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

代码语言：javascript复制

/**
 * 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

代码语言：javascript复制

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

代码语言：javascript复制

@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

代码语言：javascript复制

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。

adapter

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