需求:類似醫院或者商場,大屏幕無限輪播item (廣告詞/廣告圖…)
代碼如下
/**
* 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; //標示是否正在自動輪詢
private boolean canRun;//標示是否可以自動輪詢,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類引用->防止內存泄漏
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);
}
}
}
//開啓:如果正在運行,先停止->再開啓
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);
}
}
開啓:如果正在運行,先停止->再開啓
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中的代碼如下
@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中的代碼
mRecyclerView.setAdapter(adapter);
if (true) //保證itemCount的總個數寬度超過屏幕寬度->自己處理
mRecyclerView.start();