大體實現思路：

使用相對佈局，在recyclerview的item整體佈局底層新增一個CheckBox，在adapter中引用一個Map標記選中CheckBox，然後在bandview中給CheckBox setOnCheckedChangeListener改變CheckBox背景、向Map中新增標記.

demo連結在文末.

具體實現：

1.activity：

RecyclerView recyclerview;
Adapter mAdapter;
StringBuffer buffer = new StringBuffer();//考慮到執行緒安全，此處使用StringBuffer
boolean 
 
first = true;       //判斷，號的新增
//onCreatView中init 
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
layoutManager.setOrientation(layoutManager.VERTICAL);
recyclerview.setLayoutManager(layoutManager);
recyclerview.addItemDecoration(new SpaceItemDecoration(2));
mAdapter = new Adapter(context,
 
list);
recyclerview.setAdapter(mAdapter);
//在需要用到recyclerview選中的資料時呼叫：
setSelectedData();
//將選中條目新增到StringBuffer中
private void setSelectedData() {
    Map<Integer, Boolean> map = mAdapter.getCheckMap();
    int count = mAdapter.getItemCount();
//int count = adpAdapter.getCount();
for (int i = 0; i < count; 
 
i++) {
        // 因為List的特性,刪除了2個item,則3變成2,所以這裡要進行這樣的換算,才能拿到刪除後真正的position
int position = i - (count - mAdapter.getItemCount());
        if (map.get(i) != null && map.get(i)) {
            DemoBean  bean = mAdapter.getItemData(position);
            if (first) {
                first = false;
} else {
                buffer.append(",");
}
            buffer.append(bean.***);
}
    }
}

2.Adapter 程式碼：

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

    private Context mContext;
    private List<DemoBean> mList;
    private Map<Integer, Boolean> isCheckMap = new HashMap<Integer, Boolean>();
    public Adapter(Context context, List<DemoBean> list) {
        mContext = context;
mList = list;
}

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

    @Override
public void onBindViewHolder(final MyViewHolder holder, final int position) {
        holder.mItemInvitelistIvAvatar.setImage.....;
holder.mItemTvName.setText(mList.get(position).name)

public class MyViewHolder extends RecyclerView.ViewHolder{
        @BindView(R.id.item_iv_avatar)
        ImageView mItemIvAvatar;
@BindView(R.id.item_tv_name)
        TextView mItemTvName;
@BindView(R.id.item_layout)
        LinearLayout mItemLayout;
@BindView(R.id.item_checkbox)
        CheckBox mItemCheckbox;
        public MyViewHolder(View itemView) {
            super(itemView);

   ButterKnife.bind(this, itemView);

}
    public DemoBean getItemData(int position) {
        return this.mList.get(position);
}
    public Map<Integer, Boolean> getCheckMap() {
        return this.isCheckMap;
}
}

佈局檔案：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/white">
    <LinearLayout
android:id="@+id/item_layout"
android:layout_width="match_parent"
android:layout_height="@dimen/m60">
        <ImageView
android:id="@+id/item_iv_avatar"
android:layout_width="@dimen/m40"
android:layout_height="@dimen/m40"
android:layout_gravity="center_vertical"
android:layout_marginLeft="@dimen/m10"
/>
        <TextView
android:id="@+id/item_tv_name"
android:layout_width="@dimen/m0"
android:layout_weight="2"
android:layout_height="match_parent"
android:gravity="center"
android:textSize="18sp"
android:textColor="@color/black"
/>
    </LinearLayout>
    <CheckBox
android:id="@+id/item_checkbox"
android:layout_width="match_parent"
android:layout_height="@dimen/m60"
android:button="@null"
android:focusable="false"/>
</RelativeLayout>

demo下載地址使用recyclerview+checkbox實現recyclerview item選中效果