Android Question Blank Activity when Loading

aaronk · Apr 13, 2018

Hi,

When my app loads (Main Activity) it shows a blank activity for approx. 0.5ms and then the layout loads.

My layout doesn't have much on it, other than a few EditText boxes and a few labels.

I have my manifest with the following:

B4X:

<uses-sdk android:minSdkVersion="16" android:targetSdkVersion="26"/>
<supports-screens android:largeScreens="true"
    android:normalScreens="true"
    android:smallScreens="true"
    android:anyDensity="true"/>)
SetApplicationAttribute(android:icon, "@drawable/icon")
SetApplicationAttribute(android:label, "$LABEL$")
SetApplicationAttribute(android:theme, "@android:style/Theme.Holo.Light.NoActionBar")

By adding that last line it made it hide the title bar (which is what I want).

in my Activity_Create sub (the first line in that sub) I have:

B4X:

Activity.Color = Colors.RGB(0,85,167)

Which should set the activity back colour to a blue colour.

However, when my app loads it shows a light grey background and not a blue background while the app loads the layout.

Is there something I have done wrong ?

DonManfred · Apr 13, 2018

What are you doind else in your activity_create which may causes the 0,5 sec delay?

Peter Simpson · Apr 13, 2018

Try the following manifest code, it might help you out, change #435054 to suit.

B4X:

SetApplicationAttribute(android:theme, "@style/LightTheme")
    CreateResource(values, theme.xml,
        <resources>
            <color name="clr">#435054</color>
            <style name="LightTheme" parent="@android:style/Theme.Material.Light">
            <item name="android:windowBackground">@color/clr
            </item></style>
        </resources>
)

Enjoy...

aaronk · Apr 13, 2018

DonManfred said:
What are you doind else in your activity_create which may causes the 0,5 sec delay?

Just the one layout. I am loading the layout into a Side menu (using ClsSlidingSidebar).

Peter Simpson said:
does the following code help at all, I think that it might help you.

I just tried that, but it shows the background to be a dark grey and the title bar is now showing.

Once the app has been open, and I press the home button and then open the app again, it shows the app fine. I guess it's because the app has loaded the layout already.

I might just leave it as it is.. I guess it's not a major thing but would of been good to solve.

Peter Simpson · Apr 13, 2018

aaronk said:
I just tried that, but it shows the background to be a dark grey and the title bar is now showing

I had the same problem with the background loading white instead of grey in my case, the code I posted fixed the background color issue for me, the quick white background flash was seriously annoying me. Try playing about with it until it works perfect for you...

aaronk · Apr 14, 2018

Peter Simpson said:
Try playing about with it until it works perfect for you

Just tried again by changing that colour value and it looks good now

B4X:

SetApplicationAttribute(android:theme, "@style/LightTheme")
    CreateResource(values, theme.xml,
        <resources>
            <color name="clr">#0055A7</color>
            <style name="LightTheme" parent="@android:style/Theme.Holo.Light.NoActionBar">
            <item name="android:windowBackground">@color/clr
            </item></style>
        </resources>
)

I wonder if there was a way in displaying a small image as well in the centre of the screen while it loads the layout?

I know I could load a layout with a image, but is there a way in doing that from the manifest so I don't have to wait for the layout to load? I guess I am going to have the same result as it needs time to load the image.

Peter Simpson · Apr 14, 2018

Oops, I forgot that you wanted .NoActionBar in the theme @aaronk, I would have put that in for you if I would have remembered. Anyway I'm pleased that you got it working.

Erel · Apr 15, 2018

aaronk said:
SetApplicationAttribute(android:theme, "@android:style/Theme.Holo.Light.NoActionBar")

This is a mistake. Forcing all Android 5+ devices to use the holo theme will make your app look old for no good reason.

See this: https://www.b4x.com/android/forum/threads/theme-colors.87716/#content

Android Question Blank Activity when Loading

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