如何将Spinner默认值设置为null? [英] How to set Spinner default value to null?

问题描述

我正在尝试使Spinner加载而没有选定的值.用户选择一个值后，它将带他们到另一个页面.

I'm trying to get a Spinner to load up with no selected value. Once the user selects a value it then takes them to another page.

这被证明是一个问题，因为当前页面只是在用户获得选择权之前立即加载.

This is proving to be a problem because at present, the page just loads straight away before the user gets a choice to choose.

我的Spinner类的设置方法与Google的设置方法相同: http://developer.android.com/resources/tutorials/views/hello-spinner.html

My spinner class is set up the same way as Google's: http://developer.android.com/resources/tutorials/views/hello-spinner.html

因此，基本上，是否有可能在不选择任何内容的情况下加载微调器，因为当前它会加载我的字符串数组中的第一项.

So basically, is it possible have a spinner that loads with nothing selected because at present, it loads the first item in my string array.

推荐答案

是否有可能在不选择任何内容的情况下加载微调器

is it possible have a spinner that loads with nothing selected

仅当没有数据时.如果SpinnerAdapter中有1个以上的项目，则Spinner始终会有一个选择.

Only if there is no data. If you have 1+ items in the SpinnerAdapter, the Spinner will always have a selection.

Spinners并非设计为命令窗口小部件.用户不会期望在Spinner中进行选择来启动活动.请考虑使用其他内容，例如ListView或GridView，而不是Spinner.

Spinners are not designed to be command widgets. Users will not expect a selection in a Spinner to start an activity. Please consider using something else, like a ListView or GridView, instead of a Spinner.

编辑

顺便说一句，我忘了提到-您总是可以在适配器中添加一个表示无选择"的额外条目，并将其作为Spinner中的初始选定项.

BTW, I forgot to mention -- you can always put an extra entry in your adapter that represents "no selection", and make it the initial selected item in the Spinner.

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