RecyclerView：带header的grid

RecyclerView是一个高度可定制性的View
本文将使用RecyclerView实现带header的grid

为了用RecyclerView创建一个带header的grid：

1，定义一个具有两种view类型的adapter，一个为header，一个为普通item。

2，nflate一个header，把它传递给adapter。

3，重写GridLayoutManager中的setSpanSizeLookup，在header所处的位置返回和span count （列数）相等的 span size。

import java.util.ArrayList;import java.util.List;import com.example.test.R;import com.widget.view.HeaderAdapter.ViewHolder;import android.support.v7.widget.RecyclerView;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;/** * 为了用RecyclerView创建一个带header的grid：1,定义一个具有两种view类型的adapter，一个为header一个为普通item。2,inflate一个header，把它传递给adapter。3,重写GridLayoutManager中的setSpanSizeLookup，在header所处的位置返回和span count（列数）相等的 span size。 * @author Administrator * */public class HeaderAdapter extends RecyclerView.Adapter<ViewHolder> {private static final int ITEM_VIEW_TYPE_HEADER = 0;private static final int ITEM_VIEW_TYPE_ITEM = 1;private final View header;private final List<String> labels;public HeaderAdapter(View header, int count) {if (header == null) {throw new IllegalArgumentException("header may not be null");}this.header = header;this.labels = new ArrayList<String>(count);for (int i = 0; i < count; ++i) {labels.add(String.valueOf(i));}}public boolean isHeader(int position) {return position == 0;}@Overridepublic ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {if (viewType == ITEM_VIEW_TYPE_HEADER) {return new ViewHolder(header);}View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item, parent, false);return new ViewHolder(view);}@Overridepublic void onBindViewHolder(final ViewHolder holder, final int position) {if (isHeader(position)) {return;}final String label = labels.get(position - 1); // Subtract 1 for headerholder.textView.setText(label);}@Overridepublic int getItemViewType(int position) {return isHeader(position) ? ITEM_VIEW_TYPE_HEADER : ITEM_VIEW_TYPE_ITEM;}@Overridepublic int getItemCount() {return labels.size() + 1;}class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{public TextView textView;public ViewHolder(View itemView) {super(itemView);if (onItemClickLitener != null){itemView.setOnClickListener(this);            }textView = (TextView) itemView.findViewById(R.id.item_0);}@Overridepublic void onClick(View v) {// TODO Auto-generated method stubonItemClickLitener.onItemClick(v, getLayoutPosition());//getPosition()被废弃了}}private static OnItemClickLitener onItemClickLitener;public void setOnItemClickLitener(OnItemClickLitener onItemClickLitener) {this.onItemClickLitener = onItemClickLitener;}public interface OnItemClickLitener {void onItemClick(View view, int position);}}

recyclerView = (RecyclerView) findViewById(R.id.recyclerView);View header = LayoutInflater.from(this).inflate(R.layout.header_view, recyclerView, false);final HeaderAdapter adapter = new HeaderAdapter(header, 30);adapter.setOnItemClickLitener(new HeaderAdapter.OnItemClickLitener() {@Overridepublic void onItemClick(View view, int position) {// TODO Auto-generated method stubif(adapter.isHeader(position)){Toast.makeText(context, "header clicked", Toast.LENGTH_SHORT).show();}else{Toast.makeText(context, "header item "+(position-1), Toast.LENGTH_SHORT).show();}}});        final GridLayoutManager manager = new GridLayoutManager(this, 3);        manager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {@Overridepublic int getSpanSize(int position) {return adapter.isHeader(position) ? manager.getSpanCount() : 1;}});        recyclerView.setLayoutManager(manager);        recyclerView.setAdapter(adapter);

具体描述看原帖，我只是稍稍改了一下
http://www.open-open.com/lib/view/open1437662138631.html
如果你觉得使用RecyclerView添加Header比较烦，那没办法，就使用这个HeaderGridView类吧
RecyclerView 必知必会
http://mp.weixin.qq.com/s/CzrKotyupXbYY6EY2HP_dA