gistfile1.txt

    /**
     * Returns a list of packages that support Custom Tabs.
     */	
    public static ArrayList getCustomTabsPackages(Context context) {
        PackageManager pm = context.getPackageManager();
        // Get default VIEW intent handler.
        Intent activityIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.example.com"));

        // Get all apps that can handle VIEW intents.
        List resolvedActivityList = pm.queryIntentActivities(activityIntent, 0);
        ArrayList packagesSupportingCustomTabs = new ArrayList<>();
        for (ResolveInfo info : resolvedActivityList) {
            Intent serviceIntent = new Intent();
            serviceIntent.setAction(ACTION_CUSTOM_TABS_CONNECTION);
            serviceIntent.setPackage(info.activityInfo.packageName);
            // Check if this package also resolves the Custom Tabs service.
            if (pm.resolveService(serviceIntent, 0) != null) {
                packagesSupportingCustomTabs.add(info);
            }
        }
        return packagesSupportingCustomTabs;
    }