SUCCESSFUL_CONNECTION";
 
+    /**
+     * Timer used to filter out too frequent "network down" notifications
+     * on Android.
+     */
+    private Timer delayedNetworkDown;
+
+    /**
+     * Delay used for filtering out "network down" notifications.
+     */
+    private static final long NETWORK_DOWN_THRESHOLD = 30 * 1000;
+
     /**
      * Starts this bundle.
      *
@@ -453,6 +464,8 @@ public synchronized void configurationChanged(ChangeEvent event)
             // no connection so one is up, lets connect
             if(connectedInterfaces.isEmpty())
             {
+                onNetworkUp();
+
                 Iterator<ProtocolProviderService> iter =
                     needsReconnection.iterator();
                 while (iter.hasNext())
@@ -532,10 +545,7 @@ else if(event.getType() == ChangeEvent.IFACE_DOWN)
 
                 connectedInterfaces.clear();
 
-                if (logger.isTraceEnabled())
-                    logger.trace("Network is down!");
-                notify("", "plugin.reconnectplugin.NETWORK_DOWN",
-                       new String[0], this);
+                onNetworkDown();
             }
         }
 
@@ -978,4 +988,58 @@ private void setAtLeastOneSuccessfulConnection(
             + pp.getAccountID().getAccountUniqueID(),
            Boolean.valueOf(value).toString());
     }
+
+    /**
+     * Called when first connected interface is added to
+     * {@link #connectedInterfaces} list.
+     */
+    private void onNetworkUp()
+    {
+        if(delayedNetworkDown != null)
+        {
+            delayedNetworkDown.cancel();
+            delayedNetworkDown = null;
+        }
+    }
+
+    /**
+     * Called when first there are no more connected interface present in
+     * {@link #connectedInterfaces} list.
+     */
+    private void onNetworkDown()
+    {
+        if(!org.jitsi.util.OSUtils.IS_ANDROID)
+        {
+            notifyNetworkDown();
+        }
+        else
+        {
+            // Android never keeps two active connection at the same time
+            // and it may take some time to attach next connection
+            // even if it was already enabled by user
+            if(delayedNetworkDown == null)
+            {
+                delayedNetworkDown = new Timer();
+                delayedNetworkDown.schedule(new TimerTask()
+                {
+                    @Override
+                    public void run()
+                    {
+                        notifyNetworkDown();
+                    }
+                }, NETWORK_DOWN_THRESHOLD);
+            }
+        }
+    }
+
+    /**
+     * Posts "network is down" notification.
+     */
+    private void notifyNetworkDown()
+    {
+        if (logger.isTraceEnabled())
+            logger.trace("Network is down!");
+        notify("", "plugin.reconnectplugin.NETWORK_DOWN",
+               new String[0], this);
+    }
 }

src/net/java/sip/communicator/plugin/reconnectplugin/reconnectplugin.manifest.mf

@@ -13,5 +13,6 @@ Import-Package: org.osgi.framework,
  net.java.sip.communicator.service.protocol,
  net.java.sip.communicator.service.protocol.event,
  org.jitsi.service.resources, net.java.sip.communicator.service.resources,
+ org.jitsi.util,
  net.java.sip.communicator.util,
  net.java.sip.communicator.plugin.desktoputil