android中的单选选择对话框

我正在制作一个 Android程序.在我的应用程序中,我使用单选项AlertDialog,其项目以编程方式添加.我想做的是：

>下次用户打开对话框时,为所选项目设置背景颜色,
>在对话框中间显示所选项目(这是一个问题,因为大约有20个项目).

这就是我所拥有的：XML：

<?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://scheR_369_11845@as.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:orientation="vertical" >

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingTop="5dp" >



    <Button
        android:id="@+id/SELEctDateButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Please,SELEct date" />

</LinearLayout>

JAVA：

public class ExperimentListView extends Activity {

private static final DateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd");
private static Calendar calendar = Calendar.geTinstance();
private static Button SELEctDateButton;
private static String[] items;
private stati@R_772_8592@ SELEctedDatePosition = 0;

@Override
protected void onCreate(Bundle savedInstanceStatE) {
    super.onCreate(savedInstanceStatE);
    setContentView(R.layout.list_view_eX);

    SELEctDateButton = (Button)findViewById(R.id.SELEctDateButton);
    SELEctDateButton.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            items = new String[20];
            for (int i = 0; i < 20; i++) {
                items[i] = DATE_FORMAT.format(calendar.getTime());
                calendar.add(Calendar.DATE,1);
            }
            showListView();
        }
    });

}

private void showListView() {
    AlertDialog.builder builder = new AlertDialog.builder(ExperimentListView.this);
    builder.settitle("SELEct date");
    builder.setItems(items,new DialogInterface.onClickListener() {
        @Override
        public void onClick(DialogInterface dialog,int which) {
            SELEctedDatePosition = which;
            SELEctDateButton.setText(items[SELEctedDatePosition]);
        }
    });
    AlertDialog alertDialog = builder.create();
    alertDialog.getListView().setSELEction(SELEctedDatePosition);
    alertDialog.show();
 }
}

到目前为止,我还没有找到@L_674_6@案,如果有人可以提供帮助,我将不胜感激.
提前致谢.

builder.setSingleChoiceItems(strArray,SELEcted_pos,new DialogInterface.onClickListener ()
    {
         @Override
         public void onClick(DialogInterface dialog,int which) 
         {

         }
    });