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/service/ContactSyncAdapterService.java

@@ -144,12 +144,13 @@ public class ContactSyncAdapterService extends Service {
 
     public static void requestContactsSync() {
         // if user has disabled automatic sync, do nothing
-        if (!ContentResolver.getSyncAutomatically(
-                new Account(Constants.ACCOUNT_NAME, Constants.ACCOUNT_TYPE),
-                ContactsContract.AUTHORITY)) {
+        boolean isSyncEnabled = ContentResolver.getSyncAutomatically(new Account
+                (Constants.ACCOUNT_NAME, Constants.ACCOUNT_TYPE), ContactsContract.AUTHORITY);
+
+        if (!isSyncEnabled) {
             return;
         }
-        
+
         Bundle extras = new Bundle();
         // no need to wait, do it immediately
         extras.putBoolean(ContentResolver.SYNC_EXTRAS_MANUAL, true);

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/KeyserverSyncAdapterService.java

@@ -16,6 +16,8 @@ import android.database.Cursor;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
 import android.graphics.drawable.Drawable;
+import android.net.ConnectivityManager;
+import android.net.NetworkInfo;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.Handler;
@@ -35,6 +37,7 @@ import org.sufficientlysecure.keychain.operations.results.ImportKeyResult;
 import org.sufficientlysecure.keychain.operations.results.OperationResult;
 import org.sufficientlysecure.keychain.provider.KeychainContract;
 import org.sufficientlysecure.keychain.provider.ProviderHelper;
+import org.sufficientlysecure.keychain.receiver.NetworkReceiver;
 import org.sufficientlysecure.keychain.service.input.CryptoInputParcel;
 import org.sufficientlysecure.keychain.ui.OrbotRequiredDialogActivity;
 import org.sufficientlysecure.keychain.ui.util.KeyFormattingUtils;
@@ -68,7 +71,7 @@ public class KeyserverSyncAdapterService extends Service {
 
     private static final String ACTION_IGNORE_TOR = "ignore_tor";
     private static final String ACTION_UPDATE_ALL = "update_all";
-    private static final String ACTION_SYNC_NOW = "sync_now";
+    public static final String ACTION_SYNC_NOW = "sync_now";
     private static final String ACTION_DISMISS_NOTIFICATION = "cancel_sync";
     private static final String ACTION_START_ORBOT = "start_orbot";
     private static final String ACTION_CANCEL = "cancel";
@@ -176,8 +179,25 @@ public class KeyserverSyncAdapterService extends Service {
         @Override
         public void onPerformSync(Account account, Bundle extras, String authority,
                                   ContentProviderClient provider, SyncResult syncResult) {
-            Log.d(Constants.TAG, "Performing a keyserver sync!");
 
+            Preferences prefs = Preferences.getPreferences(getContext());
+
+            // for a wifi-ONLY sync
+            if (prefs.getWifiOnlySync()) {
+
+                ConnectivityManager connMgr = (ConnectivityManager)
+                        getSystemService(Context.CONNECTIVITY_SERVICE);
+                NetworkInfo networkInfo = connMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
+                boolean isNotOnWifi = !(networkInfo.getType() == ConnectivityManager.TYPE_WIFI);
+                boolean isNotConnected = !(networkInfo.isConnected());
+
+                // if Wi-Fi connection doesn't exist then receiver is enabled
+                if (isNotOnWifi && isNotConnected) {
+                    new NetworkReceiver().setWifiReceiverComponent(true, getContext());
+                    return;
+                }
+            }
+            Log.d(Constants.TAG, "Performing a keyserver sync!");
             PowerManager pm = (PowerManager) KeyserverSyncAdapterService.this
                     .getSystemService(Context.POWER_SERVICE);
             @SuppressWarnings("deprecation") // our min is API 15, deprecated only in 20