Android RecyclerView打造自动循环效果

先看效果图

主要处理的地方:
1、recyclerview中adapter的item个人可以无限轮询.
2、recyclerview自动滑动
3、手指按下时滑动停止,手指抬起后继续自动滑动

public class autopollrecyclerview extends recyclerview {
 private static final long time_auto_poll = 16;
 autopolltask autopolltask;
 private boolean running; //标示是否正在自动轮询
 private boolean canrun;//标示是否可以自动轮询,可在不需要的是否置false
 public autopollrecyclerview(context context, @nullable attributeset attrs) {
  super(context, attrs);
  autopolltask = new autopolltask(this);
 }
 static class autopolltask implements runnable {
  private final weakreference<autopollrecyclerview> mreference;
  //使用弱引用持有外部类引用->防止内存泄漏
  public autopolltask(autopollrecyclerview reference) {
   this.mreference = new weakreference<autopollrecyclerview>(reference);
  }
  @override
  public void run() {
   autopollrecyclerview recyclerview = mreference.get();
   if (recyclerview != null && recyclerview.running &&recyclerview.canrun) {
    recyclerview.scrollby(2, 2);
    recyclerview.postdelayed(recyclerview.autopolltask,recyclerview.time_auto_poll);
   }
  }
 }
 //开启:如果正在运行,先停止->再开启
 public void start() {
  if (running)
   stop();
  canrun = true;
  running = true;
  postdelayed(autopolltask,time_auto_poll);
 }
 public void stop(){
  running = false;
  removecallbacks(autopolltask);
 }
 @override
 public boolean ontouchevent(motionevent e) {
  switch (e.getaction()){
   case motionevent.action_down:
    if (running)
     stop();
    break;
   case motionevent.action_up:
   case motionevent.action_cancel:
   case motionevent.action_outside:
    if (canrun)
     start();
    break;
  }
  return super.ontouchevent(e);
 }
}

adapter处理:主要处理getitemcount()和数据填充的onbindviewholder()方法

public class autopolladapter extends recyclerview.adapter<baseviewholder> {
 private final context mcontext;
 private final list<string> mdata;
 public autopolladapter(context context, list<string> list) {
  this.mcontext = context;
  this.mdata = list;
 }
 @override
 public baseviewholder oncreateviewholder(viewgroup parent, int viewtype) {
  view view = layoutinflater.from(mcontext).inflate(r.layout.item_auto_poll, parent, false);
  baseviewholder holder = new baseviewholder(view);
  return holder;
 }
 @override
 public void onbindviewholder(baseviewholder holder, int position) {
  string data = mdata.get(position%mdata.size());
  holder.settext(r.id.tv_content,data);
 }
 @override
 public int getitemcount() {
  return integer.max_value;
 }
}

最后附上activity调用的代码

public class autopollrecycleractivity extends baseactivity {
 @override
 protected void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_auto_poll);
  inittoolbar();
  initview();
 }
 private void initview() {
  autopollrecyclerview mrecyclerview = (autopollrecyclerview) findviewbyid(r.id.rv_recycleview);
  list<string> list = new arraylist<>();
  for (int i = 0; i < 5; ) {
   list.add(" item: " + ++i);
  }
  autopolladapter adapter = new autopolladapter(this, list);
  mrecyclerview.setlayoutmanager(new linearlayoutmanager(this, linearlayoutmanager.horizontal, false));
  mrecyclerview.additemdecoration(new divideritemdecoration(this, divideritemdecoration.horizontal_list));
  mrecyclerview.setadapter(adapter);
  if (true) //保证itemcount的总个数宽度超过屏幕宽度->自己处理
   mrecyclerview.start();
 }
}

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。