Android实现自动轮询的RecycleView

需求：类似医院或者商场，大屏幕无限轮播item (广告词/广告图…)，供大家参考，具体内容如下

代码如下

/**
 * Created by Xia_焱 on 2017/8/20.
 */

public class AutoPollRecyclerView extends RecyclerView {
 private static final long TIME_AUTO_POLL = 32;
 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);
 }
}

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中的代码如下

@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;
 }

Activity中的代码

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我们。