title: RecyclerView with GridLayoutManager and Picasso showing wrong image
body: <p><strong>Update #1</strong></p>
  
  <p>Added hasStableIds(true) and updated Picasso to version 2.5.2.
  It does not solve the issue.</p>
  
  <p><strong>Reproduction:</strong></p>
  
  <p>RecyclerView with GridLayoutManager (spanCount = 3).
  List items are CardViews with ImageView inside.</p>
  
  <p>When all the items does not fit the screen calling notifyItemChanged on one item causes more than one calls to onBindViewHolder().
  One call is for position from notifyItemChanged others for items not visible on the screen.</p>
  
  <p><strong>Issue:</strong></p>
  
  <p>Sometimes the item at position passed to the notifyItemChanged is loaded with an image belonging to an item that is not on the screen (most likely due to recycling of the view holder - although I would assume that if the item remains in place then the passed viewholder would be the same).</p>
  
  <p>I have found Jake's comment on other issue here about calling load() even if the file/uri is null. Image is loaded on every onBindViewHolder here.</p>
  
  <p><strong>Simple sample app:</strong></p>
  
  <pre><code>git clone https://github.com/gswierczynski/recycler-view-grid-layout-with-picasso.git
  </code></pre>
  
  <p>Tap on an item calls notifyItemChanged with parameter equal to the position of that item.</p>
  
  <p><strong>Code:</strong></p>
  
  <pre><code>public class MainActivity extends ActionBarActivity {
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
          if (savedInstanceState == null) {
              getSupportFragmentManager().beginTransaction()
                      .add(R.id.container, new PlaceholderFragment())
                      .commit();
          }
      }
  
      public static class PlaceholderFragment extends Fragment {
  
          public PlaceholderFragment() {
          }
  
          @Override
          public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                   Bundle savedInstanceState) {
              View rootView = inflater.inflate(R.layout.fragment_main, container, false);
  
              RecyclerView rv = (RecyclerView) rootView.findViewById(R.id.rv);
  
              rv.setLayoutManager(new GridLayoutManager(getActivity(), 3));
              rv.setItemAnimator(new DefaultItemAnimator());
              rv.setAdapter(new ImageAdapter());
  
              return rootView;
          }
      }
  
      private static class ImageAdapter extends RecyclerView.Adapter&lt;ImageViewHolder&gt; implements ClickableViewHolder.OnClickListener {
  
          public static final String TAG = "ImageAdapter";
          List&lt;Integer&gt; resourceIds = Arrays.asList(
                  R.drawable.a0,
                  R.drawable.a1,
                  R.drawable.a2,
                  R.drawable.a3,
                  R.drawable.a4,
                  R.drawable.a5,
                  R.drawable.a6,
                  R.drawable.a7,
                  R.drawable.a8,
                  R.drawable.a9,
                  R.drawable.a10,
                  R.drawable.a11,
                  R.drawable.a12,
                  R.drawable.a13,
                  R.drawable.a14,
                  R.drawable.a15,
                  R.drawable.a16,
                  R.drawable.a17,
                  R.drawable.a18,
                  R.drawable.a19,
                  R.drawable.a20);
  
          @Override
          public ImageViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
              View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item, parent, false);
              return new ImageViewHolder(v, this);
          }
  
          @Override
          public void onBindViewHolder(ImageViewHolder holder, int position) {
              Log.d(TAG, "onBindViewHolder position: " + position + " | holder obj:" + holder.toString());
              Picasso.with(holder.iv.getContext())
                      .load(resourceIds.get(position))
                      .fit()
                      .centerInside()
                      .into(holder.iv);
          }
  
          @Override
          public int getItemCount() {
              return resourceIds.size();
          }
  
          @Override
          public void onClick(View view, int position) {
              Log.d(TAG, "onClick position: " + position);
              notifyItemChanged(position);
          }
  
          @Override
          public boolean onLongClick(View view, int position) {
              return false;
          }
      }
  
      private static class ImageViewHolder extends ClickableViewHolder {
  
          public ImageView iv;
  
          public ImageViewHolder(View itemView, OnClickListener onClickListener) {
              super(itemView, onClickListener);
              iv = (ImageView) itemView.findViewById(R.id.iv);
          }
      }
  }
  
  public class ClickableViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener, View.OnLongClickListener {
      OnClickListener onClickListener;
  
  
      public ClickableViewHolder(View itemView, OnClickListener onClickListener) {
          super(itemView);
          this.onClickListener = onClickListener;
          itemView.setOnClickListener(this);
          itemView.setOnLongClickListener(this);
      }
  
      @Override
      public void onClick(View view) {
          onClickListener.onClick(view, getPosition());
      }
  
      @Override
      public boolean onLongClick(View view) {
          return onClickListener.onLongClick(view, getPosition());
      }
  
      public static interface OnClickListener {
          void onClick(View view, int position);
          boolean onLongClick(View view, int position);
      }
  }
  </code></pre>