companion_app/client/Screens/ProfileScreen.js

import React, { Component } from "react";
import { Text, View, StyleSheet, Button } from "react-native";

export default class ProfileScreen extends Component {
  prueba = async()=>{
    let response = await fetch('http://05cb04aa6bc5.ngrok.io/api/hello',{
      method: 'GET',
      headers: {
        Authorization: 'Token c33cc0e20cdf09a12d1e3e3de2515f3e9f2fd008'
      }
    })
    let responseJson = await response.json()
    console.log(responseJson)
  }
  render() {
    return (
      <View style={styles.container}>
        <Text> Profile Screen </Text>
        <Text style={{ fontSize: 20, fontWeight: "bold" }}>
          Welcome, {this.props.navigation.getParam("username")}
        </Text>
        <Button
          title="Sign out"
          onPress={() => this.props.navigation.navigate("Login")}
        />
        <Button
          title="Test"
          onPress={this.prueba}
        />

        <Button
          title="Add Taken Course"
          onPress= {() => this.props.navigation.navigate("AddTakenCourse")}
        />

        <Button
          title="Settings"
          onPress= {() => this.props.navigation.navigate("Settings")}
        />
        
      </View>
    );
  }
}

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