title: how to stop the items duplication in recyclerView android
body: <p>Actually my problem is when I click the item it go to a DetailsFragment. But when I return back to my ItemListFragment the items number is increased and duplication is occurred. Please help me to recover from it.. Thanks in advance....</p>
  
  <h1>ItemListFragment</h1>
  
  <pre><code>public class ItemsListFragment extends Fragment {
      public static final String SINGLE_ITEMS = "single_items";
      String[] mNames;
      String[] mPrices;
      int[] mImages;
      Context mContext;
      ArrayList&lt;Data&gt; mArrayList = new ArrayList&lt;Data&gt;();
  
  
      @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container,
                               Bundle savedInstanceState) {
  
          View view = inflater.inflate(R.layout.fragment_items_list, container, false);
          RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.items_list_recycler);
  
          String allFields = getArguments().getString(CategoryFragment.ALL_FIELD);
  
          assert allFields != null;
          switch (allFields) {
              case "women_clothing":
                  mNames = getResources().getStringArray(R.array.women_clothing_names);
                  mPrices = getResources().getStringArray(R.array.women_clothing_prices);
                  mImages = DataValues.women_clothing_images;
  
                  break;
              case "women_shoes":
                  mNames = getResources().getStringArray(R.array.women_shoes_names);
                  mPrices = getResources().getStringArray(R.array.women_shoes_prices);
                  mImages = DataValues.women_shoes_images;
  
                  break;
              case "women_bags":
                  mNames = getResources().getStringArray(R.array.women_bags_names);
                  mPrices = getResources().getStringArray(R.array.women_bags_prices);
                  mImages = DataValues.women_bags_images;
  
                  break;
              case "women_watches":
                  mNames = getResources().getStringArray(R.array.women_watches_names);
                  mPrices = getResources().getStringArray(R.array.women_watches_prices);
                  mImages = DataValues.women_watches_images;
  
                  break;
              case "women_sunglasses":
                  mNames = getResources().getStringArray(R.array.women_sunglasses_names);
                  mPrices = getResources().getStringArray(R.array.women_sunglasses_prices);
                  mImages = DataValues.women_sunglasses_images;
  
                  break;
              case "women_accessories":
                  mNames = getResources().getStringArray(R.array.women_accessories_names);
                  mPrices = getResources().getStringArray(R.array.women_accessories_prices);
                  mImages = DataValues.women_accessories_images;
  
                  break;
          }
  
          int i = 0;
          for (String name : mNames) {
              Data data = new Data(name, mPrices[i], mImages[i]);
              mArrayList.add(data);
              i++;
          }
  
          ItemListGridAdapter adapter = new ItemListGridAdapter(getActivity(), mArrayList, allFields);
          recyclerView.setAdapter(adapter);
  
          RecyclerView.LayoutManager manager = new GridLayoutManager(getActivity(), 2);
          recyclerView.setLayoutManager(manager);
          recyclerView.setHasFixedSize(true);
  
  
          return view;
      }
  
  }
  </code></pre>
  
  <h1>ItemListGridAdapter</h1>
  
  <pre><code>public class ItemListGridAdapter extends RecyclerView.Adapter&lt;ItemListGridAdapter.ItemListViewHolder&gt; {
  
      public static final String POSITION = "position";
      private Context mContext;
      private ArrayList&lt;Data&gt; mArrayList = new ArrayList&lt;Data&gt;();
  
      private String mAllFields;
  
      public ItemListGridAdapter(Context context, ArrayList&lt;Data&gt; arrayList, String allfields) {
          mContext = context;
          mArrayList = arrayList;
          mAllFields = allfields;
      }
  
      @Override
      public ItemListViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
          View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_itemlist, parent, false);
  
          ItemListViewHolder viewHolder = new ItemListViewHolder(view);
  
          return viewHolder;
      }
  
      @Override
      public void onBindViewHolder(ItemListViewHolder holder, final int position) {
  
          Data data = mArrayList.get(position);
          holder.mName.setText(data.getName());
          holder.mPrice.setText(data.getPrice());
          holder.mImage.setImageResource(data.getImageId());
          final Bundle bundle = new Bundle();
  
          holder.mRelativeLayout.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View view) {
                  switch (mAllFields) {
                      case "women_clothing":
                          DetailsFragment fragment = new DetailsFragment();
                          bundle.putInt(POSITION, (position + 10));
                          fragment.setArguments(bundle);
                          FragmentManager fragmentManager = ((Activity) mContext).getFragmentManager();
                          FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
                          fragmentTransaction.replace(R.id.home_main_frame, fragment);
                          fragmentTransaction.addToBackStack(null);
                          fragmentTransaction.commit();
  
                          break;
                      case "women_shoes":
                          DetailsFragment fragment1 = new DetailsFragment();
                          bundle.putInt("position", (position + 10));
                          fragment1.setArguments(bundle);
                          FragmentManager fragmentManager1 = ((Activity) mContext).getFragmentManager();
                          FragmentTransaction fragmentTransaction1 = fragmentManager1.beginTransaction();
                          fragmentTransaction1.replace(R.id.home_main_frame, fragment1);
                          fragmentTransaction1.addToBackStack(null);
                          fragmentTransaction1.commit();
  
                          break;
                      case "women_bags":
                          DetailsFragment fragment2 = new DetailsFragment();
                          bundle.putInt("position", (position + 10));
                          fragment2.setArguments(bundle);
                          FragmentManager fragmentManager2 = ((Activity) mContext).getFragmentManager();
                          FragmentTransaction fragmentTransaction2 = fragmentManager2.beginTransaction();
                          fragmentTransaction2.replace(R.id.home_main_frame, fragment2);
                          fragmentTransaction2.addToBackStack(null);
                          fragmentTransaction2.commit();
  
                          break;
                      case "women_watches":
                          DetailsFragment fragment3 = new DetailsFragment();
                          bundle.putInt("position", (position + 10));
                          fragment3.setArguments(bundle);
                          FragmentManager fragmentManager3 = ((Activity) mContext).getFragmentManager();
                          FragmentTransaction fragmentTransaction3 = fragmentManager3.beginTransaction();
                          fragmentTransaction3.replace(R.id.home_main_frame, fragment3);
                          fragmentTransaction3.addToBackStack(null);
                          fragmentTransaction3.commit();
  
                          break;
                      case "women_sunglasses":
                          DetailsFragment fragment4 = new DetailsFragment();
                          bundle.putInt("position", (position + 10));
                          fragment4.setArguments(bundle);
                          FragmentManager fragmentManager4 = ((Activity) mContext).getFragmentManager();
                          FragmentTransaction fragmentTransaction4 = fragmentManager4.beginTransaction();
                          fragmentTransaction4.replace(R.id.home_main_frame, fragment4);
                          fragmentTransaction4.addToBackStack(null);
                          fragmentTransaction4.commit();
  
                          break;
                      case "women_accessories":
                          DetailsFragment fragment5 = new DetailsFragment();
                          bundle.putInt("position", (position + 10));
                          fragment5.setArguments(bundle);
                          FragmentManager fragmentManager5 = ((Activity) mContext).getFragmentManager();
                          FragmentTransaction fragmentTransaction5 = fragmentManager5.beginTransaction();
                          fragmentTransaction5.replace(R.id.home_main_frame, fragment5);
                          fragmentTransaction5.addToBackStack(null);
                          fragmentTransaction5.commit();
  
                          break;
  
                  }
  
              }
          });
  
  
      }
  
      @Override
      public int getItemCount() {
          return mArrayList.size();
      }
  
      public class ItemListViewHolder extends RecyclerView.ViewHolder {
          private TextView mName;
          private TextView mPrice;
          private ImageView mImage;
          private RelativeLayout mRelativeLayout;
  
          public ItemListViewHolder(View itemView) {
              super(itemView);
  
              mName = (TextView) itemView.findViewById(R.id.item_name_text);
              mPrice = (TextView) itemView.findViewById(R.id.item_price_text);
              mImage = (ImageView) itemView.findViewById(R.id.item_image);
              mRelativeLayout = (RelativeLayout) itemView.findViewById(R.id.item_click);
  
  
          }
      }
  }
  </code></pre>
  
  <h1>DetailsFragment</h1>
  
  <pre><code>public class DetailsFragment extends Fragment {
  
      @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container,
                               Bundle savedInstanceState) {
  
          View view = inflater.inflate(R.layout.fragment_details, container, false);
  
          TextView mTitle = (TextView) view.findViewById(R.id.item_details_title);
          TextView mPrice = (TextView) view.findViewById(R.id.item_details_price);
          ImageView mImage = (ImageView) view.findViewById(R.id.item_details_image);
          TextView mDescription = (TextView) view.findViewById(R.id.item_details_description);
  
          int position = getArguments().getInt(ItemListGridAdapter.POSITION);
  
          Toast.makeText(getActivity(), ""+position, Toast.LENGTH_SHORT).show();
  
  
  
          return view;
      }
  </code></pre>