Flutter FutureBuilder

FutureBuilder.dart

  Future<String> get _localPath async {
    final directory = await getApplicationDocumentsDirectory();
    return directory.path;
  }
/////////////////////////////////////////////////////////
            FutureBuilder<String>(
              future: _localPath, // async work
              builder: (BuildContext context, AsyncSnapshot<String> snapshot) {
                switch (snapshot.connectionState) {
                  case ConnectionState.waiting:
                    return Text('Loading....');
                  default:
                    if (snapshot.hasError)
                      return Text('Error: ${snapshot.error}');
                    else
                      return Text('Result: ${snapshot.data}');
                }
              },

https://stackoverflow.com/a/51983699/11798617