android - 从 RecyclerView 检索数据

Question

我RecyclerView在应用程序中使用自定义适配器。我想处理现有的菜单RecyclerView项。像普通变量一样访问它们，以便我可以在我的类适配器之外应用特定条件或在文本消息中发送它们等等。

如何访问RecyclerView项目？

代码类矩阵：

public class MainActivity extends AppCompatActivity {

    protected void onCreate(Bundle savedInstanceState) {
        setContentView(R.layout.activity_main);
        super.onCreate(savedInstanceState);

        addItem();

        Button button = findViewById(R.id.get_item);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                /*
                    I want when I press the button
                    The items are called
                 */
            }
        });

    }

    public void addItem() {

        List<Shops> shops = new ArrayList<>();
        String[] cloth = {"Silk", "Cotton", "Linen"};
        String[] wood = {"Sandal", "Jawi", "Pine"};
        String[] metal = {"Window", "door", "roof"};

        RecyclerView recyclerView = findViewById(R.id.list_shop);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));

        for (int i = 0; i < cloth.length; i++) {

            Shops shopsList = new Shops(cloth[i], wood[i], metal[i]);

            shops.add(shopsList);
        }

        ShopsAdapter adapter = new ShopsAdapter(shops);
        recyclerView.setAdapter(adapter);
    }
}

代码类列表

public class Shops {
    String cloth, wood, metal;

    public Shops(String cloth, String wood, String metal) {
        this.cloth = cloth;
        this.wood = wood;
        this.metal = metal;
    }
}

代码类适配器

public class ShopsAdapter extends RecyclerView.Adapter<ShopsAdapter.ShopsHolder> {

    private List<Shops> shopsList;

    public ShopsAdapter(List<Shops> shops) {
        this.shopsList = shops;
    }

    @Override
    public ShopsHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View row = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.template_recycler_view, viewGroup, false);
        ShopsHolder holder = new ShopsHolder(row);
        return holder;
    }

    @Override
    public void onBindViewHolder(ShopsHolder holder, int i) {

        Shops shops = shopsList.get(i);
        holder.cloth.setText(shops.cloth);
        holder.wood.setText(shops.wood);
        holder.metal.setText(shops.metal);

    }

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

    class ShopsHolder extends RecyclerView.ViewHolder {
        private TextView cloth, wood, metal;

        public ShopsHolder(View itemView) {
            super(itemView);
            cloth = itemView.findViewById(R.id.cloth);
            wood = itemView.findViewById(R.id.wood);
            metal = itemView.findViewById(R.id.metal);
        }
    }
}

如果您需要 XML 代码，我会在另一个回复中提供。

标签： androidandroid-recyclerviewgetadapter

Answer 1

像这样使用 getters() 和 setters () 创建模型/ POJO 类

public class Shops {

    private String cloth;
    private String wood;
    private String metal;

    public Shops(String cloth, String wood, String metal) {
        this.cloth = cloth;
        this.wood = wood;
        this.metal = metal;
    }

    public String getCloth() {
        return cloth;
    }

    public void setCloth(String cloth) {
        this.cloth = cloth;
    }

    public String getWood() {
        return wood;
    }

    public void setWood(String wood) {
        this.wood = wood;
    }

    public String getMetal() {
        return metal;
    }

    public void setMetal(String metal) {
        this.metal = metal;
    }
}

现在全局声明 ArrayList 并向其中添加项目。当您单击按钮时，使用索引号简单地访问它们。您可以为此运行一个 for 循环。

public class MainActivity extends AppCompatActivity {

private  List<Shops> shops;

protected void onCreate(Bundle savedInstanceState) {
    setContentView(R.layout.activity_main);
    super.onCreate(savedInstanceState);
    shops= new ArrayList<>();
    addItem();

    Button button = findViewById(R.id.get_item);
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            /*
                I want when I press the button
                The items are called
             */
            shops.get(1).getCloth();
            shops.get(1).getWood();
            shops.get(1).getMetal();

            // do whatever you want with them

        }
    });

}

public void addItem() {


    String[] cloth = {"Silk", "Cotton", "Linen"};
    String[] wood = {"Sandal", "Jawi", "Pine"};
    String[] metal = {"Window", "door", "roof"};

    RecyclerView recyclerView = findViewById(R.id.list_shop);
    recyclerView.setLayoutManager(new LinearLayoutManager(this));

    for (int i = 0; i < cloth.length; i++) {

        Shops shopsList = new Shops(cloth[i], wood[i], metal[i]);

        shops.add(shopsList);
    }