Recyclerview添加头布局和尾布局、item点击事件详解

简介：

本篇博客主要包括recyclerview添加多种布局以及添加头布局和尾布局，还有item点击事件

思路：

主要重写recyclerview.adapter中的一些方法

　　1.public int getitemcount()  item熟练  +2(头布局和尾布局)

　　2.public int getitemviewtype(int position)   判断position 设置itemtype

　　3.创建不同的viewholder,分别用来加载头布局，正常布局，尾布局

　　4.public recyclerview.viewholder oncreateviewholder(viewgroup parent, int viewtype)  根据viewtype的不同返回不同的viewholder

　　5.public void onbindviewholder(recyclerview.viewholder holder, int position)  根据holder的不同绑定不同的数据 

案例：

主布局中只有一个recyclerview,里面的item除了基本的两种类型，还有头布局和尾布局，点击基本类型跳转到另外一个activity，显示图片

下面主要贴出adapter和mainactivity中的代码，其他的布局文件，类比较简单就不贴出了

1.adapter

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);
 }
}　

2.mainactivity

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);
 }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。