fix bug

app/src/main/java/com/github/tvbox/osc/ui/adapter/SeriesAdapter.java

@@ -1,6 +1,8 @@
 package com.github.tvbox.osc.ui.adapter;
 
+import android.app.Activity;
 import android.graphics.Color;
+import android.view.View;
 import android.widget.TextView;
 
 import com.chad.library.adapter.base.BaseQuickAdapter;
@@ -37,13 +39,13 @@ public class SeriesAdapter extends BaseQuickAdapter<VodInfo.VodSeries, BaseViewH
             helper.itemView.setNextFocusUpId(R.id.mGridViewFlag);
         }
 
+        View mSeriesGroupTv = ((Activity) helper.itemView.getContext()).findViewById(R.id.mSeriesGroupTv);
+        if (getData().size()>1 && mSeriesGroupTv != null && mSeriesGroupTv.getVisibility() == View.VISIBLE) {
             int spanCount = mGridLayoutManager.getSpanCount();
             int position = helper.getLayoutPosition();
-
             if (position < spanCount) {
                 helper.itemView.setNextFocusUpId(R.id.mSeriesSortTv);
             }
-
             int totalCount = getData().size();
             int remainder = totalCount % spanCount;
             int lastRowStart = remainder == 0 ? totalCount - spanCount : totalCount - remainder;
@@ -53,3 +55,4 @@ public class SeriesAdapter extends BaseQuickAdapter<VodInfo.VodSeries, BaseViewH
             }
         }
     }
+}