RecyclerView的横向布局及点击事件（也可做瀑布流效果）

 

1.在build.gradle中加入依赖

dependencies {    ……    compile 'com.android.support:recyclerview-v7:26.0.0-alpha1'}

2.activity_main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent">    <android.support.v7.widget.RecyclerView        android:id="@+id/recycler_view"        android:layout_width="match_parent"        android:layout_height="match_parent" /></LinearLayout>

fruit_item.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:gravity="center">    <ImageView        android:id="@+id/fruit_image"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center_horizontal"        android:src="@drawable/apple"/>    <TextView        android:id="@+id/fruit_name"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center_horizontal"        android:layout_marginTop="10dp"        android:text="apple"/></LinearLayout>

3.java代码

package com.cwj.recyclerview;/** * Created by 17551_000 on 2017/9/21. */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;    }}

package com.cwj.recyclerview;import android.support.v7.widget.RecyclerView;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 java.util.List;/** * Created by 17551_000 on 2017/9/21. */public class FruitAdapter extends RecyclerView.Adapter<FruitAdapter.ViewHolder> {    private List<Fruit> mFruitList;    static class ViewHolder extends RecyclerView.ViewHolder {        View fruitView;        ImageView fruitImage;        TextView fruitName;        //定义一个内部类ViewHolder        public ViewHolder(View view) {            super(view);            fruitView = view;            fruitImage = view.findViewById(R.id.fruit_image);            fruitName = view.findViewById(R.id.fruit_name);        }    }    public FruitAdapter(List<Fruit> fruitList){        mFruitList = fruitList;    }    /**     * 用于创建ViewHolder实例     * @param parent     * @param viewType     * @return     */    @Override    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.fruit_item,parent,false);        //RecyclerView的点击事件        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(), 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(), fruit.getName(), Toast.LENGTH_SHORT).show();            }        });        return holder;    }    /**     * 用于对RecyclerView子项的数据进行赋值     * @param holder     * @param position     */    @Override    public void onBindViewHolder(ViewHolder holder, int position) {        Fruit fruit = mFruitList.get(position);        holder.fruitImage.setImageResource(fruit.getImageId());        holder.fruitName.setText(fruit.getName());    }    /**     * 告诉RecyclerView一共有多少子项，并返回数据源的长度     * @return     */    @Override    public int getItemCount() {        return mFruitList.size();    }}

package com.cwj.recyclerview;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.support.v7.widget.StaggeredGridLayoutManager;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);        //初始化水果数据        initFruits();        //获取RecyclerView对象的实例        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);        //LinearLayoutManager layoutManager = new LinearLayoutManager(this);        //创建一个StaggeredGridLayoutManager实例        StaggeredGridLayoutManager layoutManager = new StaggeredGridLayoutManager(1,StaggeredGridLayoutManager.VERTICAL);        //RecyclerView的横向布局        layoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);        recyclerView.setLayoutManager(layoutManager);        FruitAdapter adapter = new FruitAdapter(fruitList);        recyclerView.setAdapter(adapter);    }    private void initFruits() {        for (int i = 0;i < 2; i++){            Fruit apple = new Fruit("苹果",R.drawable.apple);            fruitList.add(apple);            Fruit banana = new Fruit("香蕉",R.drawable.banana);            fruitList.add(banana);            Fruit orange = new Fruit("橘子",R.drawable.orange);            fruitList.add(orange);            Fruit Watermelon = new Fruit("西瓜",R.drawable.watermelon);            fruitList.add(Watermelon);            Fruit pear = new Fruit("梨",R.drawable.pear);            fruitList.add(pear);            Fruit Grape = new Fruit("葡萄",R.drawable.grape);            fruitList.add(Grape);            Fruit Pineapple = new Fruit("菠萝",R.drawable.pineapple);            fruitList.add(Pineapple);            Fruit strawberry = new Fruit("草莓",R.drawable.strawberry);            fruitList.add(strawberry);            Fruit cherry = new Fruit("樱桃",R.drawable.cherry);            fruitList.add(cherry);            Fruit mango = new Fruit("芒果",R.drawable.mango);            fruitList.add(mango);        }    }}