AlertDialog.Builder ab = new AlertDialog.Builder(Demo1.this);
         ab.setTitle("请选择");
         ab.setIcon(android.R.drawable.ic_dialog_info);                
         ab.setSingleChoiceItems(new String[] {"选项1","选项2","选项3","选项4"}, 0, 
           new DialogInterface.OnClickListener() {                                     
              public void onClick(DialogInterface dialog, int which) {
                 dialog.dismiss();
              }
           }
         );
         ab.setNegativeButton("取消", null);
         ab.show();
  }