login check

@@ -5,6 +5,7 @@ import { createStackNavigator } from 'react-navigation-stack'
 // import MainScreen from './components/MainScreen';
 import Login from './source/Login';
 import MainScreen from './source/MainScreen';
+import {getId} from './source/component/DBhelper'
 
 // const AppStackNavigator = createStackNavigator({
 //   Main:{
@@ -14,11 +15,18 @@ import MainScreen from './source/MainScreen';
 
 // export default createAppContainer(AppStackNavigator);
 
+var initialName = ''
+
+if(getId() == true){
+  initialName = 'MainScreen'
+}
+else initialName = 'Login'
+
 const MainNavigator = createStackNavigator({
   Login : {screen: Login},
   MainScreen : {screen:MainScreen},
 },
-  {initialRouteName: 'Login',headerMode:'none'}
+  {initialRouteName: initialName,headerMode:'none'}
 );
 
 const App = createAppContainer(MainNavigator);

 import React, { Component } from 'react';
 import { View, Text, StyleSheet, TextInput, TouchableOpacity, Image } from 'react-native';
 import AddButton from '../component/AddButton'
-import {delete_all_data} from '../component/DBhelper'
+import {delete_all_data, deleteId} from '../component/DBhelper'
 
 var date = new Date();
 date.setHours(date.getHours()+9);
@@ -40,7 +40,9 @@ export default class SettingTab extends Component {
     delete_id(){
         this.setState({ID: ''})
         //save_app_data()
-        delete_all_data()
+        //delete_all_data()
+        deleteId()
+        this.props.navigation.navigate('Login');
     }
     render() {
         return (

@@ -5,6 +5,7 @@ import { createMaterialTopTabNavigator } from 'react-navigation-tabs'
 import HomeTab from './AppTabNavigator/HomeTab'
 import HistoryTab from './AppTabNavigator/HistoryTab'
 import SettingTab from './AppTabNavigator/SettingTab'
+import {registerID} from '../source/component/DBhelper'
 
 // 하단 탭 네비게이터 생성
 const AppTabNavigator = createMaterialTopTabNavigator({
@@ -39,14 +40,14 @@ export default class MainScreen extends Component {
   constructor(props) {
     super(props);
     this.state = {
-        ID: this.props.navigation.getParam('ID'),
+        ID: this.props.navigation.getParam('ID',''),
     };
   }
-
   static navigationOptions = {
     title: 'FW IOT'  }
 
   render() {
+    //registerID(this.state.ID);
     return <AppTabContainet/>; // AppTabContainet 컴포넌트를 리턴한다.
   }
 }

@@ -11,9 +11,41 @@ Waste.schema = {
   }
 };
 
-// Get the default Realm with support for our objects
-let realm = new Realm({schema: [Waste]});
+class ID {}
+ID.schema={
+  name:'ID',
+  properties:{
+    id : 'string',
+  }
+};
+
+export function registerID(_id){
+  if(_id != ''){
+    realm.write(()=>{
+    let user = realm.create('ID',{id:_id});
+    console.log('success')
+  });
+  } 
+}
 
+export function getId(){
+  let user = realm.objects('ID');
+  console.log(user.length);
+  if(user.length>0)
+    return true;
+  return false;
+}
+
+export function deleteId(){
+  let user = realm.objects('ID');
+  realm.write(()=>{
+    realm.delete(user);
+    console.log('success')
+  })
+}
+
+// Get the default Realm with support for our objects
+let realm = new Realm({schema: [Waste, ID]});
 export function add_data(responseJson){
    for(i = 0; i < responseJson.length; i++){
         realm.write(() => {
@@ -36,7 +68,9 @@ export function get_now_weight(){
     
     var recentWeight = wastes.filtered('date = $0', recent);
     console.log("now_weight",recentWeight)
+    if(recentWeight.length != 0)
       return recentWeight[0].weight;
+    else return 0;
 }
 
 export function get_last_update(){