RecyclerView(二)：+SnapHelper实现类似ViewPager效果

代码在RecyclerView（一）的基础上做修改实现类似ViewPager左右滑动显示效果，
直接上代码：
A activity_main.xml

B MainActivity.java

package com.example.aaaaa.recyclerviewtest;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.DividerItemDecoration;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.PagerSnapHelper;
import android.support.v7.widget.RecyclerView;
import android.widget.LinearLayout;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        RecyclerView recyclerView = (RecyclerView)findViewById(R.id.recyclerview);
        // 设置布局管理器
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
        linearLayoutManager.setOrientation(LinearLayout.HORIZONTAL);
        recyclerView.setLayoutManager(linearLayoutManager);
        // 设置item添加、移除动画
        recyclerView.setItemAnimator(new DefaultItemAnimator());
        // 添加分割线
        recyclerView.addItemDecoration(new DividerItemDecoration(
                getApplicationContext(), DividerItemDecoration.VERTICAL));
        //实现viewPager效果核心代码
        new PagerSnapHelper().attachToRecyclerView(recyclerView);
        // 添加adapter
        RecyclerView.Adapter adapter = new RecyclerViewTestAdapter();
        recyclerView.setAdapter(adapter);
    }
}

C recyclerview_item.xml

D RecyclerViewTestAdapter.java

package com.example.aaaaa.recyclerviewtest;

import android.content.Context;
import android.content.res.Resources;
import android.support.v7.widget.RecyclerView;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

/**
 * Created by 49375 on 2019/3/19.
 */
public class RecyclerViewTestAdapter extends RecyclerView.Adapter {
    @Override
    public RecyclerViewTestAdapter.MyHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.recyclerview_item, null);
        MyHolder myHolder = new MyHolder(view);
        return myHolder;
    }

    @Override
    public void onBindViewHolder(RecyclerViewTestAdapter.MyHolder holder, int position) {
        holder.textView1.setText("pos:" + position);
    }

    @Override
    public int getItemCount() {
        return 10;
    }

    // ViewHolder用来初始化控件
    public class MyHolder extends RecyclerView.ViewHolder {
        TextView textView1;
        public MyHolder(View itemView) {
            super(itemView);
            textView1 = (TextView)itemView.findViewById(R.id.recyclerview_item_text);
            // 设置显示宽高
            float[] size = getDeviceDisplaySize(itemView.getContext());
            itemView.setMinimumWidth((int) size[0]);
        }

        public  float[] getDeviceDisplaySize(Context context) {
            Resources resources = context.getResources();
            DisplayMetrics dm = resources.getDisplayMetrics();
            int width = dm.widthPixels;
            int height = dm.heightPixels;
            float[] size = new float[2];
            size[0] = width;
            size[1] = height;
            return size;
        }
    }
}