Android - 应用程序 onCreate 方法 - 它总是先被调用吗？

Question

我正在准备我的一个应用程序的新版本，并且我对我的应用程序进行了如此巨大的更改，以至于我需要在更新应用程序之后进行一些数据转换，这绝对是第一件事(在做任何其他事情之前)。我发现，最好的地方是在我的类(扩展应用程序)的 onCreate() 方法中。我测试了几次，它似乎工作正常，但后来我阅读了文档:

Base class for those who need to maintain global application state. You can provide your own implementation by specifying its name in your AndroidManifest.xml's tag, [b]which will cause that class to be instantiated for you when the process for your application/package is created[/b].

看起来我是对的，但我不太确定。你能确认/反驳吗？

Answer 1

Application 构造函数将首先被调用。然后将调用 Application::onCreate() 方法。我知道的唯一异常(exception)是如果应用程序包含一个 ContentProvider，它可以在应用程序之前接收调用。

来自这里:http://developer.android.com/reference/android/app/Application.html#onCreate()

public void onCreate ()

Added in API level 1 Called when the application is starting, before any activity, service, or receiver objects (excluding content providers) have been created. Implementations should be as quick as possible (for example using lazy initialization of state) since the time spent in this function directly impacts the performance of starting the first activity, service, or receiver in a process. If you override this method, be sure to call super.onCreate().