Why there is a white screen appears for 1sec when starting to run the apps in Android?

Question

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?

can you post the onCreate() of the activity that is launched when you start the app? — James McCracken, Sep 27 '12 at 03:05
Do you perform any tasks, like initializing something or downloading something at the first start? — Siddharth Lele, Sep 27 '12 at 03:31
yes, but I have set a progressdialog, but it still show the white screen for 1sec, then progressdialog — jjLin, Sep 27 '12 at 04:29

score 10 · Answer 1 · answered Jan 15 '14 at 08:23

The white/black screen is the window background image.

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.

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>

Programmatically you can achieve the same with

getWindow().setBackgroundDrawable(null);

at the top of activity onCreate().

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

score 4 · Answer 2 · answered Jun 27 '16 at 13:09

Settings. File>Settings>Build,Deployment>Instant Run Deselect all options shown there.

and add below line in your style.xml

    <item name="android:windowDisablePreview">true</item>
 <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
    <!-- Customize your theme here. -->
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
    <item name="android:windowFullscreen">true</item>
    <item name="android:windowDisablePreview">true</item>
</style>
apply changes in AndroidMainfest.xml
 <application
        android:theme="@style/AppTheme">

score 3 · Answer 3 · answered Sep 27 '12 at 04:51

3

After I change style.xml:

<resources>

    <style name="AppTheme" parent="android:Theme.Wallpaper" />

</resources>

it works!! Thanks all

answered Sep 27 '12 at 04:51

jjLin

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Answer is unclear since your question does not have a context of your discussion. – taxeeta Aug 09 '13 at 15:15

sharath yadhav · Answer 4 · 2014-09-10T06:34:48.830

1

Add the following in the manifest file of the corresponding activity

 android:launchMode="standard"

and remove android:label="@string/app_name" from the corresponding activity ,this actually helped me

edited Sep 10 '14 at 06:34

answered Sep 10 '14 at 06:25

sharath yadhav

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score 0 · Answer 5 · answered Sep 27 '12 at 03:10

0

In your manifest.xml file remove the line android:theme="@style/AppTheme" for your app. and check it again

answered Sep 27 '12 at 03:10

Ram kiran Pachigolla

20,897
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score 0 · Answer 6 · edited Jun 21 '14 at 18:06

0

Use this tag in your manifest:

android:theme="@android:style/Theme.NoTitleBar.Fullscreen"

edited Jun 21 '14 at 18:06

Praveen

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answered May 16 '14 at 05:02

JRE.exe

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score 0 · Answer 7 · answered Jun 12 '19 at 08:02

In Styles add the following things

    <item name="android:windowFullscreen">true</item>
    <item name="android:windowContentOverlay">@null</item>
    <item name="android:windowIsTranslucent">true</item>

Hope this will help you and its working for me

Why there is a white screen appears for 1sec when starting to run the apps in Android?

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