Android Implementation of Automatic Polling RecycleView
- 2021-11-13 18:05:19
- OfStack
Requirements: Similar to hospitals or shopping malls, item (advertising words/advertising pictures …) is broadcast on the big screen for your reference. The specific contents are as follows
The code is as follows
/**
* Created by Xia_ Yan on 2017/8/20.
*/
public class AutoPollRecyclerView extends RecyclerView {
private static final long TIME_AUTO_POLL = 32;
AutoPollTask autoPollTask;
private boolean running; // Indicates whether automatic polling is in progress
private boolean canRun;// Indicate whether automatic polling is available , Can be set in whether you don't need it or not 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;
// Holding External Class References with Weak References -> Prevent memory leaks
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);
}
}
}
// Open : If you are running , Stop first -> Re-open
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);
}
}
Open: If it is running, stop first- > Re-open
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);
}
}
The code in Adapter is as follows
@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;
}
Code in Activity
mRecyclerView.setAdapter(adapter);
if (true) // Guarantee itemCount The total number width of exceeds the screen width -> Handle by oneself
mRecyclerView.start();