color, package and action bar configuration.

shared/src/main/java/org/chromium/customtabsclient/shared/CustomTabsHelper.java

Index: shared/src/main/java/org/chromium/customtabsclient/shared/CustomTabsHelper.java
diff --git a/shared/src/main/java/org/chromium/customtabsclient/shared/CustomTabsHelper.java b/shared/src/main/java/org/chromium/customtabsclient/shared/CustomTabsHelper.java
index 00af1e2189019aeabbcfcc4d498e22d09a2a073c..d5d70865f1ef98a88dcc3304ee61777eb4ed1e05 100644
--- a/shared/src/main/java/org/chromium/customtabsclient/shared/CustomTabsHelper.java
+++ b/shared/src/main/java/org/chromium/customtabsclient/shared/CustomTabsHelper.java
@@ -19,6 +19,7 @@ import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.pm.PackageManager;
 import android.content.pm.ResolveInfo;
+import android.graphics.Color;
 import android.net.Uri;
 import android.text.TextUtils;
 import android.util.Log;
@@ -60,9 +61,14 @@ public class CustomTabsHelper {
      * @param context {@link Context} to use for accessing {@link PackageManager}.
      * @return The package name recommended to use for connecting to custom tabs related components.
      */
-    public static String getPackageNameToUse(Context context) {
+    public static String getPackageNameToUse(Context context,
+                                             List<String> packagesSupportingCustomTabs) {
         if (sPackageNameToUse != null) return sPackageNameToUse;
 
+        if (packagesSupportingCustomTabs == null) {
+            packagesSupportingCustomTabs = getAllPackagesSupportingCustomTabs(context);
+        }
+
         PackageManager pm = context.getPackageManager();
         // Get default VIEW intent handler.
         Intent activityIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.example.com"));
@@ -72,18 +78,6 @@ public class CustomTabsHelper {
             defaultViewHandlerPackageName = defaultViewHandlerInfo.activityInfo.packageName;
         }
 
-        // Get all apps that can handle VIEW intents.
-        List<ResolveInfo> resolvedActivityList = pm.queryIntentActivities(activityIntent, 0);
-        List<String> packagesSupportingCustomTabs = new ArrayList<>();
-        for (ResolveInfo info : resolvedActivityList) {
-            Intent serviceIntent = new Intent();
-            serviceIntent.setAction(ACTION_CUSTOM_TABS_CONNECTION);
-            serviceIntent.setPackage(info.activityInfo.packageName);
-            if (pm.resolveService(serviceIntent, 0) != null) {
-                packagesSupportingCustomTabs.add(info.activityInfo.packageName);
-            }
-        }
-
         // Now packagesSupportingCustomTabs contains all apps that can handle both VIEW intents
         // and service calls.
         if (packagesSupportingCustomTabs.isEmpty()) {
@@ -107,6 +101,13 @@ public class CustomTabsHelper {
     }
 
     /**
+     * See getPackageNameToUse(Context, List<String).
+     */
+    public static String getPackageNameToUse(Context context) {
+        return getPackageNameToUse(context, null);
+    }
+
+    /**
      * Used to check whether there is a specialized handler for a given intent.
      * @param intent The intent to check with.
      * @return Whether there is a specialized handler for the given intent.
@@ -139,4 +140,65 @@ public class CustomTabsHelper {
     public static String[] getPackages() {
         return new String[]{"", STABLE_PACKAGE, BETA_PACKAGE, DEV_PACKAGE, LOCAL_PACKAGE};
     }
+
+    /**
+     * @return All possible colors.
+     */
+    public static String[] getColors() {

[Ian Wen, 2016/02/10 02:36:06]

This class is copied to many 3p apps, and thus it should be very generic and
only about custom tabs. Let's not put UI related code in this file. Move this
function to Advanced UI activity. Same for #181.

[BigBossZhiling, 2016/02/17 05:18:10]

Done.

+        ArrayList<String> fieldList = new ArrayList<String>();
+        String colorName;
+        for (int i = 0; i < Color.class.getFields().length; i ++) {
+            colorName = Color.class.getFields()[i].getName();
+            // Make only the first character capitalized.
+            fieldList.add(i, colorName.charAt(0) + colorName.substring(1).toLowerCase());
+        }
+        return fieldList.toArray(new String[fieldList.size()]);
+    }
+
+    /**
+     * Get all apps that support custom tabs.
+     * @param context
+     * @return
+     */
+    public static ArrayList<String> getAllPackagesSupportingCustomTabs(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<ResolveInfo> resolvedActivityList = pm.queryIntentActivities(activityIntent, 0);
+        ArrayList<String> packagesSupportingCustomTabs = new ArrayList<>();
+        for (ResolveInfo info : resolvedActivityList) {
+            Intent serviceIntent = new Intent();
+            serviceIntent.setAction(ACTION_CUSTOM_TABS_CONNECTION);
+            serviceIntent.setPackage(info.activityInfo.packageName);
+            if (pm.resolveService(serviceIntent, 0) != null) {
+                packagesSupportingCustomTabs.add(info.activityInfo.packageName);
+            }
+        }
+        return packagesSupportingCustomTabs;
+    }
+
+    public static int stringToColor(String color) {
+        try {
+            return (int) Color.class.getField(color.toUpperCase()).get(new Color());
+        } catch (Exception e) {
+            return 0; // Transparent.
+        }
+    }
+
+    public static String chromeStable() {

[Ian Wen, 2016/02/10 02:36:06]

Only make APIs if they are used immediately by our code, or they will be
stripped away by proguard anyway.

http://developer.android.com/tools/help/proguard.html

[BigBossZhiling, 2016/02/17 05:18:10]

Done.

+        return STABLE_PACKAGE;
+    }
+
+    public static String chromeBeta() {
+        return BETA_PACKAGE;
+    }
+
+    public static String chromeDev() {
+        return DEV_PACKAGE;
+    }
+
+    public static String chromeLocal() {
+        return LOCAL_PACKAGE;
+    }
 }