login.dart

import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'package:ospek_unai/homepanitia.dart';
import 'package:shared_preferences/shared_preferences.dart';

class LoginPanitia extends StatefulWidget {
  @override
  _LoginPanitiaPage createState() => _LoginPanitiaPage();
}

enum LoginStatus{
  notSignIn,
  signIn
}

class _LoginPanitiaPage extends State<LoginPanitia> {
  LoginStatus _loginStatus = LoginStatus.notSignIn;
  String nomorindukpanitia, password;
  final _key = new GlobalKey<FormState>();

  bool _secureText = true;

  showHide() {
    setState(() {
      _secureText = !_secureText;
    });
  }

  check() {
    final form = _key.currentState;
    if (form.validate()) {
      form.save();
      //print("$nomorindukpanitia, $password");
      login();
    }
  }



  login() async {
    final response = await http.post(
        "http://10.0.2.2/aplikasi_ospekunai/loginpanitia.php",
        body: {"nomorinduk_panitia": nomorindukpanitia, "password": password});
    final data = jsonDecode(response.body);
    int value = data['value'];
    String pesan = data['message'];
    if (value==1) {
      setState(() {
        _loginStatus = LoginStatus.signIn;
        savePref(value);
      });

      print(pesan);

    } else {
      print(pesan);
    }
    //print(data);
  }

  savePref(int value)async{
    SharedPreferences preferences = await SharedPreferences.getInstance();
    setState(() {
      preferences.setInt("value", value);
      preferences.commit();
    });
  }




  var value;
  getPref()async{
    SharedPreferences preferences = await SharedPreferences.getInstance();
    setState(() {
      value = preferences.getInt("value");

      _loginStatus = value == 1 ? LoginStatus.signIn : LoginStatus.notSignIn;
    });
  }


  signOut()async{
    SharedPreferences preferences = await SharedPreferences.getInstance();
    setState(() {
      preferences.setInt("value", null);
      preferences.commit();
      _loginStatus = LoginStatus.notSignIn;
    });
  }



  @override
  void initState() {

    super.initState();
    getPref();
  }


  @override
  Widget build(BuildContext context) {
    switch (_loginStatus) {
      case LoginStatus.notSignIn:
        return Scaffold(
      appBar: AppBar(
        title: new Text("Login Panitia"),
      ),
      body: Form(
        key: _key,
        child: ListView(
          padding: EdgeInsets.all(16.0),
          children: <Widget>[
            TextFormField(
              validator: (e) {
                if (e.isEmpty) {
                  return "Please insert";
                }
              },
              onSaved: (e) => nomorindukpanitia = e,
              decoration: InputDecoration(labelText: "Nomor Induk"),
            ),
            TextFormField(
              obscureText: _secureText,
              onSaved: (e) => password = e,
              decoration: InputDecoration(
                  suffixIcon: IconButton(
                      icon: Icon(_secureText
                          ? Icons.visibility_off
                          : Icons.visibility),
                      onPressed: showHide),
                  labelText: "Password"),
            ),
            MaterialButton(
              onPressed: () {
                check();
              },
              child: Text("Login"),
            )
          ],
        ),
      ),
    );
        break;
      case LoginStatus.signIn :
        return HomePanitia(signOut);
        break;
    }

  }
}