EmojisAdapter.java

package com.alorma.github.emoji;

import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import com.alorma.github.R;
import com.nostra13.universalimageloader.core.ImageLoader;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

public class EmojisAdapter extends RecyclerView.Adapter<EmojisAdapter.EmojiViewHolder> {

  private final List<Emoji> emojis;
  private OnEmojiSelectedListener onEmojiSelectedListener;

  public EmojisAdapter() {
    emojis = new ArrayList<>();
  }

  @Override
  public EmojiViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    return new EmojiViewHolder(
        LayoutInflater.from(parent.getContext()).inflate(R.layout.emoji_row, parent, false));
  }

  @Override
  public void onBindViewHolder(EmojiViewHolder holder, int position) {
    Emoji emoji = emojis.get(position);
    ImageLoader.getInstance().displayImage(emoji.getValue(), holder.icon);
    holder.text.setText(":" + emoji.getKey() + ":");
  }

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

  public void addAll(Collection<Emoji> emojis) {
    this.emojis.addAll(emojis);
    notifyDataSetChanged();
  }

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

  public void setOnEmojiSelectedListener(OnEmojiSelectedListener onEmojiSelectedListener) {
    this.onEmojiSelectedListener = onEmojiSelectedListener;
  }

  public interface OnEmojiSelectedListener {
    void onEmojiSelected(Emoji emoji);
  }

  public class EmojiViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
    private final ImageView icon;
    private final TextView text;

    public EmojiViewHolder(View itemView) {
      super(itemView);
      icon = (ImageView) itemView.findViewById(R.id.icon);
      text = (TextView) itemView.findViewById(R.id.text);

      itemView.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
      if (onEmojiSelectedListener != null) {
        onEmojiSelectedListener.onEmojiSelected(emojis.get(getAdapterPosition()));
      }
    }
  }
}