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在项目的build.gradle添加依赖
compile 'com.android.support:recyclerview-v7:23.4.0'
recyclerview.setadapter(); 添加适配器(必须)
recyclerview.setlayoutmanager(); 选择一种布局(必须)
recycleradapter.setheaderview(); 添加头布局
recycleradapter.setfooterview(); 添加底部布局
recyclerview.setitemanimator(new defaultitemanimator()); 添加默认动画
recyclerview.additemdecoration(); 添加分割线
new linearlayoutmanager(this, linearlayoutmanager.vertical, false) 以垂直或者水平列表方式展示item，第三个参数是否颠倒数据显示
new gridlayoutmanager(this,4) 以网格方式展示item，第二个参数代表列数
new staggeredgridlayoutmanager(4, staggeredgridlayoutmanager.horizontal) 以瀑布流方式展示item，第一个参数代表列数
canscrollhorizontally();//能否横向滚动 canscrollvertically();//能否纵向滚动 scrolltoposition(int position);//滚动到指定位置 setorientation(int orientation);//设置滚动的方向 getorientation();//获取滚动方向 findviewbyposition(int position);//获取指定位置的item view findfirstcompletelyvisibleitemposition();//获取第一个完全可见的item位置 findfirstvisibleitemposition();//获取第一个可见item的位置 findlastcompletelyvisibleitemposition();//获取最后一个完全可见的item位置 findlastvisibleitemposition();//获取最后一个可见item的位置
recyclerview必须自定义适配器，并且自己创建事件监听，布局和数据的绑定顺序，每个item都会执行一遍：getiitemviewtype(绑定类型) > oncreateviewholder(选择布局类型) > onbindviewholder(绑定数据)
notifyiteminserted(position);插入一个item
notifyitemremoved(position); 移除一个item
notifyitemchanged(position) 刷新item
我要评论public class datarecycleradapter extends recyclerview.adapter<datarecycleradapter.myviewholder>{
private list<string> list;
private context context;
private list<integer> mheights;
private static int type_title=0;
private static int type_footer=1;
private static int type_content =2;
private view mheaderview;
private view mfooterview;
public datarecycleradapter(context context, list<string> list) {
this.list=list;
mheights = new arraylist<>();
this.context=context;
}
//根据不同的类型适应不用的布局
@override
public myviewholder oncreateviewholder(viewgroup parent, int viewtype) {
if(mheaderview != null && viewtype == type_title) {
return new myviewholder(mheaderview);
}
if(mfooterview != null && viewtype == type_footer) {
return new myviewholder(mfooterview);
}
return new myviewholder(layoutinflater.from(context).inflate(r.layout.options_item3,parent,false));
}
//给item分布不同的类型
@override
public int getitemviewtype(int position) {
if (position == 0){
return type_title;
}else if(position==list.size()){
return type_footer;
}else{
return type_content;
}
}
public view getheaderview() {
return mheaderview;
}
//添加自定义的头部
public void setheaderview(view headerview) {
mheaderview = headerview;
notifyiteminserted(0);
}
public view getfooterview() {
return mfooterview;
}
//添加自定义底部
public void setfooterview(view footerview) {
mfooterview = footerview;
notifyiteminserted(list.size()+1);
}
//主体布局
@override
public void onbindviewholder(final myviewholder holder, int position) {
if(getitemviewtype(position) != type_content) {
return;
}
holder.textview.settext(list.get(position-1));
if (monitemclicklitener != null){
holder.itemview.setonclicklistener(new view.onclicklistener(){
@override
public void onclick(view v){
int pos = holder.getlayoutposition();
monitemclicklitener.onitemclick(holder.itemview, pos);
}
});
holder.itemview.setonlongclicklistener(new view.onlongclicklistener(){
@override
public boolean onlongclick(view v){
int pos = holder.getlayoutposition();
monitemclicklitener.onitemlongclick(holder.itemview, pos);
return true;
}
});
}
}
//获取item总数
@override
public int getitemcount() {
if(mfooterview !=null){
return list.size()+1;
}else {
return list.size();
}
}
//监听器接口
public interface onitemclicklitener{
void onitemclick(view view, int position);
void onitemlongclick(view view , int position);
}
private onitemclicklitener monitemclicklitener;
public void setonmyitemclicklitener(onitemclicklitener monitemclicklitener) {
this.monitemclicklitener = monitemclicklitener;
}
//头和底部的布局
class myviewholder extends recyclerview.viewholder {
private textview textview;
myviewholder(view itemview) {
super(itemview);
if (itemview == mheaderview||itemview == mfooterview){
return;
}
textview= (textview) itemview.findviewbyid(r.id.options_tv);
textview.settext("uuu");
}
}
//模拟新增的数据
public void adddata(int position) {
list.add(position, "insert 数据");
notifyiteminserted(position+1);
toast.maketext(context,""+list.size(),toast.length_short).show();
}
//移除一个布局
public void removedata(int position) {
list.remove(position);
notifyitemremoved(position);
}
private void initdatarecycleradapter(){
recycleradapter=new datarecycleradapter(this,mdata);
//布局管理器
recyclerview.setlayoutmanager( new linearlayoutmanager(this, linearlayoutmanager.vertical, false));
//分割线
recyclerview.additemdecoration(new divideritemdecoration(this,
divideritemdecoration.horizontal));
//使用默认动画
recyclerview.setitemanimator(new defaultitemanimator());
//不使用默认的布局类型，添加自定义头部布局
recycleradapter.setheaderview(layoutinflater.from(this).inflate(r.layout.options_title, recyclerview, false));
//不使用默认的布局类型，添加自定义底部布局
layoutinflater inflater= layoutinflater.from(this);
view footerview = inflater.inflate(r.layout.options_footer, null);
recycleradapter.setfooterview(footerview);
//底部布局事件，增加一个item
footerview.setonclicklistener(new view.onclicklistener() {
@override
public void onclick(view view) {
toast.maketext(mainactivity.this,"展开",toast.length_short).show();
recycleradapter.adddata(mdata.size());
}
});
recyclerview.setadapter(recycleradapter);
recycleradapter.setonmyitemclicklitener(new datarecycleradapter.onitemclicklitener() {
//item的点击事件，移除一个item
@override
public void onitemclick(view view, int position) {
recycleradapter.removedata(position);
toast.maketext(mainactivity.this,""+mdata.size(),toast.length_short).show();
}
//item的长按事件，显示item下标
@override
public void onitemlongclick(view view, int position) {
toast.maketext(mainactivity.this,"第"+position+"个",toast.length_short).show();
}
});
}
//模拟数据源
private void adddata(){
mdata= new arraylist<>();
for (int i=1;i<20;i++) {
mdata.add("数据"+i+"个");
}
}
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