Android/app/src/main/java/com/moiseum/wolnelektury/view/search/components/EmptySupportRecyclerView.java

   1 package com.moiseum.wolnelektury.view.search.components;
   2
   3 import android.content.Context;
   4 import android.support.v7.widget.RecyclerView;
   5 import android.util.AttributeSet;
   6 import android.view.View;
   7
   8 /**
   9  * Created by piotrostrowski on 17.07.2017.
  10  */
  11
  12 public class EmptySupportRecyclerView extends RecyclerView {
  13         private View emptyView;
  14
  15         private AdapterDataObserver emptyObserver = new AdapterDataObserver() {
  16
  17
  18                 @Override
  19                 public void onChanged() {
  20                         RecyclerView.Adapter<?> adapter = getAdapter();
  21                         if (adapter != null && emptyView != null) {
  22                                 if (adapter.getItemCount() == 0) {
  23                                         emptyView.setVisibility(View.VISIBLE);
  24                                         EmptySupportRecyclerView.this.setVisibility(View.GONE);
  25                                 } else {
  26                                         emptyView.setVisibility(View.GONE);
  27                                         EmptySupportRecyclerView.this.setVisibility(View.VISIBLE);
  28                                 }
  29                         }
  30
  31                 }
  32         };
  33
  34         public EmptySupportRecyclerView(Context context) {
  35                 super(context);
  36         }
  37
  38         public EmptySupportRecyclerView(Context context, AttributeSet attrs) {
  39                 super(context, attrs);
  40         }
  41
  42         public EmptySupportRecyclerView(Context context, AttributeSet attrs, int defStyle) {
  43                 super(context, attrs, defStyle);
  44         }
  45
  46         @Override
  47         public void setAdapter(Adapter adapter) {
  48                 super.setAdapter(adapter);
  49
  50                 if (adapter != null) {
  51                         adapter.registerAdapterDataObserver(emptyObserver);
  52                 }
  53
  54                 emptyObserver.onChanged();
  55         }
  56
  57         public void setEmptyView(View emptyView) {
  58                 this.emptyView = emptyView;
  59         }
  60 }