Make custom theme use null background (Android lint suggestion)

Question

Im reading about the new Android Lint rules, and I find to prevent overdraw I should make my layouts with a background use a theme with null background, to prevent a background to be drawn if Im just gonna overwrite it. The problem is, how do I define a custom theme with null background?

Fail attempt 1 (doesn't compile):

<style name="NoTitleBarNoBackground" parent="@android:style/Theme.NoTitleBar">
        <item name="android:background">null</item>
</style>

Fail attempt 2 (warning persists):

<style name="NoTitleBarNoBackground" parent="@android:style/Theme.NoTitleBar">
        <item name="android:background">#00000000</item>
</style>

score 39 · Accepted Answer · answered Dec 19 '11 at 14:33

39

You can try this:

<style name="CustomTheme" parent="@android:style/Theme.Light.NoTitleBar">
        <item name="android:windowContentOverlay">@null</item>
        <item name="android:windowBackground">@null</item>
    </style>

Hope this helps!

answered Dec 19 '11 at 14:33

Dimitris Makris

5,183
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recent studies have shown that you are a gentleman and a scholar – pgsandstrom Dec 19 '11 at 14:37
Thanks for your answer. What is windowContentOverlay item for? – J.J. Kim Feb 19 '13 at 01:52
Just to answer J.J.Kim - Setting windowContentOverlay to @null would override the value from Theme.Default. Thus removing the shadow from under the status bar. – AndyW Jan 22 '15 at 19:31
1

This advice doesn't seem to hold anymore, in 2018. Don't understand why. – AutonomousApps Mar 29 '18 at 18:37

Make custom theme use null background (Android lint suggestion)

1 Answers1