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 loginScreen from './screens/loginScreen';
import registerScreen from './screens/registerScreen';
import homeScreen from './screens/homeScreen';
import addChatScreen from './screens/addChatScreen';
import { createStackNavigator } from '@react-navigation/stack';
import ChatScreen from './screens/ChatScreen';

const Stack = createStackNavigator();

const globalScreenOptions = {
  headerStyle: { backgroundColor: "#2C68EB" },
  headerTitleStyle: { color: "white", alignSelf: 'center' },
  headerTintColor: "white",
}
export default function App() {
  return (
    <NavigationContainer>
      <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: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
  },
});