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RecyclerView简单使用总结_recyclerview 使用方法总结实验报告

作者：2023面试高手 | 2024-05-03 13:31:54

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recyclerview 使用方法总结实验报告

刚学习了RecyclerView，在这里对自己学习的内容进行一个总结，方便以后查看。

现在学习的知识很浅，只是知道如何去使用，而没有去研究它的源码，不知道它的内部具体原理是如何。

这篇文章大概有些说法是不对的，希望下次有机会用到RecyclerView来看这篇文章可以修改里面描述不对的语句。

希望看到这篇文章的人有不对之处可以帮助指出，谢谢。

正文开始。

导入RecyclerView的依赖包

实现类似ListView的功能

RecyclerView与ListView类似，需要适配器来填充数据。具体的步骤与非常熟悉的ListView一样。

首先activity的布局


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
 
    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycler_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"></android.support.v7.widget.RecyclerView>
 
</LinearLayout>

item的布局


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="wrap_content">
 
    <TextView
        android:id="@+id/tv_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="text"
        android:textColor="@color/textColor"
        android:padding="10dp"
        android:gravity="center"
        android:textSize="18sp"
        android:background="@color/textBackground"/>
 
</LinearLayout>

很简单，item就是一个TextView。

适配器


package example.com.rvdemo;
 
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
 
import java.util.List;
 
/**
 * Created by csjy on 2017/4/18.
 */
 
public class RecyclerAdapter  extends RecyclerView.Adapter<RecyclerAdapter.MyViewHolder>{
 
    private List<String> mList;
    private LayoutInflater inflater;
 
    public RecyclerAdapter(Context context, List<String> mList){
        inflater = LayoutInflater.from(context);
        this.mList = mList;
    }
 
    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        MyViewHolder holder = new MyViewHolder(inflater.inflate(R.layout.item_recycler_view,parent,false));
        return holder;
    }
 
    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        holder.tvText.setText(mList.get(position));
    }
 
    @Override
    public int getItemCount() {
        return mList.size();
    }
 
    class MyViewHolder extends RecyclerView.ViewHolder{
 
        private TextView tvText;
 
        public MyViewHolder(View itemView) {
            super(itemView);
            tvText = (TextView) itemView.findViewById(R.id.tv_text);
        }
    }
}

它需要继承RecyclerView的Adapter<VH extends ViewHolder>，所以写一个自己的ViewHolder类继承自RecyclerView的ViewHolder。重写三个方法，方法的功能一看名字就了然。

Activity


package example.com.rvdemo;
 
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 java.util.ArrayList;
import java.util.List;
 
/**
 * Created by csjy on 2017/4/18.
 */
 
public class ListViewActivity extends AppCompatActivity {
 
    private RecyclerView mRecyclerView;
    private Context context;
    private RecyclerAdapter adapter;
 
    private List<String> mList;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.recycler_view);
        initDatas();
        initView();
    }
 
    private void initDatas() {
        mList = new ArrayList<String>();
        for (int i = 0; i < 100; i++){
            mList.add(""+ i);
        }
    }
 
    private void initView() {
        context = MyApplication.getContext();
        mRecyclerView = (RecyclerView) this.findViewById(R.id.recycler_view);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(context));
        adapter = new RecyclerAdapter(context,mList);
        mRecyclerView.setAdapter(adapter);
    }
}

initDatas()方法必须在initView()方法前，不然适配器中getItemCount()返回值为空，很简单的问题，确很容易犯。

效果图

可以看到无分割线。现在给item添加分割线


package example.com.rvdemo;
 
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.RecyclerView;
import android.view.View;
import android.widget.LinearLayout;
 
/**
 * Created by csjy on 2017/4/19.
 */
 
public class RecyclerItemDecoration extends RecyclerView.ItemDecoration {
 
    private static final int[] ATTRS = new int[]{android.R.attr.listDivider};
    /**
     * 分割线
     */
    private Drawable mDivider;
    /**
     * 方向，水平/垂直
     */
    private int mOrientation;
 
    RecyclerItemDecoration(Context context,int orientation){
        TypedArray ta = context.obtainStyledAttributes(ATTRS);
        mDivider = ta.getDrawable(0);
        ta.recycle();
        this.mOrientation = orientation;
    }
 
 
    @Override
    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
        super.onDraw(c, parent, state);
        if(mOrientation == LinearLayout.HORIZONTAL){
            drawHorizontal(c,parent);
        }else if(mOrientation == LinearLayout.VERTICAL){
            drawVertical(c,parent);
        }
    }
 
    private void drawVertical(Canvas c, RecyclerView parent) {
        int left = parent.getLeft();
        int right = parent.getRight();
        int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++){
            View child = parent.getChildAt(i);
            RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
            int top = child.getBottom() + params.bottomMargin;
            int buttom = top + mDivider.getIntrinsicHeight();
            mDivider.setBounds(left,top,right,buttom);
            mDivider.draw(c);
        }
    }
 
    private void drawHorizontal(Canvas c, RecyclerView parent) {
        int top = parent.getTop();
        int bottom = parent.getBottom();
        int childCount = parent.getChildCount();
        for(int i = 0; i < childCount; i++){
            View child = parent.getChildAt(i);
            RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
            int left = child.getLeft() + params.leftMargin;
            int right = left + mDivider.getIntrinsicWidth();
            mDivider.setBounds(left,top,right,bottom);
            mDivider.draw(c);
        }
    }
 
    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        super.getItemOffsets(outRect, view, parent, state);
        if(mOrientation == LinearLayout.VERTICAL){
            outRect.set(0,0,0,mDivider.getIntrinsicHeight());
        }else if(mOrientation == LinearLayout.HORIZONTAL){
            outRect.set(0,0,mDivider.getIntrinsicWidth(),0);
        }
    }
}

首先在onDraw()方法里做一个判断，它的方向是垂直还是水平

drawVertical()与drawHorizontal()方法见图

看到图就知道里面的left、top、right、bottom是怎么算的。

最后调用getItemOffset()方法，画出分割线。

效果图

在这里说几个RecyclerView常用的方法。

setLayoutManager() RecyclerView显示的方式，主要用到有LinearLayoutManager,GridLayoautManager,StaggeredGridLayoutManager（必须）
addItemDecoration() 添加分割线（不是必须）
setAnimation() item增删动画（不是必须）
setAdapter() 适配器，不用说（必须）

实现类似GridView的功能

只需要修改分割线的代码，GridView垂直水平两个方向都有。


package example.com.rvdemo;
 
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.util.Log;
import android.view.View;
import android.widget.LinearLayout;
 
/**
 * Created by csjy on 2017/4/19.
 */
 
public class RecyclerGridItemDecoration extends RecyclerView.ItemDecoration {
 
//    private static final int [] ATTRS = new int[]{android.R.attr.listDivider};
 
    private Drawable mDividerV,mDividerH;
 
//    RecyclerGridItemDecoration(Context context){
//
//        TypedArray ta = context.obtainStyledAttributes(ATTRS);
//        mDividerV = ta.getDrawable(0);
//        ta.recycle();
//    }
 
    RecyclerGridItemDecoration(Context context,int drawableVertical,int drawableHorizontal){
        mDividerV = context.getResources().getDrawable(drawableVertical);
        mDividerH = context.getResources().getDrawable(drawableHorizontal);
    }
 
    @Override
    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
        super.onDraw(c, parent, state);
        drawVertical(c,parent);
        drawHorizontal(c,parent);
    }
 
    private void drawHorizontal(Canvas c, RecyclerView parent) {
        int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++){
            View child = parent.getChildAt(i);
            LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) parent.getLayoutParams();
            final int left = child.getLeft() + params.leftMargin;
            final int right = child.getRight() + params.rightMargin
                    + mDividerH.getIntrinsicWidth();
            final int top = child.getBottom() + params.bottomMargin;
            final int bottom = top + mDividerH.getIntrinsicHeight();
            mDividerH.setBounds(left, top, right, bottom);
            mDividerH.draw(c);
        }
    }
 
    private void drawVertical(Canvas c, RecyclerView parent) {
        int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++){
            View child = parent.getChildAt(i);
            LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) parent.getLayoutParams();
            final int top = child.getTop() - params.topMargin;
            final int bottom = child.getBottom() + params.bottomMargin;
            final int left = child.getRight() + params.rightMargin;
            final int right = left + mDividerV.getIntrinsicWidth();
            mDividerV.draw(c);
            mDividerV.setBounds(left,top,right,bottom);
        }
    }
 
    /**
     * 获取行/列数
     * @param parent
     * @return
     */
    private int getSpanCount(RecyclerView parent){
        int spanCount = 0;
        RecyclerView.LayoutManager manager = parent.getLayoutManager();
        if(manager instanceof GridLayoutManager){
            spanCount = ((GridLayoutManager) manager).getSpanCount();
        }else if(manager instanceof StaggeredGridLayoutManager){
            spanCount = ((StaggeredGridLayoutManager) manager).getSpanCount();
        }
        return spanCount;
    }
 
    /**
     * 判断是否是最后一列
     * 如果是最后一列就不画最右边的分割线
     * true：是最后一列
     * false： 不是最后一列
     * @param parent
     * @param position  item的位置
     * @param childCount  item的总数
     * @param spanCount  行/列数
     * @return
     */
    private boolean isLastColum(RecyclerView parent, int position, int childCount, int spanCount){
        RecyclerView.LayoutManager manager = parent.getLayoutManager();
        if(manager instanceof GridLayoutManager){
            if((position + 1) % spanCount == 0){
                return true;
            }
        }else if(manager instanceof StaggeredGridLayoutManager){
            int orientation = ((StaggeredGridLayoutManager) manager).getOrientation();
            if(orientation == StaggeredGridLayoutManager.VERTICAL){
                if((position + 1) % spanCount == 0){
                    return true;
                }
            }else if(orientation == StaggeredGridLayoutManager.HORIZONTAL){
                childCount = (childCount % spanCount == 0)?(childCount - spanCount):(childCount - childCount % spanCount);
                if (position >= childCount){
                    return true;
                }
            }
        }
        return false;
    }
 
    /**
     * 判断是否是最后一行
     * 如果是最后一行，就不画最下边的分割线
     * true ：是最后一行
     * false： 不是最后一行
     * @param parent
     * @param position  当前的位置
     * @param childCount  item的总数
     * @param spanCount  行/列数
     * @return
     */
    private boolean isLastRow(RecyclerView parent, int position, int childCount, int spanCount){
        RecyclerView.LayoutManager manager = parent.getLayoutManager();
        if(manager instanceof GridLayoutManager){
            childCount = (childCount % spanCount == 0)?(childCount - spanCount):(childCount - childCount % spanCount);
            if (position >= childCount){
                return true;
            }
        }else if(manager instanceof StaggeredGridLayoutManager){
            int orientation = ((StaggeredGridLayoutManager) manager).getOrientation();
            if(orientation == StaggeredGridLayoutManager.VERTICAL){
                childCount = (childCount % spanCount == 0)?(childCount - spanCount):(childCount - childCount % spanCount);
                if (position >= childCount){
                    return true;
                }
            }else if(orientation == StaggeredGridLayoutManager.HORIZONTAL){
                if((position + 1) % spanCount == 0){
                    return true;
                }
            }
        }
        return false;
    }
 
    @Override
    public void getItemOffsets(Rect outRect, int itemPosition, RecyclerView parent) {
        super.getItemOffsets(outRect, itemPosition, parent);
        Log.d("Tag","itemPosition====" + itemPosition);
        int spanCount = getSpanCount(parent);
        int childCount = parent.getAdapter().getItemCount();
 
        outRect.set(0, 0, isLastColum(parent,itemPosition,childCount,spanCount) ? 0 : mDividerV.getIntrinsicWidth(),
                    isLastRow(parent,itemPosition,childCount,spanCount) ? 0 : mDividerH.getIntrinsicHeight());
 
    }
 
}

Activity的代码：


package example.com.rvdemo;
 
import android.content.Context;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
 
import java.util.ArrayList;
import java.util.List;
 
/**
 * Created by csjy on 2017/4/18.
 */
 
public class GridViewActivity extends AppCompatActivity {
 
    private RecyclerView mRecyclerView;
    private Context context;
    private RecyclerAdapter adapter;
 
    private List<String> mList;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.recycler_view);
        initDatas();
        initView();
    }
 
    private void initDatas() {
        mList = new ArrayList<String>();
        for (int i = 0; i < 100; i++){
            mList.add(""+ i);
        }
    }
 
    private void initView() {
        context = MyApplication.getContext();
        mRecyclerView = (RecyclerView) this.findViewById(R.id.recycler_view);
        mRecyclerView.setLayoutManager(new GridLayoutManager(context,4));
        adapter = new RecyclerAdapter(context,mList);
        mRecyclerView.setAdapter(adapter);
        RecyclerGridItemDecoration decoration = new RecyclerGridItemDecoration(context,R.drawable.divider_vertical,R.drawable.divider);
        mRecyclerView.addItemDecoration(decoration);
    }
}

两个drawable：


<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >
    <solid android:color="#0011ff"/>
    <size android:height="4dp"/>
 
</shape>


<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >
    <solid android:color="#FFFF0004"/>
    <size android:width="4dp"/>
 
</shape>

首先画水平，垂直的分割线。看图

看图一目了然，接下来getSpanCount()方法，用来获取行数或者列数，首先实例化LayoutManager，判断LayoutManager的实例为GridLayoutManager还是StaggeredGridLayoutManager，调用相应LayoutManager的getSpanCount()获取行/列数。

isLastColumn()与isLastRow()方法判断是否为最后一列，最后一行。

首先先解释GridLayoutManger，如果是垂直的情况，见下图

判断是否为最后一列：

这里假设有3列，spanCount = 3; 用position + 1 与spanCount求余，第一行：3%3 =0；第二行：6%3=0，所以，如果为零，说明为最后一列，返回true。

判断是否为最后一行：

假设item的总数为100，childCount = 100; 用childCount与spanCount求余，childCount % spanCount == 0，就是标准的column*row；childCount % spanCount == 1：见上图，以此类推。

进行一个判断，如果childCount % spanCount == 0，就是标准的column*row，将childCount - spanCount 赋值给childCount，至于为什么要这样赋值，是因为

childCount - spanCount 就相当于把最后一行减去，一旦当前item的位置大于倒数第二行，就说明是最后一行（这说的有点抽象。。但是挺好理解的）。如果

childCount % spanCount != 0，用childCount - childCount % spanCount也是把最后一行减去，那么一旦当前item的位置大于倒数第二行，就说明是最后一行。

最后调用getItemOffet()方法做一个小偏移。

水平的情况：

判断最后一列的情况就与垂直情况下的判断最后一行的情况一样，见代码

判断最后一行的情况就与垂直情况下的判断最后一列的情况一样。

StaggeredGridLayoutManager的判断方式与GridLayoutManager的方式一样，看到代码就可以理解。

效果图：

实现类似瀑布流的功能

只需要简单修改适配器的代码，给item加上随机的高度就可以，修改几句代码，改为：


mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(6,StaggeredGridLayoutManager.VERTICAL));
adapter = new StaggeredAdapter(context,mList);
mRecyclerView.setAdapter(adapter);

修改后的适配器代码：


package example.com.rvdemo;
 
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;
 
import java.util.ArrayList;
import java.util.List;
 
/**
 * Created by csjy on 2017/4/19.
 */
 
public class StaggeredAdapter extends RecyclerView.Adapter<StaggeredAdapter.MyViewHolder>{
 
    private List<String> mList;
    private List<Integer> mHeight;
    private LayoutInflater inflater;
 
    StaggeredAdapter(Context context,List<String> mList){
        inflater = LayoutInflater.from(context);
        this.mList = mList;
        mHeight = new ArrayList<Integer>();
        for(int i = 0; i < mList.size(); i++){
            mHeight.add((int)(200 + Math.random() * 500));
            Log.d("Tag", String.valueOf((100 + Math.random() * 300)));
        }
    }
 
    @Override
    public StaggeredAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        MyViewHolder holder = new MyViewHolder(inflater.inflate(R.layout.item_recycler_view,parent,false));
        return holder;
    }
 
    @Override
    public void onBindViewHolder(StaggeredAdapter.MyViewHolder holder, int position) {
        LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) holder.tvText.getLayoutParams();
        params.height = mHeight.get(position);
        holder.tvText.setLayoutParams(params);
        holder.tvText.setText(mList.get(position));
    }
 
    @Override
    public int getItemCount() {
        return mList.size();
    }
 
    class MyViewHolder extends RecyclerView.ViewHolder{
        private TextView tvText;
        public MyViewHolder(View itemView) {
            super(itemView);
            tvText = (TextView) itemView.findViewById(R.id.tv_text);
        }
    }
}

只是新增了一个给item设置随机的高。

效果图：

实现类似Gallery的功能

先看效果图

思路如下：自定义一个RecyclerView，定义一个接口，当RecyclerView发生滚动时回调。

自定义RecyclerView：


package example.com.rvdemo;
 
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.util.AttributeSet;
import android.view.View;
 
/**
 * Created by csjy on 2017/4/20.
 */
 
public class MyRecyclerView extends RecyclerView {
 
    private View currentView;
 
    public MyRecyclerView(Context context,AttributeSet attrs) {
        super(context, attrs);
    }
 
    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);
        if (onItemScrollListener != null) {
            currentView = getChildAt(0);
            onItemScrollListener.OnChange(currentView,getChildAdapterPosition(currentView));
        }
    }
 
    public interface OnItemScrollListener{
        void OnChange(View view,int position);
    }
 
    private OnItemScrollListener onItemScrollListener;
 
    public void setOnItemScrollListener(OnItemScrollListener onItemScrollListener) {
        this.onItemScrollListener = onItemScrollListener;
    }
 
    @Override
    public void onScrolled(int dx, int dy) {
        super.onScrolled(dx, dy);
        View newView;
        newView = getChildAt(0);
        if(onItemScrollListener != null){
            if (newView != null && newView != currentView){
                currentView = newView;
                onItemScrollListener.OnChange(currentView,getChildAdapterPosition(currentView));
            }
        }
    }
}

adapter：


package example.com.rvdemo;
 
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 java.util.List;
 
/**
 * Created by csjy on 2017/4/19.
 */
 
public class GalleryAdapter extends RecyclerView.Adapter<GalleryAdapter.MyViewHolder>{
 
    private List<Integer> mList;
    private LayoutInflater inflater;
 
    GalleryAdapter(Context context, List<Integer> mList) {
 
        inflater = LayoutInflater.from(context);
        this.mList = mList;
 
    }
 
    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        MyViewHolder holder = new MyViewHolder(inflater.inflate(R.layout.item_recycler_gallery,parent,false));
        return holder;
    }
 
    @Override
    public void onBindViewHolder(MyViewHolder holder, final int position) {
        holder.ivImage.setBackgroundResource(mList.get(position));
 
        if (onItemClickListener != null){
            holder.ivImage.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    onItemClickListener.onItemClick(position);
                }
            });
        }
    }
 
    @Override
    public int getItemCount() {
        return mList.size();
    }
 
    class MyViewHolder extends RecyclerView.ViewHolder{
 
        private ImageView ivImage;
 
        public MyViewHolder(View itemView) {
            super(itemView);
 
            ivImage = (ImageView) itemView.findViewById(R.id.iv_image);
        }
    }
 
    public interface OnItemClickListener{
        void onItemClick(int position);
    }
 
    private OnItemClickListener onItemClickListener;
 
    public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
        this.onItemClickListener = onItemClickListener;
    }
}

adapter中自定义了一个接口，当有点击事件时回调。

Activity：


package example.com.rvdemo;
 
import android.content.Context;
import android.content.Intent;
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.ImageView;
import android.widget.Toast;
 
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
 
/**
 * Created by csjy on 2017/4/19.
 */
 
public class GalleryActivity extends AppCompatActivity{
 
    private MyRecyclerView mRecyclerView;
    private Context context;
    private GalleryAdapter adapter;
 
    private List<Integer> mList;
    private ImageView ivBig;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.recycler_gallery);
        initDatas();
        initView();
        initEvent();
    }
 
    private void initEvent() {
        adapter.setOnItemClickListener(new GalleryAdapter.OnItemClickListener() {
            @Override
            public void onItemClick(int position) {
//                Toast.makeText(context, "you click" + position, Toast.LENGTH_SHORT).show();
                ivBig.setBackgroundResource(mList.get(position));
            }
        });
 
        mRecyclerView.setOnItemScrollListener(new MyRecyclerView.OnItemScrollListener() {
            @Override
            public void OnChange(View view, int position) {
                ivBig.setBackgroundResource(mList.get(position));
            }
        });
    }
 
    private void initDatas() {
        mList = new ArrayList<Integer>(Arrays.asList(R.mipmap.a,R.mipmap.b,R.mipmap.c,R.mipmap.d,R.mipmap.e,
                R.mipmap.f,R.mipmap.g,R.mipmap.h,R.mipmap.i,R.mipmap.j,R.mipmap.k,R.mipmap.l,R.mipmap.m));
    }
 
    private void initView() {
        context = MyApplication.getContext();
        mRecyclerView = (MyRecyclerView) this.findViewById(R.id.gallery_recycler);
        LinearLayoutManager manager = new LinearLayoutManager(context);
        manager.setOrientation(LinearLayoutManager.HORIZONTAL);
        mRecyclerView.setLayoutManager(manager);
        adapter = new GalleryAdapter(context,mList);
        mRecyclerView.setAdapter(adapter);
 
        ivBig = (ImageView)this.findViewById(R.id.iv_big_image);
    }
}

activity很简单，一看就明白，这里不做记录。

参考自：【张鸿洋的博客】http://blog.csdn.net/lmj623565791/article/details/38173061

完毕。

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