使用sticky-headers-recyclerview 完成 recyclerview粘性头部

首先是xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout         xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">

<android.support.v7.widget.RecyclerView
android:id="@+id/RecyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#fff"
android:scrollbars="none" />
</RelativeLayout>

Activity 初始化 RecyclerView

public class WithLookPlanActivity extends Activity {

private StickyRecyclerHeadersDecoration topStickyHeadersItemDecoration;
private RecyclerView recyclerView;

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

private void initView() {
recyclerView = (RecyclerView) findViewById(R.id.withLookRv);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerViewAdapter adapter= new recyclerViewAdapter(dataList);
recyclerView.setAdapter(recyclerViewAdapter);
topStickyHeadersItemDecoration = new StickyRecyclerHeadersDecoration(recyclerViewAdapter); //设置recyclerView需要的Decoration
}

RecyclerViewAdapter -- 绑定head

public class WithLookPlanAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> implements StickyRecyclerHeadersAdapter<RecyclerView.ViewHolder> {
//继承并实现StickyRecyclerHeadersAdapter

private List<dataList> dataList;

public WithLookPlanAdapter(List<WithLookPlansListData> dataList) {
this.dataList = dataList;
setHasStableIds(true);
}

@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_list, parent, false);
return new MyViewHolder(itemView);
}

@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {

final MyViewHolder myViewHolder = (MyViewHolder) holder;
if (position >= dataList.size()) {
return;
}

String name = dataList.get(position).name;
String age = dataList.get(position).age

}

@Override
public int getItemCount() {
return dataList.size();
}

//必须重写  不然item会错乱
@Override
public long getItemId(int position) {
return position;
}

@Override
public RecyclerView.ViewHolder onCreateHeaderViewHolder(ViewGroup parent) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_header_view, parent, false);
return new MyHeaderViewHolder(itemView);
} //headView

@Override
public void onBindHeaderViewHolder(RecyclerView.ViewHolder viewHolder, int position) {
MyHeaderViewHolder myHeaderViewHolder = (MyHeaderViewHolder) viewHolder;
myHeaderViewHolder.title.setText(dataList.get(position).name);  //设置head数据
}

@Override
public long getHeaderId(int position) {
long headName = dataList.get(position).name.hashCode();

return headName;
//得到headId 唯一性
}

public class MyViewHolder extends RecyclerView.ViewHolder {
public TextView nameTv;
public TextView ageTv;

public MyViewHolder(View view) {
super(view);
nameTv = (TextView) view.findViewById(R.id.nameTv);
ageTv = (TextView) view.findViewById(R.id.ageTv);
}
}// item

public static class MyHeaderViewHolder extends RecyclerView.ViewHolder {

TextView title;

public MyHeaderViewHolder(View itemView) {
super(itemView);
title = (TextView) itemView.findViewById(R.id.HeadTv);
} //head
}