Android AlertDialog 设置setSingleChoiceItems不显示列表的原因【setMessage和setSingleChoiceItems不能同时使用】

今日写了个如题目的简单功能，结果列表不显示

无奈重写了一次代码发现setMessage和setSingleChoiceItems不能同时使用。

正确的如下：

private void mobilePhone(){

        AlertDialog.Builder builder = new AlertDialog.Builder(HomePageChildrenActivity.this.getParent());

        if(children_Data.schoolbean.schType.equals("K")){//幼儿园

            List<FriendsBean> teacherlist = new ArrayList<FriendsBean>();

            for(int i=0;i<children_Data.friends.size();i++){

                if(children_Data.friends.get(i).getUsertype().equals("T")){

                    teacherlist.add(children_Data.friends.get(i));

                }

            }

            String[] teachers = new String[teacherlist.size()] ; 

            for(int i=0;i<teacherlist.size();i++){

                teachers[i]=teacherlist.get(i).getUserneme();

            }

            ButtonOnClick buttonOnClick = new ButtonOnClick(0,teacherlist);

            builder.setTitle("请选择教师");

            builder.setSingleChoiceItems(teachers, 0,buttonOnClick);

            builder.setPositiveButton("确认",buttonOnClick);

            builder.setNegativeButton("取消",buttonOnClick);

        }else{

            builder.setMessage("确认拨打"+app.CurrentChildren.childrenName+"的班主任老师电话吗？");

            builder.setTitle("提示");

            builder.setPositiveButton("确认", new DialogInterface.OnClickListener() {

                @Override

                public void onClick(DialogInterface dialog, int which) {

                    Intent intent = new Intent();

                    intent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:"+children_Data.TeaherBean.getMobilePhone()));

                    startActivity(intent);

                    dialog.dismiss();

                }

            });



            builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {



                @Override

                public void onClick(DialogInterface dialog, int which) {



                    dialog.dismiss();

                }

            });

        }

        builder.show();

    }