flutter设置沉浸式状态栏

https://api.flutter.dev/flutter/services/SystemUiOverlayStyle-class.html
https://www.jianshu.com/p/b931c05b0df9

import 'package:flutter/material.dart';
import 'dart:io';
import 'package:flutter/services.dart';
void main(){
  runApp(MyApp());
  if(Platform.isAndroid){
    SystemUiOverlayStyle style = SystemUiOverlayStyle(
      statusBarColor: Colors.transparent,
      ///这是设置状态栏的图标和字体的颜色 
      ///Brightness.light  一般都是显示为白色
      ///Brightness.dark 一般都是显示为黑色
      statusBarIconBrightness: Brightness.light
    );
    SystemChrome.setSystemUIOverlayStyle(style);
  }
}