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i use Intent to put extra and get extra on activity but next time data of get extra is data of first put extra (sorry my english is bad)

ex: first time: i put 18001090 and i receive : 18001090
second time: i put 056113 but i receive : 18001090
I put extra
Intent notificationIntent = new Intent(context, typeof(MainActivity));
notificationIntent.SetAction("android.intent.action.MAIN");
notificationIntent.PutExtra("number", incomingNumber);
On MainActivity
var number = this.Intent.GetStringExtra("number");

I use Intent to put extra and get extra, but I don't get the result as you, here is my code.
I add EditText and Button on layout5 and TextView on layout6.
Mainactivity:
private EditText edittext;
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.layout5);
btn1 = FindViewById<Button>(Resource.Id.button1);
edittext = FindViewById<EditText>(Resource.Id.edittext1);
btn1.Click += Btn1_Click1;
}
private void Btn1_Click1(object sender, EventArgs e)
{
Intent i = new Intent(this, typeof(Activity1));
//Add PutExtra method data to intent.
i.PutExtra("Name", edittext.Text.ToString());
//StartActivity
StartActivity(i);
}
Avtivity1:
private TextView text;
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.layout6);
// Create your application here
string name = Intent.GetStringExtra("Name");
text = FindViewById<TextView>(Resource.Id.textview1);
text.Text = name;
Log.Debug("123" ,name);
}

Loading a string into a textview

I need to load a string into a textview that is being displayed on a new page after a button click event. A java.lang.runtimeexception keeps getting thrown when i click the button. "java.lang.reflect.InvocationTargetException"
Here is that section of my code:
SetContentView (Resource.Layout.Main);
Button button1 = FindViewById<Button>(Resource.Id.story1);
button1.Click += delegate {
SetContentView (Resource.Layout.next1);
TextView textvtest = (TextView) FindViewById(Resource.Id.textView1);
textvtest.Text = "test";
};

From the first activity, in buttonClick :
button1.Click += delegate {
var activity2 = new Intent (this, typeof(Activity2));
activity2.PutExtra ("MyData", "test");
StartActivity (activity2);
};
In the second activity, in onCreate() :
protected override void OnCreate (Bundle bundle)
{
SetContentView (Resource.Layout.next1);
TextView textvtest = (TextView) FindViewById(Resource.Id.textView1);
string text = Intent.GetStringExtra ("MyData") ?? "Data not available";
textvtest.Text = text;
}

I don't know if this matters, but other examples of setting textviews with C# include
(object sender, EventArgs e)
after
delegate
like
delegate(object sender, EventArgs e)

your code was a little bit wrong, try this
SetContentView (Resource.Layout.Main);
Button button1 = FindViewById<Button>(Resource.Id.story1);
button1.Click += delegate {
SetContentView (Resource.Layout.next1);
TextView textvtest = FindViewById<TextView>(Resource.Id.textView1);
textvtest.Text = "test";
};

2nd button will not work with event handler in Xamarin c# android app

MainActivity.cs
namespace testApp
{
[Activity (Label = "DHS HotKeys", MainLauncher = true, Icon = "#drawable/icon")]
public class MainActivity : Activity
{
protected override void OnCreate (Bundle bundle)
{
base.OnCreate (bundle);
// Set our view from the "main" layout resource
SetContentView (Resource.Layout.Main);
// Get our button from the layout resource,
// and attach an event to it
Button button1 = FindViewById<Button> (Resource.Id.button1);
Button button = FindViewById<Button> (Resource.Id.myButton);
button.Click += delegate {
var uri = Android.Net.Uri.Parse ("https://www.fridayparentportal.com/delran/");
var intent = new Intent (Intent.ActionView, uri);
StartActivity (intent);
};
button1.Click += (object sender, EventArgs e) => {
var uri2 = Android.Net.Uri.Parse ("http://dhs.delranschools.org/students/lunch_menu/");
var intent2 = new Intent (Intent.ActionView, uri2);
StartActivity (intent2);
};
}
}
}
Inside the resource designer:
public partial class Id
{
// aapt resource value: 0x7f050001
public const int button1 = 2131034113;
// aapt resource value: 0x7f050000
public const int myButton = 2131034112;
The 2nd button is set exactly like the first, but it does nothing when clicked, while the first one opens the webpage. The ID for 2nd button is #+id/button1
Thank you

write each button closer to their eventhandler, like this :
Button btn1 = FindViewById<Button>(Resource.Id.button1);
btn.Click += (object se,EventArgs e)
{
}

Set Language from Alert for Android (XAMARIN Studio)

I am building an app where user can select which Language he wants to set when the app starts. A pop up will show "Select your Language" with two buttons one for Arabic and the other one for English.
The problem is that when I change the locale and execute this line
SetContentView (Resource.Layout.Main);
the app broke. there is no error or any exception but all controls stop capturing the events. I tried to declare an Intent using this and this.Class and when I call StartActivity it is like restarting the whole app and the pop comes again to select the language. I am new to android development as I spent my last two years working on SAP Abap so I might ask a stupid question :D
here is my code
using System;
using Android.App;
using Android.Content;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;
namespace Khums
{
[Activity (Label = "Khums", MainLauncher = true, Icon = "#drawable/icon")]
public class MainActivity : Activity
{
protected override void OnCreate (Bundle bundle)
{
base.OnCreate (bundle);
// Set our view from the "main" layout resource
int r = Resource.Layout.Main;
SetContentView (Resource.Layout.Main);
var languageIso = "ar-SA";
AlertDialog.Builder alert = new AlertDialog.Builder (this);
//alert.SetTitle ("Selected Language");
AlertDialog alertDiaog = alert.Create ();
alertDiaog.SetTitle ("Select Language:");
alertDiaog.SetButton ("العربية", (s, EventArgs) => {
languageIso = "ar-SA";
var locale = new Java.Util.Locale(languageIso);
Java.Util.Locale.Default = locale;
var config = new Android.Content.Res.Configuration{Locale = locale };
BaseContext.Resources.UpdateConfiguration(config, BaseContext.Resources.DisplayMetrics);
//base.SetContentView(r);
//Intent intent = new Intent(this, this.Class);
//StartActivity(intent);
SetContentView (Resource.Layout.Main);
});
alertDiaog.SetButton2 ("English", (s, EventArgs) => {
languageIso = "en-US";
var locale = new Java.Util.Locale(languageIso);
Java.Util.Locale.Default = locale;
var config = new Android.Content.Res.Configuration{Locale = locale };
BaseContext.Resources.UpdateConfiguration(config, BaseContext.Resources.DisplayMetrics);
SetContentView (Resource.Layout.Main);
});
alertDiaog.Show();
Button button = FindViewById<Button> (Resource.Id.myButton);
RadioButton rb_FirstTime = FindViewById<RadioButton> (Resource.Id.radioButton1);
RadioButton rb_Regular = FindViewById<RadioButton> (Resource.Id.radioButton2);
EditText ti_lyearBalance = FindViewById<EditText> (Resource.Id.ti_lastBalance);
EditText ti_Balance = FindViewById<EditText> (Resource.Id.ti_Balance);
EditText ti_Clothes = FindViewById<EditText> (Resource.Id.ti_Clothes);
EditText ti_Food = FindViewById<EditText> (Resource.Id.ti_Food);
EditText ti_Perfumes = FindViewById<EditText> (Resource.Id.ti_Perfumes);
EditText ti_Subscriptions = FindViewById<EditText> (Resource.Id.ti_Subscriptions);
EditText ti_Others = FindViewById<EditText> (Resource.Id.ti_Others);
TextView lbl_lyearBalance = FindViewById<TextView> (Resource.Id.lbl_lastBalance);
rb_FirstTime.Click += RadioButtonHandler;
rb_Regular.Click += RadioButtonHandler;
button.Click += MyButtoHandler;
}
private void RadioButtonHandler(object sender, EventArgs e)
{
}
private void MyButtoHandler(object sender, EventArgs e)
{
}
private double calculateKhumus (double[] amounts, Boolean isRegular)
{
}
private void LangSwitchHndler(Object sender, EventArgs e)
{
}
}
}
can you please show me what I'm doing wrong here. I tried to use togglebutton instead of alert and also standard button but ends up with the same issue. Thank you.

It is solved after trying for two days. All I did is to create a menu and change the target framework to Android 3.1 Honeycomb. Then I just start the activity and everything is working fine.
So the issue was only target framework!

SharedPreferences value does not stick

I am trying to save a string to SharedPerferences like this:
Write
var prefs = Application.Context.GetSharedPreferences ("Janssen", FileCreationMode.WorldReadable);
var prefEditor = prefs.Edit ();
prefEditor.PutString ("SecurityToken", SecurityCode.Text);
prefEditor.Commit ();
Read
var prefs = Application.Context.GetSharedPreferences ("Janssen", FileCreationMode.WorldReadable);
var SecurityToken = prefs.GetString ("SecurityToken", null);
I am new to Android coming from iOS. I am trying to emulate NSUserDefaults in iOS. I am reading the SharedPreferences in a new activity, maybe that is what causes the problem? I am not sure. I also have no idea what to set as default value.

Are you re-deploying between writing your SharedPreferences and reading them? This often wipes the SharedPreferences.
I have just tested them and they work fine between two Activities:
WritePrefsAcitivity.cs
using Android.App;
using Android.Content;
using Android.Widget;
using Android.OS;
namespace Derrrp
{
[Activity (Label = "Derrrp", MainLauncher = true)]
public class WritePrefsActivity : Activity
{
protected override void OnCreate (Bundle bundle)
{
base.OnCreate (bundle);
SetContentView (Resource.Layout.Write);
var prefs = Application.Context.GetSharedPreferences("MySharedPrefs", FileCreationMode.Private);
var prefsEditor = prefs.Edit();
var ed = FindViewById<EditText>(Resource.Id.editText1);
ed.AfterTextChanged += (sender, e) => {
prefsEditor.PutString("MyPref", e.Editable.ToString());
prefsEditor.Commit();
};
Button button = FindViewById<Button> (Resource.Id.myButton);
button.Click += delegate {
var intent = new Intent(this, typeof(ReadPrefsActivity));
StartActivity(intent);
};
}
}
}
ReadPrefsActivity.cs
using Android.App;
using Android.Content;
using Android.OS;
using Android.Widget;
namespace Derrrp
{
[Activity (Label = "ReadPrefsActivity")]
public class ReadPrefsActivity : Activity
{
protected override void OnCreate (Bundle bundle)
{
base.OnCreate (bundle);
SetContentView(Resource.Layout.Read);
var tv = FindViewById<TextView>(Resource.Id.myTextView);
var button = FindViewById<Button>(Resource.Id.myButton);
var prefs = Application.Context.GetSharedPreferences("MySharedPrefs", FileCreationMode.Private);
button.Click += (sender, e) => {
tv.Text = prefs.GetString("MyPref", "");
};
}
}
}
The defValue can be set to anything you want. This is the value that will be chosen if the preference you are trying to get is empty.
NOTE: If you are using it to store some secret information it is advised to use FileCreationMode.Private and even use something that makes it only readable by the application, such as encryption.

I am not sure what is the error you have, but below is an example i used before for saving a string using shared preferences.
I used to set default value to "", so that while reading, if the value was not saved before, it will set the variable to empty string. You can read the shared preferences in any new activity , shared preferences is per application not activity ..
example:
writing string:
String pass = "abcdefg";
SharedPreferences preferences = getSharedPreferences("pref", 0);
SharedPreferences.Editor editor = preferences.edit();
editor.putString("savedPass", pass);
editor.commit();
reading string:
SharedPreferences preferences = getSharedPreferences("pref", 0);
String mypassword = preferences.getString("savedPass", "");