androidx.recyclerview:recyclerview的使用

添加扩展

或手动修改app/build.gradle：
在dependencies里添加

implementation 'androidx.recyclerview:recyclerview:1.0.0' 

新建布局layout

item布局fruit_item.xml：

 
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content"> <ImageView android:id="@+id/fruit_image" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <TextView android:id="@+id/fruit_name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_vertical" android:layout_marginLeft="10dp"/>  
     LinearLayout> 

修改活动布局activity_main.xml：

 
    <LinearLayout 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"/>  
     LinearLayout> 

item数据类

package com.example.recyclerviewtest; public class Fruit { 
    private String name; private int imageId; public Fruit(String name, int imageId) { 
    this.name = name; this.imageId = imageId; } public String getName() { 
    return name; } public int getImageId() { 
    return imageId; } } 

适配器类FruitAdapter

package com.example.recyclerviewtest; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; import androidx.annotation.NonNull; import androidx.recyclerview.widget.RecyclerView; import java.util.List; public class FruitAdapter extends RecyclerView.Adapter<FruitAdapter.ViewHolder> { 
    private List<Fruit> mFruitList; static class ViewHolder extends RecyclerView.ViewHolder { 
    View fruitView; ImageView fruitImage; TextView fruitName; public ViewHolder(View view) { 
    super(view); fruitView = view; fruitImage = view.findViewById(R.id.fruit_image); fruitName = view.findViewById(R.id.fruit_name); } } @NonNull @Override public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { 
    View view = LayoutInflater.from(parent.getContext()) .inflate(R.layout.fruit_item, parent, false); final ViewHolder holder = new ViewHolder(view); holder.fruitView.setOnClickListener(new View.OnClickListener() { 
    @Override public void onClick(View view) { 
    int position = holder.getAdapterPosition(); Fruit fruit = mFruitList.get(position); Toast.makeText(view.getContext(), "你点击了View"+ fruit.getName(), Toast.LENGTH_SHORT).show(); } }); holder.fruitImage.setOnClickListener(new View.OnClickListener() { 
    @Override public void onClick(View view) { 
    int position = holder.getAdapterPosition(); Fruit fruit = mFruitList.get(position); Toast.makeText(view.getContext(), "你点击了图片"+ fruit.getName(), Toast.LENGTH_SHORT).show(); } }); return holder; } @Override public void onBindViewHolder(@NonNull ViewHolder holder, int position) { 
    Fruit fruit = mFruitList.get(position); holder.fruitImage.setImageResource(fruit.getImageId()); holder.fruitName.setText(fruit.getName()); } @Override public int getItemCount() { 
    return mFruitList.size(); } public FruitAdapter(List<Fruit> fruitList) { 
    mFruitList = fruitList; } } 

主活动类

package com.example.recyclerviewtest; import androidx.appcompat.app.AppCompatActivity; import androidx.recyclerview.widget.LinearLayoutManager; import androidx.recyclerview.widget.RecyclerView; import android.os.Bundle; import java.util.ArrayList; import java.util.List; public class MainActivity extends AppCompatActivity { 
    private List<Fruit> fruitList = new ArrayList<>(); @Override protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initFruits(); RecyclerView recyclerView = findViewById(R.id.recycler_view); LinearLayoutManager layoutManager= new LinearLayoutManager(this); recyclerView.setLayoutManager(layoutManager); FruitAdapter adapter = new FruitAdapter(fruitList); recyclerView.setAdapter(adapter); } private void initFruits() { 
    for(int i = 0; i < 10; i++) { 
    Fruit apple = new Fruit("Apple", R.drawable.apple_pic); fruitList.add(apple); Fruit banana = new Fruit("banana", R.drawable.banana_pic); fruitList.add(banana); } } }