android recyclerview的使用，添加分割线，点击，长按事件

1.首先，在

dependencies里面，添加
compile 'com.android.support:recyclerview-v7:25.3.1'
2.activity的布局文件：
<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.myapplication.MainActivity">


    <android.support.v7.widget.RecyclerView
        android:id="@+id/id_recyclerview"
        android:divider="#ffff0000"
        android:dividerHeight="10dp"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>
3.主界面：
package com.example.myapplication;


import android.content.Context;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.Toast;

import java.util.ArrayList;


public class MainActivity extends AppCompatActivity {


    private RecyclerView mRecyclerView;
    private HomeAdapter mAdapter;
    private Context mContext;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        mContext = MainActivity.this;


        mRecyclerView = (RecyclerView) findViewById(R.id.id_recyclerview);


        initRecyclerView();


    }


    private void initRecyclerView() {
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
        mAdapter = new HomeAdapter(mContext, initData());
        mRecyclerView.setAdapter(mAdapter);
        //添加分割线
        mRecyclerView.addItemDecoration(new DividerItemDecoration(this,
                DividerItemDecoration.VERTICAL_LIST));


        mAdapter.setOnItemClickLitener(new HomeAdapter.OnItemClickLitener() {

            @Override
            public void onItemClick(View view, int position) {
                Toast.makeText(mContext, position + " click." + mAdapter.getItem(position),
                        Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onItemLongClick(View view, int position) {
                Toast.makeText(mContext, position + " long click",
                        Toast.LENGTH_SHORT).show();
                mAdapter.removeData(position);
            }
        });
    }

    /**
     * 取得数据
     *
     * @return
     */
    protected ArrayList<String> initData() {
        ArrayList<String> mDatas = new ArrayList<>();
        for (int i = 'A'; i < 'z'; i++) {
            mDatas.add("" + (char) i);
        }

        return mDatas;
    }


}
4.适配器类：
package com.example.myapplication;

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.TextView;

import java.util.ArrayList;

/**
 * Created by wjj on 2017/6/24.
 */

class HomeAdapter extends RecyclerView.Adapter<HomeAdapter.MyViewHolder> {


    private ArrayList<String> mDatas;

    private Context mContext;

    public HomeAdapter(ArrayList<String> data) {
        this.mDatas = data;
    }

    public HomeAdapter(Context mContext, ArrayList<String> data) {
        this.mContext = mContext;
        this.mDatas = data;
    }

    /**
     * item点击事件接口
     */

    public interface OnItemClickLitener {
        void onItemClick(View view, int position);

        void onItemLongClick(View view, int position);
    }

    private OnItemClickLitener mOnItemClickLitener;

    public void setOnItemClickLitener(OnItemClickLitener mOnItemClickLitener) {
        this.mOnItemClickLitener = mOnItemClickLitener;
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        MyViewHolder holder = new MyViewHolder(LayoutInflater.from(
                mContext).inflate(R.layout.item_home, parent,
                false));
        return holder;
    }


    /**
     * 获取内容
     *
     * @param position
     * @return
     */
    public String getItem(int position) {
        return mDatas.get(position);
    }


    @Override
    public void onBindViewHolder(final HomeAdapter.MyViewHolder holder, final int position) {
        holder.tv.setText(mDatas.get(position));

        // 如果设置了回调，则设置点击事件
        if (mOnItemClickLitener != null) {
            holder.itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {//单击
                    int pos = holder.getLayoutPosition();
                    mOnItemClickLitener.onItemClick(holder.itemView, pos);
                }
            });

            holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
                @Override
                public boolean onLongClick(View v) {//长按
                    int pos = holder.getLayoutPosition();
                    mOnItemClickLitener.onItemLongClick(holder.itemView, pos);
                    return false;
                }
            });
        }
    }

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


    /**
     * 添加数据
     *
     * @param position
     */
    public void addData(int position) {
        mDatas.add(position, "Insert One");
        notifyItemInserted(position);
    }

    /**
     * 移除数据
     *
     * @param position
     */
    public void removeData(int position) {
        mDatas.remove(position);
        notifyItemRemoved(position);
    }


    class MyViewHolder extends RecyclerView.ViewHolder {

        TextView tv;

        public MyViewHolder(View view) {
            super(view);
            tv = (TextView) view.findViewById(R.id.id_num);
        }


    }


}

5.自定义分割线：
package com.example.myapplication;

/**
 * Created by wjj on 2017/6/24.
 */

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;


/**
 * This class is from the v7 samples of the Android SDK. It's not by me!
 * <p/>
 * See the license above for details.
 */
public class DividerItemDecoration extends RecyclerView.ItemDecoration {

    private static final int[] ATTRS = new int[]{
            android.R.attr.listDivider
    };

    public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;

    public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;

    private Drawable mDivider;

    private int mOrientation;

    public DividerItemDecoration(Context context, int orientation) {
        final TypedArray a = context.obtainStyledAttributes(ATTRS);
        mDivider = a.getDrawable(0);
        a.recycle();
        setOrientation(orientation);
    }

    public void setOrientation(int orientation) {
        if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) {
            throw new IllegalArgumentException("invalid orientation");
        }
        mOrientation = orientation;
    }

    @Override
    public void onDraw(Canvas c, RecyclerView parent) {
        Log.v("itemdecoration", "onDraw()");

        if (mOrientation == VERTICAL_LIST) {
            drawVertical(c, parent);
        } else {
            drawHorizontal(c, parent);
        }

    }


    public void drawVertical(Canvas c, RecyclerView parent) {
        final int left = parent.getPaddingLeft();
        final int right = parent.getWidth() - parent.getPaddingRight();

        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            android.support.v7.widget.RecyclerView v = new android.support.v7.widget.RecyclerView(parent.getContext());
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                    .getLayoutParams();
            final int top = child.getBottom() + params.bottomMargin;
            final int bottom = top + mDivider.getIntrinsicHeight();
            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);
        }
    }

    public void drawHorizontal(Canvas c, RecyclerView parent) {
        final int top = parent.getPaddingTop();
        final int bottom = parent.getHeight() - parent.getPaddingBottom();

        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                    .getLayoutParams();
            final int left = child.getRight() + params.rightMargin;
            final int right = left + mDivider.getIntrinsicHeight();
            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);
        }
    }

    @Override
    public void getItemOffsets(Rect outRect, int itemPosition, RecyclerView parent) {
        if (mOrientation == VERTICAL_LIST) {
            outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
        } else {
            outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
        }
    }
}
6.recyclerview的布局xml：
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#44ff0000">

    <TextView
        android:id="@+id/id_num"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:gravity="center"
        android:text="111" />
</FrameLayout>
7.分割线的粗细颜色divider.xml（在drawable目录下）：
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="#7b7a7a" />
    <size android:height="2dp" />
</shape>
8.styles.xml
<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <item name="android:listDivider">@drawable/divider</item>
    </style>

</resources>