Android中怎么利用RecycleView添加head配置
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实例代码:
package com.wwl.android; import android.support.v7.widget.GridLayoutManager; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.StaggeredGridLayoutManager; import android.view.View; import android.view.ViewGroup; import java.util.ArrayList; public abstract class BaseRecyclerAdapterextends RecyclerView.Adapter { public static final int TYPE_HEADER = 0; public static final int TYPE_NORMAL = 1; private ArrayList mDatas = new ArrayList<>(); private View mHeaderView; private OnItemClickListener mListener; public void setOnItemClickListener(OnItemClickListener li) { mListener = li; } public void setHeaderView(View headerView) { mHeaderView = headerView; notifyItemInserted(0); } public View getHeaderView() { return mHeaderView; } public void addDatas(ArrayList datas) { mDatas.addAll(datas); notifyDataSetChanged(); } @Override public int getItemViewType(int position) { if(mHeaderView == null) return TYPE_NORMAL; if(position == 0) return TYPE_HEADER; return TYPE_NORMAL; } @Override public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, final int viewType) { if(mHeaderView != null && viewType == TYPE_HEADER) return new Holder(mHeaderView); return onCreate(parent, viewType); } @Override public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) { if(getItemViewType(position) == TYPE_HEADER) return; final int pos = getRealPosition(viewHolder); final T data = mDatas.get(pos); onBind(viewHolder, pos, data); if(mListener != null) { viewHolder.itemView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mListener.onItemClick(pos, data); } }); } } @Override public void onAttachedToRecyclerView(RecyclerView recyclerView) { super.onAttachedToRecyclerView(recyclerView); RecyclerView.LayoutManager manager = recyclerView.getLayoutManager(); if(manager instanceof GridLayoutManager) { final GridLayoutManager gridManager = ((GridLayoutManager) manager); gridManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() { @Override public int getSpanSize(int position) { return getItemViewType(position) == TYPE_HEADER ? gridManager.getSpanCount() : 1; } }); } } @Override public void onViewAttachedToWindow(RecyclerView.ViewHolder holder) { super.onViewAttachedToWindow(holder); ViewGroup.LayoutParams lp = holder.itemView.getLayoutParams(); if(lp != null && lp instanceof StaggeredGridLayoutManager.LayoutParams && holder.getLayoutPosition() == 0) { StaggeredGridLayoutManager.LayoutParams p = (StaggeredGridLayoutManager.LayoutParams) lp; p.setFullSpan(true); } } public int getRealPosition(RecyclerView.ViewHolder holder) { int position = holder.getLayoutPosition(); return mHeaderView == null ? position : position - 1; } @Override public int getItemCount() { return mHeaderView == null ? mDatas.size() : mDatas.size() + 1; } public abstract RecyclerView.ViewHolder onCreate(ViewGroup parent, final int viewType); public abstract void onBind(RecyclerView.ViewHolder viewHolder, int RealPosition, T data); public class Holder extends RecyclerView.ViewHolder { public Holder(View itemView) { super(itemView); } } public interface OnItemClickListener { void onItemClick(int position, T data); } }
然后在外面自己的适配器中直接继承就可以了
package com.wwl.android; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; /** * wwl */ public class MyAdapter extends BaseRecyclerAdapter{ @Override public RecyclerView.ViewHolder onCreate(ViewGroup parent, int viewType) { View layout = LayoutInflater.from(parent.getContext()).inflate(R.layout.item, parent, false); return new MyHolder(layout); } @Override public void onBind(RecyclerView.ViewHolder viewHolder, int RealPosition, String data) { if(viewHolder instanceof MyHolder) { ((MyHolder) viewHolder).text.setText(data); } } class MyHolder extends BaseRecyclerAdapter.Holder { TextView text; public MyHolder(View itemView) { super(itemView); text = (TextView) itemView.findViewById(R.id.text); } } }
然后在类中调用,
public class MainActivity extends AppCompatActivity { private RecyclerView mRecyclerView; private RecyclerView.LayoutManager mLayoutManager; private MyAdapter mAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mRecyclerView = (RecyclerView) findViewById(R.id.list); // mLayoutManager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false); mLayoutManager = new GridLayoutManager(this, 2); // mLayoutManager = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL); mRecyclerView.setLayoutManager(mLayoutManager); mRecyclerView.setItemAnimator(new DefaultItemAnimator()); mRecyclerView.addItemDecoration(new GridItemDecoration(this, true)); mAdapter = new MyAdapter(); mRecyclerView.setAdapter(mAdapter); mAdapter.addDatas(generateData()); setHeader(mRecyclerView); mAdapter.setOnItemClickListener(new BaseRecyclerAdapter.OnItemClickListener() { @Override public void onItemClick(int position, String data) { Toast.makeText(MainActivity.this, position + "," + data, Toast.LENGTH_SHORT).show(); } }); } private void setHeader(RecyclerView view) { View header = LayoutInflater.from(this).inflate(R.layout.header, view, false); mAdapter.setHeaderView(header); } private ArrayList generateData() { ArrayList data = new ArrayList () { { for(int i=0;i<21;i++) add("数据" + i); } }; return data; } }
这样就OK啦。
布局文件:
R.layout.activity_main
header.xml
item.xml
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