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/receiver/SendStatusReceiver.java

@@ -82,7 +82,7 @@ public class SendStatusReceiver extends BroadcastReceiver {
                 LogUtil.e(LogUtil.BUGLE_TAG, "SendStatusReceiver: empty report message");
                 return;
             }
-            int status = Sms.STATUS_COMPLETE;
+            int status;
             try {
                 final String format = intent.getStringExtra("format");
                 status = smsMessage.getStatus();