如何在共享首选项中保存颜色 [英] how to save color in sharedpreferences

问题描述

我正在尝试将Color保存在sharedpreference中，但是它只有有限的数据类型(字符串，int，double等)，我不知道

i am trying to save Color in sharedpreference but it has only limited data type (String, int, double etc) i dont know

Future getColor() async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    Color color = prefs.getString("color"); //error 
    return color;
  }

  Future setColor(Color themeColor) async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    await prefs.setString("color", (themeColor); //error
  }

}

推荐答案

我希望这段代码对您有所帮助.可以用更漂亮的方式编写它，但希望您能理解.

I hope this code helps you. It can be written in a more beautiful way but I hope you get the idea.

//Convert the color to hex, Save it in preferences
var myColor = Colors.blue;
var hex = '#${myColor.value.toRadixString(16)}';
//save Hex value in sharedpreference.

//get the hex value from shared preferences and convert it into color.
Color yourColor= hexToColor(colorStringFromSharedPreference);

Color hexToColor(String code) {
  return Color(int.parse(code.substring(1, 7), radix: 16) + 0xFF000000);
}

此外，如注释中所建议，您还可以存储颜色的int值.

Also as suggested in the comment, you can also store the int value of the color.

int myColorInteger = myColor.value
//store integer value in sharedpreference

并使用Color的构造函数进行检索

and retrieving it and using Color's constructor

//retrieve intValue of color from sharedpreference and
Color myColor = Color(intValue)

这篇关于如何在共享首选项中保存颜色的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！