Android viewpager detect swipe beyond the bounds

Question

In my Android application, I am using a viewpager for image swiping. My requirement is, if a user swipes out of the first and last page, the activity should finish.

I ha

Answer 1

I changed M.A.Murali's code:

public class CheckBoundsPager extends ViewPager {
    public CheckBoundsPager(Context context) {
        super(context);
    }

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

    }

    OnSwipeOutListener mListener;

    public void setOnSwipeOutListener(OnSwipeOutListener listener) {
        mListener = listener;
    }

    private float mStartDragX;
    private float mStartDragY;
    private float MIN_MOVE=50; //minimal movement in px - change it to you value


    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        float x = ev.getX();
        float y = ev.getY();
        switch (ev.getAction()) {
            case MotionEvent.ACTION_DOWN: {
                //here we set x and y on user start drag
                mStartDragX = x;
                mStartDragY = y;

                }
                break;
            case MotionEvent.ACTION_MOVE: {

                //most important to check if x drag is more than y
                float xDiff=Math.abs(mStartDragX-x);
                float yDiff=Math.abs(mStartDragY-y);

                //added condition if swipe y is less than x
                if (mStartDragX < x-MIN_MOVE && xDiff>yDiff &&  getCurrentItem() == 0) {
                    mListener.onSwipeOutAtStart();
                } else if (mStartDragX > x+MIN_MOVE
                        && xDiff>yDiff && getCurrentItem() == getAdapter().getCount() - 1) {
                    mListener.onSwipeOutAtEnd();
                }
                }
                break;
        }
        return super.onInterceptTouchEvent(ev);
    }

    public interface OnSwipeOutListener {

        public void onSwipeOutAtStart();

        public void onSwipeOutAtEnd();
    }
}

This solutions checks if we drag left or right and our drag's movement is in the x-axis. Remember to change MIN_MOVE.