Android - Prevent white screen at startup

Question

As we all know, many Android apps display a white screen very briefly before their first Activity comes into focus. This problem is observed in the following cases:

• Android apps that extend the global Application class and perform major initializations therein. The Application object is always created before the first Activity (a fact that can be observed in the debugger), so this makes sense. This is the cause of the delay in my case.

• Android apps that display the default preview window before the splash screen.

Setting android:windowDisablePreview = "true" obviously does not work here. Nor can I set the parent theme of the splash screen to Theme.Holo.NoActionBar as described here, because [unfortunately] my splash screen makes use of an ActionBar.

Meanwhile, apps that do not extend the Application class do not show the white screen at startup.

The thing is, ideally the initializations performed in the Application object need to occur before the first Activity is shown. So my question is, how can I perform these initializations on app startup without using an Application object? Possibly using a Thread or Service, I suppose?

This is an interesting problem to think about. I can't bypass it the usual way (by setting the NoActionBar theme), as tragically my Splash screen actually has an ActionBar due to some unrelated reasons.

Note:

I have already referred to the following questions:

• How To fix white screen on app Start up?

• Android splash screen is white in the beginning?

• White screen before splashscreen

• White background when Android app start up

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

References:

• Patterns – Launch screens.

• Branded launch screen: the new splash for Android.

• Splash Screens the Right Way.

Answer 1

Just write the item in values/styles.xml:

<item name="android:windowBackground">@android:color/black</item>

For example, in the AppTheme:

<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
    <item name="windowNoTitle">true</item>
    <item name="windowActionBar">false</item>
    <item name="android:windowFullscreen">true</item>
    <item name="android:windowContentOverlay">@null</item>

    <item name="android:windowBackground">@android:color/black</item>

    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
</style>

Answer 2

Style :- 
<style name="SplashViewTheme" parent="Theme.AppCompat.NoActionBar">
    <item name="android:windowBackground">@drawable/splash</item>
    <item name="windowActionBar">false</item>
    <item name="windowNoTitle">true</item>
</style>

In Manifest :- 
<activity android:name=".SplashActivity"
        android:theme="@style/SplashViewTheme">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>