Android 筆記 - RecyclerView (取代 ListView)

 當有條列式的多行要顯示時可用，要顯示成網格也行

首先要定義 Adapter

內容大致如下

class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
    public class ViewHolder extends RecyclerView.ViewHolder {
        TextView tv;
        public ViewHolder(@NonNull View itemView) { // 在這裡find其他物件
            super(itemView);
            tv = itemView.findViewById(R.id.tv);
        }
    }

    private String[] name = { "111", "222", "333" };
    MyAdapter(Context context) {
    }
    
    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.你的內容xml, parent, false);
        return new ViewHolder(view);
    }
    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) { // 在這裡變更物件值
        holder.tv.setText(name[position]);
    }

    @Override
    public int getItemCount() {
        return name.length;
    }
}


主要的 RecycleView 部份

listAdapter = new MultiLedgerAdapter();
rv_list = activity.findViewById(R.id.rv_list);
rv_list.setLayoutManager(new LinearLayoutManager(context));
rv_list.setAdapter(listAdapter);

要注意的是，除了 setAdapter 之外，還要指定 setLayoutManager ，不然會顯示不出來哦~


設定佈局 setLayoutManager 選擇
有三種可選擇

1. LinearLayoutManager - 線性佈局管理器
2. StaggeredGridLayoutManager - 錯列網格佈局管理器
3. GridLayoutManager - 網格佈局管理器

LinearLayoutManager 語法及效果圖

rv_list.setLayoutManager(new LinearLayoutManager (context));
或
rv_list.setLayoutManager(new LinearLayoutManager (context, LinearLayoutManager.VERTICAL, false));

rv_list.setLayoutManager(new LinearLayoutManager (context, LinearLayoutManager.VERTICAL, true));

rv_list.setLayoutManager(new LinearLayoutManager (context, LinearLayoutManager.HORIZONTAL, false));

rv_list.setLayoutManager(new LinearLayoutManager (context, LinearLayoutManager.HORIZONTAL, true));

StaggeredGridLayoutManager 語法及效果圖

rv_list.setLayoutManager(new StaggeredGridLayoutManager(3, LinearLayoutManager.VERTICAL));

rv_list.setLayoutManager(new StaggeredGridLayoutManager(3, LinearLayoutManager.HORIZONTAL));

GridLayoutManager 語法及效果圖

rv_list.setLayoutManager(new GridLayoutManager(context, 3, LinearLayoutManager.VERTICAL, false));

rv_list.setLayoutManager(new GridLayoutManager(context, 3, LinearLayoutManager.VERTICAL, true));

rv_list.setLayoutManager(new GridLayoutManager(context, 3, LinearLayoutManager.HORIZONTAL, false));

rv_list.setLayoutManager(new GridLayoutManager(context, 3, LinearLayoutManager.HORIZONTAL, true));