Develop Reference

How can I make my edit text survive configuration changes, with using viewmodel and without using databinding

I have created a login screen.
If I type something on my edit text and rotate my device,
the data gets lost.
How can I make my edit texts, survive these changes?
I have created a loginViewModel in which I am just fetching the data from the api.
Here is my loginActivity
public class LogInActivity extends AppCompatActivity {
private TextInputLayout mLoginUserName, mLoginPassword;
private LoginViewModel loginViewModel;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_log_in);
loginViewModel = new LoginViewModel(getApplication(),
this);
mLoginPassword = findViewById(R.id.logInPassword);
mLoginUserName = findViewById(R.id.logInUserName);
Button mFinalLoginButton =
findViewById(R.id.finalLogInButton);
TextView mForgotPassword =
findViewById(R.id.text_view_forgot_password);
mForgotPassword.setOnClickListener(new
View.OnClickListener() {
#Override
public void onClick(View v) {
startActivity(new Intent(LogInActivity.this,
ForgotPasswordSend.class));
}
});
mFinalLoginButton.setOnClickListener(new
View.OnClickListener() {
#Override
public void onClick(View v) {
final String userName =
mLoginUserName.getEditText().getText().toString().trim();
final String userPass =
mLoginPassword.getEditText().getText().toString().trim();
if (userName.isEmpty())
mLoginUserName.setError("Please enter User
Name");
else mLoginUserName.setError(null);
if (userPass.isEmpty()) {
mLoginPassword.setError("Please enter
password");
} else {
mLoginPassword.setError(null);
loginViewModel.logInRequest(userName,
userPass);
}
}
});
}}
This is my loginViewModel. Right now it is not working as a viewmodel. I just have named it but i want to make it work as a viewmodel class
class LoginViewModel extends AndroidViewModel {
private final Context context;
private final SharedPrefs sharedPrefs = new SharedPrefs(getApplication());
public LoginViewModel(#NonNull Application application, Context context) {
super(application);
this.context = context;
}
public void logInRequest(final String userName, String userPassword) {
final JSONObject jsonObject = new JSONObject();
try {
jsonObject.put("identifier", userName);
jsonObject.put("password", userPassword);
} catch (JSONException e) {
e.printStackTrace();
}
APIService apiService = RetrofitClient.getAPIService();
Call<String> logInResponse = apiService.logIn(jsonObject.toString());
logInResponse.enqueue(new Callback<String>() {
#Override
public void onResponse(Call<String> call, Response<String> response) {
if (response.message().equals("OK")) {
try {
JSONObject jsonObjects = new JSONObject(response.body());
JSONObject token = jsonObjects.getJSONObject("token");
String key = token.getString("token");
String sUserName = jsonObjects.getString("username");
String email = jsonObjects.getString("email");
String firstName = jsonObjects.getString("firstName");
String lastName = jsonObjects.getString("lastName");
sharedPrefs.saveUserName(sUserName);
sharedPrefs.saveEmail(email);
sharedPrefs.saveFullName(firstName, lastName);
sharedPrefs.saveToken(key);
context.startActivity(new Intent(context, HomeActivity.class));
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Toast.makeText(getApplication(), "Wrong User Name or Password", Toast.LENGTH_SHORT).show();
}
}
#Override
public void onFailure(Call<String> call, Throwable t) {
Toast.makeText(getApplication(), "Something went wrong
please try again", Toast.LENGTH_SHORT).show();
}
});
}}

Facebook logins only in Editor or Development Build(Unity 3D)

I have a problem with the Facebook SDK. It works fine in Editor and in apk(if i check the development build option in Unity), but on release build it doesn't work.
Here is my code
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Facebook.Unity;
using UnityEngine.UI;
using Facebook.MiniJSON;
public class FBManager : MonoBehaviour {
[SerializeField]private Text FBErrorText;
public RawImage FBProfilePicture;
public Image DefaultAvatar;
public Text UsernameText;
public Text WelcomeMessage;
public Button FacebookButton;
private Color fbProfilePictureColor;
private Color defaultAvatarColor;
private string getData;
private string FBUserName;
void Awake()
{
if (!FB.IsInitialized)
{ FBErrorText.text = "fb not ini, initializing";
FB.Init(InitCallBack, OnHideUnity);
FBErrorText.text = "called fb.init";
}
else
{ FBErrorText.text += "initialized";
FB.ActivateApp();
FBErrorText.text += "called fb.activateApp";
}
fbProfilePictureColor = FBProfilePicture.color;
defaultAvatarColor = DefaultAvatar.color;
fbProfilePictureColor.a = 0f;
FBProfilePicture.color = fbProfilePictureColor;
}
void Start()
{
//StartCoroutine (FbLoginWait ());
}
IEnumerator FbLoginWait()
{
yield return new WaitUntil (()=> FB.IsInitialized);
FBLogin ();
}
//auto logare
private void InitCallBack()
{
if (FB.IsInitialized)
{
//UsernameText.text = "Initialized FB SDK";
FBErrorText.text = "fb is initialized";
FB.ActivateApp ();
FBErrorText.text = "fb activated app";
}
else
{
FBErrorText.text = "Failed to initialize the Facebook SDK";
Debug.Log ("Failed to initialize the Facebook SDK");
}
}
private void OnHideUnity(bool isGameShown)
{
if (!isGameShown)
{
Time.timeScale = 0;
}
else
{
Time.timeScale = 1;
}
}
private void HandleLoginFB(bool IsLogged)
{
if (IsLogged)
{
FBErrorText.text = "user logged in";
Debug.Log ("User logged in");
}
else
{
FBErrorText.text = "user cancelled login";
Debug.Log ("User cancelled login");
}
}
private void AuthCallback(IResult result)
{
FBErrorText.text = "called authcallback";
HandleLoginFB (FB.IsLoggedIn);
FBErrorText.text = "handling fb";
if (FB.IsLoggedIn)
{
var aToken = Facebook.Unity.AccessToken.CurrentAccessToken;
Debug.Log (aToken.UserId);
foreach (string perm in aToken.Permissions) {
Debug.Log (perm);
}
FB.API ("/me/picture?type=square&height=50&width=50", HttpMethod.GET, UpdateProfileImage);
FB.API ("me?fields=name", HttpMethod.GET, GetUsername);
FBErrorText.text = "fb is logged in";
}
else
{
FBErrorText.text = "fb is not logged in";
}
}
public void FBLogin()
{
FBErrorText.text = "called fblogin";
List<string> perms = new List<string> () { "public_profile, email", "user_friends" };
FBErrorText.text = "created perms";
FB.LogInWithReadPermissions (perms, AuthCallback);
FBErrorText.text = "ended fblogin";
}
private void UpdateProfileImage(IGraphResult result)
{
if(result.Texture != null)
{
FBProfilePicture.texture = result.Texture;
defaultAvatarColor.a = 0f;
fbProfilePictureColor.a = 255f;
DefaultAvatar.color = defaultAvatarColor;
FBProfilePicture.color = fbProfilePictureColor;
}
}
private void GetUsername(IGraphResult result)
{
FBUserName = result.ResultDictionary ["name"].ToString ();
UsernameText.text = FBUserName;
WelcomeMessage.text = FBUserName + "'s NET WORTH";
}
}
(or the same code here https://hastebin.com/osatiketij.cs)
The last error text on the screen which appears is : "created perms", so right before the FB.LogInWithReadPermissions method is called, no error text appears after that, but no login also.
Any idea what it might be ?

For everyone coming to this thread : how I manage to fix this was by using Android Studio to see with the Logcat why it doesn't work, and it was "missing" a class. For anyone coming here, I fixed it by adding "-keep class com.facebook.** {*;}" to my proguard-user file.

xamarin android webview no longer retrieves page served locally with httplistener

We have a xamarin android app that contains a httplistener that serves up html, js, css and json calls, to a single page app running in a full screen webview. As of Xamarin 3.5 onwards the webview fails to retrieve this localhost address which we run on port 31316. Prior to this release this was functioning correctly.
From what i can see, the httplistener seems healthy, as we can call it with the WebRequest library correctly, which leads me tb believe that something has changed to the webview.
Any assistance would be greatly appreciated.
Below is a sample app demonstrating the behaviour:
using System;
using System.Net;
using Android.App;
using Android.Content;
using Android.OS;
using Android.Webkit;
using Android.Widget;
using System.IO;
using System.Text;
namespace HttpListenerTest
{
[Activity (Label = "HttpListenerTest", MainLauncher = true, Icon = "#drawable/icon")]
public class MainActivity : Activity
{
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
SetContentView(Resource.Layout.Main);
StartService(new Intent(this, typeof(HttpListenerTestService)));
var webView = (WebView)this.FindViewById<WebView>(Resource.Id.webview);
webView.Settings.AllowFileAccess = true;
webView.Settings.BlockNetworkLoads = false;
webView.LoadUrl("http://localhost:31316/");
//webView.LoadData (Activities.html, "text/html", "UTF-8");
var button = FindViewById<Button>(Resource.Id.button1);
button.Click += delegate
{
AlertDialog.Builder alert1;
alert1 = new AlertDialog.Builder(this);
try
{
if(!Activities.httpListener.IsListening)
{
alert1.SetMessage("Listener has stopped listening");
alert1.Show();
return;
}
string url = "http://localhost:31316/" + DateTime.Now.ToString("O");
var request = (HttpWebRequest)WebRequest.Create(new Uri(url));
request.Method = "GET";
string responseString = "";
using (WebResponse response = request.GetResponse())
{
StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
responseString = reader.ReadToEnd();
response.Close();
reader.Close();
}
alert1.SetMessage(responseString);
}
catch (Exception e)
{
alert1.SetMessage(e.Message + " " + e.StackTrace);
}
alert1.Show();
};
}
}
[Service(Label = "HttpListenerTest Service")]
public class HttpListenerTestService : Service
{
public override IBinder OnBind(Intent intent)
{
return null;
}
public override void OnCreate()
{
base.OnCreate();
Activities.InitRest();
}
public override void OnDestroy()
{
}
public override void OnStart(Intent intent, int startId)
{
base.OnStart(intent, startId);
}
private void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e)
{
}
}
public static class Activities
{
public static HttpListener httpListener { get; set; }
public static Thread RestThread { get; set; }
public const string html = "<html>hello world</html>";
public static void InitRest()
{
RestThread = new Thread(StartRest) { Name = "Rest Service" };
RestThread.Start();
}
private static void StartRest()
{
httpListener = new HttpListener { IgnoreWriteExceptions = true };
httpListener.Prefixes.Add(#"http://localhost:31316/");
httpListener.AuthenticationSchemes = AuthenticationSchemes.Anonymous;
httpListener.Start();
httpListener.BeginGetContext(HandleRequest, httpListener);
}
public static void HandleRequest(IAsyncResult result)
{
Console.WriteLine ("==========================HandleRequest==========================");
var context = httpListener.EndGetContext(result);
var unescapedUrl = Uri.UnescapeDataString(context.Request.RawUrl);
var bytes = new byte[html.Length * sizeof(char)];
Buffer.BlockCopy(html.ToCharArray(), 0, bytes, 0, bytes.Length);
context.Response.ContentLength64 = bytes.Length;
context.Response.OutputStream.Write(bytes, 0, bytes.Length);
context.Response.ContentType = "text/html";
//context.Response.ContentEncoding = "UTF-8";
context.Response.OutputStream.Close();
context.Response.OutputStream.Dispose();
context.Response.StatusCode = 200;
httpListener.BeginGetContext(HandleRequest, httpListener);
}
}
}

Creating User Session in MonoDroid

I am developing and android application which required user to login. I am using Monodroid to develop this application. In my application there are bunch of activities that will be started as the user logs in. I have set up Login Activity as main launcher and when user is successfully logged in , user will be sent to main activity.
I some how want to save session for the user so that user do not need to login every time they start the application.
As monodroid is very new to me, i am not able to make that work. People recommended me using SharedPrefrencs to create session, but tried lot to make it work, application always crashed.
The reason for crashing is null value of user, when user is in mainactivity. As recommended by many users i create Main Activity as main laucher and check if user is logged in or not from there. But nothing worked for me.
I have included my whole code for Login Activity and Main Activity. I want to save "driverId" in prefrences and when ever app is relauched main activity will retrieve "driverId" from the prefrences.
Please some body who is familiar with monodroid enviroment can help me to fix this.
Login Activity Code
using System;
using Android.App;
using Android.Content;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;
using Android.Locations;
using RestSharp;
using TheNorthStar.Api.Requests;
using TheNorthStar.Api.Results;
using NorthStar.Driver.Application;
using Android.Preferences;
using Object = Java.Lang.Object;
namespace NorthStar.Driver
{
public class DriverLogonAsync : AsyncTask
{
private ProgressDialog processDialog;
private Context m_context;
private DriverLogon m_driver;
private bool _resterror;
public DriverLogonAsync( Context context, DriverLogon driver )
{
m_context = context;
m_driver = driver;
_resterror = false;
}
/*
* throws
* should separate out logic and use MyMessagebox..
*/
private void SetComfirmAlertBox(string carNum, DriverLogonResult result)
{
var api = new ConnectToSever(Helper.GetServer(m_context));
string resultOfCarDetail; CarDetails res;
try
{
resultOfCarDetail = api.ComfirmLogginOn(m_driver);
}
catch
{
Android.Util.Log.Info("EXC_conflogon1", "confirm logging on failed");
throw;
}
try
{
res = Newtonsoft.Json.JsonConvert.DeserializeObject<CarDetails>(resultOfCarDetail);
}
catch (Exception ex)
{
Android.Util.Log.Info("EXC_conflogon2", "deserialize confirm logging on failed\n" + ex.Message);
throw;
}
if (res.carExists != true)
{
MyMessageBox.SetAlertBox("Opps!!!!!!!!", "This Car Number Was Wrong!!!!", "OK", m_context);
}
else
{
string carType = res.carType;
string seatNum = res.numOfSeats.ToString();
// MainActivity act = new MainActivity( result.driverId );
var mact = new Intent(m_context,typeof(MainActivity) );
mact.PutExtra( "driverID", result.driverId.ToString() );
MyMessageBox.SetAlertBox("Comfirm!", "Your car is a: " + carType + " with " + seatNum + " seats??", "Yes", "No", mact,m_context);
}
}
/*private void ChangeDriverStatues()
{
}*/
protected override void OnPreExecute()
{
base.OnPreExecute();
processDialog = ProgressDialog.Show( m_context, "Driver Loging On...", "Please Wait...", true, true);
}
protected override Object DoInBackground(params Object[] #params)
{
var api = new ConnectToSever(Helper.GetServer(m_context));
string res = string.Empty;
try
{
res = api.DriverLogingOn(m_driver);
}
catch
{
_resterror = true;
Android.Util.Log.Info("EXC_dlogon1", "driver logon failed");
return -1;
}
return res;
}
protected override void OnPostExecute(Object result)
{
base.OnPostExecute(result);
//hide and kill the progress dialog
processDialog.Hide();
processDialog.Cancel();
if (_resterror == true)
{
Android.Util.Log.Info("EXC_dlogon2", "logon connection has failed, noop");
return;
}
DriverLogonResult resDriverDetail;
try
{
resDriverDetail = Newtonsoft.Json.JsonConvert.DeserializeObject<DriverLogonResult>(result.ToString());
}
catch (Exception ex)
{
Android.Util.Log.Info("EXC_dlogon3", "logon deser has failed, noop\n" + ex.Message);
return;
}
if (resDriverDetail.logonSuccess)
{
this.SetComfirmAlertBox( m_driver.carNum, resDriverDetail );
}
else
{
MyMessageBox.SetAlertBox("Wrong!", "Wrong username or password!!!", "OK!",m_context);
}
}
}
[Activity(Label = "MyDriver-Driver", MainLauncher = true, Icon = "#drawable/icon", NoHistory = true)]
public class Activity1 : Activity
{
private void CreateAlert()
{
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.SetTitle("GPS is Off")
.SetMessage("You need GPS to you this application."+ "\n" +
"Do you want to go to settings menu?")
.SetPositiveButton("Setting",
(sender, e) =>
{
Intent intent = new Intent(Android.Provider.Settings.ActionLocationSourceSettings);
StartActivity(intent);
this.Finish();
})
.SetNegativeButton("No", (sender, e) => this.Finish());
AlertDialog alert = builder.Create();
alert.Show();
}
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.Main);
Android.Util.Log.Info("EXC_logstart", "**************** starting driver module ****************");
Boolean isGPSEnabled = false;
Boolean isNetworkEnabled = false;
LocationManager _locationManager;
_locationManager = (LocationManager)GetSystemService(LocationService);
isGPSEnabled = _locationManager.IsProviderEnabled(LocationManager.GpsProvider);
// getting network status
isNetworkEnabled = _locationManager.IsProviderEnabled(LocationManager.NetworkProvider);
if (!isGPSEnabled && !isNetworkEnabled)
{
CreateAlert();
}
// Get our button from the layout resource,
// and attach an event to it
EditText eTextUsername = FindViewById<EditText>(Resource.Id.UserNameBox);
EditText eTextPassword = FindViewById<EditText>(Resource.Id.PasswordBox);
EditText eTextCarNum = FindViewById<EditText>(Resource.Id.CarNumBox);
Button viewPrefsBtn = FindViewById<Button>(Resource.Id.BtnViewPrefs);
Button button = FindViewById<Button>(Resource.Id.MyButton);
button.Click += delegate
{
if (eTextCarNum.Text != "" && eTextPassword.Text != "" && eTextUsername.Text != "")
{
DriverLogon driver = new DriverLogon();
driver.userName = eTextUsername.Text;
driver.password = eTextPassword.Text;
driver.carNum = eTextCarNum.Text;
DriverLogonAsync asyDriver = new DriverLogonAsync(this, driver);
asyDriver.Execute();
}
};
viewPrefsBtn.Click += (sender, e) =>
{
StartActivity(typeof(PreferencesActivity));
};
}
}
}
So when user is successfully logged in "driverId" should be saved and can be retrived from main activity when re launching app.
Main Activity Code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using Android.Preferences;
using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using RestSharp;
using Android.Locations;
using TheNorthStar.Api.Requests;
using TheNorthStar.Api.Results;
using NorthStar.Driver.Application;
using System.Timers;
using AutoMapper;
using Object = Java.Lang.Object;
using Timer = System.Timers.Timer;
namespace NorthStar.Driver
{
[Activity(Label = "Home")]
public class MainActivity : Activity
{
string m_driverId;
string m_bookingId;
string m_address;
int i = 1;
private Timer _requestWorkTimer;
/*
* throws
*/
private void SetDriverStatues(string status)
{
m_driverId = Intent.GetStringExtra("driverID");
var api = new ConnectToSever(Helper.GetServer(ApplicationContext));
DriverLogon driver = new DriverLogon();
//Booking booking = RequestToSever();
driver.driverID = Int32.Parse(m_driverId);
driver.driverStatus = status;
try
{
api.SetDriverStatus(driver);
}
catch
{
Android.Util.Log.Info("EXC_setdstat1", "set driver status failed");
throw;
}
}
protected override void OnDestroy()
{
base.OnDestroy();
_requestWorkTimer.Stop();
}
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
SetContentView(Resource.Layout.Mainpage);
//EditText messageBox = FindViewById<EditText>( Resource.Id.MessagesBox );
Button button = FindViewById<Button>(Resource.Id.LogOutButton);
m_driverId = Intent.GetStringExtra("driverID");
var service = new Intent(this, typeof(NorthStarBackgroundService));
service.PutExtra("driverId",m_driverId);
StartService(service);
ThreadPool.QueueUserWorkItem(state => SetDriverStatues("Available"));
// this.SetDriverStatues( "Available" );
_requestWorkTimer = new Timer(15000);
_requestWorkTimer.Elapsed += (sender, e) =>
{
ThreadPool.QueueUserWorkItem(x => RequestWork());
};
_requestWorkTimer.Start();
button.Click += (sender, args) =>
{
try
{
SetDriverStatues("Logoff");
}
catch
{
Android.Util.Log.Info("EXC_setdstat2", "set driver status failed");
return;
}
var mact = new Intent(this, typeof(Activity1));
mact.AddFlags(ActivityFlags.ClearTop);
StartActivity(mact);
};
}
private void CheckMessage()
{
/* if ( )
{
//timeout so return home
}
/* else
{
timerCount--;
RunOnUiThread(() => { jobTimerLabel.Text = string.Format("{0} seconds to respond", timerCount); });
}*/
}
protected override void OnResume()
{
base.OnResume();
_requestWorkTimer.Start();
}
private void CreateAlert()
{
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.SetTitle("GPS is Off")
.SetMessage("Do you want to go to settings menu?")
.SetPositiveButton("Setting",
(sender, e) =>
{
Intent intent = new Intent(Android.Provider.Settings.ActionLocationSourceSettings);
StartActivity(intent);
this.Finish();
})
.SetNegativeButton("No", (sender, e) => this.Finish());
AlertDialog alert = builder.Create();
alert.Show();
}
/*
* throws
*/
private void RequestWork()
{
_requestWorkTimer.Stop();
var api = new ConnectToSever(Helper.GetServer(ApplicationContext));
DriverMoreWorkRequest driver = new DriverMoreWorkRequest();
driver.driverID = Int32.Parse(m_driverId);
NorthStarBackgroundService n = new NorthStarBackgroundService();
driver.Lat = n.currentLattitude;
driver.Lng = n.currentLongtitude;
Object result; Booking booking;
try
{
result = api.RequestWork(driver);
}
catch
{
Android.Util.Log.Info("EXC_reqwork1", "request work failed");
throw;
}
try
{
booking = Newtonsoft.Json.JsonConvert.DeserializeObject<Booking>(result.ToString());
}
catch (Exception ex)
{
Android.Util.Log.Info("EXC_reqwork1", "deserialize request work failed\n" + ex.Message);
throw;
}
if (booking != null)
{
m_bookingId = booking.BookingId.ToString();
//string add = api.GetCustomerAddress(booking);
RunOnUiThread(() =>
{
var mact = new Intent(this, typeof(NewWorkAvailableActivity));
mact.PutExtra("driverID", m_driverId);
mact.PutExtra("bookingId", m_bookingId);
mact.PutExtra("fullAddress", booking.Address);
mact.PutExtra("jobLocation", booking.PickupSuburb);
mact.PutExtra("customerPhoneNumber", booking.PassengerPhoneNumber);
StartActivity(mact);
});
}
else
{
_requestWorkTimer.Start();
}
}
public object even { get; set; }
}
}

I'm exactly sure what you are trying to do here but to get driver ID from Shared Preferences try (from the login activity):
var prefs = GetSharedPreferences("MyApp",Android.Content.FileCreationMode.Private);
var driverID = 0;
if (prefs.Contains("DriverID"))
{
driverID = prefs.GetInt("DriverID", 0);
}
else
{
//Call the Async Task to get the Driver or whatever and when you've got it:
var prefsEdit = prefs.Edit();
prefsEdit.PutInt("DriverID", driver.ID);
prefsEdit.Commit();
driverID = prefs.GetInt("DriverID", 0);
}
var mact = new Intent(this, typeof(MainActivity))
.PutExtra("driverID", driverID);
StartActivity(mact);
Alternatively I would stick the whole Driver object in a sqlite db and get it back every time you come in but obviously I don't know your requirements.

Saving user credentials on login

I am developing android application which requires user to Login. This application relies on web server to verify the user details so that user can logged in. My problem starts here, there is no problem for logging in user, but when ever user press home button and goes back to the app, login screen is displayed which is very bad.
I have heard of SharedPrefrences but i don't know how can i save user details using this, so that user can directly move to main activity.
I have included my source code here. If anybody familiar with SharedPrefrences can help me to solve this. Example with my cod will be helpful.
using System;
using Android.App;
using Android.Content;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;
using Android.Locations;
using RestSharp;
using TheNorthStar.Api.Requests;
using TheNorthStar.Api.Results;
using NorthStar.Driver.Application;
using Android.Preferences;
using Object = Java.Lang.Object;
namespace NorthStar.Driver
{
public class DriverLogonAsync : AsyncTask
{
private ProgressDialog processDialog;
private Context m_context;
private DriverLogon m_driver;
private bool _resterror;
public DriverLogonAsync( Context context, DriverLogon driver )
{
m_context = context;
m_driver = driver;
_resterror = false;
}
/*
* throws
* should separate out logic and use MyMessagebox..
*/
private void SetComfirmAlertBox(string carNum, DriverLogonResult result)
{
var api = new ConnectToSever(Helper.GetServer(m_context));
string resultOfCarDetail; CarDetails res;
try
{
resultOfCarDetail = api.ComfirmLogginOn(m_driver);
}
catch
{
Android.Util.Log.Info("EXC_conflogon1", "confirm logging on failed");
throw;
}
try
{
res = Newtonsoft.Json.JsonConvert.DeserializeObject<CarDetails>(resultOfCarDetail);
}
catch (Exception ex)
{
Android.Util.Log.Info("EXC_conflogon2", "deserialize confirm logging on failed\n" + ex.Message);
throw;
}
if (res.carExists != true)
{
MyMessageBox.SetAlertBox("Opps!!!!!!!!", "This Car Number Was Wrong!!!!", "OK", m_context);
}
else
{
string carType = res.carType;
string seatNum = res.numOfSeats.ToString();
// MainActivity act = new MainActivity( result.driverId );
var mact = new Intent(m_context,typeof(MainActivity) );
mact.PutExtra( "driverID", result.driverId.ToString() );
MyMessageBox.SetAlertBox("Comfirm!", "Your car is a: " + carType + " with " + seatNum + " seats??", "Yes", "No", mact,m_context);
}
}
/*private void ChangeDriverStatues()
{
}*/
protected override void OnPreExecute()
{
base.OnPreExecute();
processDialog = ProgressDialog.Show( m_context, "Driver Loging On...", "Please Wait...", true, true);
}
protected override Object DoInBackground(params Object[] #params)
{
var api = new ConnectToSever(Helper.GetServer(m_context));
string res = string.Empty;
try
{
res = api.DriverLogingOn(m_driver);
}
catch
{
_resterror = true;
Android.Util.Log.Info("EXC_dlogon1", "driver logon failed");
return -1;
}
return res;
}
protected override void OnPostExecute(Object result)
{
base.OnPostExecute(result);
//hide and kill the progress dialog
processDialog.Hide();
processDialog.Cancel();
if (_resterror == true)
{
Android.Util.Log.Info("EXC_dlogon2", "logon connection has failed, noop");
return;
}
DriverLogonResult resDriverDetail;
try
{
resDriverDetail = Newtonsoft.Json.JsonConvert.DeserializeObject<DriverLogonResult>(result.ToString());
}
catch (Exception ex)
{
Android.Util.Log.Info("EXC_dlogon3", "logon deser has failed, noop\n" + ex.Message);
return;
}
if (resDriverDetail.logonSuccess)
{
this.SetComfirmAlertBox( m_driver.carNum, resDriverDetail );
}
else
{
MyMessageBox.SetAlertBox("Wrong!", "Wrong username or password!!!", "OK!",m_context);
}
}
}
[Activity(Label = "MyDriver-Driver", MainLauncher = true, Icon = "#drawable/icon")]
public class Activity1 : Activity
{
private void CreateAlert()
{
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.SetTitle("GPS is Off")
.SetMessage("You need GPS to you this application."+ "\n" +
"Do you want to go to settings menu?")
.SetPositiveButton("Setting",
(sender, e) =>
{
Intent intent = new Intent(Android.Provider.Settings.ActionLocationSourceSettings);
StartActivity(intent);
this.Finish();
})
.SetNegativeButton("No", (sender, e) => this.Finish());
AlertDialog alert = builder.Create();
alert.Show();
}
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.Main);
Android.Util.Log.Info("EXC_logstart", "**************** starting driver module ****************");
Boolean isGPSEnabled = false;
Boolean isNetworkEnabled = false;
LocationManager _locationManager;
_locationManager = (LocationManager)GetSystemService(LocationService);
isGPSEnabled = _locationManager.IsProviderEnabled(LocationManager.GpsProvider);
// getting network status
isNetworkEnabled = _locationManager.IsProviderEnabled(LocationManager.NetworkProvider);
if (!isGPSEnabled && !isNetworkEnabled)
{
CreateAlert();
}
// Get our button from the layout resource,
// and attach an event to it
EditText eTextUsername = FindViewById<EditText>(Resource.Id.UserNameBox);
EditText eTextPassword = FindViewById<EditText>(Resource.Id.PasswordBox);
EditText eTextCarNum = FindViewById<EditText>(Resource.Id.CarNumBox);
Button viewPrefsBtn = FindViewById<Button>(Resource.Id.BtnViewPrefs);
Button button = FindViewById<Button>(Resource.Id.MyButton);
button.Click += delegate
{
if (eTextCarNum.Text != "" && eTextPassword.Text != "" && eTextUsername.Text != "")
{
DriverLogon driver = new DriverLogon();
driver.userName = eTextUsername.Text;
driver.password = eTextPassword.Text;
driver.carNum = eTextCarNum.Text;
DriverLogonAsync asyDriver = new DriverLogonAsync(this, driver);
asyDriver.Execute();
}
};
viewPrefsBtn.Click += (sender, e) =>
{
StartActivity(typeof(PreferencesActivity));
};
}
}
}

public void savePrefrences(String key, String value)
{
SharedPreferences prefs = context.getSharedPreferences(context.getApplicationContext().getPackageName(), 0);
prefs.edit().putString(key, value).commit();
}
public String getPrefrences(String key)
{
SharedPreferences prefs = context.getSharedPreferences(context.getApplicationContext().getPackageName(), 0);
return prefs.getString(key, "");
}
This way your info will be available from anywhere in the app even after you close and reopen it.
On your login screen - when a user does a successful login call savePrefrences("hasLoggenInPref", "true");
Now, whenever the user reenters the login screen - call getPrefrences("hasLoggenInPref") and check if its equals "true", if so, jump to your main screen, if not, show the login screen.
You should probably call the getPrefrences function from a splash screen or something and if it returns true open your app, and if not, open the login screen.
When a user logs out just call savePrefrences("hasLoggenInPref", "false");
Hope this helps.

Not sure about monodroid, but generally in your application all Activities which requare authorization must be subclassed from one activity which checks in onResume that the user has valid session (You store flag about successfully login or session id after login in memory, for instance in your Application class or any appropriate singleton). Then
if check failed - return user to login screen
if successfull - do nothing, just show them activity what he wants
To avoid problem with activity stack (pressing home button returns to login screen) and remove LoginActivity from it use android:noHistory="true" inside your manifest or related property via Intent