I noticed since the previous versions that a whitebar or something white like that shows on the startup of an app when splashscreens start to disappear and statusbar also disappears. It seems like when the status bar was gone, the whole window or blackscreen adjusts into moving upwards. That causes a white blank bar below the screen for a second.From the devices I tested, the white bar didn't show in Samsung Galaxy Grand Quattro(Jellybean) but showed in Samsung E7(Kitkat) and Samsung J7(Lollipop). My game has a 1280x720 pixel resolution.
I used Construct 2 for my game and exported to android crosswalk. Many of us C2 users experience this, I hope this get fixed soon.
Please add these lines in the intel.additions.cofig.xml file which is located under your project.
<preference name="FadeSplashScreen" value="false"/>
This might solve the problem and make sure you are building for Android crosswalk instead of Android.