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();
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本文标题: Android实现自动轮询的RecycleView
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