Android中RecyclerView实现横向滑动代码

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package com.info.activity; 
import android.app.Activity; 
import android.content.Context; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.support.v7.widget.LinearLayoutManager; 
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 java.util.ArrayList; 
import java.util.Arrays; 
import java.util.List; 
public class RecyclerActivity extends Activity { 
private RecyclerView mRecyclerView; 
private GalleryAdapter mAdapter; 
private List mDatas; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_recycler); 
initDatas(); 
//得到控件 
mRecyclerView = (RecyclerView) findViewById(R.id.id_recyclerview_horizontal); 
//设置布局管理器 
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this); 
linearLayoutManager.setOrientation(LinearLayoutManager.HORIZONTAL); 
mRecyclerView.setLayoutManager(linearLayoutManager); 
//设置适配器 
mAdapter = new GalleryAdapter(this, mDatas); 
mRecyclerView.setAdapter(mAdapter); 
} 
private void initDatas() 
{ 
mDatas = new ArrayList<>(Arrays.asList(R.drawable.ic_launcher, 
R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, 
R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher)); 
} 
public class GalleryAdapter extends 
RecyclerView.Adapter 
{ 
private LayoutInflater mInflater; 
private List mDatas; 
public GalleryAdapter(Context context, List datats) 
{ 
mInflater = LayoutInflater.from(context); 
mDatas = datats; 
} 
public class ViewHolder extends RecyclerView.ViewHolder 
{ 
public ViewHolder(View arg0) 
{ 
super(arg0); 
} 
ImageView mImg; 
TextView mTxt; 
} 
@Override 
public int getItemCount() 
{ 
return mDatas.size(); 
} 
/** 
* 创建ViewHolder 
*/ 
@Override 
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) 
{ 
View view = mInflater.inflate(R.layout.activity_recycler_item, 
viewGroup, false); 
ViewHolder viewHolder = new ViewHolder(view); 
viewHolder.mImg = (ImageView) view 
.findViewById(R.id.id_index_gallery_item_image); 
return viewHolder; 
} 
/** 
* 设置值 
*/ 
@Override 
public void onBindViewHolder(final ViewHolder viewHolder, final int i) 
{ 
viewHolder.mImg.setImageResource(mDatas.get(i)); 
} 
} 
}