android学习之RecyclerView的简单使用

用一个来自于《第一行代码》的简单例子说明：
Fruit.java

package com.example.luobo.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;    }}

FruitAdapter.java

package com.example.luobo.recyclerviewtest;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;public class FruitAdapter extends RecyclerView.Adapter<FruitAdapter.ViewHolder> {    private List<Fruit> mFruitList;    static class ViewHolder extends RecyclerView.ViewHolder{        ImageView fruitImage;        TextView fruitName;        View fruitView;        public ViewHolder(View view){            super(view);            fruitView = view;            fruitImage = (ImageView)view.findViewById(R.id.fruit_image);            fruitName = (TextView)view.findViewById(R.id.fruit_name);        }    }    public FruitAdapter(List<Fruit> fruitList){        mFruitList = fruitList;    }    @Override    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.fruit_item,parent,false);        final ViewHolder viewHolder = new ViewHolder(view);        viewHolder.fruitView.setOnClickListener(new View.OnClickListener(){            @Override            public void onClick(View view) {                int position = viewHolder.getAdapterPosition();                Fruit fruit = mFruitList.get(position);                Toast.makeText(view.getContext(),"You clicked view: "+fruit.getName(),Toast.LENGTH_SHORT).show();            }        });        viewHolder.fruitImage.setOnClickListener(new View.OnClickListener(){            @Override            public void onClick(View view) {                int position = viewHolder.getAdapterPosition();                Fruit fruit = mFruitList.get(position);                Toast.makeText(view.getContext(),"You clicked image: "+fruit.getName(),Toast.LENGTH_SHORT).show();            }        });        return viewHolder;    }    @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();    }}

RecyclerViewActivity.java

package com.example.luobo.recyclerviewtest;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;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;import java.util.Random;public class RecyclerViewActivity extends AppCompatActivity {    private String[] data = {"Apple","Banana","Orange","Watermelon","Pear","Grape","Pinapple",            "Strawberry","Cherry","Mango","Apple","Banana","Orange","Watermelon","Pear","Grape",            "Pinapple", "Strawberry","Cherry","Mango"};    private List<Fruit> fruitList = new ArrayList<>();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_recycler_view);        initFruits();        RecyclerView recyclerView = (RecyclerView)findViewById(R.id.recycler_view_test);//        LinearLayoutManager layoutManager = new LinearLayoutManager(this);//        layoutManager.setOrientation(LinearLayoutManager.VERTICAL);        StaggeredGridLayoutManager layoutManager = new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL);        recyclerView.setLayoutManager(layoutManager);        FruitAdapter adapter = new FruitAdapter(fruitList);        recyclerView.setAdapter(adapter);    }    public void initFruits(){        for (int i = 0;i<2;i++ )        {            for (int j = 0 ; j < data.length ; j++)            {                Fruit object = new Fruit(getRandomLengthName(data[j]),R.drawable.image2);                fruitList.add(object);            }        }    }    private String getRandomLengthName(String name){        Random random = new Random();        int length = random.nextInt(20)+1;        StringBuilder builder = new StringBuilder();        for (int i = 0;i < length;i++){            builder.append(name);        }        return builder.toString();    }}

activity_recyler.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.support.v7.widget.RecyclerView        android:layout_width="match_parent"        android:layout_height="match_parent"        android:id="@+id/recycler_view_test">    </android.support.v7.widget.RecyclerView></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="wrap_content"    android:layout_margin="5dp">    <ImageView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/fruit_image"        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"        android:layout_marginTop="10dp"/></LinearLayout>

在app文件夹下的build.grandle中的dependencies添加外部支持

compile 'com.android.support:recyclerview-v7:26.+'//最新版本就行