带有节标题的Listview

Question

我正在制作一份显示餐馆订单的列表视图。

如您所见，每行有4个项目：

1. 单位
2. 文章+小组
3. 单价
4. 总价

我需要创建节标题以按组对项目进行分组。

在这种情况下，结果列表应如下所示：

FIRST

1 CAMPARI-RICARD。 3.50 3.50

弧形

1儿童菜单15.50 15.50

饮料

4 LEMONADE HOME。 3.30 3.30

1 CAMPARI-RICARD。 3.50 3.50

这是我的适配器代码：

  public class MyAppAdapter extends BaseAdapter         //has a class viewholder which holds
    {
        public class ViewHolder {
            TextView txtUnidades,txtArticulo,txtPrecio, txtBaseImponible;
            ImageView imageView;
        }

        public List<ListaLineasTicket> parkingList;

        public Context context;
        ArrayList<ListaLineasTicket> arraylist;

        private MyAppAdapter(List<ListaLineasTicket> apps, Context context) {
            this.parkingList = apps;
            this.context = context;
            arraylist = new ArrayList<ListaLineasTicket>();
            arraylist.clear();
            arraylist.addAll(parkingList);
        }

        @Override
        public int getCount() {
            return parkingList.size();
        }

        @Override
        public Object getItem(int position) {
            return position;
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(final int position, View convertView, ViewGroup parent) // inflating the layout and initializing widgets
        {

            View rowView = convertView;
            MyAppAdapter.ViewHolder viewHolder = null;
            if (rowView == null) {
                LayoutInflater inflater = getLayoutInflater();
                rowView = inflater.inflate(R.layout.list_content_lineas_ticket, parent, false);
                viewHolder = new MyAppAdapter.ViewHolder();
                viewHolder.txtUnidades = (TextView) rowView.findViewById(R.id.txtUnidades);
                viewHolder.txtArticulo = (TextView) rowView.findViewById(R.id.txtArticulo);
                viewHolder.txtPrecio = (TextView) rowView.findViewById(R.id.txtPrecio);
                viewHolder.txtBaseImponible = (TextView) rowView.findViewById(R.id.txtBaseImponible);


                rowView.setTag(viewHolder);
            } else {
                viewHolder = (MyAppAdapter.ViewHolder) convertView.getTag();
            }
            // here setting up names and images



            String unidades = parkingList.get(position).getUnidades();

            String filename = unidades;     // full file name
            String[] parts = filename.split("\\."); // String array, each element is text between dots

            String beforeFirstDot = parts[0];
            System.out.println( "hola  dos lineas unidades "+ beforeFirstDot );

            viewHolder.txtUnidades.setText(beforeFirstDot );
            viewHolder.txtArticulo.setText(parkingList.get(position).getDescripcionarticulo()+" "+ parkingList.get(position).getGrupo());
            viewHolder.txtPrecio.setText(parkingList.get(position).getPrecioventa());
            viewHolder.txtBaseImponible.setText(parkingList.get(position).getBaseimponible() );


            return rowView;
        }
    }

创建此部分标题需要什么？

Answer 1

可以这样做的一种方法是使用带有标题和项目的布局，如果标题相同则更改可见性。

你可以参考这个例子。

布局：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <TextView
        android:id="@+id/section_header"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="start"
        android:padding="16dp"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:textColor="@color/primary"
        android:textStyle="bold"
        tools:text="This is section header" />

    <TextView
        android:id="@+id/list_item_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/section_header"
        android:background="?android:attr/selectableItemBackground"
        android:padding="16dp"
        android:textAppearance="?android:attr/textAppearanceMedium"
        tools:text="example text" />

    <!-- more views can go here -->

</RelativeLayout>

适配器：

public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.DataViewHolder> {

    private List<Contact> mData;

    @Inject
    public RecyclerAdapter() {
        mData = new ArrayList<>();
    }

    public void setData(List<Contact> data) {
        mData = data;
    }

    public Contact getItem(int position){
        return mData.get(position);
    }

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

    @Override
    public void onBindViewHolder(final DataViewHolder holder, int position) {
        Contact contact = mData.get(position);
        holder.headerTextView.setText(contact.getName().substring(0, 1));
        holder.nameTextView.setText(contact.getName());

        // if not first item check if item above has the same header
        if (position > 0 && mData.get(position - 1).getName().substring(0, 1).equals(contact.getName().substring(0, 1))) {
            holder.headerTextView.setVisibility(View.GONE);
        } else {
            holder.headerTextView.setVisibility(View.VISIBLE);
        }
    }

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

    public class DataViewHolder extends RecyclerView.ViewHolder {

        @BindView(R.id.section_header)
        TextView headerTextView;
        @BindView(R.id.list_item_name)
        TextView nameTextView;

        public DataViewHolder(View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);
        }
    }
}