AlertDialog:为什么我不能同时显示Message和List? [英] AlertDialog: Why can't I show Message and List together?

问题描述

有人知道为什么当我添加带有.setMessage()的消息时AlertDialog不显示项目列表吗? 将会显示负号和正号按钮，但不会显示列表. 当我用.setMessage()删除行时，一切正常.

Does anybody know why the AlertDialog doesn't show the list of items when I add a Message with .setMessage()? The negative and positive buttons will be shown, but not the list. When I delete the line with .setMessage() everything works.

这是我的代码:

AlertDialog.Builder myAlertDialog = new AlertDialog.Builder(this.getActivity());
myAlertDialog.setTitle("Options");
myAlertDialog.setMessage("Choose a color.");

CharSequence[] items = {"RED", "BLUE", "GREEN" };

myAlertDialog.setSingleChoiceItems(items, -1, new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
        // do stuff
    }
});

myAlertDialog.setNegativeButton("NO",new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
       // do stuff
    }
});

myAlertDialog.setPositiveButton("YES",new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
       // do stuff
    }
});

myAlertDialog.create();
myAlertDialog.show();

推荐答案

来自文档，

由于该列表显示在对话框的内容区域中，因此该对话框无法同时显示消息和列表，因此您应该使用setTitle()设置对话框的标题.

Because the list appears in the dialog's content area, the dialog cannot show both a message and a list and you should set a title for the dialog with setTitle().

因此setMessage()和setSingleChoiceItems()是互斥的.

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