As we can have now any preview (if there is a preview generator), we also need a fallback for any mimetype

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

src/main/java/com/owncloud/android/ui/adapter/OCFileListAdapter.java

@@ -65,6 +65,7 @@ import com.owncloud.android.ui.TextDrawable;
 import com.owncloud.android.ui.activity.ComponentsGetter;
 import com.owncloud.android.ui.fragment.ExtendedListFragment;
 import com.owncloud.android.ui.interfaces.OCFileListFragmentInterface;
+import com.owncloud.android.utils.BitmapUtils;
 import com.owncloud.android.utils.DisplayUtils;
 import com.owncloud.android.utils.FileSortOrder;
 import com.owncloud.android.utils.FileStorageUtils;
@@ -487,11 +488,9 @@ public class OCFileListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHol
                                                                                    mAccount, asyncTasks);
 
                             if (thumbnail == null) {
-                                if (MimeTypeUtil.isVideo(file)) {
-                                    thumbnail = ThumbnailsCacheManager.mDefaultVideo;
-                                } else {
-                                    thumbnail = ThumbnailsCacheManager.mDefaultImg;
-                                }
+                                thumbnail = BitmapUtils.drawableToBitmap(
+                                    MimeTypeUtil.getFileTypeIcon(file.getMimeType(), file.getFileName(),
+                                                                 mAccount, mContext));
                             }
                             final ThumbnailsCacheManager.AsyncThumbnailDrawable asyncDrawable =
                                 new ThumbnailsCacheManager.AsyncThumbnailDrawable(mContext.getResources(),