BaseRecyclerViewAdapter Android

BaseAdapter.java

/**
 * @author Yuana andhikayuana@gmail.com
 * @since Jun, Sun 10 2018 13.44
 **/
public abstract class BaseAdapter<T, V extends BaseViewHolder> extends RecyclerView.Adapter<V> {

    protected List<T> data = new ArrayList<T>();
    protected Context context;
    protected OnItemClickListener itemClickListener;
    protected OnLongItemClickListener longItemClickListener;

    public BaseAdapter(Context context) {
        this.context = context;
    }

    public void setOnItemClickListener(OnItemClickListener itemClickListener) {
        this.itemClickListener = itemClickListener;
    }

    public void setOnLongItemClickListener(OnLongItemClickListener longItemClickListener) {
        this.longItemClickListener = longItemClickListener;
    }

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

    public T get(int position) {
        return data.get(position);
    }

    public void replaceData(List<T> items) {
        data.clear();
        add(items);
    }

    public void add(T item) {
        data.add(item);
        notifyItemInserted(data.size() - 1);
    }

    public void add(T item, int position) {
        data.add(position, item);
        notifyItemInserted(position);
    }

    public void add(List<T> items) {
        for (T item : items) {
            data.add(item);
        }
        notifyDataSetChanged();
    }

    public void add(T[] items) {
        add(Arrays.asList(items));
        notifyDataSetChanged();
    }

    public void addOrUpdate(T item) {
        int i = data.indexOf(item);
        if (i >= 0) {
            data.set(i, item);
            notifyItemChanged(i);
        } else {
            add(item);
        }
    }

    public void addOrUpdate(List<T> items) {
        for (T item : items) {
            addOrUpdate(item);
        }
        notifyDataSetChanged();
    }

    public void remove(int position) {
        if (position >= 0 && position < data.size()) {
            data.remove(position);
            notifyItemRemoved(position);
        }
    }

    public void remove(T item) {
        int position = data.indexOf(item);
        remove(position);
    }

    public void clear() {
        data.clear();
        notifyDataSetChanged();
    }

    @Override
    public V onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(setItemView(viewType), parent, false);
        return initViewHolder(view, viewType);
    }

    protected abstract V initViewHolder(View view, int viewType);

    @Override
    public void onBindViewHolder(V holder, int position) {
        holder.bind(get(position));
    }

    @LayoutRes
    protected abstract int setItemView(int viewType);
}

BaseViewHolder.java

/**
 * @author Yuana andhikayuana@gmail.com
 * @since Jul, Sun 22 2018 17.34
 **/
public abstract class BaseViewHolder<T> extends RecyclerView.ViewHolder implements
        View.OnClickListener,
        View.OnLongClickListener {

    private OnItemClickListener itemClickListener;
    private OnLongItemClickListener longItemClickListener;


    public BaseViewHolder(View itemView) {
        super(itemView);
    }

    public BaseViewHolder(View itemView,
                          OnItemClickListener itemClickListener,
                          OnLongItemClickListener longItemClickListener) {
        super(itemView);
        this.itemClickListener = itemClickListener;
        this.longItemClickListener = longItemClickListener;
        itemView.setOnClickListener(this);
        itemView.setOnLongClickListener(this);
    }

    public abstract void bind(T item);

    @Override
    public void onClick(View v) {
        if (itemClickListener != null) {
            itemClickListener.onItemClick(v, getAdapterPosition());
        }
    }

    @Override
    public boolean onLongClick(View v) {
        if (longItemClickListener != null) {
            longItemClickListener.onLongItemClick(v, getAdapterPosition());
            return true;
        }
        return false;
    }
}

OnItemClickListener.java

/**
 * @author Yuana andhikayuana@gmail.com
 * @since Jul, Sun 22 2018 17.34
 **/
public interface OnItemClickListener {
    void onItemClick(View view, int position);
}

OnLongItemClickListener.java

/**
 * @author Yuana andhikayuana@gmail.com
 * @since Jul, Sun 22 2018 17.34
 **/
public interface OnLongItemClickListener {
    void onLongItemClick(View view, int position);
}

SortedAdapter.java

/**
 * @author Yuana andhikayuana@gmail.com
 * @since Jun, Sun 10 2018 13.45
 **/
public abstract class SortedAdapter<T, H extends BaseViewHolder> extends RecyclerView.Adapter<H> {

    // TODO: 11/06/18
    protected Context context;
    protected SortedList<T> data;
    protected OnItemClickListener itemClickListener;
    protected OnLongItemClickListener longItemClickListener;

    public SortedAdapter(Context context) {
        this.context = context;
        data = new SortedList<>(getItemClass(), new SortedList.Callback<T>() {
            @Override
            public int compare(T lhs, T rhs) {
                return SortedAdapter.this.compare(lhs, rhs);
            }

            @Override
            public void onInserted(int position, int count) {
            }

            @Override
            public void onRemoved(int position, int count) {
            }

            @Override
            public void onMoved(int fromPosition, int toPosition) {
                notifyItemMoved(fromPosition, toPosition);
                notifyItemChanged(toPosition);
            }

            @Override
            public void onChanged(int position, int count) {
            }

            @Override
            public boolean areContentsTheSame(T oldItem, T newItem) {
                return oldItem.equals(newItem);
            }

            @Override
            public boolean areItemsTheSame(T oldItem, T newItem) {
                return oldItem.equals(newItem);
            }
        });
    }

    protected abstract Class<T> getItemClass();

    protected abstract int compare(T lhs, T rhs);

    protected View getView(ViewGroup parent, int viewType) {
        return LayoutInflater.from(context).inflate(getItemResourceLayout(viewType), parent, false);
    }

    protected abstract int getItemResourceLayout(int viewType);

    @Override
    public abstract H onCreateViewHolder(ViewGroup parent, int viewType);

    @Override
    public void onBindViewHolder(H holder, int position) {
        holder.bind(data.get(position));
    }

    @Override
    public int getItemCount() {
        try {
            return data.size();
        } catch (Exception e) {
            return 0;
        }
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    public void setOnItemClickListener(OnItemClickListener itemClickListener) {
        this.itemClickListener = itemClickListener;
    }

    public void setOnLongItemClickListener(OnLongItemClickListener longItemClickListener) {
        this.longItemClickListener = longItemClickListener;
    }

    public SortedList<T> getData() {
        return data;
    }

    public T get(int position) {
        return getData().get(position);
    }

    public boolean isEmpty() {
        return data.size() < 1;
    }

    public int add(T item) {
        int i = data.add(item);
        notifyItemInserted(i);
        return i;
    }

    public void add(final List<T> items) {
        data.addAll(items);
        notifyDataSetChanged();
    }

    public void addOrUpdate(T item) {
        int i = findPosition(item);
        if (i >= 0) {
            data.updateItemAt(i, item);
            notifyItemChanged(i);
        } else {
            add(item);
        }
    }

    public void addOrUpdate(final List<T> items) {
        for (T item : items) {
            int i = findPosition(item);
            if (i >= 0) {
                data.updateItemAt(i, item);
            } else {
                data.add(item);
            }
        }
        notifyDataSetChanged();
    }

    public void refreshWithData(List<T> items) {
        data.clear();
        data.addAll(items);
        notifyDataSetChanged();
    }

    public void remove(int position) {
        if (position >= 0 && position < data.size()) {
            data.removeItemAt(position);
            notifyItemRemoved(position);
        }
    }

    public void remove(T item) {
        int position = findPosition(item);
        remove(position);
    }

    public void clear() {
        data.clear();
    }

    public int findPosition(T item) {
        if (data == null) {
            return -1;
        }

        int size = data.size() - 1;
        for (int i = size; i >= 0; i--) {
            if (data.get(i).equals(item)) {
                return i;
            }
        }

        return -1;
    }

}

how to use this adapter in activity

oh hai @rohitnotes
you need to copy above class to your android code, and then when you to create an adapter, you just extend from the above class.