java - 如何将 BaseAdapter 转换为 RecyclerAdapter

Question

所以我想将我的 GridView 更改为 RecyclerView，因此我必须将我的 BaseAdapter 更改为 RecyclerAdapter。我已经尝试进行更改，但我不知道如何将代码切换到 RecyclerAdapter 中。这是我的 BaseAdapter 的样子:

class AlbumAdapter extends BaseAdapter {
    private Activity activity;
    private ArrayList<HashMap< String, String >> data;
    public AlbumAdapter(Activity a, ArrayList < HashMap < String, String >> d) {
        activity = a;
        data = d;
    }
    public int getCount() {
        return data.size();
    }
    public Object getItem(int position) {
        return position;
    }
    public long getItemId(int position) {
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        AlbumViewHolder holder = null;
        if (convertView == null) {
            holder = new AlbumViewHolder();
            convertView = LayoutInflater.from(activity).inflate(
                    R.layout.album_row, parent, false);

            holder.galleryImage = (ImageView) convertView.findViewById(R.id.galleryImage);
            holder.gallery_count = (TextView) convertView.findViewById(R.id.gallery_count);
            holder.gallery_title = (TextView) convertView.findViewById(R.id.gallery_title);

            convertView.setTag(holder);
        } else {
            holder = (AlbumViewHolder) convertView.getTag();
        }
        holder.galleryImage.setId(position);
        holder.gallery_count.setId(position);
        holder.gallery_title.setId(position);

        HashMap < String, String > song = new HashMap < String, String > ();
        song = data.get(position);
        try {
            holder.gallery_title.setText(song.get(Function.KEY_ALBUM));
            holder.gallery_count.setText(song.get(Function.KEY_COUNT));

            Glide.with(activity)
                    .load(new File(song.get(Function.KEY_PATH))) // Uri of the picture
                    .into(holder.galleryImage);

        } catch (Exception e) {}
        return convertView;
    }
}


class AlbumViewHolder {
    ImageView galleryImage;
    TextView gallery_count, gallery_title;
}

提前致谢!

Answer 1

Simply use this, feel free to modify to suit your need, make sure to read the comments as they really will help you understand few things.

public class AlbumAdapter extends RecyclerView.Adapter<AlbumAdapter.ViewHolder> {

    private static final String KEY_ALBUM = "KEY_ALBUM";
    private static final String KEY_COUNT = "KEY_COUNT";
    private static final String KEY_PATH = "KEY_PATH";

    private itemClickInterface clickInterface;
    //private List<String> data;
    private ArrayList<HashMap<String, String >> data;

//    public AlbumAdapter(itemClickInterface clickInterface, List<String> data) { // Forget about this if your data is not an array of Strings.
//    public AlbumAdapter(itemClickInterface clickInterface, ArrayList<HashMap< String, String >> data) { // Forget about this if you're not ready to pass an onclick interface
    public AlbumAdapter(ArrayList<HashMap< String, String >> data) {
        this.data = data;
//        this.clickInterface = clickInterface; //Simply ignore since you're not passing an interface of clicklister
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.album_row, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(final ViewHolder holder, int position) {
        try {
            final String data_for_albums = this.data.get(position).get(KEY_ALBUM);
            final String data_for_counts = this.data.get(position).get(KEY_COUNT);
            final String data_for_paths = this.data.get(position).get(KEY_PATH);

            holder.gallery_title.setText(data_for_albums);
            holder.gallery_count.setText(data_for_counts);

            Glide.with(activity)
                    .load(new File(data_for_paths)) // Uri of the picture
                    .into(holder.galleryImage);



            /*
            * You can modify this as you want.
            * */
//            holder.galleryImage.setOnClickListener(new View.OnClickListener() {
//                @Override
//                public void onClick(View v) {
//                    clickInterface.click(data_for_paths); // This depends on you.
//                }
//            });

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

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

    /*--------------------------------------------------------------------------------------
     |                          GET REFERENCES TO VIEWS HERE
     *--------------------------------------------------------------------------------------*/
    class ViewHolder extends RecyclerView.ViewHolder {
        ImageView galleryImage;
        TextView gallery_count, gallery_title;

        ViewHolder(View itemView) {
            super(itemView);
            galleryImage = itemView.findViewById(R.id.galleryImage);
            gallery_count = itemView.findViewById(R.id.gallery_count);
            gallery_title = itemView.findViewById(R.id.gallery_title);
        }
    }
}

How to call from our activity

ArrayList<HashMap<String, String >> data = new ArrayList<>();
        //I'm assuming you already feed your data, so you're not passing null like me here.

        cardlistview = findViewById(R.id.cardlistview);

        albumAdapter = new AlbumAdapter(your_arraysOfHashMap);
        RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
        cardlistview.setLayoutManager(mLayoutManager);
        cardlistview.setAdapter(albumAdapter);