RecycleView 列表显示更多.md

 <TextView
        android:id="@+id/tv_share_item_content"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ellipsize="end"
        android:maxLines="3"
        android:textSize="16sp"
        android:padding="16dp"
        tools:text="Autumn mountain cheshen!!"/>

Adapter实现

public class DiscoverAdapter extends RecyclerView.Adapter<DiscoverAdapter.ItemView> {

    private SparseBooleanArray expandStates = new SparseBooleanArray();
    private List<ShareInfo> data;
    private RvItemClickListener itemClickListener;


    public DiscoverAdapter(RvItemClickListener itemClickListener) {
        this.data = new ArrayList<>();
        this.itemClickListener = itemClickListener;
    }

    public void addHead(List<ShareInfo> newData) {
        data.addAll(0, newData);
        notifyItemRangeInserted(0, newData.size());
    }

    public void addFooter(List<ShareInfo> newData) {
        data.addAll(newData);
        int size = data.size() - 1;
        notifyItemInserted(size);
    }

    public void setData(List<ShareInfo> data) {
        this.data = data;
        notifyDataSetChanged();
    }

    public List<ShareInfo> getData() {
        return data;
    }

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

    @Override
    public void onBindViewHolder(ItemView holder, int position) {
        ShareInfo item = data.get(position);   
        holder.contentTv.setText(item.getTitle());
        holder.contentTv.setTag(position);
        holder.contentTv.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                TextView expandTv = (TextView) v;
                int pos = (int) expandTv.getTag();
                expandTv.setMaxLines(100);
                expandStates.put(pos, true);
            }
        });
        if (expandStates.get(position)) {
            holder.contentTv.setMaxLines(100);
        }
    }

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

    public class ItemView extends RecyclerView.ViewHolder implements View.OnClickListener {

        private TextView contentTv;


        public ItemView(View itemView) {
            super(itemView);
            contentTv = (TextView) itemView.findViewById(R.id.tv_share_item_content);
            itemView.setOnClickListener(this);
        }

        @Override
        public void onClick(View v) {
            itemClickListener.onItemClick(v, this.getLayoutPosition());
        }
    }
}