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; } @Override public 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); } @Override public void onBindViewHolder(final ViewHolder holder, final int position) { if (isHeader(position)) { return; } final String label = labels.get(position - 1); // Subtract 1 for header holder.textView.setText(label); } @Override public int getItemViewType(int position) { return isHeader(position) ? ITEM_VIEW_TYPE_HEADER : ITEM_VIEW_TYPE_ITEM; } @Override public 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); } @Override public void onClick(View v) { // TODO Auto-generated method stub onItemClickLitener.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() { @Override public void onItemClick(View view, int position) { // TODO Auto-generated method stub if(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() { @Override public 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