android - Dividers didn't display in RecyclerView after addItemDecoration() called -


a recyclerview nested in cardview. tried call additemdecoration() add dividers recycylerview，but didn't work.

<android.support.v7.widget.cardview xmlns:card_view="http://schemas.android.com/apk/res-auto"     android:layout_width="match_parent"     android:layout_height="wrap_content"     card_view:cardbackgroundcolor="@color/white_color"     android:layout_marginleft="10dp"     android:layout_marginright="10dp"     card_view:cardelevation="3dp">      <android.support.v4.widget.swiperefreshlayout         android:id="@+id/swipe_saleproduct_list"         android:layout_width="match_parent"         android:layout_height="match_parent">          <android.support.v7.widget.recyclerview             android:id="@+id/recycler_saleproduct_list"             android:layout_width="match_parent"             android:layout_height="match_parent"             android:layout_centerhorizontal="true"             android:layout_centervertical="true"             android:visibility="visible" />      </android.support.v4.widget.swiperefreshlayout> </android.support.v7.widget.cardview>

the java code:

    mswipe = (swiperefreshlayout)view.findviewbyid(r.id.swipe_saleproduct_list);     mrecyclerview= (recyclerview) view.findviewbyid(r.id.recycler_saleproduct_list);     mrecyclerview.setlayoutmanager(new linearlayoutmanager(uiutils.getcontext()));     mrecyclerview.additemdecoration(new divideritemdecoration(uiutils.getcontext(), divideritemdecoration.vertical_list));     saleproductlistadapter saleproductlistadapter = new saleproductlistadapter(uiutils.getcontext(), mrecyclerview, list, mswipe);     mrecyclerview.setadapter(saleproductlistadapter);

this below example, take @ it:

public class divideritemdecoration extends recyclerview.itemdecoration {       private static final int[] attrs = new int[]{             android.r.attr.listdivider     };      public static final int horizontal_list = linearlayoutmanager.horizontal;      public static final int vertical_list = linearlayoutmanager.vertical;      private drawable mdivider;      private int morientation;      public divideritemdecoration(context context, int orientation) {         final typedarray = context.obtainstyledattributes(attrs);         mdivider = a.getdrawable(0);         a.recycle();         setorientation(orientation);     }      public void setorientation(int orientation) {         if (orientation != horizontal_list && orientation != vertical_list) {             throw new illegalargumentexception("invalid orientation");         }         morientation = orientation;     }      @override     public void ondraw(canvas c, recyclerview parent) {         if (morientation == vertical_list) {             drawvertical(c, parent);         } else {             drawhorizontal(c, parent);         }     }      public void drawvertical(canvas c, recyclerview parent) {         final int left = parent.getpaddingleft();         final int right = parent.getwidth() - parent.getpaddingright();          final int childcount = parent.getchildcount();         (int = 0; < childcount; i++) {             final view child = parent.getchildat(i);             final recyclerview.layoutparams params = (recyclerview.layoutparams) child                     .getlayoutparams();             final int top = child.getbottom() + params.bottommargin;             final int bottom = top + mdivider.getintrinsicheight();             mdivider.setbounds(left, top, right, bottom);             mdivider.draw(c);         }     }      public void drawhorizontal(canvas c, recyclerview parent) {         final int top = parent.getpaddingtop();         final int bottom = parent.getheight() - parent.getpaddingbottom();          final int childcount = parent.getchildcount();         (int = 0; < childcount; i++) {             final view child = parent.getchildat(i);             final recyclerview.layoutparams params = (recyclerview.layoutparams) child                     .getlayoutparams();             final int left = child.getright() + params.rightmargin;             final int right = left + mdivider.getintrinsicheight();             mdivider.setbounds(left, top, right, bottom);             mdivider.draw(c);         }     }      @override     public void getitemoffsets(rect outrect, int itemposition, recyclerview parent) {         if (morientation == vertical_list) {             outrect.set(0, 0, 0, mdivider.getintrinsicheight());         } else {             outrect.set(0, 0, mdivider.getintrinsicwidth(), 0);         }     } }

and here fragment, works well, divider clear , thin:

public static class recyclerviewfragment extends fragment {     @override     public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {         view root = inflater.inflate(r.layout.fragment_recyclerview, container, false);          recyclerview recyclerview = (recyclerview) root.findviewbyid(r.id.recycler_view);         recyclerview.sethasfixedsize(true);         recyclerview.setitemanimator(new defaultitemanimator());         recyclerview.setlayoutmanager(new linearlayoutmanager(getactivity()));         recyclerview.additemdecoration(new divideritemdecoration(getactivity(), divideritemdecoration.vertical_list));          recyclerviewadapter adapter = new recyclerviewadapter(getactivity(), getresources()             .getstringarray(r.array.countries));         recyclerview.setadapter(adapter);          return root;     } }

i hope inspired.


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