import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;

public class SwipeOutViewPager extends ViewPager {

    private float mVelocityX;

    private OnSwipeOutListener mSwipeOutListener;

    public SwipeOutViewPager(Context context) {
        super(context);
    }

    public SwipeOutViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

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

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        if (ev.getAction() == MotionEvent.ACTION_DOWN) {
            mVelocityX = ev.getX();
        }
        return super.onInterceptTouchEvent(ev);
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        if (mSwipeOutListener != null) {
            int last = getAdapter().getCount() - 1;
            boolean lastItem = getCurrentItem() == last;
            boolean firstItem = getCurrentItem() == 0;

            if (firstItem || lastItem) {
                float x = ev.getX();

                switch (ev.getAction()) {
                    case MotionEvent.ACTION_MOVE:
                        break;
                    case MotionEvent.ACTION_UP:
                        if (firstItem && x > mVelocityX) {
                            //swipe out at start
                            mSwipeOutListener.onSwipeOut(false);
                        } else if (lastItem && x < mVelocityX) {
                            //swipe out at end
                            mSwipeOutListener.onSwipeOut(true);
                        }
                        break;
                }
            } else {
                mVelocityX = 0;
            }
        }
        return super.onTouchEvent(ev);
    }

    public interface OnSwipeOutListener {

        void onSwipeOut(boolean end);

    }
}