Recycleview Setup

BaseAdapter.java

public abstract class BaseAdapter< T extends RecyclerView.ViewHolder> extends RecyclerView.Adapter<T> {


    protected static final int ITEM_VIEW_TYPE_ITEM = 1;
    protected boolean animateItemsOnScroll = true;
    protected int defaultItemAnimationDuration = 0;
    protected int lastAnimatedPosition = -1;
    protected long nextAnimationStartTime;
    protected static final int ANIMATION_DELAY_INTERVAL = 50;
    protected final Handler handler = new Handler(Looper.getMainLooper());
    public Activity mactivity;

    BaseAdapter(Activity activity){
        mactivity = activity;

        if (defaultItemAnimationDuration == 0) {
            defaultItemAnimationDuration = mactivity.getResources().getInteger(android.R.integer.config_mediumAnimTime);
        }
    }



    @Override
    public int getItemViewType(int position) {
        return  ITEM_VIEW_TYPE_ITEM;
    }


    protected AnimationDirection getAnimationDirection() {
        return AnimationDirection.UpFromBottom;
    }


    protected void runAnimation(final RecyclerView.ViewHolder targetViewHolder,
                                final int position,
                                final int duration,
                                final AnimationDirection animationDirection) {
        if (animateItemsOnScroll) {
            final float maxAlpha = 1f;
            final View targetView = targetViewHolder.itemView;

            // Don't actually run the animation right a way. This gives a nice effect
            // when adding a large batch of items.
            if (position > lastAnimatedPosition) {
                int delay = 0;
                long currTime = System.currentTimeMillis();
                if (currTime < nextAnimationStartTime + ANIMATION_DELAY_INTERVAL) {
                    delay = (int) ((nextAnimationStartTime + ANIMATION_DELAY_INTERVAL) - currTime);
                }
                nextAnimationStartTime = currTime + delay;

                targetView.setAlpha(0);
                switch (animationDirection) {
                    case UpFromBottom:
                        targetView.setTranslationY(500.0f);
                        break;
                    case DownFromTop:
                        targetView.setTranslationY(-500.0f);
                        break;
                    case InFromLeft:
                        targetView.setTranslationX(500.0f);
                        break;
                    case InFromRight:
                        targetView.setTranslationX(-500.0f);
                        break;
                }
                handler.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        switch (animationDirection) {
                            case DownFromTop:
                            case UpFromBottom:
                                targetView.animate().alpha(maxAlpha).translationY(0).setDuration(duration);
                                break;
                            case InFromRight:
                            case InFromLeft:
                                targetView.animate().alpha(maxAlpha).translationX(0).setDuration(duration);
                                break;
                        }
                        targetView.animate().setInterpolator(new LinearOutSlowInInterpolator());
                        targetView.animate().start();
                    }
                }, delay);
                lastAnimatedPosition = position;
            }
        }
    }

    public enum AnimationDirection {
        UpFromBottom,
        DownFromTop,
        InFromLeft,
        InFromRight,
    }

}

GroupMarginDecoration.java

public class GroupMarginDecoration extends RecyclerView.ItemDecoration{

        private int margin;
        private int headerbottommargin;


        public GroupMarginDecoration(Context context) {
            margin = context.getResources().getDimensionPixelSize(R.dimen.item_margin);
            headerbottommargin = context.getResources().getDimensionPixelSize(R.dimen.header_bottom_margin);
        }

        @Override
        public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {

            if(parent.getChildAdapterPosition(view)==0){
                outRect.set(margin, headerbottommargin, margin, headerbottommargin);
            }
            else
                outRect.set(margin, margin, margin, margin);

        }


    }

list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    card_view:cardCornerRadius="2dp"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    card_view:contentPadding="2dp"
    android:background="?android:selectableItemBackground"
    >


    <com.example.empire.empire.widgets.SquareImageView
        android:id="@+id/countryImage"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:scaleType="centerCrop"
        android:layout_centerInParent="true"
        />


</android.support.v7.widget.CardView> 

main_layout.xml

 <android.support.v7.widget.RecyclerView
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/product_list_detail"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:clipToPadding="false"/>

MainActivity.java

      @BindView(R.id.product_list_detail)
    RecyclerView recyclerView;
    ProductListAdapter adapter;
      
      
       recyclerView.addItemDecoration(new GroupMarginDecoration(this));
        recyclerView.setHasFixedSize(true);
        final GridLayoutManager manager = new GridLayoutManager(this, 3);
        recyclerView.setLayoutManager(manager);
        
                              adapter = new ProductListAdapter(null,
                                images,
                                ProductListDetailActivity.this,
                                ProductListAdapter.PRODUCT_LIST_DETAIL);

                        recyclerView.setAdapter(adapter);
                        
                        
                        

ProductListAdapter.java

public class ProductListAdapter extends BaseAdapter<ProductListAdapter.TextViewHolder> {


    public static final int PRODUCT_LIST = 1;
    public static final int PRODUCT_LIST_DETAIL = 2;

    public Activity mactivity;

    ArrayList<ProductImages> mproductImages;
    ArrayList<Product> mproduct_list;


    int mAdapterType = PRODUCT_LIST;


    public ProductListAdapter(ArrayList<Product> product_list ,ArrayList<ProductImages> productImages , Activity activity,int AdapterType) {
        super(activity);

        mproduct_list = product_list;
        mproductImages = productImages;
        mactivity =  activity;
        mAdapterType = AdapterType;

    }




    @Override
    public TextViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {


        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.product_grid_item, parent, false);

        return new TextViewHolder(view);
    }




    @Override
    public void onBindViewHolder(final TextViewHolder holder, final int position) {



         String url = null;

        if(mAdapterType == PRODUCT_LIST)
        {
            final Product product = mproduct_list.get(position);
            if (product != null) {
                if (product.product_images != null) {
                    if (product.product_images.size() > 0) {

                        url = product.product_images.get(0).url;


                    }
                }
            }
        }
        else if(mAdapterType == PRODUCT_LIST_DETAIL) {

            url = mproductImages.get(position).url;


        }


        final String murl = url;

        Picasso.with(mactivity).load(murl).placeholder(R.drawable.placeholder).resize(100, 100).networkPolicy(NetworkPolicy.OFFLINE).into(holder.imageView, new Callback() {
            @Override
            public void onSuccess() {

            }

            @Override
            public void onError() {
                Picasso.with(mactivity).
                        load(murl).placeholder(R.drawable.placeholder).
                        resize(100, 100).into(holder.imageView);


            }
        });



        runAnimation(holder, position, defaultItemAnimationDuration, getAnimationDirection());
    }



    @Override
    public int getItemCount()
    {
        if(mAdapterType == PRODUCT_LIST){
            return mproduct_list.size();
        }
        else  {

            return mproductImages.size();
        }


    }


    public  class TextViewHolder extends RecyclerView.ViewHolder  {

        @BindView(R.id.countryImage)
        protected SquareImageView imageView;

        public TextViewHolder(View itemView) {
            super(itemView);
            ButterKnife.bind(this,itemView);


            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {


             if(mAdapterType == PRODUCT_LIST_DETAIL) {

                 String URL = mproductImages.get(getAdapterPosition()).url;
                 Intent returnIntent = new Intent();
                 returnIntent.putExtra("url",URL);
                 mactivity.setResult(Activity.RESULT_OK, returnIntent);
                 mactivity.finish();

             }
             else if(mAdapterType == PRODUCT_LIST){

                 Intent returnIntent = new Intent(mactivity, ProductListDetailActivity.class);
                 returnIntent.putExtra("product_id",mproduct_list.get(getAdapterPosition()).product_id);
                 returnIntent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
                 mactivity.startActivity(returnIntent);
                 mactivity.finish();


                    }

                }
            });




        }
    }


}