accessing_directories.dart

// accesing and requesting

 Future<List<Directory>?>? _externalStorageDirectory; // this will go in future in future builder



// this will go in onPresssed if you wanna use button to request everything

  void requestExternalStorageDirectory(StorageDirectory type) {
    setState(() {
      _externalStorageDirectory = getExternalStorageDirectories(type: type);
    });
  }

// this will define the directory

Widget _buildDirectories(
      BuildContext context, AsyncSnapshot<List<Directory>?> snapshot) {
    Text text = const Text('');
    if (snapshot.connectionState == ConnectionState.done) {
      if (snapshot.hasError) {
        text = Text("Error: ${snapshot.error}");
      } else if (snapshot.hasData) {
        final String combined = snapshot.data!
          // location of the directory ... in this case it root but in default it application directory
            .map((Directory d) => Directory('/storage/emulated/0'))
            .join(", ");
        text = Text("Path: $combined");
      } else {
        text = const Text('Path Unavailable');
      }
    }
    return Center(
      child: text,
    );
  }

// widget to show the which path we are in the directory.. but it doesn't show the files inside just directory path we are in

Column(
      children: [
        Padding(
          padding: const EdgeInsets.all(16.0),
          child: ElevatedButton(
            child: Text(
              !Platform.isAndroid
                  ? 'External directories are unavailable'
                  : 'Get External Storage Directories',
            ),
            onPressed: !Platform.isAndroid
                ? null
                : () {
                    requestExternalStorageDirecotry(
                      StorageDirectory.music,
                    );
                  },
          ),
        ),
        FutureBuilder<List<Directory>?>(
            future: _externalStorageDirectory, builder: _buildDirectories),
      ],
    );

// method for requesting permisions
  void requestingPermission() async {
    var status = await Permission.storage.status;
    if (!status.isGranted) {
      await Permission.storage.request();
    }
  }


// pass under the application(android\app\src\main\AndroidManifest.xml) in AndroidManifest.xml
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" />