Shopify sdk provides interface to get the saved categories of store on shopify and you can get that in your android app. you can show lots of information in list view like image of product, name, date, price etc.

1. Activity class to show categories list :

public class CollectoinsListActivity extends AppCompatActivity implements ShopifyOperationInterface {

    private ArrayList<Collection> mArrayList;
    private RecyclerView rvCollections;
    private RecyclerView.Adapter mAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_collectoins_list);

        TextView tvTitle = (TextView) findViewById(R.id.tvTitle);
        rvCollections = (RecyclerView)findViewById(R.id.rvCollections);
        rvCollections.setHasFixedSize(true);
        RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(CollectoinsListActivity.this);
        rvCollections.setLayoutManager(mLayoutManager);
        rvCollections.setItemAnimator(new DefaultItemAnimator());
        tvTitle.setText(AppConstant.sBuyWine);

        mArrayList = ShopifyOperationsHandler.getCategoriesList(CollectoinsListActivity.this);
    }

    @Override
    public void success(String aType) {

        if (aType.equalsIgnoreCase(CollectoinsListActivity.class.getName())) {
            Log.e("list size:", mArrayList.size() + "");
            if (mArrayList != null && mArrayList.size() > 0) {
                mAdapter = new AdapterCollectionsList(mArrayList, CollectoinsListActivity.this);
                rvCollections.setAdapter(mAdapter);
            }
        }
    }

}

2. Adapter class to adapt items in list :

public class AdapterCollectionsList extends RecyclerView.Adapter<AdapterCollectionsList.MyViewHolder> {

    private ArrayList<Collection> mCollectionList;
    private Activity mActivity;

    public AdapterCollectionsList(ArrayList<Collection> aCollectionList,Activity aActivity){
        mCollectionList = aCollectionList;
        mActivity = aActivity;
    }

    public static class MyViewHolder extends RecyclerView.ViewHolder {
        TextView tvCollectionName;
        ImageView imgCollection;
        ProgressBar progressbarCollections;

        public MyViewHolder(View itemView) {
            super(itemView);
            this.tvCollectionName = (TextView) itemView.findViewById(R.id.tvCollectionName);
            this.imgCollection = (ImageView) itemView.findViewById(R.id.imgCollection);
            this.progressbarCollections = (ProgressBar) itemView.findViewById(R.id.progressbarCollections);
        }
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent,int viewType) {
        View view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.item_collections, parent, false);

        MyViewHolder myViewHolder = new MyViewHolder(view);

        return myViewHolder;
    }

    @Override
    public void onBindViewHolder(final MyViewHolder holder, final int listPosition) {

        TextView tvCollectionName = holder.tvCollectionName;
        ImageView imgCollection = holder.imgCollection;
        final ProgressBar progressBar = holder.progressbarCollections;
        tvCollectionName.setText(mCollectionList.get(listPosition).getTitle());
    }

    @Override
    public int getItemCount() {
        return mCollectionList.size();
    }
}

3. Create recycler view accordingly in main activity layout and this is item layout file :

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_marginTop="@dimen/padding_ten"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <ImageView
        android:layout_width="match_parent"
        android:id="@+id/imgCollection"
        android:scaleType="fitXY"
        android:background="@drawable/lastcall"
        android:layout_height="@dimen/collection_img_height" />

    <RelativeLayout
        android:layout_width="match_parent"
        android:background="@color/colorTransparentLight"
        android:layout_centerInParent="true"
        android:gravity="center"
        android:orientation="horizontal"
        android:layout_height="@dimen/collection_img_height">

        <TextView
            android:layout_width="match_parent"
            android:id="@+id/tvCollectionName"
            android:textSize="@dimen/text_size_large"
            android:text="sample"
            android:gravity="center"
            android:textColor="@color/white"
            android:textStyle="bold"
            android:layout_height="@dimen/collection_img_height"/>

        <ImageView
            android:layout_width="wrap_content"
            android:id="@+id/imgNext"
            android:scaleType="fitXY"
            android:layout_marginRight="@dimen/padding_ten"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            android:background="@drawable/arrow"
            android:layout_height="wrap_content" />

        <ProgressBar
            android:id="@+id/progressbarCollections"
            android:layout_width="wrap_content"
            android:layout_centerInParent="true"
            android:background ="@drawable/progress"
            android:layout_height="wrap_content" />

    </RelativeLayout>
</RelativeLayout>

4. Method to fetch categories list :

public static ProgressDialog mProgressDialog;

public static ArrayList<Collection> getCategoriesList(final Activity aActivity) {

    final ArrayList<Collection> mArrayList = new ArrayList<>();
    final ShopifyOperationInterface mShopifyOperationInterface = (ShopifyOperationInterface)aActivity;

    initializeProgress(aActivity);

    showProgress(aActivity);

    SampleApplication.getBuyClient().getCollections(1, new Callback<List<Collection>>() {

        @Override
        public void success(List<Collection> collections) {
            Log.e("collections list size:", collections.size() + "");

            if (collections.size() > 0) {
                for (int i = 0; i < collections.size(); i++) {
                    Log.e("collections id:", collections.get(i).getCollectionId() + "");
                    Log.e("collections id:", collections.get(i).getTitle() + "");
                    Log.e("collections id:", collections.get(i).getHtmlDescription() + "");
                    Log.e("collections id:", collections.get(i).getImageUrl() + "");
                    Log.e("collections id:", collections.get(i).getPublishedAtDate() + "");

                    mArrayList.add(collections.get(i));
                }
            }
            mShopifyOperationInterface.success(CollectoinsListActivity.class.getName());
        }

        @Override
        public void failure(BuyClientError error) {
            Log.e("collections error:", error.getMessage());
            dismissProgress(aActivity);
        }
    });
    dismissProgress(aActivity);

    return mArrayList;

}

In our next tutorial we will fetch product of particular category.