开始在Android中运行应用程序时，为什么会出现白屏1秒钟? [英] Why there is a white screen appears for 1sec when starting to run the apps in Android?

问题描述

当我单击应用程序图标并开始运行应用程序时，它将显示白屏1秒钟.
我不知道为什么.
有什么主意可以清除这个白屏并直接进入我的活动吗?

When I click the app icons and start to run the apps, it will appear a white screen for 1 sec.
I don't know why.
Is there any idea to clear this white screen and directly go to my activity?

推荐答案

黑色屏幕是窗口背景图片.

The white/black screen is the window background image.

例如，当显示您的onCreate()运行，并且布局正在膨胀.可能需要一些时间，尤其是在需要读取，解码和缩放很多位图的情况下.

The window background is shown while e.g. your onCreate() runs and your layouts are being inflated. It can take some time especially if there's a lot of bitmaps that need to be read, decoded and scaled.

更改主题是可行的，因为某些主题具有非默认的窗口背景.例如， Theme.Wallpaper具有透明的背景.那里也有其他定义.本质上您想要的是:

Changing the theme works because some themes have a non-default window background. For example, Theme.Wallpaper has a transparent background. There are other definitions there, too. Essentially what you want is:

<style name="YourTheme">
  <item name="android:windowBackground">@null</item>
</style>

通过编程，您可以通过以下方式实现相同的目标

Programmatically you can achieve the same with

getWindow().setBackgroundDrawable(null);

位于活动onCreate()的顶部.

(老问题，但又被另一个答案撞了，没有一个好的答案.)

(Old question but got bumped up by another answer and there wasn't a good answer.)

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