android中的单选选择对话框

Question

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://schemas.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 static int 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,我还没有找到解决方案,如果有人可以提供帮助,我将不胜感激.提前致谢.

Answer 1

而不是使用builder.setItem作为builder.setSingleChoiceItems参数传递的选定项目位置，例如

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

         }
    });