flutterEmpty/lib/screens/config/support_config.dart

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:empty/components/background.dart';

class SupportScreen extends StatefulWidget {
  @override
  _SupportScreenState createState() => _SupportScreenState();
}

class _SupportScreenState extends State<SupportScreen> {

  String termsText = '';
  String privacyText = '';

  readTextFile(String filename) async {
    if( filename == 'terms' ){
      String _termsText = await rootBundle.loadString('assets/files/terms.txt');
      setState(() {
        termsText = _termsText;
      });
    }
    if( filename == 'privacy' ){
      String _privacyText = await rootBundle.loadString('assets/files/privacy.txt');
      setState(() {
        privacyText = _privacyText;
      });
    }
  }

  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    readTextFile('terms');
    readTextFile('privacy');
  }

  @override
  Widget build(BuildContext context) {
    return Background(
      image: Container(
        height: double.infinity,
        width: double.infinity,
        decoration: BoxDecoration(
            image: DecorationImage(
                image: AssetImage('assets/images/background_config.png'),
                fit: BoxFit.cover
            )
        ),
      ),
      child: Scaffold(
          backgroundColor: Colors.transparent,
          appBar: AppBar(
            title: Text('고객센터',style: TextStyle(fontSize: 18),),
            //centerTitle: true,
            backgroundColor: Colors.transparent,
            elevation: 0.0,
          ),
          body: SingleChildScrollView(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.center,
              children: [
                Row(),
                Padding(
                  padding: const EdgeInsets.all(20.0),
                  child: Text('앱 사용에 관한 문의 사항은 아래 이메일로 보내주세요',style: Theme.of(context).textTheme.bodyText1),
                ),
                Divider(),
                Text('dabutconsulting@gmail.com',style: Theme.of(context).textTheme.subtitle1),
                Divider(),
                ExpansionTile(
                  title: Text('서비스이용약관'),
                  children: [
                    Divider(),
                    ListTile(
                      title: Text(termsText),
                    )
                  ],
                ),
                ExpansionTile(
                  title: Text('개인정보취급방침'),
                  children: [
                    Divider(),
                    ListTile(
                      title: Text(privacyText),
                    )
                  ],
                ),
              ],
            ),
          )

      ),
    );
  }
}