Primer intento de añadir redux. No funciona, tiene un bug. Ahora estoy creando y conectando el store desde App.js

App.js

 import { NavigationContainer } from '@react-navigation/native';
 import { createStackNavigator } from '@react-navigation/stack';
 
-import RegisterScreen from './screens/RegisterScreen';
-import LoginScreen from './screens/LoginScreen';
+import RegisterScreen from './screens/auth/RegisterScreen';
+import LoginScreen from './screens/auth/LoginScreen';
 import { firebaseConfig } from './config/firebaseConfig';
 import { Text, View } from 'react-native';
 import { styles } from './config/styles';
 
-import HomeScreen from './screens/Home_page';
+import HomeScreen from './screens/main/Home_page';
 import { Provider} from 'react-redux'
 import { createStore, applyMiddleware } from 'redux';
 import rootReducer from './redux/reducers'
 import thunk from 'redux-thunk'
+import { connect } from 'react-redux'
+import { bindActionCreators } from 'redux' 
+import { fetchUser } from './redux/actions/index'
 /*const seConfig = {
   apiKey: "AIzaSyDW-ABAQ3r_WR7C7WC_3VprL77NcAoitJI",
   authDomain: "freehand-d8ecd.firebaseapp.com",
       <Provider store={store}>
         <NavigationContainer>
           <Stack.Navigator initialRouteName="Home">
-            <Stack.Screen name="HomeScreen" component={AddScreen} />
+            <Stack.Screen name="Home" component={HomeScreen} />
           </Stack.Navigator>
         </NavigationContainer>
       </Provider>
   }
 }
 
+const mapStateToProps = (store) => ({
+  currentUser: store.userState.currentUser
+})
+const mapDispatchProps = (dispatch) => bindActionCreators({fetchUser}, dispatch);
 
+export default connect(mapStateToProps, mapDispatchProps)(App);

package-lock.json

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-        "react-native-web": "~0.13.12"
+        "react-native-paper": "^4.9.2",
+        "react-native-web": "~0.13.12",
+        "react-redux": "^7.2.5",
+        "redux": "^4.1.1",
+        "redux-thunk": "^2.3.0"
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package.json

     "react": "16.13.1",
     "react-dom": "16.13.1",
     "react-native": "https://github.com/expo/react-native/archive/sdk-42.0.0.tar.gz",
-    "react-native-web": "~0.13.12"
+    "react-native-paper": "^4.9.2",
+    "react-native-web": "~0.13.12",
+    "react-redux": "^7.2.5",
+    "redux": "^4.1.1",
+    "redux-thunk": "^2.3.0"
   },
   "devDependencies": {
     "@babel/core": "^7.9.0"

redux/actions/index.js

+import { USER_STATE_CHANGE } from '../constants/index'
+import firebase from 'firebase'
+
+//Export to the app to trigger DB action
+export function fetchUser(){
+    return((dispatch) => {
+        firebase.firestore()
+        .collection("Users")
+        .doc(firebase.auth().currentUser.uid)
+        .get()
+        .then((snapshot) => {
+            if(snapshot.exists){
+                dispatch({type : USER_STATE_CHANGE, currentUser : snapshot.data()})
+            }
+            else{
+                console.log('Does not exist')
+            }
+        })
+    })
+}

redux/constants/index.js

+export const USER_STATE_CHANGE = 'USER_STATE_CHANGE'

redux/reducers/index.js

+import { combineReducers } from "redux"
+import { user } from './user'
+
+const Reducers = combineReducers({
+    userState: user
+})
+
+export default Reducers

redux/reducers/user.js

+const initialState = {
+    currentUser: null
+}
+
+//Action -an object describing what happened.
+//Reducers -calculate the new state based on the old state and the action
+//The state is equal to the initial state if no state is passed along to this f (an action is passed along the initial state)
+//Remember, our actions will be calling the DB, fetching data, and sending it to our reducer (this f)
+//which will then update the state. (Esto va a devolver al user con sus estado, nuevo o igual)
+//Esto esta setea'o para recivir info de otros files
+export const user = (state = initialState, action) => {
+    return {
+        ... state,
+        currentUser: action.currentUser
+    }
+}

screens/auth/LoginScreen.js

 import { TextInput, TouchableWithoutFeedback, Keyboard, ImageBackground, Image } from "react-native";
 import firebase from "firebase";
 
-import { styles } from "../config/styles";
-import CustomButton from "../components/CustomButton";
+import { styles } from "../../config/styles";
+import CustomButton from "../../components/CustomButton";
 
 
 export default class LoginScreen extends Component {
         
         return (
             <TouchableWithoutFeedback style={styles.stdcontainer} onPress={Keyboard.dismiss} accessible={false}>
-                <ImageBackground style={styles.stdcontainer} source={require('../assets/yellow-white.jpg')}>
-                    <Image style={styles.logo} resizeMode="contain" source={require("../assets/open-hand.png")}/>
+                <ImageBackground style={styles.stdcontainer} source={require('../../assets/yellow-white.jpg')}>
+                    <Image style={styles.logo} resizeMode="contain" source={require("../../assets/open-hand.png")}/>
                     <TextInput style={styles.regtxtfield} placeholder="Email" onChangeText={(email) => this.setState({ email })}/>
                     <TextInput style={styles.regtxtfield} placeholder="Password" onChangeText={(password) => this.setState({ password })} secureTextEntry={ true }/>
                     <CustomButton marginTop={70} title="Login" onPress={() => this.onLogin()}/>

screens/auth/RegisterScreen.js

 import firebase from "firebase";
 import { Picker } from "@react-native-picker/picker";
 
-import { styles } from "../config/styles";
-import CustomButton from "../components/CustomButton";
+import { styles } from "../../config/styles";
+import CustomButton from "../../components/CustomButton";
 
 export default class RegisterScreen extends Component {
     constructor(props) {
     render() {
         return (
             <TouchableWithoutFeedback style={styles.regcontainer} onPress={Keyboard.dismiss} accessible={false}>
-                <ImageBackground style={styles.regcontainer} source={require('../assets/yellow-white.jpg')}>
+                <ImageBackground style={styles.regcontainer} source={require('../../assets/yellow-white.jpg')}>
                     <TextInput style={styles.regtxtfield} placeholder="Userame" onChangeText={(username) => this.setState({ username })}/>
                     <TextInput style={styles.regtxtfield} placeholder="Email" onChangeText={(email) => this.setState({ email })}/>
                     <TextInput style={styles.regtxtfield} placeholder="Password" onChangeText={(password) => this.setState({ password })} secureTextEntry={ true }/>

screens/main/Home_page.js

 import {List, Divider} from 'react-native-paper'
 import Loading from './Loading'
 import firebase from 'firebase';
-import { styles } from "../config/styles";
+import { styles } from "../../config/styles";
 import { TextInput, TouchableWithoutFeedback, Keyboard, ImageBackground} from "react-native";
 
 export default function Home_page({navigation}) {
   
   return (
     <View>
-    <ImageBackground style={styles.stdcontainer} source={require('../assets/yellow-white.jpg')}>
+    <ImageBackground style={styles.stdcontainer} source={require('../../assets/yellow-white.jpg')}>
         <FlatList
           data={threads}
           keyExtractor = {item => item._id}