-    private void updateCurrentDownloadFragment(boolean transferring) {
-        FileFragment fragment = mPreviewImagePagerAdapter.getFragmentAt(mViewPager.getCurrentItem());
-        if (fragment instanceof FileDownloadFragment) {
-            ((FileDownloadFragment) fragment).updateView(transferring); 
-            //mViewPager.invalidate();
-        }
-    }
-    
-