Play video in gallery

Signed-off-by: tobiasKaminsky <tobias@kaminsky.me>

app/src/main/java/com/owncloud/android/ui/preview/PreviewImagePagerAdapter.java

@@ -165,6 +165,8 @@ public class PreviewImagePagerAdapter extends FragmentStatePagerAdapter {
             } else {
                 if (file.isEncrypted()) {
                     fragment = FileDownloadFragment.newInstance(file, user, mObsoletePositions.contains(i));
+                } else if (PreviewMediaFragment.canBePreviewed(file)) {
+                    fragment = PreviewMediaFragment.newInstance(file, user, 0, false);
                 } else {
                     fragment = PreviewImageFragment.newInstance(file, mObsoletePositions.contains(i), true);
                 }