implement changing username

flutter/lib/utils/dialogs.dart

@@ -0,0 +1,29 @@
+import 'package:flutter/material.dart';
+
+class UIDialogs {
+  static Future<String?> showTextInput(BuildContext context, String title, String hintText) {
+    var _textFieldController = TextEditingController();
+
+    return showDialog(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: Text(title),
+        content: TextField(
+          autofocus: true,
+          controller: _textFieldController,
+          decoration: InputDecoration(hintText: hintText),
+        ),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.of(context).pop(),
+            child: Text('Cancel'),
+          ),
+          TextButton(
+            onPressed: () => Navigator.of(context).pop(_textFieldController.text),
+            child: Text('OK'),
+          ),
+        ],
+      ),
+    );
+  }
+}