如何升级Froyo显示一个对话框顶部的主屏幕？ [英] How does Froyo display a Dialog atop the home screen?

问题描述

我用2.2（升级Froyo）一日前升级了我的Nexus。今天早上，当我去使用它，我看到一个对话框，上面坐着家庭/启动屏幕，通知我有更新可用，而且我可以选择现在或以后升级。

I upgraded my Nexus One a few days ago with 2.2 (Froyo). This morning when I went to use it I saw a Dialog sitting atop the home/launcher screen notifying me that an update was available and that I could choose to upgrade now or later.

我的问题是，什么样的API机制，这是用来显示一个对话框（也许是AlertDialog）之上的主屏幕？已经写了一个Android应用程序，这是我的理解是，对话框只能显示在上面活动，并且服务不能显示一个对话框（只有吐司）。

My question is, what API mechanisms is this using to show a Dialog (perhaps an AlertDialog) atop the home screen? Having written an Android app, it was my understanding that Dialogs could only be shown atop an Activity, and that a Service cannot show a Dialog (only a Toast).

时的谷歌也许是剥皮的活动看起来像一个对话框？是否有一个新的API方法可用于显示一个对话框，而无需一个活动？

Is Google perhaps skinning an Activity to look like a Dialog? Is there a new API method available for showing a Dialog without needing an Activity?

推荐答案

可以像主题的对话，一个活动的是有一段时间了（我认为1.6，甚至1.5）

You can theme an activity like the dialog, its been there for a while (i think 1.6, maybe even 1.5)

<activity android:name=".MyActivity" android:theme="@android:style/Theme.Dialog" />

这会产生什么样的，我相信你所看到的。

That would produce what I believe you are seeing.

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