Extended ScrollView onScrollEnded Loading multiple entries from Database but i only need that one time per End

Question

I know why my Extended ScrollViews onScrollChanged is being called multiple times when end is reached with onScrollEnd (Its because I "reach end" multiple times with scrolling and thus calling onScrollEnd multiple times) and because of that its Loading multiple entries from Database while I want it to Load them once when first end is reached.

in my ExtendedScrollView class i have

protected void onScrollChanged(int x, int y, int oldx, int oldy) {

View view = (View) getChildAt(getChildCount() - 1);
int diff = (view.getBottom()-(getHeight()+getScrollY()+view.getTop()));

if (diff == 0) { 

      if (scrollViewListener != null) {

          scrollViewListener.onScrollEnded(this, x, y, oldx, oldy);

      }

  }

   super.onScrollChanged(x, y, oldx, oldy);
}

with

public interface ScrollViewListener {

   void onScrollEnded(ExtendedScrollView scrollView, int x, int y, int oldx, int oldy);
}

In my Activity I have

@Override
    public void onScrollEnded(ExtendedScrollView scrollView, int x, int y, int oldx, int oldy) {

   //Called multiple times because of scroll but needed only once 

  //read 6 Strings (for example) from Database and refresh Tableview with that data (working so I think there is no need for the code)

}

So is there a way to stop getting multiple "ends" (caused by scrolling). Only to get the OnScrollEnded Once and load only 6 Strings from DB (Because of scrolling its called multiple times), then on the next 12 Scroll read next 6 and so on...

Any help is appreciated.

Answer 1

I found a way Combined couple of code I found here at StackOverflow and got

ExtendedViewClass

public class ExtendedScrollView extends ScrollView {

private Runnable scrollerTask;
private int initialPosition;

private int newCheck = 100;


public interface OnScrollStoppedListener{
void onScrollStopped();
}

private OnScrollStoppedListener onScrollStoppedListener;

public ExtendedScrollView(Context context, AttributeSet attrs) {
super(context, attrs);

scrollerTask = new Runnable() {

    public void run() {

        int newPosition = getScrollY();

        View view = (View) getChildAt(getChildCount() - 1);
        int diff = (view.getBottom()-(getHeight()+getScrollY()+view.getTop()));

        if(initialPosition - newPosition == 0 && diff == 0){//has stopped and reached end

            if(onScrollStoppedListener!=null){

                onScrollStoppedListener.onScrollStopped();
            }
        }
    }
 };
}

public void setOnScrollStoppedListener(ExtendedScrollView.OnScrollStoppedListener listener){
onScrollStoppedListener = listener;
 }

public void startScrollerTask(){

initialPosition = getScrollY();
ExtendedScrollView.this.postDelayed(scrollerTask, newCheck);
  }
}

And then in my Activity

scrollView = (ExtendedScrollView) findViewById(R.id.ScrView);


scrollView.setOnTouchListener(new OnTouchListener() {

    public boolean onTouch(View v, MotionEvent event) {

        if (event.getAction() == MotionEvent.ACTION_UP) {


            scrollView.startScrollerTask();
        }

        return false;
    }
});
scrollView.setOnScrollStoppedListener(new OnScrollStoppedListener() {

    public void onScrollStopped() {

        //code here

    }
});

This checks if its end of scroll and if Scroll stops then it run OnScrollStopped thus running it only once (not many times as I had the problem before).