用Android实现代码使用TabLayout和ViewPager2实现如下图所示界面效果。其中导航标签至少有3个，推荐页显示商品列表，每个商品包括图片、商品名称、介绍、价格；其他页面不做详细要求，自行模拟实现即可。

好的，这是一个常见的Android开发问题，需要使用TabLayout和ViewPager2来实现多个页面的导航和切换。以下是实现步骤的大致流程：

1. 创建一个新的Android项目，并在布局文件中添加TabLayout和ViewPager2控件。

2. 在MainActivity中，创建一个FragmentPagerAdapter类来管理ViewPager2中的不同页面。

3. 在FragmentPagerAdapter类中，创建多个Fragment类来显示不同的页面内容。

4. 在每个Fragment中，使用RecyclerView来显示商品列表，并在RecyclerView的Adapter中设置商品列表项的布局和内容。

5. 在MainActivity中，将TabLayout和ViewPager2绑定在一起，并将FragmentPagerAdapter中的Fragment添加到ViewPager2中。

6. 运行应用程序，查看效果。

以下是一个示例代码，供您参考：

MainActivity.java

import android.os.Bundle;

import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentPagerAdapter;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import androidx.viewpager2.adapter.FragmentStateAdapter;
import androidx.viewpager2.widget.ViewPager2;

import com.google.android.material.tabs.TabLayout;

public class MainActivity extends AppCompatActivity {

    private TabLayout tabLayout;
    private ViewPager2 viewPager;

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

        tabLayout = findViewById(R.id.tab_layout);
        viewPager = findViewById(R.id.view_pager);

        // 添加页面
        viewPager.setAdapter(new MyPagerAdapter(this));

        // 将TabLayout和ViewPager2绑定在一起
        tabLayout.setupWithViewPager(viewPager);
    }

    private static class MyPagerAdapter extends FragmentStateAdapter {

        public MyPagerAdapter(MainActivity activity) {
            super(activity);
        }

        @Override
        public Fragment createFragment(int position) {
            switch (position) {
                case 0:
                    return new RecommendFragment();
                case 1:
                    return new CategoryFragment();
                case 2:
                    return new CartFragment();
                default:
                    return new Fragment();
            }
        }

        @Override
        public int getItemCount() {
            return 3;
        }
    }
}

RecommendFragment.java

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import java.util.ArrayList;
import java.util.List;

public class RecommendFragment extends Fragment {

private RecyclerView recyclerView;

private List<Goods> goodsList = new ArrayList<>();

@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_recommend, container, false);

// 初始化商品列表数据
initGoods();

// 初始化RecyclerView
recyclerView = view.findViewById(R.id.recycler_view);
LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
recyclerView.setLayoutManager(layoutManager);
GoodsAdapter adapter = new GoodsAdapter(goodsList);
recyclerView.setAdapter(adapter);

return view;
}

private void initGoods() {
for (int i = 0; i < 20; i++) {
Goods goods = new Goods();
goods.setImage(R.drawable.ic_launcher_foreground);
goods.setName("商品" + i);
goods.setDesc("这是一件很好的商品！");
goods.setPrice(100.00);
goodsList.add(goods);
}
}
}

fragment_recommend.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">

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

</RelativeLayout>

Goods.java

public class Goods {

private int image;
private String name;
private String desc;
private double price;

public int getImage() {
return image;
}

public void setImage(int image) {
this.image = image;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getDesc() {
return desc;
}

public void setDesc(String desc) {
this.desc = desc;
}

public double getPrice() {
return price;
}

public void setPrice(double price) {
this.price = price;
}
}

GoodsAdapter.java

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import java.util.List;

public class GoodsAdapter extends RecyclerView.Adapter<GoodsAdapter.ViewHolder> {

private List<Goods> goodsList;

static class ViewHolder extends RecyclerView.ViewHolder {

ImageView imageView;
TextView nameText;
TextView descText;
TextView priceText;

public ViewHolder(View view) {
super(view);
imageView = view.findViewById(R.id.image_view);
nameText = view.findViewById(R.id.name_text);
descText = view.findViewById(R.id.desc_text);
priceText = view.findViewById(R.id.price_text);
}
}

public GoodsAdapter(List<Goods> goodsList) {
this.goodsList = goodsList;
}

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

@Override
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
Goods goods = goodsList.get(position);
holder.imageView.setImageResource(goods.getImage());
holder.nameText.setText(goods.getName());
holder.descText.setText(goods.getDesc());
holder.priceText.setText("￥" + String.format("%.2f", goods.getPrice()));
}

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

goods_item.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="16dp">

<ImageView
android:id="@+id/image_view"
android:layout_width="80dp"
android:layout_height="80dp" />

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_marginLeft="16dp">

<TextView
android:id="@+id/name_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="18sp"
android:text="商品名称" />

<TextView
android:id="@+id/desc_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="14sp"
android:text="商品介绍" />

<TextView
android:id="@+id/price_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="16sp"
android:text="商品价格" />

</LinearLayout>

</LinearLayout>

以上是一个简单的示例，您可以根据自己的需求和设计来修改和扩展。