Recyclerview添加头布局和尾布局、item点击事件详解

public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> implements View.OnClickListener { private Context context; private List<Person> datas; private static final int ITEM_ONE=1; private static final int ITEM_TWO=2; private static final int ITEM_HEAD=3; private static final int ITEM_FOOT=4; private int headViewCount=1; private int footViewCount=1; private OnItemClickListener onItemClickListener; public MyAdapter(Context context, List<Person> datas) {  this.context = context;  this.datas = datas; } @Override public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {  if(viewType==ITEM_HEAD){   View view= LayoutInflater.from(context).inflate(R.layout.item_head,parent,false);   return new HeaderViewHolder(view);  }else if(viewType==ITEM_FOOT){   View view=LayoutInflater.from(context).inflate(R.layout.item_foot,parent,false);   return new FootViewHolder(view);  }  else if(viewType==ITEM_ONE){   View view= LayoutInflater.from(context).inflate(R.layout.item_recyclerview,parent,false);   return new ViewHolder(view);  }else if(viewType==ITEM_TWO){   View view=LayoutInflater.from(context).inflate(R.layout.item_recyclerview2,parent,false);   return new ViewHolder(view);  }  return null; } @Override public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {  if(holder instanceof HeaderViewHolder){  }else if(holder instanceof FootViewHolder){  }  else if(holder instanceof ViewHolder){   //注意除去头布局   holder.itemView.setTag(position-1);   holder.itemView.setOnClickListener(this);   ((ViewHolder)holder).img.setBackgroundResource(datas.get(position-1).getImgId());   ((ViewHolder)holder).tv1.setText(datas.get(position-1).getName());   ((ViewHolder)holder).tv2.setText(datas.get(position-1).getDetail());  } } @Override public int getItemCount() {  if(datas==null){   return headViewCount+footViewCount;  }  return datas.size()+headViewCount+footViewCount; } @Override public int getItemViewType(int position) {  if(isHeadView(position)){   return ITEM_HEAD;  }  if(isFootView(position)){   return ITEM_FOOT;  }  if(position%2==0){   return ITEM_ONE;  }else{   return ITEM_TWO;  } } public boolean isHeadView(int position){  return headViewCount!=0&&position<headViewCount; } public boolean isFootView(int position){  return footViewCount!=0&&position>=(datas.size()+headViewCount); } @Override public void onClick(View view) {  if(onItemClickListener!=null){   onItemClickListener.onItemClick(view, (Integer) view.getTag());  } } class ViewHolder extends RecyclerView.ViewHolder{   TextView tv1,tv2;   ImageView img;  public ViewHolder(View itemView) {   super(itemView);   tv1=itemView.findViewById(R.id.tv1);   tv2=itemView.findViewById(R.id.tv2);   img=itemView.findViewById(R.id.img);  } } class HeaderViewHolder extends RecyclerView.ViewHolder{  public HeaderViewHolder(View itemView) {   super(itemView);  } } class FootViewHolder extends RecyclerView.ViewHolder{  public FootViewHolder(View itemView) {   super(itemView);  } } public void setOnItemClickListener(OnItemClickListener onItemClickListener){  this.onItemClickListener=onItemClickListener; } interface OnItemClickListener{  void onItemClick(View view,int position); }}　

public class MainActivity extends AppCompatActivity implements MyAdapter.OnItemClickListener { private RecyclerView recyclerView; private List<Person> datas; private MyAdapter adapter;  private int[] imgs={R.drawable.p1,R.drawable.p2,R.drawable.p3,R.drawable.p4,R.drawable.p5,R.drawable.pic1,   R.drawable.pic2,R.drawable.pic3,R.drawable.pic4,R.drawable.pic5,R.drawable.pic6}; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  recyclerView= (RecyclerView) findViewById(R.id.recyclerview);  initData();  initRecyclerView(); } private void initRecyclerView() {  recyclerView.setLayoutManager(new LinearLayoutManager(this));  adapter=new MyAdapter(this,datas);  adapter.setOnItemClickListener(this);  recyclerView.setAdapter(adapter); } private void initData() {  datas=new ArrayList<>();  for(int i=0;i<imgs.length;i++){   Person p=new Person();   p.setName("hahfa"+i);   p.setDetail("今天是星期一，还有5天才能休息"+i);   p.setImgId(imgs[i]);   datas.add(p);  } } @Override public void onItemClick(View view, int position) {  Intent intent=new Intent(MainActivity.this,ImageActivity.class);  intent.putExtra("imgId",datas.get(position).getImgId());  startActivity(intent); }}