ViewPager detect when user is trying to swipe out of bounds

Question

I am using the ViewPager consisting of 6 pages to display some data. I want to be able to call a method when the user is at position 0 and tries to swipe to the right (backw

Answer 1

I wonder how it worked for others, it's not working for me.

onInterceptTouchEvent() only takes ACTION_DOWN event. While onTouchEvent() only takes one event at a time either ACTION_DOWN, ACTION_UP and others.

I had to override both onInterceptTouchEvent() and onTouchEvent() to make it work properly. The ACTION_DOWN of onInterceptTouchEvent grabs initial X point of touch, and OnTouchEvent grabs final X2 point. Which I compared it to detect swipe direction.

Get initial X value of the touch:

float x1 = 0;
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
        switch(ev.getAction() & MotionEventCompat.ACTION_MASK){
        case MotionEvent.ACTION_DOWN:
            x1 = ev.getX();
            break;
        }
        return super.onInterceptTouchEvent(ev);
    }

From tjlian616's code, the onTouchEvent() listens to ACTION_UP and gets it's last X Value. While I've set my current item's value to be 0 to get swipe out at start listener. Compared it and add fired up the listener.

 @Override
 public boolean onTouchEvent(MotionEvent ev){
        if(getCurrentItem()==0){
            final int action = ev.getAction();
            switch(action & MotionEventCompat.ACTION_MASK){
            case MotionEvent.ACTION_MOVE:
                break;
            case MotionEvent.ACTION_UP:
                mStartDragX = ev.getX();
                if (x1