//saving
{
...
SharedPreferences myPrefs = this.getSharedPreferences("myPrefs", MODE_PRIVATE);
        SharedPreferences.Editor prefsEditor = myPrefs.edit();
        prefsEditor.putString(MY_NAME, "Sai");
        prefsEditor.putString(MY_WALLPAPER, "f664.PNG");
        prefsEditor.commit();
...
}

//retrieving
// when i call getData() I put "this" as argument.
public void getData(Context context){
    SharedPreferences myPrefs = context.getSharedPreferences("myPrefs", MODE_PRIVATE);
    ...
}