Use data binding for proper formatting of one date field.

Test: build and run the app
Change-Id: Ie1cd7cc47de0f330152ee144e6bcdba3f33cb8b6
diff --git a/samples-flatfoot/GithubBrowser/app/src/main/java/com/android/sample/githubbrowser/Utils.java b/samples-flatfoot/GithubBrowser/app/src/main/java/com/android/sample/githubbrowser/Utils.java
index 254a9e7..ce3ea2f 100644
--- a/samples-flatfoot/GithubBrowser/app/src/main/java/com/android/sample/githubbrowser/Utils.java
+++ b/samples-flatfoot/GithubBrowser/app/src/main/java/com/android/sample/githubbrowser/Utils.java
@@ -36,6 +36,9 @@
  * Helper methods.
  */
 public class Utils {
+    private static SimpleDateFormat sJsonDateParser = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss",
+            Locale.ENGLISH);
+
     private Utils() {
         // This is here to prevent object initialization
     }
@@ -57,12 +60,9 @@
         if (TextUtils.isEmpty(jsonDate)) {
             return;
         }
-        final SimpleDateFormat responseDateParser = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss",
-                Locale.ENGLISH);
         try {
-            textView.setText(
-                    SimpleDateFormat.getDateInstance(SimpleDateFormat.SHORT).format(
-                            responseDateParser.parse(jsonDate)));
+            textView.setText(SimpleDateFormat.getDateInstance(SimpleDateFormat.SHORT).format(
+                    sJsonDateParser.parse(jsonDate)));
         } catch (ParseException pe) {
             // WTF
         }
@@ -74,9 +74,11 @@
     @BindingAdapter({"stringRes", "jsonDate"})
     public static void formatDateWithString(TextView textView, @StringRes int stringRes,
             String jsonDate) {
+        if (TextUtils.isEmpty(jsonDate)) {
+            return;
+        }
         try {
-            Date date = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss",
-                    Locale.ENGLISH).parse(jsonDate);
+            Date date = sJsonDateParser.parse(jsonDate);
             String formattedDate = SimpleDateFormat.getDateInstance(
                     SimpleDateFormat.SHORT).format(date);
             textView.setText(textView.getResources().getString(stringRes,
diff --git a/samples-flatfoot/GithubBrowser/app/src/main/res/layout/fragment_repo_list.xml b/samples-flatfoot/GithubBrowser/app/src/main/res/layout/fragment_repo_list.xml
index 8e4df45..a4083c7 100644
--- a/samples-flatfoot/GithubBrowser/app/src/main/res/layout/fragment_repo_list.xml
+++ b/samples-flatfoot/GithubBrowser/app/src/main/res/layout/fragment_repo_list.xml
@@ -6,5 +6,5 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:background="@color/background"
-    tools:context="com.android.sample.githubbrowser.MainActivityFragment"
+    tools:context="com.android.sample.githubbrowser.RepositoryListFragment"
     tools:showIn="@layout/activity_main"/>
diff --git a/samples-flatfoot/GithubBrowser/app/src/main/res/layout/fragment_user_details.xml b/samples-flatfoot/GithubBrowser/app/src/main/res/layout/fragment_user_details.xml
index aea0080..e06dd5c 100644
--- a/samples-flatfoot/GithubBrowser/app/src/main/res/layout/fragment_user_details.xml
+++ b/samples-flatfoot/GithubBrowser/app/src/main/res/layout/fragment_user_details.xml
@@ -7,10 +7,11 @@
         <import type="java.lang.Integer"/>
         <import type="android.text.TextUtils"/>
         <import type="android.view.View"/>
+        <import type="com.android.sample.githubbrowser.R"/>
         <import type="com.android.sample.githubbrowser.Utils"/>
         <variable name="userPartial" type="com.android.sample.githubbrowser.ContributorData"/>
         <variable name="user" type="com.android.sample.githubbrowser.PersonData"/>
-        <variable name="fragment" type="android.support.v4.app.Fragment"/>
+        <variable name="fragment" type="com.android.support.lifecycle.LifecycleFragment"/>
     </data>
 
     <LinearLayout
@@ -74,7 +75,8 @@
                 android:textColor="#444"
                 android:textSize="14sp"
                 android:visibility="@{((user == null) || TextUtils.isEmpty(user.created_at)) ? View.INVISIBLE : View.VISIBLE}"
-                app:jsonDate="@{user.created_at}"/>
+                app:jsonDate="@{user.created_at}"
+                app:stringRes="@{R.string.joined}"/>
 
         </RelativeLayout>