Android：RecylerView用法

0.Demo结构如下，开始之前应该添加支持库 compile 'com.android.support:recyclerview-v7:25.1.1'

Paste_Image.png

1.fruit_item.xml代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="5dp"
    >
    <ImageView
        android:id="@+id/fruit_image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        />
    <TextView
        android:id="@+id/fruit_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="left|center_vertical"
         />
</LinearLayout>

2.activity_mian.xml代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.zhao.customview.MainActivity">

<com.example.zhao.customview.TitleLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"/>

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

</LinearLayout>

3.实体类代码：

package com.example.zhao.customview;

//新建要在LIstView中显示的实体类
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;
    }
}

4.适配器类代码：

package com.example.zhao.customview;

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 zhao on 2017/2/15.
 */

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

    private List<Fruit> mFruitList;
    //新建静态ViewHolder类 继承于RecyclerView的ViewHolder
    static class ViewHolder extends RecyclerView.ViewHolder{

    private View view;
    ImageView fruitImage;
    TextView fruitName;

    public ViewHolder(View itemView) {
        super(itemView);
        view =itemView;
        fruitImage=(ImageView)itemView.findViewById(R.id.fruit_image);
        fruitName=(TextView)itemView.findViewById(R.id.fruit_name);
    }
}

    public FruitAdapter(List<Fruit> fruitList) {
        mFruitList=fruitList;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        //要返回一个ViewHolder
       View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.fruit_item,parent,false);
        final ViewHolder holder=new ViewHolder(view);

        //点击事件
        holder.view.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                int postion =holder.getAdapterPosition();
                Fruit fruit=mFruitList.get(postion);
                Toast.makeText(view.getContext(), "you clicked view " + fruit.getName(), Toast.LENGTH_SHORT).show();


            }
        });

        holder.view.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //得到实体类的方法
                int postion =holder.getAdapterPosition();
                Fruit fruit=mFruitList.get(postion);
                Toast.makeText(view.getContext(), "you clicked view " + fruit.getName(), Toast.LENGTH_SHORT).show();
            }
        });

        return holder;
    }

    @Override
    public void onBindViewHolder(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();
    }
}

5.主活动代码：

package com.example.zhao.customview;

import android.os.Bundle;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;

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

public class MainActivity extends AppCompatActivity {

    private List<Fruit> fruitList=new ArrayList<Fruit>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //应用前要隐藏原有的Title
        ActionBar actionBar=getSupportActionBar();
        if(actionBar!=null){
            actionBar.hide();
        }

        initFruits(); // 初始化水果数据
        RecyclerView 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 < 3; 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);
            Fruit orange = new Fruit("Orange", R.drawable.orange_pic);
            fruitList.add(orange);
            Fruit watermelon = new Fruit("Watermelon", R.drawable.watermelon_pic);
            fruitList.add(watermelon);
            Fruit pear = new Fruit("Pear", R.drawable.pear_pic);
            fruitList.add(pear);
            Fruit grape = new Fruit("Grape", R.drawable.grape_pic);
            fruitList.add(grape);
            Fruit pineapple = new Fruit("Pineapple", R.drawable.pineapple_pic);
            fruitList.add(pineapple);
            Fruit strawberry = new Fruit("Strawberry", R.drawable.strawberry_pic);
            fruitList.add(strawberry);
            Fruit cherry = new Fruit("Cherry", R.drawable.cherry_pic);
            fruitList.add(cherry);
            Fruit mango = new Fruit("Mango", R.drawable.mango_pic);
            fruitList.add(mango);
        }

    }
}