color, package and action bar configuration.

demos/src/main/java/org/chromium/customtabsdemos/CustomTabActivityHelper.java

 // Copyright 2015 Google Inc. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 34 matching lines @@
      *
      * @param activity The host activity.
      * @param customTabsIntent a CustomTabsIntent to be used if Custom Tabs is available.
      * @param uri the Uri to be opened.
      * @param fallback a CustomTabFallback to be used if Custom Tabs is not available.
      */
     public static void openCustomTab(Activity activity,
                                      CustomTabsIntent customTabsIntent,
                                      Uri uri,
                                      CustomTabFallback fallback) {
-        String packageName = CustomTabsHelper.getPackageNameToUse(activity);
+        openCustomTab(activity, customTabsIntent, uri, fallback, null);
+    }
 
-        //If we cant find a package name, it means theres no browser that supports
-        //Chrome Custom Tabs installed. So, we fallback to the webview
+    public static void openCustomTab(Activity activity,
+                                     CustomTabsIntent customTabsIntent,

[Ian Wen, 2016/03/16 01:35:30]

Public methods should have javadocs

[BigBossZhiling, 2016/03/18 00:59:07]

Done.

+                                     Uri uri,
+                                     CustomTabFallback fallback,
+                                     String packageName) {
         if (packageName == null) {
-            if (fallback != null) {
-                fallback.openUri(activity, uri);
+            packageName = CustomTabsHelper.getPackageNameToUse(activity);
+            //If we cant find a package name, it means theres no browser that supports
+            //Chrome Custom Tabs installed. So, we fallback to the webview
+            if (packageName == null) {
+                if (fallback != null) {
+                    fallback.openUri(activity, uri);
+                }
             }
         } else {
             customTabsIntent.intent.setPackage(packageName);
             customTabsIntent.launchUrl(activity, uri);
         }
     }
 
     /**
      * Unbinds the Activity from the Custom Tabs Service.
      * @param activity the activity that is connected to the service.
@@ skipping 91 matching lines @@
     public interface CustomTabFallback {
         /**
          *
          * @param activity The Activity that wants to open the Uri.
          * @param uri The uri to be opened by the fallback.
          */
         void openUri(Activity activity, Uri uri);
     }
 
 }