OnItemSelectedListener不适用于微调器

我有一个使用自定义ArrayAdapter设置的微调器:

I have a spinner which I have set up using a custom ArrayAdapter:

    private static class CustomAdapter<T> extends ArrayAdapter<String> {
    public CustomAdapter(Context context, int textViewResourceId, String[] objects) {
        super(context, textViewResourceId, objects);
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        View view = super.getView(position, convertView, parent);
        TextView textView = (TextView) view.findViewById(android.R.id.text1);
        textView.setText("");
        return view;
    }       

它的初始化方式如下(Spinner spinner；上面的语句作为类变量):

It is initialized as follows (the Spinner spinner; statement is up above as a class variable):

    this.spinner = (Spinner) findViewById(R.id.spinner1);
    CustomAdapter<String> adapter = new CustomAdapter<String>(this, 
        android.R.layout.simple_spinner_dropdown_item, new String[] {"Set Homepage"});

    spinner.setAdapter(adapter);
    spinner.setOnItemSelectedListener(this);

我已经实现了OnItemSelectedListener:

I have implemented the OnItemSelectedListener:

public class MainActivity extends Activity implements OnItemSelectedListener{...}

并具有必需的回调:

    //spinner methods
@Override
public void onItemSelected(AdapterView<?> parent, View view, 
        int pos, long id) {
    // TODO Auto-generated method stub
    //if (pos == 1){
        Toast.makeText(this, "Person wants to change the homepage", Toast.LENGTH_SHORT).show();
    //}
}

@Override
public void onNothingSelected(AdapterView<?> parent) {
    // TODO Auto-generated method stub
    //Toast.makeText(this, "Person wants to change the homepage", Toast.LENGTH_SHORT).show();

}

微调器的xml:

            <Spinner
            android:id="@+id/spinner1"
            android:layout_width="45dp"
            android:layout_height="45dp"
            android:background="@drawable/ic_menu_moreoverflow_holo_dark" />

问题是，无论何时从微调器中选择一个项目，即使我删除了所有条件(如上所示)，也没有任何反应.

The problem is, whenever an item is selected from the spinner, nothing at all happens, even after I removed all conditions as you can see above.