如何在没有3rd-Libraries的情况下向Recyclerview添加快速滚动滚动条

时间:2016-04-03 15:16:10

标签: java android android-recyclerview fastscroll

我想在我的RecyclerView中添加Fast-Scroll-Feature(如在Android联系人应用程序或Whatsapp联系人中)?

我也会使用列表视图,但我的应用程序需要Cards在同一版面上!

如果实施快速滚动到Recyclerview太难了,使用ViewStub也是一种选择吗?

我的RecyclerViewAdapter:

public class SongRecyclerViewAdapter extends RecyclerView.Adapter<SongRecyclerViewAdapter.Holder> {
    private Song[] sSongs;

    public SongRecyclerViewAdapter(Song[] songs) {
        sSongs = songs;
    }

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

        Holder holder = new Holder(view);

        return holder;
    }

    @Override
    public void onBindViewHolder(Holder holder, int position) {
        //holder.imvSong.setImageResource(R.drawable.standardartwork);
        holder.txvSongTitle.setText(sSongs[position].getTitle());
        holder.txvSongInfo.setText(sSongs[position].getArtists());
    }

    @Override
    public int getItemCount() {
        return sSongs != null ? sSongs.length : 0;
    }

    public class Holder extends RecyclerView.ViewHolder {
        LinearLayout linearLayout;
        ImageView imvSong;
        TextView txvSongTitle;
        TextView txvSongInfo;

        public Holder(View layout) {
            super(layout);

            linearLayout = (LinearLayout) layout;

            imvSong = (ImageView) layout.findViewById(R.id.imvSong);
            txvSongTitle = (TextView) layout.findViewById(R.id.adap_txvSongtitle);
            txvSongInfo = (TextView) layout.findViewById(R.id.txvSongInfo);
        }
    }
}

谢谢!

1 个答案:

答案 0 :(得分:0)

代码中的问题是注释行:

join

要解决这个问题,你有2个解决方案:

1)如果你有少量的已知图像,你可以在初始化时创建一次位图/绘图,然后你只需要引用它们。

2)创建位图缓存,智能方式解码位图以及可重复使用的位图池和池化机制。这不是微不足道的,这就是第三方图书馆为您所做的。我不建议你自己实施它。