storeToken(responseData){
        AsyncStorage.setItem('access_token', responseData, (err)=> {
        if(err){
            console.log("an error");
            throw err;
        }
        console.log("storage token was a success");
        }).catch((err)=> {
        console.log("error is: " + err);
        });
    }
async onLoginPressed() {
    this.setState({showProgress: true})
    username = this.state.username;
    password = this.state.password;
    try {
      let response = await fetch('https://roomies-backend-prithajnath.c9users.io/get_auth_token/', {
                              method: 'POST',
                              headers: {
                                'Accept': 'application/json',
                                'Content-Type': 'application/json',
                              },
                              body: JSON.stringify({
                                  username: username,
                                  password: password,
                              })
                            });
      let res = await response.text();
      if (response.status >= 200 && response.status < 300) {
          //Handle success
          let accessToken = res;
          console.log(accessToken);
          //On success we will store the access_token in the AsyncStorage
          this.storeToken(accessToken);
          this.redirect('Profile');
      } else {
          //Handle error
          let error = res;
          throw error;
      }
    } catch(error) {
        this.setState({error: error});
        console.log("error " + error);
        //this.setState({showProgress: false});
        }
    }