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RecyclerView 之 EmptyView(突然修改时的省事方法)

在使用RecyclerView 时一开始常常忽略EmptyView,等代码写完了后发现，如果大幅度修改就比较头疼，一旦写不好需要推到重来，终于，想了一个有意思的办法,在adapter 里的 item 添加一个EmptyView，代码如下供大家参考。
1. adapter 实现

public class MessagesAdapter extends RecyclerView.Adapter<MessagesAdapter.ViewHolder> implements View.OnClickListener{    private Context context;    private List<OrderListBean.DataEntity> data;    private int flag=0;//通过flag 判断是否有数据    private LayoutInflater inflater;    private OnRecyclerViewItemClickListener mOnItemClickListener = null;    public MessagesAdapter(Context context) {        this.context=context;        this.data = new ArrayList<OrderListBean.DataEntity>();    }    public void setData(List<OrderListBean.DataEntity> data1) {        data.clear();        if(data1.size()==0){            flag=1;//数据拿到后为空时        }        data.addAll(data1);        notifyDataSetChanged();    }    @Override    public void onClick(View v) {        if (mOnItemClickListener != null) {            //注意这里使用getTag方法获取数据            mOnItemClickListener.onItemClick(v,(OrderListBean.DataEntity)v.getTag());        }    }    @Override    public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {        inflater= LayoutInflater.from(viewGroup.getContext());        View view= inflater.inflate(R.layout.item_messages, viewGroup,false);        ViewHolder viewHolder = new ViewHolder(view);        if(data.size()!=0){            view.setOnClickListener(this);        }        return viewHolder;    }    @Override    public void onBindViewHolder(ViewHolder holder, int position) {        if(data.size()==0){            if(flag==1){                holder.img.setVisibility(View.INVISIBLE);                holder.rl.setVisibility(View.GONE);                holder.ivNo.setVisibility(View.VISIBLE);            }        }else {            holder.rl.setVisibility(View.VISIBLE);            holder.ivNo.setVisibility(View.GONE);            holder.img.setVisibility(View.VISIBLE);            if(!TextUtils.isEmpty(data.get(position).getNodeName())){                holder.content.setText(data.get(position).getNodeName());            }            if(!TextUtils.isEmpty(data.get(position).getCheckDate())){                holder.time.setText(data.get(position).getCheckDate());            }            holder.itemView.setTag(data.get(position));        }    }    @Override    public int getItemCount() {        if(flag==1){            return 1;        }        return data.size();    }    public static interface OnRecyclerViewItemClickListener {        void onItemClick(View view, OrderListBean.DataEntity data);    }    public void setOnItemClickListener(OnRecyclerViewItemClickListener listener) {        this.mOnItemClickListener = listener;    }    public class ViewHolder extends RecyclerView.ViewHolder{        public ViewHolder(View itemView) {            super(itemView);            content=(TextView)itemView.findViewById(R.id.item_cotent);            time=(TextView)itemView.findViewById(R.id.item_time);            title=(TextView)itemView.findViewById(R.id.item_title);            img=(ImageView)itemView.findViewById(R.id.iv_message);            rl=(RelativeLayout) itemView.findViewById(R.id.rl_msg);            ivNo=(ImageView)itemView.findViewById(R.id.item_no_msg);        }        TextView content;        TextView time;        ImageView img;        RelativeLayout rl;        ImageView ivNo;    }}

2。item 界面：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:orientation="vertical"    xmlns:tools="http://schemas.android.com/tools">    <RelativeLayout        android:id="@+id/rl_msg"        android:layout_width="match_parent"        android:layout_height="90dp">        <ImageView            android:id="@+id/iv_message"            android:layout_width="40dp"            android:layout_height="40dp"            android:layout_marginTop="16dp"            android:layout_marginLeft="20dp"            android:visibility="invisible"            android:src="@mipmap/ic_notice"/>        <TextView            android:id="@+id/item_time"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_marginTop="16dp"            android:layout_alignParentRight="true"            android:layout_marginRight="20dp"            android:textSize="12sp"            tools:text=""/>        <TextView            android:id="@+id/item_cotent"            android:layout_width="match_parent"            android:layout_height="match_parent"              android:paddingLeft="20dp"            android:layout_toRightOf="@+id/iv_message"            android:layout_toLeftOf="@+id/item_time"            android:gravity="left|center"            tools:text=""            android:textSize="12sp"/>        <View            android:layout_width="match_parent"            style="@style/line_activity_divide"            android:layout_alignParentBottom="true"/>    </RelativeLayout>    <ImageView        android:id="@+id/item_no_msg"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginTop="20dp"        android:visibility="gone"        android:src="@mipmap/ic_no_msg"/></LinearLayout>

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