Overview

With this package you can read, download, create and edit JSON files from Google Drive. You can also create folders and save the files into them.

before use

Project

1. First log in or register at console.cloud.google.com.
2. Create or select a project.

Activate API

1. Click on the Navigation menu in the upper left corner.
2. Go to "APIs & Services" > "Library" and select or search for "Google Drive API" and enable it.

OAuth 2.0

1. Select "APIs and Services" from the Navigation menu and then click on "Credentials".
2. Click on "+ CREATE CREDENTIALS" at the top and then select "OAuth client ID".
3. Click on "CONFIGURE CONSENT SCREEN".
4. Select User Type "External" and click on "CREATE".
5. Where there is a red star, fill in the fields and click on "SAVE AND CONTINUE".
6. Click on "ADD OR REMOVE SCOPES" and manually insert: https://www.googleapis.com/auth/drive.file, click on "ADD TO TABLE" and then on "UPDATE". After that click on "SAVE AND CONTINUE".
7. Add test users who will use the app. After adding go to "SAVE AND CONTINUE".
8. If all data is correct, then "BACK TO THE DASHBOARD".
9. Again select "Credentials" and at the top click on "+ CREATE CREDENTIALS" "OAuth Client ID".
10. Under "Application type" select the appropriate operating system (in this example it is Android).
11. At Name select the name for the Console, at Package name enter your Package name for example "com.example.app" and finally enter the SHA1. Here is a good explanation stackoverflow.com/questions/51845559/generate-sha-1-for-flutter-react-native-android-native-app.
12. Finally click on "CREATE".

API Key

1. Click on "+ CREATE CREDENTIALS" at the top and then select "API key".
2. When the API Key is created, you can copy it and close the window.
3. In the list "API Keys" click on the appropriate key to see the information.
4. Under "API restrictions" select "Restrict key".
5. At "Select APIs" select "Google Drive API" and confirm with "OK
6. Then click "SAVE"

The generated API Key is required in the package.

Additional information

In this package the following packages were used:

• google_sign_in
• googleapis
• http
• path_provider

Example:

Map content = {
  "Map" : {},
  "String" : "string",
  "int" : 0,
  "bool" : true,
  "List" : []
};
Map newContent = {
  "Map" : {},
  "String" : "string",
  "int" : 0,
  "bool" : true,
  "List" : [
    "updated"
  ]
};
String filename = "file";
String apiKey = "YOUR_API_KEY";// todo: insert the API key here

/// Create a JSON file
void _createJsonFile() async => await GoogleDriveWrite.createJsonFile(filename: filename, content: content);

/// Updating an existing file
void _updateJsonFile() async => await GoogleDriveWrite.updateJsonFile(filename: filename, content: newContent);

/// Read JSON file local
void _readJsonFile() async {
  Map jsonFileFromDrive = await GoogleDriveRead.readJsonFile(filename: filename, apiKey: apiKey);
  log("JSON File: \n$jsonFileFromDrive\n");
}

@override
Widget build(BuildContext context) {
  return Scaffold(
    appBar: AppBar(
      title: const Text("Home screen"),
    ),
    body: Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          ElevatedButton(
            child: const Text("create JSON file"),
            onPressed: () => _createJsonFile(),
          ),
          ElevatedButton(
            child: const Text("update JSON file"),
            onPressed: () => _updateJsonFile(),
          ),
          ElevatedButton(
            child: const Text("read JSON file"),
            onPressed: () => _readJsonFile(),
          ),
        ],
      ),
    ),
  );
}