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/ImageUtils.java

@@ -107,7 +107,6 @@ public class ImageUtils {
                 if (oomCount <= MAX_OOM_COUNT) {
                     Factory.get().reclaimMemory();
                 } else {
-                    done = true;
                     LogUtil.w(TAG, "Failed to convert bitmap to bytes. Out of Memory.");
                 }
                 throw e;