Changing Status Bar colour when launching a TWA

LauncherActivity.java

// Copy LauncherActivity from the support library repo
// (https://github.com/GoogleChrome/custom-tabs-client/blob/master/customtabs/src/android/support/customtabs/trusted/LauncherActivity.java#L153-L155)
// and replace the getCustomTabsIntent method, as below:
    protected CustomTabsIntent getCustomTabsIntent(CustomTabsSession session) {
        return new CustomTabsIntent.Builder(session)
          .setToolbarColor(Color.parseColor("#000000"))
          .build();
    }

You could override the getLaunchingUrl to return Uri.parse("https://www.example.com/");

Do you mind posting the question on StackOverflow? (https://stackoverflow.com/questions/tagged/trusted-web-activity/). It will make easer for other developers with the same issue to find the answer (and other people can help with the answer too).