之间有什么diffirence的 @id / 和 @ + / ID ？

What is the diffirence between the @id/ and @+/id?

由于在 @ + ID / ：+（加号）符号表示，我们正在创造新的资源名称，它必须是创建并加入 R.java 文件，但怎么样的 @id / ？由于从 标识的文件 引用一个Android资源ID时，你不需要加符号，但必须加上Android包名称空间，像这样：

As in the @+id/ : The + (plus) symbol indicates that we are creating the new resource name and it must be created and added in to our R.java file but what about the @id/? As from the documentation of ID when referencing an Android resource ID, you do not need the plus-symbol, but must add the android package namespace, like so:

android:id="@android:id/list"

但在下面的图片日食忽略了最低暗示我什么样的的@android：ID /

是 @id / 和 @android：ID 一样吗？

我真的AP preciate你的任何想法有一个精心制作的例子。

I would really appreciate any of your ideas with an elaborate example.

推荐答案

您参考安卓资源，这是在Android系统已经定义， @android：ID /..，而在你的项目中创建已定义的接入资源/，可以使用 @id /..

you refer to Android resources , which are already defined in Android system, with @android:id/.. while to access resources that you have defined/created in your project, you use @id/..

更多信息

按照在聊天你澄清，你说你有一个这样的问题：

As per your clarifications in the chat, you said you have a problem like this :

如果我们使用机器人：ID =@ ID / layout_item_id这是行不通的。相反 @ + ID / 工作有啥区别就在这里？这是我原来的问题。

If we use android:id="@id/layout_item_id" it doesn't work. Instead @+id/ works so what's the difference here? And that was my original question.

嗯，这取决于上下文，当你使用的XML属性机器人：ID ，那么你指定一个新的ID，并指示解析器（或称之为生成器）创建于 R.java 新条目，因此，你必须包括 + 标志。

Well, it depends on the context, when you're using the XML attribute of android:id, then you're specifying a new id, and are instructing the parser (or call it the builder) to create a new entry in R.java, thus you have to include a + sign.

而在其他情况下，如安卓layout_below =@ ID / myTextView，你指的是已经创建了一个ID，所以解析器链接这在已创建的ID R.java 。

While in the other case, like android:layout_below="@id/myTextView" , you're referring to an id that has already been created, so parser links this to the already created id in R.java.

更多信息再次

正如你在聊天说，请注意，安卓layout_below =@ ID / myTextView将无法识别ID为元素 myTextView 如果你使用它的元素之后写的。

As you said in your chat, note that android:layout_below="@id/myTextView" won't recognize an element with id myTextViewif it is written after the element you're using it in.