Set proper default name for local device

src/main/java/com/nutomic/syncthingandroid/util/ConfigXml.java

@@ -72,6 +72,7 @@ public class ConfigXml {
         }
 
         if (isFirstStart) {
+            changeLocalDeviceName();
             changeDefaultFolder();
             generateLoginInfo();
         }
@@ -174,6 +175,23 @@ public class ConfigXml {
                 .getElementsByTagName("gui").item(0);
     }
 
+    /**
+     * Set model name as device name for Syncthing.
+     *
+     * We need to iterate through XML nodes manually, as mConfig.getDocumentElement() will also
+     * return nested elements inside folder element.
+     */
+    private void changeLocalDeviceName() {
+        NodeList childNodes = mConfig.getDocumentElement().getChildNodes();
+        for (int i = 0; i < childNodes.getLength(); i++) {
+            Node node = childNodes.item(i);
+            if (node.getNodeName().equals("device")) {
+                ((Element) node).setAttribute("name", Build.MODEL);
+            }
+        }
+        saveChanges();
+    }
+
     /**
      * Change default folder id to camera and path to camera folder path.
      */