RecycleView布局中接口的使用

步骤：1.在adapter中新建一个接口，接口在adapter中有一个实例，并且提供set方法
      2.在createViewHolder的时候给itemview设置点击事件this(Adapter实现了View.OnClickListener 接口).
      3.在onBindViewHolder的时候给itemview设置tag,目的是让itemview带着自己的位置，被复用后会设置新的。
      4.重写Adapter的OnClickListener方法。
          if (ItemclickListener != null) {
            ItemclickListener.onitemclick(Integer.parseInt(view.getTag().toString()));
        }
      5.在Activity中去使用。给adapter.setItemclickListener(匿名内部类的方式)。
                             也可以Activity实现OnItemClick接口，重写onitemclick方法。

RecycleViewAdapter.java

package com.example.adapter;

import android.content.Context;
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 com.example.entity.CarCompany;
import com.example.jump.R;

import java.util.List;

/**
 * Created by Administrator on 2017/2/20.
 */

public class RecycleViewAdapter extends RecyclerView.Adapter<RecycleViewAdapter.MyHolder> implements View.OnClickListener{
    private  Context mContext;
    private List<CarCompany> list;
    private LayoutInflater inflater;
    private OnItemClick ItemclickListener=null;//给一个实例并且提供下边set方法
    public void setItemClickListener(OnItemClick itemclicklistener){
        ItemclickListener=itemclicklistener;
    }
    //有参的构造函数，并实例化布局加载器
    public RecycleViewAdapter(Context mContext, List<CarCompany> list) {
        this.mContext = mContext;
        this.list = list;
        inflater=LayoutInflater.from(mContext);
    }

    @Override
    public MyHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        //第二个参数是容器 第三个参数：true使用父布局的布局参数，false使用自己的布局参数
        View view=inflater.inflate(R.layout.activity_item_list,parent,false);
        MyHolder holder=new MyHolder(view);
        holder.itemView.setOnClickListener(this);
        return new MyHolder(view);
    }

    @Override
    public void onBindViewHolder(MyHolder holder, int position) {
        //获取对应位置的数据, 不能再此重新实例化CarCompany
        CarCompany company=list.get(position);
        holder.tv_name.setText(company.getCompany());
        holder.iv_img.setImageResource(company.getImg());
        holder.itemView.setTag(position);
    }

    @Override
    public int getItemCount() {
        return list.size();
    }

    /**
     *
     * @param v
     */
    @Override
    public void onClick(View v) {
        if(ItemclickListener!=null){
            ItemclickListener.onitemclick(Integer.parseInt(v.getTag().toString()));
        }
    }

    //创建内部类继承于RecycleView.ViewHolder实例化自定义布局中的属性
    class MyHolder extends RecyclerView.ViewHolder{//内部类要写在主函数里边
        private ImageView iv_img;
        private TextView tv_name;
        public MyHolder(View itemView) {
            super(itemView);
            iv_img= (ImageView) itemView.findViewById(R.id.iv_img);
            tv_name= (TextView) itemView.findViewById(R.id.name);
        }
    }
    //有方法 我们需要知道点击的是第几个item.
//    自定义接口,同时传入position参数设置item布局点击的是哪一个item
    public interface OnItemClick{
        void onitemclick(int position);
    }

}

RecycleViewAcvitity.java

package com.example.jump;

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

import com.example.adapter.RecycleViewAdapter;
import com.example.entity.CarCompany;

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

public class RecycleViewActivity extends AppCompatActivity {
    private RecyclerView rv;
    private String[] names = new String[]{"长安", "沃尔沃", "大众", "宾利", "奔驰"};
    private int[] ids = new int[]{R.drawable.changan, R.drawable.vol, R.drawable.das, R.drawable.bl, R.drawable.benz};
    private List<CarCompany> list;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_recycle_view);
        rv= (RecyclerView) findViewById(R.id.rv_view);//一定要实例化对应layout中设置的RecycleView
        intiRV();
    }
    private void intiRV(){
        list=new ArrayList<>();
        for (int i = 0; i <names.length ; i++) {
            CarCompany company=new CarCompany();
            company.setCompany(names[i]);
            company.setImg(ids[i]);
            list.add(company);
        }
        RecycleViewAdapter adapter=new RecycleViewAdapter(this,list);
        //设置布局管理器
        rv.setLayoutManager(new LinearLayoutManager(this));//像ListView一样展示
        rv.setAdapter(adapter);
    }
}

recycleview.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_recycle_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.jump.RecycleViewActivity">
    <android.support.v7.widget.RecyclerView
        android:id="@+id/rv_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
    </android.support.v7.widget.RecyclerView>

</RelativeLayout>

标签：RecycleView,布局,list,private,接口,import,android,public,view
来源： https://blog.51cto.com/u_15249199/2847148