Android实现自动轮询的RecycleView

作者: 用户35175328
来源: 51数据库
2020-08-19

这篇文章主要为大家详细介绍了Android实现自动轮询的RecycleView，文中示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下

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，