layout : media_share_activity_layout : Remove style attribute for 'Continue' button
layout : media_share_activity_layout : For all Views, specify id attribute at beginning
MediaShareActivity: Move the code for the 'Continue' button's onClickListener to it's own method, and specify onClick method in layout file.
MediaShareActivity: Remove method setUpUserInterface and all references to it
MediaShareActivity.uploadMedia: Call finish method directly
MediaShareActivity.displayMediaList: Remove redundant checking of intent category - there is only one possible category right now - android.intent.action.SEND