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我正在開發需要用戶登錄的android應用程序。此應用程序依賴於Web服務器來驗證用戶的詳細信息，以便用戶可以登錄。我的問題從這裏開始，登錄用戶沒有問題，但是當用戶按回家鍵並返回到應用程序時，顯示登錄屏幕這是非常糟糕的。登錄時保存用戶憑證
我聽說過SharedPrefrences，但我不知道如何使用此保存用戶詳細信息，以便用戶可以直接移動到主要活動。
我已將我的源代碼包含在這裏。如果有人熟悉SharedPrefrences可以幫助我解決這個問題。我的鱈魚例子會有幫助。
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));
};
}
}
}
可以請您指教我如何在上下文中將此實現到我的應用程序。這真的會幫助我。 –
編輯我的答案。 – Givi