AlbumAdapter.java

package com.airplayer.adapter;

import android.content.Context;
import android.net.Uri;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.airplayer.R;
import com.airplayer.model.Album;
import com.facebook.drawee.view.SimpleDraweeView;
import com.squareup.picasso.Picasso;

import java.util.List;

/**
 * Created by ZiyiTsang on 15/6/11.
 * an abstract class, which is used by recycler view that shows a album grid view
 * 一个以 grid view 显示专辑类型 item 的抽象类
 */
public class AlbumAdapter extends AirAdapter {

    public AlbumAdapter(Context context, List<Album> list) {
        super(context, list);
    }

    /* implement onCreateItemViewHolder to set up every item view holder */
    /* 通过实现超类 onCreateItemViewHolder 抽象方法 来设置这种 recycler view 的每一个 item */
    @Override
    public AirItemViewHolder onCreateItemViewHolder(ViewGroup parent) {
        return new AlbumItemViewHolder(getLayoutInflater()
                .inflate(R.layout.recycler_item_album, parent, false));
    }

    /* over ride onBindViewHolder to set content in every item/header view */
    /* 重写 onBindViewHolder 来设置每一个 header 或 item 显示的内容 */
    /* 由于 使用 album adapter 的 recyclerView 的item 基本不会改变，而 header 会随时改变
     * 所以把 item 的 内容配置放在这里，而 header 则通过调用超类的抽象方法实现 */

    @Override
    public void onBindItemViewHolder(AirItemViewHolder itemHolder, int position) {
        AlbumItemViewHolder albumViewHolder = (AlbumItemViewHolder) itemHolder;
        Album item = (Album) getList().get(position - 1);
        albumViewHolder.textView.setText(item.getTitle());
        albumViewHolder.artistText.setText(item.getAlbumArtist());
        albumViewHolder.draweeView.setImageURI(item.getAlbumArtUri());
    }

    // item holder which would not change in sub class
    public class AlbumItemViewHolder extends AirItemViewHolder {
        SimpleDraweeView draweeView;
        TextView textView;
        TextView artistText;

        public AlbumItemViewHolder(View itemView) {
            super(itemView);
            draweeView = (SimpleDraweeView) itemView.findViewById(R.id.album_art);
            textView = (TextView) itemView.findViewById(R.id.album_title);
            artistText = (TextView) itemView.findViewById(R.id.album_artist_name);
        }
    }
}