how to completely get rid of an activity's GUI (avoid a black screen)

最新推荐文章于 2025-04-27 09:38:08 发布

FrancisLeeTang

最新推荐文章于 2025-04-27 09:38:08 发布

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分类专栏： Android 文章标签： returning networking service android action

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本文探讨如何创建一个无GUI的应用程序，并在启动时不显示黑屏。通过在应用的manifest文件中使用android:theme=@android:style/Theme.NoDisplay属性，可以避免应用启动时出现短暂的黑屏现象。此外，文章还建议在完成所有工作前调用finish()方法，以确保应用在后台继续运行。

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http://stackoverflow.com/questions/4551868/how-to-completely-get-rid-of-an-activitys-gui-avoid-a-black-screen

Question:

I'm trying to write a very simple app that will do just one very simple non-GUI action, then display a short message (using toast, on top of what was already on the screen, e.g. home screen), and finish. That's all.

This almost works, but i'm still getting a brief black screen after the app starts, then back to home screen and things work as i intend after that. I thought that not using setContentView on my activity (thus depriving it of a View) would be enough to avoid the black screen, but it still pops up.Please notice that (as suggested in a related question), a service is not the answer to my problem. I just want a GUI-less (except for one toast) app that runs and ends right away.Thanks :)

Answer:

In in your manifest use android:theme="@android:style/Theme.NoDisplay".

Note this assumes you will call finish() before returning from onResume(). If you are going to do more work after that (for example if you will be doing any networking or other such thing that can't be done quickly synchronously), you will probably want to start a service to take care of the work to tell the platform your process should continue running after the activity finishes.