什么是“点"?用于注册活动时 [英] What's the "dot" for when registering an Activity

问题描述

我对 Android 操作系统编程有点菜鸟.我注意到在我读过的书中，作者在清单中注册他们的活动时在活动名称前放置了一个点".我环顾了 Android 开发人员网站，但不明白为什么我们需要点".点"实际上是否有目的?我需要吗?我在下面包含了一个例子.注意NewActivity"之前的点":

I'm kind of a noob at programming for the Android OS. I noticed in the books I have been reading that the authors have placed a "dot" in front of the activity name when registering their activities in the manifest. I've looked around the Android developer site and I can't figure out why we need the "dot". Does the "dot" actually server a purpose? Do I need it? I have included an example below. Notice the "dot" before "NewActivity":

<activity android:name=".NewActivity"></activity>

推荐答案

正如您所注意到的，这一点不是必需的，但它基本上意味着:活动类位于应用程序的同一个包中.因此，如果您的应用程序包是:com.my.package 那么:

As you have noticed the point is not necessary but it basically means: the activity class lives in the same package of the app. So, if your app package is: com.my.package then:

• .YourActivity 表示您的类在 com.my.package 内.
• YourActivity 表示你的类在 com.my.package 内(同上).
• .activities.YourActivity 表示您的课程在 com.my.package.activities 内.
• 您甚至可以执行以下操作:com.my.package.activities.YourActivity 当您希望拥有不同版本的应用程序并使用 Ant 自动更改对包的引用时，这很有用.

• .YourActivity means that your class is inside com.my.package.
• YourActivity means that your class is inside com.my.package (same as above).
• .activities.YourActivity means that your class is inside com.my.package.activitites.
• You can even do something like: com.my.package.activities.YourActivity which is useful when you want to have different versions of your app and use Ant to change the references to the package automatically.

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