Android Studio --列表实现

• 设计列表布局：

定义了一个简单的列表界面，其中LinearLayoutCompat作为外层布局容器，RecyclerView用于显示可滚动的列表项。列表项的布局由right_list_item定义

<androidx.appcompat.widget.LinearLayoutCompat 
android:layout_width="match_parent" 
android:layout_height="match_parent">
<androidx.recyclerview.widget.RecyclerView 
android:id="@+id/rightlist" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager" 
tools:listitem="@layout/right_list_item"> 
</androidx.recyclerview.widget.RecyclerView>
</androidx.appcompat.widget.LinearLayoutCompat>

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="8dp"
    android:background="@drawable/edittext_background2"
    android:elevation="3dp">

    <com.google.android.material.imageview.ShapeableImageView
        android:id="@+id/pro_img"
        android:layout_width="130dp"
        android:layout_height="85dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginBottom="8dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:shapeAppearanceOverlay="@style/ShapeAppearanceOverlay.App.circleImageView"
        tools:scaleType="centerCrop"
        tools:srcCompat="@drawable/login" />

    <ImageView
        android:id="@+id/imageView3"
        android:layout_width="25dp"
        android:layout_height="25dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        app:layout_constraintEnd_toStartOf="@+id/pro_detail"
        app:layout_constraintTop_toTopOf="@+id/pro_img"
        app:srcCompat="@drawable/favorite" />

    <TextView
        android:id="@+id/pro_title"
        android:layout_width="wrap_content"
        android:layout_height="25dp"
        android:layout_marginStart="8dp"
        android:background="@drawable/light_green_background"
        android:gravity="center"
        android:paddingStart="8dp"
        android:paddingEnd="8dp"
        android:text="Aparment"
        android:textColor="@color/violet"
        android:textSize="12sp"
        android:textStyle="bold"
        app:layout_constraintStart_toEndOf="@+id/pro_img"
        app:layout_constraintTop_toTopOf="@+id/pro_img" />

    <TextView
        android:id="@+id/score"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:text="5"
        android:textSize="12sp"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="@+id/imageView4"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="@+id/pro_title" />

    <ImageView
        android:id="@+id/imageView4"
        android:layout_width="25dp"
        android:layout_height="25dp"
        android:layout_marginEnd="8dp"
        app:layout_constraintBottom_toBottomOf="@+id/pro_title"
        app:layout_constraintEnd_toStartOf="@+id/score"
        app:layout_constraintTop_toTopOf="@+id/pro_title"
        app:srcCompat="@drawable/star" />

    <TextView
        android:id="@+id/pro_detail"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:text="title"
        android:textColor="@color/violet"
        android:textSize="16sp"
        android:textStyle="bold"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="@+id/pro_title"
        app:layout_constraintTop_toBottomOf="@+id/pro_title" />

    <ImageView
        android:id="@+id/imageView5"
        android:layout_width="22dp"
        android:layout_height="22dp"
        android:layout_marginTop="8dp"
        app:layout_constraintStart_toStartOf="@+id/pro_detail"
        app:layout_constraintTop_toBottomOf="@+id/pro_detail"
        app:srcCompat="@drawable/location" />

    <TextView
        android:id="@+id/address"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:text="address"
        android:textSize="12sp"
        app:layout_constraintBottom_toBottomOf="@+id/imageView5"
        app:layout_constraintStart_toEndOf="@+id/imageView5"
        app:layout_constraintTop_toTopOf="@+id/imageView5" />

    <TextView
        android:id="@+id/pro_price"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:text="￥0"
        android:textColor="@color/violet"
        android:textSize="16sp"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="@+id/textView10"
        app:layout_constraintEnd_toStartOf="@+id/textView10"
        app:layout_constraintTop_toTopOf="@+id/textView10" />

    <TextView
        android:id="@+id/textView10"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:text="/Month"
        android:textSize="12sp"
        app:layout_constraintBottom_toBottomOf="@+id/address"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="@+id/address"
        app:layout_constraintVertical_bias="0.0" />
    <View
        android:layout_width="match_parent"
        android:layout_height="10dp"/>
</androidx.constraintlayout.widget.ConstraintLayout>

创建Adapter类：

在java/你的包名/你的应用名/下创建一个新的Java类，通常命名为MyAdapter.java。

这个类继承自RecyclerView.Adapter，并定义了数据的持有方式和视图的绑定逻辑。

 以下代码定义了一个名为RightListAdapter的RecyclerView.Adapter，用于在一个RecyclerView组件中显示产品信息列表

public class RightListAdapter extends RecyclerView.Adapter<RightListAdapter.MyHolder> {

    private List<ProductInfo> mProductInfo = new ArrayList<>();
    private RightListOnClickItemListener mRightListOnClickItemListener;

    public void setListData(List<ProductInfo> list) {
        this.mProductInfo = list;
        //刷新
        notifyDataSetChanged();
    }

    @NonNull
    @Override
    public MyHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.right_list_item, null);
        return new MyHolder(view);

    }

    @Override
    public void onBindViewHolder(@NonNull MyHolder holder,int position) {
        //绑定数据
        ProductInfo productInfo = mProductInfo.get(position);
        holder.pro_img.setImageResource(productInfo.getImg());
        holder.pro_title.setText(productInfo.getTitle());
        holder.address.setText(productInfo.getAddress());
        holder.type.setText(productInfo.getType());
        holder.pro_price.setText("￥" + productInfo.getPrice());  //int+String 变成文本类型

        //点击事件
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(null!=mRightListOnClickItemListener){
                    mRightListOnClickItemListener.onItemClick(productInfo,position);
                }
            }
        });

    }

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

    static class MyHolder extends RecyclerView.ViewHolder {
        ImageView pro_img;
        TextView pro_title;
        TextView pro_detail;
        TextView address;
        TextView pro_price;
        TextView type;


        public MyHolder(@NonNull View itemView) {
            super(itemView);
            pro_img = itemView.findViewById(R.id.pro_img);
            pro_title = itemView.findViewById(R.id.pro_detail);
            address = itemView.findViewById(R.id.address);
            pro_price = itemView.findViewById(R.id.pro_price);
            type= itemView.findViewById(R.id.pro_title);

        }
    }



    public RightListOnClickItemListener getmRightListOnClickItemListener() {
        return mRightListOnClickItemListener;
    }

    public void setmRightListOnClickItemListener(RightListOnClickItemListener mRightListOnClickItemListener) {
        this.mRightListOnClickItemListener = mRightListOnClickItemListener;
    }

    public interface RightListOnClickItemListener {
        void onItemClick(ProductInfo productInfo,int position);
    }
}

综上，关于列表创建主要就是布局文件和对应适配器的代码编写。上述的代码是用于显示产品信息列表的RecyclerView列表项布局和Adapter类的实现示例，包括如何设置布局、绑定数据、处理点击事件以及更新数据源等关键逻辑。