App.js

import 'react-native-gesture-handler';
import { StatusBar } from 'expo-status-bar';
import React from 'react';
import { StyleSheet, Text, View } from 'react-native';
import { NavigationContainer } from '@react-navigation/native';
import { createStackNavigator } from '@react-navigation/stack';
import LoginScreen from './screens/LoginScreen';
import RegisterScreen from './screens/RegisterScreen';
import HomeScreen from './screens/HomeScreen';
import AddChatScreen from './screens/AddChatScreen';
import ChatScreen from './screens/ChatScreen';


const Stack = createStackNavigator();

const globalScreenOptions = {
  headerStyle: { backgroundColor: '#0b3c6e'},
  headerTitleStyle: { color:'white'},
  headerTintColor: "white",
}

export default function App() {
  return (
    <NavigationContainer style={styles.container}>

      <Stack.Navigator screenOptions={globalScreenOptions}>
        <Stack.Screen name='Login' component={LoginScreen} />
        <Stack.Screen name='Register' component={RegisterScreen}  />
        <Stack.Screen name='Home' component={HomeScreen}  />
        <Stack.Screen name='AddChat' component={AddChatScreen}  />
        <Stack.Screen name='Chat' component={ChatScreen}  />
      </Stack.Navigator>

    </NavigationContainer> 
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#f6f6f6',
    alignItems: 'center',
    justifyContent: 'center',
  },
});