RecyclerView的用法

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使用RecyclerView

1、在app/build.gradle(Module:app)文件的dependencies闭包添加依赖

compile 'com.android.support:recyclerview-v7:25.1.0'

2、编写适配器类xxxAdapter，继承自RecyclerView.Adapter，并制定泛型为 xxxAdapter.ViewHolder，这个ViewHolder是在该Adapter中定义的一个内部类。示例代码如下：

package com.songzheng.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;/** * Created by make on 2017/2/5. *///RecyclerView 适配器，继承自RecyclerView.Adapterpublic class FruitAdapter extends RecyclerView.Adapter<FruitAdapter.ViewHolder> {    private List<Fruit> mFruitList;    //创建ViewHolder，继承自RecyclerView.ViewHolder    static class ViewHolder extends RecyclerView.ViewHolder{        ImageView fruitImage;        TextView fruitName;        View fruitView; //设置View最外层点击事件所需        public ViewHolder(View itemView) {            super(itemView);            fruitImage = (ImageView) itemView.findViewById(R.id.fruit_image);            fruitName = (TextView) itemView.findViewById(R.id.fruit_name);            fruitView = itemView;        }    }    public FruitAdapter(List<Fruit> fruitList){        mFruitList = fruitList;    }    //加载item，实例化ViewHolder，设置点击监听事件    @Override    public FruitAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.fruit_item, parent, false);        final ViewHolder holder = new ViewHolder(view);        //设置点击事件        holder.fruitView.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                int position = holder.getAdapterPosition();//获取点击控件的位置                Fruit fruit = mFruitList.get(position);                Toast.makeText(view.getContext(), "you clicked 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(), "You clicked image " + fruit.getName(), Toast.LENGTH_SHORT).show();            }        });        return holder;    }    //设置控件内容    @Override    public void onBindViewHolder(FruitAdapter.ViewHolder holder, int position) {        Fruit fruit = mFruitList.get(position);        holder.fruitName.setText(fruit.getName());        holder.fruitImage.setImageResource(fruit.getImageId());    }    @Override    public int getItemCount() {        return mFruitList.size();    }}

3、在MainActivity中为RecyclerView指定布局形式（使用LayoutManager）和适配器。

其中指定布局形式可以使用LinearLayoutManager（实现ListView类似的效果，但RecyclerView不仅可以纵向排列，还可以横向排列）或者GridLayoutManager（网格布局）或者StaggeredGridLayoutManager（瀑布流布局）。

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 = (RecyclerView) findViewById(R.id.recycler_view);//      LinearLayoutManager layoutManager = new LinearLayoutManager(this);      //线性布局//      layoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);           //设置布局方向为横向        StaggeredGridLayoutManager layoutManager = new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL);      //瀑布流        recyclerView.setLayoutManager(layoutManager);        FruitAdapter adapter = new FruitAdapter(fruitList);        recyclerView.setAdapter(adapter);    }}

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