flutter-template/lib/common/trtc/TxUtils.dart

import 'package:flutter/material.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:flutter_styled_toast/flutter_styled_toast.dart' as StyledToast;
import 'package:shared_preferences/shared_preferences.dart';
import 'dart:math';

const USERID_KEY = "UserId";

class TxUtils {
  static String _loginUserId = '';
  static() {
    if (_loginUserId == '') {
      getStorageByKey(USERID_KEY).then((value) {
        _loginUserId = value;
      });
    }
  }

  static showErrorToast(text, context) {
    Fluttertoast.showToast(
      msg: text,
      toastLength: Toast.LENGTH_SHORT,
      gravity: ToastGravity.BOTTOM,
      timeInSecForIosWeb: 3,
      backgroundColor: Colors.red,
      textColor: Colors.white,
      fontSize: 16.0,
    );
  }

  static getRandomNumber() {
    Random rng = new Random();
    //2147483647
    String numStr = '';
    for (var i = 0; i < 9; i++) {
      numStr += rng.nextInt(9).toString();
    }
    return int.tryParse(numStr);
  }

  static List<String> _defaltUrlList = [
    'https://imgcache.qq.com/operation/dianshi/other/7.157d962fa53be4107d6258af6e6d83f33d45fba4.png',
    'https://imgcache.qq.com/operation/dianshi/other/5.ca48acfebc4dfb68c6c463c9f33e60cb8d7c9565.png',
    'https://imgcache.qq.com/operation/dianshi/other/1.724142271f4e811457eee00763e63f454af52d13.png',
    'https://imgcache.qq.com/operation/dianshi/other/4.67f22bd6d283d942d06e69c6b8a2c819c0e11af5.png',
    'https://imgcache.qq.com/operation/dianshi/other/6.1b984e741cc2275cda3451fa44515e018cc49cb5.png',
    //先不用这种图片，或者和白色字体不搭配
    //'https://imgcache.qq.com/operation/dianshi/other/2.4c958e11852b2caa75da6c2726f9248108d6ec8a.png',
  ];
  static getRandoAvatarUrl() {
    Random rng = new Random();
    return _defaltUrlList[rng.nextInt(_defaltUrlList.length)];
  }

  static getDefaltAvatarUrl() {
    return _defaltUrlList[0];
  }

  static showToast(String text, context) {
    Fluttertoast.cancel();
    Fluttertoast.showToast(
      msg: text,
      toastLength: Toast.LENGTH_SHORT,
      gravity: ToastGravity.BOTTOM,
      timeInSecForIosWeb: 3,
      backgroundColor: Color.fromRGBO(192, 192, 192, 0.3),
      textColor: Colors.black,
      fontSize: 16.0,
    );
  }

  static showStyledToast(String text, BuildContext context) {
    StyledToast.showToast(
      text,
      context: context,
      position: StyledToast.StyledToastPosition.center,
    );
  }

  static setStorageByKey(key, value) async {
    if (key == USERID_KEY) {
      _loginUserId = value;
    }
    SharedPreferences sharedPreferences = await SharedPreferences.getInstance();
    sharedPreferences.setString(key, value);
  }

  static Future<String> getStorageByKey(key) async {
    SharedPreferences sharedPreferences = await SharedPreferences.getInstance();
    String? rStr = sharedPreferences.getString(key);
    return rStr == null ? Future.value('') : Future.value(rStr);
  }

  static Future<String> getLoginUserId() {
    if (_loginUserId == '') {
      return getStorageByKey(USERID_KEY);
    }
    return Future.value(_loginUserId);
  }
}