how to update flutter app AndroidManifest.xml meta-data in json data

To update the meta-data element in the AndroidManifest.xml file of your Flutter app with JSON data, you need to follow these steps:

1. Define your JSON data in a file, either locally in your project or retrieved from an external source. For example, let's say your JSON data looks like this:

   json
   {
     "my_database_key": "my_database_value"
   }
   

2. Add the meta-data element to your AndroidManifest.xml file, as follows:

   php
   <application>
     <meta-data
       android:name="com.example.myapp.MY_DATABASE_KEY"
       android:value="@string/my_database_value" />
   </application>
   

   Replace MY_DATABASE_KEY with the key of your JSON data, and my_database_value with a placeholder value that will be replaced by your JSON data at runtime.

3. In your main.dart file, retrieve your JSON data and update the meta-data element:

   javascript
   import 'dart:convert' show json;
   import 'package:flutter/services.dart' show rootBundle;
   import 'package:flutter/widgets.dart';
   
   void main() async {
     // Retrieve JSON data from a file
     String jsonData = await rootBundle.loadString('assets/my_database.json');
     Map<String, dynamic> database = json.decode(jsonData);
   
     // Update the meta-data element
     await updateMetaDataElement(
         'com.example.myapp.MY_DATABASE_KEY', database['my_database_key']);
   
     runApp(MyApp());
   }
   
   Future<void> updateMetaDataElement(
       String elementName, String elementValue) async {
     final metaElement = findMetaElement(elementName);
     metaElement.attributes['android:value'] = elementValue;
   }
   
   XmlElement findMetaElement(String elementName) {
     final AndroidManifest manifest = AndroidManifest.from(
         File('android/app/src/main/AndroidManifest.xml').readAsStringSync());
     final appElement = manifest.manifestElement
         .findElements('application')
         .first;
     return appElement.findElements('meta-data').firstWhere(
         (element) => element.attributes['android:name'] == elementName,
         orElse: () => null);
   }
   

   In this example, we use the rootBundle class from the flutter/services.dart package to load the JSON data from a file. We then decode the JSON data into a Map object, and retrieve the value of the my_database_key key.

   Next, we define an updateMetaDataElement method that takes the name of the meta-data element to update (elementName) and the new value to set (elementValue). This method uses the findMetaElement method to locate the meta-data element with the specified name, and then updates its android:value attribute.

   The findMetaElement method uses the AndroidManifest class from the flutter_manifest package to parse the AndroidManifest.xml file and locate the meta-data element with the specified name.

   Finally, we call the updateMetaDataElement method with the key and value of our JSON data.

Note: Make sure to import the flutter_manifest package by adding it to your pubspec.yaml file and running flutter pub get.