add* backup and restore db

android/app/src/main/AndroidManifest.xml

@@ -7,11 +7,13 @@
          FlutterApplication and put your custom class here. -->
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
     <application
         android:name="${applicationName}"
         android:label="assetstock"
         android:usesCleartextTraffic="true"
         android:networkSecurityConfig="@xml/network_security_config"
+        android:requestLegacyExternalStorage="true"
         android:icon="@mipmap/launcher_icon">
         <activity
             android:name=".MainActivity"

lib/home.dart

@@ -285,8 +285,8 @@ class _HomeState extends State<Home> {
                                   }
                                   if(isclear??false){
                                     var result = await DBHelper.database.restoreDb(context);
+                                    print("respond $result");
                                     if(result["STATUS"]==1){
-                                      await prefs.remove(keyClass.dbName);
                                       // await prefs.remove(keyClass.lastDownload);
                                       // await prefs.remove(keyClass.lastUpload);
                                       // await prefs.remove(keyClass.targetProccess);