Ui elements of Webviews have white backgrounds instead of transparent. (Clone)

[johndoe235]

Cloned from AzureAD/microsoft-authentication-library-for-android#2381 Putting it here as well because it's directly linked to the common module

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Description of the bug:

1. Open a website with MSAL webview.
2. Observe native webview elements
3. See that they have white background instead of transparent one( copy, paste, zoom buttons)

Video of issue

webview_broken_theme.mov

Cause:

This is caused by refactoring of the DualScreenActivity in 7.0.0.
Specifically you programatically set a theme that is broken by design making it almost impossible to fix on the user side.

 protected int getThemeResId() {
        return R.style.DualScreenActivityTheme;
    }

 <style name="DualScreenActivityTheme" parent="Theme.AppCompat.Light">
        <item name="android:background">@color/com_microsoft_identity_common_white</item>
    </style>

This background color is used by the webview making it draw it's elements with a white background instead of a

Correct steps for fixing.

-android:background needs to be transparent
-Try to abstain from programatically setting themes. If you want to use a theme put it in the manifest so that a user can easily override it.