android - One side ViewPager swiping only

Question

I have a ViewPager in my application and I would like to disable/allow swipe to right side in any time. Every view in the viewpager contains ListView. How can I do that? I am trying to do that in this way:

private int oldX;
private int deltaX = 0;

@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
    if (motionEvent.getAction() == MotionEvent.ACTION_MOVE || motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
        int newX = (int) motionEvent.getX();
        deltaX = oldX - newX;
        oldX = newX;
    }
    if (motionEvent.getAction() == MotionEvent.ACTION_UP) {
        oldX = 0;
    }
    return deltaX < 0;        
}

But view is still going to right side a little bit. Anyone was solving the same issue?

Answer 1

I was able to achieve one-side scrolling in ViewPager by taking its code to my application and adding the following

private boolean performDrag(float x) {
    boolean needsInvalidate = false;

    final float deltaX = mLastMotionX - x;
    mLastMotionX = x;

    // MY CODE STARTS
    if (deltaX < 0) {
        return false;
    }
    // MY CODE ENDS

    float oldScrollX = getScrollX();
    ...

It seems to work fine. The only thing You might need - take adapter code or provide Your own adapter, because some methods ViewPager uses in its code are not public from PagerAdapter.