[WifiSettings] Refactor Wi-Fi required info

Instead of using an invisible TextView in the layout itself, make the
required info a list header. This paves way for using the Setup
Wizard library by including all the required contents in the ListView
itself.

The required info is not shown since Lollipop, but can be tested with
    adb shell am start -a "com.android.net.wifi.SETUP_WIFI_NETWORK" \
            --es theme material_light \
            --ez useImmersiveMode true \
            --ez wifi_show_wifi_required_info true

Bug: 19698532
Change-Id: I5a7da726b2f49af7dd755b41c73e1a1b4349699c

res/layout-land/setup_preference.xml

@@ -37,15 +37,6 @@
 
     </FrameLayout>
 
-    <TextView
-        android:id="@+id/wifi_required_info"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_marginBottom="6dp"
-        android:textAppearance="?android:attr/textAppearanceMedium"
-        android:text="@string/wifi_required_info_text"
-        android:visibility="gone" />
-
     <ListView
         android:id="@android:id/list"
         android:layout_width="match_parent"

res/layout-sw600dp-land/setup_preference.xml

@@ -53,15 +53,6 @@
                 android:elevation="@dimen/setup_wizard_card_elevation"
                 android:orientation="vertical">
 
-                <TextView
-                    android:id="@+id/wifi_required_info"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginBottom="6dp"
-                    android:text="@string/wifi_required_info_text"
-                    android:textAppearance="?android:attr/textAppearanceMedium"
-                    android:visibility="gone" />
-
                 <ListView
                     android:id="@android:id/list"
                     android:layout_width="match_parent"

res/layout-sw600dp/setup_preference.xml

@@ -51,15 +51,6 @@
                 android:elevation="@dimen/setup_wizard_card_elevation"
                 android:orientation="vertical">
 
-                <TextView
-                    android:id="@+id/wifi_required_info"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginBottom="6dp"
-                    android:text="@string/wifi_required_info_text"
-                    android:textAppearance="?android:attr/textAppearanceMedium"
-                    android:visibility="gone" />
-
                 <ListView
                     android:id="@android:id/list"
                     android:layout_width="match_parent"

res/layout/setup_preference.xml

@@ -22,15 +22,6 @@
     android:layout_height="match_parent"
     android:orientation="vertical">
 
-    <TextView
-        android:id="@+id/wifi_required_info"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_marginBottom="6dip"
-        android:textAppearance="?android:attr/textAppearanceMedium"
-        android:text="@string/wifi_required_info_text"
-        android:visibility="gone" />
-
     <com.android.settings.widget.StickyHeaderListView
         android:id="@android:id/list"
         android:layout_width="match_parent"

res/layout/setup_wifi_required_info.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) 2015 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.
+-->
+
+<TextView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/wifi_required_info"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:paddingTop="@dimen/setup_wizard_margin_top"
+    android:paddingBottom="6dip"
+    android:paddingStart="@dimen/setup_wizard_margin_sides"
+    android:paddingEnd="@dimen/setup_wizard_margin_sides"
+    android:text="@string/wifi_required_info_text"
+    android:textAppearance="@style/TextAppearance.SetupWizardDescription" />

src/com/android/settings/wifi/WifiSettingsForSetupWizard.java

@@ -73,7 +73,9 @@ public class WifiSettingsForSetupWizard extends WifiSettings {
 
         final Intent intent = getActivity().getIntent();
         if (intent.getBooleanExtra(EXTRA_SHOW_WIFI_REQUIRED_INFO, false)) {
-            view.findViewById(R.id.wifi_required_info).setVisibility(View.VISIBLE);
+            final View requiredInfo =
+                    inflater.inflate(R.layout.setup_wifi_required_info, list, false);
+            list.addHeaderView(requiredInfo, null, false);
         }
 
         return view;