在我的应用程序中，用户需要登录才能访问该应用程序。我的问题是当用户从主要活动中按下返回键时，用户被发送回登录屏幕。
我知道我可以覆盖 ht OnBackPressed() 但这并不能解决我的问题。如果我覆盖 OnBackPressed() 并将用户发送到主屏幕，当用户再次打开应用程序时，用户将返回登录屏幕。即使用户已经显示登录屏幕，用户在后台登录。所以为了进入主要活动，用户需要再次登录。
我试过 Finish() 但单声道机器人显示错误。
我已附上我的登录活动代码。有人可能会让我摆脱这个问题。
using System;
using Android.App;
using Android.Content;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;
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
{
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 ****************");
// 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));
};
}
}
}