android列表动态数据

在Android中，可以使用RecyclerView或ListView来实现动态数据列表。以下是实现动态数据列表的一些步骤：

1. 创建数据模型类：创建一个类来表示列表项的数据，例如：

public class Item {
    private String title;
    private String description;

    public Item(String title, String description) {
        this.title = title;
        this.description = description;
    }

    public String getTitle() {
        return title;
    }

    public String getDescription() {
        return description;
    }
}

2. 创建适配器类：创建一个适配器类来将数据模型类与列表项视图绑定在一起，例如：

RecyclerView适配器：

public class ItemAdapter extends RecyclerView.Adapter<ItemAdapter.ViewHolder> {
    private List<Item> itemList;

    public ItemAdapter(List<Item> itemList) {
        this.itemList = itemList;
    }

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

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        Item item = itemList.get(position);
        holder.titleTextView.setText(item.getTitle());
        holder.descriptionTextView.setText(item.getDescription());
    }

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

    public static class ViewHolder extends RecyclerView.ViewHolder {
        public TextView titleTextView;
        public TextView descriptionTextView;

        public ViewHolder(View itemView) {
            super(itemView);
            titleTextView = itemView.findViewById(R.id.titleTextView);
            descriptionTextView = itemView.findViewById(R.id.descriptionTextView);
        }
    }
}

ListView适配器：

public class ItemAdapter extends ArrayAdapter<Item> {
    private LayoutInflater inflater;

    public ItemAdapter(Context context, List<Item> itemList) {
        super(context, 0, itemList);
        inflater = LayoutInflater.from(context);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView == null) {
            convertView = inflater.inflate(R.layout.item_layout, parent, false);
            holder = new ViewHolder();
            holder.titleTextView = convertView.findViewById(R.id.titleTextView);
            holder.descriptionTextView = convertView.findViewById(R.id.descriptionTextView);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        Item item = getItem(position);
        holder.titleTextView.setText(item.getTitle());
        holder.descriptionTextView.setText(item.getDescription());

        return convertView;
    }

    private static class ViewHolder {
        public TextView titleTextView;
        public TextView descriptionTextView;
    }
}

3. 在布局文件中添加RecyclerView或ListView：在XML布局文件中添加RecyclerView或ListView，例如：

RecyclerView布局文件：

<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/recyclerView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

ListView布局文件：

<ListView
    android:id="@+id/listView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

4. 在代码中设置适配器：在Activity或Fragment中，使用适配器来显示数据列表，例如：

RecyclerView：

List<Item> itemList = new ArrayList<>();
itemList.add(new Item("Item 1", "Description 1"));
itemList.add(new Item("Item 2", "Description 2"));

RecyclerView recyclerView = findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setAdapter(new ItemAdapter(itemList));

ListView：

List<Item> itemList = new ArrayList<>();
itemList.add(new Item("Item 1", "Description 1"));
itemList.add(new Item("Item 2", "Description 2"));

ListView listView = findViewById(R.id.listView);
listView.setAdapter(new ItemAdapter(this, itemList));