Android - départ de nouvelle Activité (java.lang.NullPointerException)

bonjour, j'ai essayé le SharedPreferences Classe et j'ai créé deux classes, "TestingActivity", l'extension android.app.Activité et AccountSettings avec deux fonctions statiques de définir et de récupérer une CLÉ de SharedPreferences.

Je vais avoir cette erreur lors de l'exécution de l'Intention de l'activité principale:

   01-12 17:18:47.890: E/AndroidRuntime(5539): FATAL EXCEPTION: main
01-12 17:18:47.890: E/AndroidRuntime(5539): java.lang.RuntimeException: Unable to    start activity ComponentInfo{es.LandeSoft/es.LandeSoft.TestingActivity}:   java.lang.NullPointerException
01-12 17:18:47.890: E/AndroidRuntime(5539):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651)
01-12 17:18:47.890: E/AndroidRuntime(5539):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
01-12 17:18:47.890: E/AndroidRuntime(5539):     at android.app.ActivityThread.access$1500(ActivityThread.java:117)
01-12 17:18:47.890: E/AndroidRuntime(5539):     at     android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
01-12 17:18:47.890: E/AndroidRuntime(5539):     at android.os.Handler.dispatchMessage(Handler.java:99)
01-12 17:18:47.890: E/AndroidRuntime(5539):     at android.os.Looper.loop(Looper.java:130)
01-12 17:18:47.890: E/AndroidRuntime(5539):     at android.app.ActivityThread.main(ActivityThread.java:3691)
01-12 17:18:47.890: E/AndroidRuntime(5539):     at java.lang.reflect.Method.invokeNative(Native Method)
01-12 17:18:47.890: E/AndroidRuntime(5539):     at java.lang.reflect.Method.invoke(Method.java:507)
01-12 17:18:47.890: E/AndroidRuntime(5539):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:907)
01-12 17:18:47.890: E/AndroidRuntime(5539):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:665)
01-12 17:18:47.890: E/AndroidRuntime(5539):     at dalvik.system.NativeStart.main(Native Method)
01-12 17:18:47.890: E/AndroidRuntime(5539): Caused by: java.lang.NullPointerException
01-12 17:18:47.890: E/AndroidRuntime(5539):     at es.LandeSoft.TestingActivity.onCreate(TestingActivity.java:30)
01-12 17:18:47.890: E/AndroidRuntime(5539):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
01-12 17:18:47.890: E/AndroidRuntime(5539):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)
01-12 17:18:47.890: E/AndroidRuntime(5539):     ... 11 more

Im le début de l'activité à partir de l'Activité principale lanceur avec ce code:

Intent intent= new Intent(this,TestingActivity.class);
startActivity(intent);</i>

L'Activité de la Classe est vraiment simple et c'est le suivant:
package es.LandeSoft;

  import es.LandeSoft.R;
import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class TestingActivity extends Activity {
TextView lblDatos=null;
EditText DatosAGuardar =null;
@Override
protected void onCreate(Bundle savedInstanceState) {
//TODO Auto-generated method stub
super.onCreate(savedInstanceState); 
Button botonGuardar = (Button) findViewById(R.id.btnGuardar);
Button botonRecuperar = (Button) findViewById(R.id.btnRecuperar);
lblDatos = (TextView) findViewById(R.id.textView1);
DatosAGuardar= (EditText) findViewById(R.id.txtPref);
botonGuardar.setOnClickListener(new OnClickListener() {         
@Override
public void onClick(View v) {               
AccountSettings.SavePassword(getApplicationContext(),"PASSWORD_APP",DatosAGuardar.getText().toString());
ShowToast("Se ha guardado el password: " + DatosAGuardar.getText().toString() , 2500);
}
});
botonRecuperar.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
//TODO Auto-generated method stub
String clave= AccountSettings.GetPassword(getApplicationContext(), "PASSWORD_APP");
lblDatos.setText(clave);
ShowToast("Clave Recuperada: " + clave,2000);
}
});
}
private void ShowToast(String MessageT, int Duracion)
{
Toast miTostada= new Toast(getApplicationContext());
miTostada.setText(MessageT);
miTostada.setDuration(Duracion);
miTostada.setGravity(Gravity.CENTER,0,0);
miTostada.show();
}
}
**The AccountSettings.java is the following:**
package es.LandeSoft;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
public class AccountSettings {
public static String GetPassword (Context Contexto, String Key)
{   
SharedPreferences savedSession=        Contexto.getSharedPreferences(Key,Context.MODE_PRIVATE);
return  savedSession.getString(Key, null);      
}
public static void SavePassword(Context context, String Key, String Value)
{
Editor editor = context.getSharedPreferences(Key,Context.MODE_PRIVATE).edit();
editor.putString(Key, Value);           
}
}

La TestingActivity XML est le suivant:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/TextViewInfo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/TextViewInfo_Text" />
<EditText
android:id="@+id/txtPref"
android:inputType="text"        
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<requestFocus />
</EditText>
<Button
android:id="@+id/btnGuardar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/btn_guardar" />
<Button
android:id="@+id/btnRecuperar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/btn_recuperar" />
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</LinearLayout>

et Le Manifeste Android:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="es.LandeSoft"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="8" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> 
<uses-permission android:name="android.permission.UPDATE_DEVICE_STATS"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.INTERNET"/>
<application android:label="@string/app_name"
android:debuggable="true" 
android:icon="@drawable/landesofticon">
<activity android:name="es.LandeSoft.LandeSoftActivity"
android:label="@string/app_name">                   
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="es.LandeSoft.FacebookClass"></activity>
<activity android:name="es.LandeSoft.TestingActivity"></activity>
</application>
</manifest>

Je ne comprends pas pourquoi la Méthode OnCreate est en panne, quelqu'un peut-il me donner un indice?
Merci à l'avance!