public override void initListner ()
{
//set edittext listener
mClearEditText.AddTextChangedListener (new MyTextChangedListener (this));
//set item click listener
sortListView.ItemClick += delegate(object sender, AdapterView.ItemClickEventArgs e) {
SortModel user = sourceDateList [e.Position];
if (user.ScreenCount > 0) {
Intent intent = new Intent (this, typeof(TextActivity));
intent.PutExtra ("lesson_id", user.LessonId);
intent.PutExtra ("lesson_name", user.Name);
StartActivity (intent);
} else {
DialogFactory.ToastDialog (this, "Empty lesson", "Oops,this lesson has not uploaded yet!", 0);
}
};
}