Disabling & Enabling Paging In ViewPager in Android

Question

I am using android compatibility package version 4 for displaying pdf pages in my app. I have used PagerAdapter & ViewPager for displaying pdf pages like horizontal scro

Answer 1

I was having a similar problem with paging image files that need pinch to zoom. Simply put Needing a way to disable paging when image is zoomed in and enable it when the whole image is shown. I solved it like this and think you could do a similar thing. First extend : class MyViewPager extends ViewPager {...} And then in that class override following two methods

    @Override
public boolean onTouchEvent(MotionEvent event) {
    if (YOUR_CRITERIA_TOENABLE_DISABLE) {
        return true;

    } else {
        return super.onTouchEvent(event);
    }
}

@Override
public boolean onInterceptTouchEvent(MotionEvent event) {
    return super.onInterceptTouchEvent(event);
}

Be sure to use your view pager in xml layouts or dynamic creation from code.

Answer 2

@Override
public boolean onTouchEvent(MotionEvent event) {
     if (this.enabled) {
           return super.onTouchEvent(event);
     }
     return false;
}

public void setPagingEnabled(boolean enabled) {
    this.enabled = enabled;
}

replace "return false" to "return this.enable" and set default value of this.enable to false

Answer 3

You're setting it to false but have no case for resetting it back to true. Also, your intercept touch logic seems a bit odd... the only time you allow the pager to intercept (and thereby process in onTouchEvent()) is when you set paging enabled to false. How about the following?

 @Override
    public boolean onInterceptTouchEvent(MotionEvent event) {
        boolean result = true;
        View scroll = getChildAt(childId);
        if (scroll != null) {
            Rect rect = new Rect();
            CommonLogic.logMessage("PDF Page Rectangle  ", TAG, Log.VERBOSE);
            scroll.getHitRect(rect);
            if (rect.contains((int) event.getX(), (int) event.getY())) {
                setPagingEnabled(false);
                result = false;
            } else {
                setPagingEnabled(true);
            }
        }
        return result;
    }