sampek restore db method in db helper

lib/Util/DBHelper.dart

@@ -14,19 +14,25 @@ class DBHelper {
   static Database _db;
 
   Future<Database> get db async {
-    if (_db != null) return _db;
-    _db = await initDb();
+    if (_db == null) _db = await initDb();
+    //backupDatabase
+    String backupPath = join(_db.path.substring(0,_db.path.indexOf("/Android"))+"/Download/UnitDBBackup/", "UnitStocking.db");
+    io.File dbFile = io.File(_db.path);
+    dbFile.copySync(backupPath);
     return _db;
   }
 
   initDb() async {
     io.Directory documentsDirectory = await getExternalStorageDirectory();
     String path = join(documentsDirectory.path, "UnitStocking.db");
-    print("save at $path");
-    var theDb = await openDatabase(path, version: 1,onCreate: await _onCreate);
+    var theDb = await openDatabase(path, version: 1,onCreate: _onCreate);
     return theDb;
   }
 
+  restoreDb()async{
+    // do something here
+  }
+
   closeDb() async {
     final database = await db;
     await database.close();

lib/Util/Util.dart

@@ -12,7 +12,6 @@ import 'package:location/location.dart';
 import 'package:permission_handler/permission_handler.dart' as pHandler;
 import 'Prefs.dart';
 import 'package:oauth2/oauth2.dart' as oauth2;
-// import 'package:flutter_logs/flutter_logs.dart';
 
 class Util{
   bool tokenValidity = true;
@@ -55,12 +54,10 @@ class Util{
                         await InAppUpdate.performImmediateUpdate();
                       }
                       else throw {"message":"manual Update"};
-//                      util.showFlushbar(context, "${_updateInfo?.updateAvailable}");
                     }
                     catch(e){
                       await Future.delayed(Duration(milliseconds: 500));
                       await launchURL('https://play.google.com/store/apps/details?id=com.thamringroup.unitstocks');
-//                      util.showFlushbar(context, "Failed checking updates. $e.");
                     }
                   },
                 ),