Android RecyclerView + ActiveAndroid

Question

使用 ActiveAndroid ORM 填充 RecyclerView 和跟踪数据更改的首选方法是什么？

我有 asked a question最近关于这个话题。但是它太冗长了，而且人们又很懒惰，几乎没有人会读到最后。

它的本质:有人有一个通过 ActiveAndroid 从数据库填充 RecyclerView 的工作示例吗？

Answer 1

我曾经使用过这个库，但使用的是 ListView。我认为这段代码应该与 RecyclerView 一起工作:

/* The database */
@Table(name = "Person")
public class Person extends Model {
    @Column(name = "Name")
    public String name;    
    @Column(name = "Age")
    public int age;
}


/* Your MainActivity */

List<Person> list = new ArrayList<>();
private RecyclerView rv;

/* Activity onCreate */
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity);

    list = getList(15);
    rv = (RecyclerView) findViewById(R.id.recycler_view);
    rv.setLayoutManager(new LinearLayoutManager(this));
    rv.setAdapter(new Adapter());

}

private List<Person> getList(int age){
    return new Select()
        .from(Person.class)
        .where("Age = ?", age)
        .orderBy(/* order you like */)
        .executeSingle();
}

private class Adapter extends RecyclerView.Adapter<Adapter.Holder> {

        @Override
        public Adapter onCreateViewHolder(ViewGroup parent, int viewType) {
            // you should inflate the layout you want be laid in every row of the recycler view. Im just inflating a text view for convinence
            return new Holder(LayoutInflater.from(parent.getContext()).inflate(android.R.layout.simple_list_item_1, parent, false));
        }

        @Override
        public void onBindViewHolder(Holder holder, int position) {
            // assign values to all view in the holder.
            holder.tv.setText(list.get(position).name);
        }

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

        public class Holder extends RecyclerView.ViewHolder {
            // here you load all the view in your layout
            TextView tv;

            public Holder(View itemView) {
                super(itemView);
                tv = (TextView) itemView;
            }
        }
    }

在这里，我假设您已经在数据库中创建并存储了值，因为问题只要求从数据库中填充。

我还没有测试过，但我认为它应该可以工作。