Messaging: Further code improvements

* Remove redundant casts
* getParcelable(ArrayList|Exra) without class argument is deprecated
* ViewPager.setOnPageChangeListener -> addOnPageChangeListener
* RecyclerView.setOnScrollListener -> addOnScrollListener
* Remove unused initializations
* Remove unused code

Change-Id: I21beb6c90c675a4f2cfd7e3d5ebbd18b745f5911

src/com/android/messaging/util/EmailAddress.java

@@ -272,5 +272,5 @@ public final class EmailAddress {
     protected boolean valid = false;
     protected String user = null;
     protected String host = null;
-    protected boolean allowI18n = false;
+    protected boolean allowI18n;
 }