RecyclerView使用

添加依赖

implementation 'com.android.support:recyclerview-v7:27.1.1'
implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.github.bumptech.glide:glide:4.7.1'

如果需要加载网络图片则需要添加Glide的模块依赖

在xml文件中添加RecyclerView的控件

<android.support.v7.widget.RecyclerView
        android:id="@+id/recycler_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
  </android.support.v7.widget.RecyclerView>

也可以直接添加控件

添加RecyclerView

新建一个item的布局文件，绘制需要显示的item样式

item布局

新建一个Item类用于设置列表条目要显示的内容

/**
 * 定义一个Item类用于保存每个条目的详细信息
 */
public class Item {
    private String imgUrl;
    private String title;
    private String name;
    private int favorites;
    private int comments;
    public Item(String imgUrl,String title,String name,int favorites,int comments){
        this.imgUrl = imgUrl;
        this.title = title;
        this.name = name;
        this.favorites = favorites;
        this.comments =comments;
    }

    public String getImgUrl() {
        return imgUrl;
    }

    public String getTitle() {
        return title;
    }

    public String getName() {
        return name;
    }

    public int getFavorites() {
        return favorites;
    }

    public int getComments() {
        return comments;
    }
}

接下来新建一个ItemFactory工厂类用于制造每个item

/**
 * 定义一个ItemFactory用于制造Item 对象
 */
public class ItemFactory {
    private static String[] imgUrls = {
            //填入要显示的网络图片地址
    };

    private static String[] titles = {
            //填入要显示的标题
    };

    private static String[] names = {
            //填入要显示的姓名
    };

    public static List<Item> createItem(int num){
        Random random = new Random();
        List<Item> items = new ArrayList<>();
        int arrySize = imgUrls.length;
        for (int i=0;i < num;i++){
            int a = i%arrySize;
            String url = imgUrls[a];
            String title = titles[a];
            String name = names[a];
            int favorites = random.nextInt(10000);
            int comments = random.nextInt(10000);
            items.add(new Item(url,title,name,favorites,comments));
        }
        return items;
    }
}

接下来是最重要的添加适配器的过程

/**
 * 适配器继承自RecyclerView.Adapter，<>里面是泛型MyHolder
 */
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.MyHolder>{//需要复写三个方法
    Context context;
    private List<Item> list;

    public RecyclerAdapter(Context context,List<Item> list){//传入一个显示列表，控制显示的条目数量
        this.list = list;
        this.context = context;
    }

    @NonNull
    @Override
    public MyHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        //填充一个布局到ViewHolder里面
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item,parent,false);
        MyHolder myHolder = new MyHolder(view);
        return myHolder;
    }

    @Override
    public void onBindViewHolder(@NonNull MyHolder holder, int position) {
        Item item = list.get(position);
        //利用Glide加载网络图片
        Glide.with(context).load(item.getImgUrl()).into(holder.imageView);
        holder.title.setText(item.getTitle());
        holder.name.setText(item.getName());
        holder.favorites.setText(String.valueOf(item.getFavorites()));
        holder.comments.setText(String.valueOf(item.getComments()));
    }

    @Override
    public int getItemCount() {
        //返回条目的数量
        return list.size();
    }

    /**
     * 自定义MyHolder继承自ViewHolder，用于控制每个item的元素,可以为单独的某个控件设置值
     */
    class MyHolder extends RecyclerView.ViewHolder{
        RelativeLayout itemLayout;
        ImageView imageView;
        TextView title;
        TextView name;
        TextView favorites;
        TextView comments;
        MyHolder(View itemView) {
            super(itemView);
            itemLayout = itemView.findViewById(R.id.item_layout);
            imageView = itemView.findViewById(R.id.iv_item);
            title = itemView.findViewById(R.id.text_item);
            name = itemView.findViewById(R.id.tv_name);
            favorites = itemView.findViewById(R.id.tv_favorite);
            comments = itemView.findViewById(R.id.tv_comment);
        }
    }
}

最后一步是在Activity文件中实例化RecyclerView和它的适配器

public class MainActivity extends AppCompatActivity {

    private RecyclerView mRecyclerView;
    private RecyclerAdapter adapter;
    List<Item> list = ItemFactory.createItem(100);

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mRecyclerView = findViewById(R.id.recycler_view);
        adapter = new RecyclerAdapter(this,list);
        //设置LayoutManager
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false));
        //设置动画效果
        mRecyclerView.setItemAnimator(new DefaultItemAnimator());
        //设置适配器
        mRecyclerView.setAdapter(adapter);
        //添加默认的分割线
        mRecyclerView.addItemDecoration(new DividerItemDecoration(this,DividerItemDecoration.VERTICAL));
    }
}

原贴：
https://www.jianshu.com/p/4782824d9307?utm_campaign=maleskine&utm_content=note&utm_medium=seo_notes&utm_source=recommendation
效果图见原贴