Final commit

All changes included

Improvements

-Reformatted code wherever required
-Only active wifi connections trigger events
-Improve sync reliability
-Removed extra permission

Minor Changes

-Refactored 2 variables for easier readbility
-Wifi-Only-Sync is now enabled by default

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/receiver/NetworkReceiver.java

@@ -0,0 +1,52 @@
+package org.sufficientlysecure.keychain.receiver;
+
+import android.content.BroadcastReceiver;
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.net.ConnectivityManager;
+import android.net.NetworkInfo;
+
+import org.sufficientlysecure.keychain.Constants;
+import org.sufficientlysecure.keychain.service.KeyserverSyncAdapterService;
+import org.sufficientlysecure.keychain.util.Log;
+
+public class NetworkReceiver extends BroadcastReceiver {
+
+    @Override
+    public void onReceive(Context context, Intent intent) {
+
+        ConnectivityManager conn = (ConnectivityManager)
+                context.getSystemService(Context.CONNECTIVITY_SERVICE);
+        NetworkInfo networkInfo = conn.getActiveNetworkInfo();
+        boolean isTypeWifi = (networkInfo.getType() == ConnectivityManager.TYPE_WIFI);
+        boolean isConnected = networkInfo.isConnected();
+
+        if (isTypeWifi && isConnected) {
+
+            // broadcaster receiver disabled
+            setWifiReceiverComponent(false, context);
+            Intent serviceIntent = new Intent(context, KeyserverSyncAdapterService.class);
+            serviceIntent.setAction(KeyserverSyncAdapterService.ACTION_SYNC_NOW);
+            context.startService(serviceIntent);
+        }
+    }
+
+    public void setWifiReceiverComponent(Boolean isEnabled, Context context) {
+
+        PackageManager pm = context.getPackageManager();
+        ComponentName compName = new ComponentName(context,
+                NetworkReceiver.class);
+
+        if (isEnabled) {
+            pm.setComponentEnabledSetting(compName,
+                    PackageManager.COMPONENT_ENABLED_STATE_ENABLED, PackageManager.DONT_KILL_APP);
+            Log.d(Constants.TAG, "Wifi Receiver is enabled!");
+        } else {
+            pm.setComponentEnabledSetting(compName,
+                    PackageManager.COMPONENT_ENABLED_STATE_DISABLED, PackageManager.DONT_KILL_APP);
+            Log.d(Constants.TAG, "Wifi Receiver is disabled!");
+        }
+    }
+}