Work on issue #17011123: Hit Back/Recents button when in Recents...

...without interacting with any of the Recents items should not
bring Home back to top

Add API demo for nav bar navigation.

Change-Id: I8b45f2bc0b554da19957ad723abe7cf4a14ee5a1

samples/ApiDemos/src/com/example/android/apis/ApiDemos.java

@@ -143,7 +143,8 @@ public class ApiDemos extends ListActivity {
     protected void onListItemClick(ListView l, View v, int position, long id) {
         Map<String, Object> map = (Map<String, Object>)l.getItemAtPosition(position);
 
-        Intent intent = (Intent) map.get("intent");
+        Intent intent = new Intent((Intent) map.get("intent"));
+        intent.addCategory(Intent.CATEGORY_SAMPLE_CODE);
         startActivity(intent);
     }
 }