安卓中RecyclerView的简单使用和自定义RecyclerView的接口点击监听事件

初学者RecyclerView的难点和重点在适配器Adapter里,刚开始有点难理解
1.先创建RecyclerView的item的xml文件
2.创建点击事件接口
4.创建ViewHolder类
3.自定义适配器 适配器里实现接口

使用RecyclerView先在build.gradle里添加依赖,如下:
compile ‘com.android.support:recyclerview-v7:26.0.+’

注意:RecyclerView依赖的版本要与自己安卓stuidio系统的
compile ‘com.android.support:appcompat-v7:26.+’的版本一样

首先xml文件里：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="ydtx.bwie.com.recyclerviewtext.MainActivity">

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


</RelativeLayout>

item布局：

<?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">

    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</LinearLayout>

点击事件接口：

import android.view.View;

/**
 * Created by 王 on 2017/10/11.
 */

public interface OnClickRecyclerListner {
    //点击的接口
    void onItemclick(View view,int position);
    //长按的接口
    void onLongItemclick(View view,int position);
}

ViewHolder：

import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.textservice.TextInfo;
import android.widget.TextView;

import org.w3c.dom.Text;

/**
 * Created by 王 on 2017/10/11.
 */

public class MyViewHolder extends RecyclerView.ViewHolder {
    public TextView tv;

    //构造方法 待会适配器里创建时传进来view 就去找id 其实和Listview的Viewholder的优化是一样的道理
    public MyViewHolder(View itemView) {
        super(itemView);
        tv = itemView.findViewById(R.id.tv);
    }
}

重点:自定义设配器Adapter

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;

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

/**
 * Created by 王 on 2017/10/11.
 */

public class MyAdapter extends RecyclerView.Adapter<MyViewHolder> {
    private Context context;

    private List<String> data = new ArrayList<>();
    //创建接口对象
    private OnClickRecyclerListner listner;

    public MyAdapter(Context context) {
        this.context = context;
        //初始化数据
        for (int i = 0; i < 20; i++) {
            data.add("ddd" + i);
        }
    }

    //创建接口点击事件的方法
    public void setLisner(OnClickRecyclerListner lisner) {
        this.listner = lisner;
    }


    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        //填充item布局
        View view = View.inflate(context, R.layout.item, null);
        //创建Viewholder然后把view对象传进去 viewholder从这个view对象里找id 
        final MyViewHolder holder = new MyViewHolder(view);
        //判断是否设置了点击事件
        if (listner != null) {
            view.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    //getLayoutPosition获取点击条目的位置 
                 listner.onItemclick(view,holder.getLayoutPosition());
                }
            });
            view.setOnLongClickListener(new View.OnLongClickListener() {
                @Override
                public boolean onLongClick(View view) {
                   listner.onLongItemclick(view,holder.getLayoutPosition());
                    //为了防止与点击冲突 改为true禁止继续事传递
                    return true;
                }
            });
        }
        return holder;
    }

    //给每一个条目赋值
    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        holder.tv.setText(data.get(position));
    }

    //获取条目数量
    @Override
    public int getItemCount() {
        return data.size();
    }


}

ManActivity里：

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.DividerItemDecoration;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private RecyclerView relist;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        relist = (RecyclerView) findViewById(R.id.relist);
        //样式管理器1 自己试着玩玩吧
        //relist.setLayoutManager(new LinearLayoutManager(this));
        //样式管理器2
        relist.setLayoutManager(new StaggeredGridLayoutManager(1, StaggeredGridLayoutManager.HORIZONTAL));
        //样式管理器3
        // relist.setLayoutManager(new GridLayoutManager(this,3));
        MyAdapter adapter = new MyAdapter(this);
        relist.setAdapter(adapter);
        //添加分割线
        relist.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL));
        //点击事件 注意是adapter不是recyclerview对象，调用的是adapter里的接口点击方法
        adapter.setLisner(new OnClickRecyclerListner() {
            @Override
            public void onItemclick(View view, int position) {
                Toast.makeText(MainActivity.this, position + "", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onLongItemclick(View view, int position) {
                Toast.makeText(MainActivity.this, position + "", Toast.LENGTH_SHORT).show();
            }
        });

    }


}

效果如下：

样式管理器非常多变灵活 自己试验吧~ 很有意思