@@ -8,12 +8,15 @@ import android.content.BroadcastReceiver;

 import android.content.Context;

 import android.content.Intent;

 import android.content.SharedPreferences;

+import android.net.ConnectivityManager;

+import android.net.NetworkInfo;

 import android.os.SystemClock;

 import android.preference.PreferenceManager;

 import android.support.v4.app.NotificationCompat;

 import app.librenews.io.librenews.R;

+import static android.content.Context.CONNECTIVITY_SERVICE;

 import static app.librenews.io.librenews.controllers.DebugManager.sendDebugNotification;

 /**

@@ -53,6 +56,14 @@ public class SyncManager {

     public static class RefreshBroadcastReceiver extends BroadcastReceiver {

         @Override

         public void onReceive(Context context, Intent intent) {

+            if(PreferenceManager.getDefaultSharedPreferences(context.getApplicationContext()).getBoolean("wifi_sync_only", false)) {

+                ConnectivityManager connManager = (ConnectivityManager) context.getSystemService(CONNECTIVITY_SERVICE);

+                int networkType = connManager.getActiveNetworkInfo().getType();

+                if(networkType != ConnectivityManager.TYPE_WIFI){

+                    sendDebugNotification("Not on WiFi, not syncing...", context);

+                    return;

+                }

+            }

             sendDebugNotification("Syncing with server...", context);

             FlashManager flashManager = new FlashManager(context);

             flashManager.refresh();

@@ -39,5 +39,7 @@

     <string name="how_to_use">You\'ll mostly interact with LibreNews through its notifications, as the app itself is just settings. \n\nYou\'ll probably get around 3 breaking news notifications per day, if you stick with the default settings.</string>

     <string name="final_notes_welcome_screen">LibreNews doesn\'t track you in any way, and doesn\'t have ads. It\'s completely open source, making the code free for anyone to see.</string>

     <string name="start_app">START LIBRENEWS</string>

+    <string name="wifi_sync_only_label">WiFi sync only</string>

+    <string name="wifi_sync_only_description">Whether LibreNews should sync only over WiFi (and not over cellular data). A LibreNews sync uses about 9 kB of data (less than 1% of a megabyte).</string>

 </resources>

@@ -40,5 +40,7 @@

     <string name="final_notes_welcome_screen">LibreNews doesn\'t track you in any way, and doesn\'t have ads. It\'s completely open source, making the code free for anyone to see.</string>

     <string name="start_app">START LIBRENEWS</string>

     <string name="status_text" formatted="false">syncing every {rate}</string>

+    <string name="wifi_sync_only_label">WiFi sync only</string>

+    <string name="wifi_sync_only_description">Whether LibreNews should sync only over WiFi (and not over cellular data). A LibreNews sync uses about 9 kB of data (less than 1% of a megabyte).</string>

 </resources>

@@ -40,4 +40,6 @@

     <string name="how_to_use">You\'ll mostly interact with LibreNews through its notifications, as the app itself is just settings. \n\nYou\'ll probably get around 3 breaking news notifications per day, if you stick with the default settings.</string>

     <string name="final_notes_welcome_screen">LibreNews doesn\'t track you in any way, and doesn\'t have ads. It\'s completely open source, making the code free for anyone to see.</string>

     <string name="start_app">START LIBRENEWS</string>

+    <string name="wifi_sync_only_label">WiFi sync only</string>

+    <string name="wifi_sync_only_description">Whether LibreNews should sync only over WiFi (and not over cellular data). A LibreNews sync uses about 9 kB of data (less than 1% of a megabyte).</string>

 </resources>

@@ -16,6 +16,12 @@

             android:key="automatically_refresh"

             android:summary="@string/auto_refresh_description"

             android:title="@string/auto_refresh_label" />

+        <SwitchPreference

+            android:defaultValue="false"

+            android:key="wifi_sync_only"

+            android:summary="@string/wifi_sync_only_description"

+            android:title="@string/wifi_sync_only_label"

+            android:dependency="automatically_refresh"/>

         <ListPreference

             android:defaultValue="5"

             android:dependency="automatically_refresh"