[移动开发]Flutter 本地文件操作

// 缓存接口数据
Future<dynamic> writeCache(type, data) async {
  // 获取路径
  var _filePath = await getFilePath(type);
  File _file = new File('$path/appointment');
  await _file.writeAsStringSync(data.toString());
  return;
}

// 从文件中读取数据
Future<String> readCache(fileName) async {
  // 数据缓存文件夹路径
  String _filePath = await getFilePath('storage');
  try {
    File _file = File('$_filePath/$fileName');
    // Read the file
    String contents = await _file.readAsStringSync();
    return contents;
  } catch (e) {
    print('error: $e');
    return '';
  }
}

// 获取app临时文件路径
Future getFilePath(type) async{
    var filepath = await getApplicationDocumentsDirectory(); // App内部file:data.com.nufang.zao/app-flutter/
    // var filepath = await getTemporaryDirectory();        // App内部file:data.com.nufang.zao/ache/
    // var filepath = await getExternalStorageDirectory();  // App内部file:data.com.nufang.zao/file/

    var file = Directory(filepath.path + '/$type');
    try {
      bool exists = await file.exists();
      if (!exists) {
        await file.create();
      }
    } catch (e) {
      print(e);
    }
    return file.path;
}