Add "Add Account" to prefs headers

Borrowed + icon from authentication widget

b/16298155

Change-Id: I36d0eb2c7b9e98442d72481254d9a4da2ae3c999

res/layout-w600dp/authentication_view.xml

@@ -31,7 +31,7 @@
             android:layout_weight="1"
             android:padding="16dip"
             android:drawablePadding="16dip"
-            android:drawableStart="@drawable/ic_setup_add_authentication"
+            android:drawableStart="@drawable/ic_settings_add"
             android:textAppearance="?android:attr/textAppearanceSmall"
             android:textColor="?android:attr/textColorPrimary"/>
     </LinearLayout>

res/layout/authentication_view.xml

@@ -42,7 +42,7 @@
             android:padding="16dip"
             android:drawablePadding="16dip"
             style="@style/account_setup_label_text"
-            android:drawableStart="@drawable/ic_setup_add_authentication"
+            android:drawableStart="@drawable/ic_settings_add"
             android:textAppearance="?android:attr/textAppearanceSmall"
             android:textColor="?android:attr/textColorPrimary"/>
     </LinearLayout>

res/xml/email_extra_preference_headers.xml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) 2014 Google Inc.
+     Licensed to The Android Open Source Project.
+
+     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,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<preference-headers xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <header android:id="@+id/add_account_header"
+            android:title="@string/add_account"
+            android:icon="@drawable/ic_settings_add" />
+
+</preference-headers>

res/xml/preference_headers.xml

@@ -17,7 +17,6 @@
 -->
 
 <preference-headers xmlns:android="http://schemas.android.com/apk/res/android">
-    xmlns:android="http://schemas.android.com/apk/res/android">
 
     <header android:fragment="com.android.email.activity.setup.GeneralPreferences"
             android:title="@string/general_preferences_title" />

src/com/android/email/activity/setup/EmailPreferenceActivity.java

@@ -220,7 +220,10 @@ public class EmailPreferenceActivity extends MailPreferenceActivity {
     @Override
     public void onBuildExtraHeaders(List<Header> target) {
         super.onBuildExtraHeaders(target);
-        // finally, if debug header is enabled, show it
+
+        loadHeadersFromResource(R.xml.email_extra_preference_headers, target);
+
+        // if debug header is enabled, show it
         if (DEBUG_MENU_ALLOWED) {
             if (mShowDebugMenu) {
                 // setup lightweight header for debugging
@@ -252,6 +255,10 @@ public class EmailPreferenceActivity extends MailPreferenceActivity {
         } else {
             mNumGeneralHeaderClicked = 0;
         }
+        if (header.id == R.id.add_account_header) {
+            onAddNewAccount();
+            return;
+        }
 
         // Process header click normally
         super.onHeaderClick(header, position);