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…)

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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