Black Space When Flinging on ScrollView

[kwelsh]

I'm not sure if this is reported or not, but I'm noticing some black space between the bottom of the header and the top of the ScrollView when you fling. The device I'm on is The Note 5 and I'm compiling from Gradle like such compile 'com.github.carlonzo.stikkyheader:core:0.+'

The code I'm seeing this with is the example code for SimpleScrollViewFragment.java and fragment_simplescrollview.xml, unmodified.

Is this a known issue and are there any workarounds? There doesn't seem to be a HeaderStikkyAnimator with this code, so I'm guessing it's in the way we measure the bottom of the header or the top of the ScrollView perhaps?

[kwelsh]

I've noticed that giving a max_height_header of 700dp (or something substantially large) and attempting to fling creates a pause during the middle of the fling. Flinging doesn't seem to be smooth, so I'm wondering what we're doing that is preventing it from smoothly scrolling the view.

The measurement of the sticky header seems to not be calculated as accurately while in the middle of flinging. Flinging makes the header appear to "bounce", as the top and bottom of the header adjust to the resizing of the layouts.

Where is the layout of the header measured when flinging occurs?

[luciovicentini]

Same behaviour is happening to me.

I made the scrollview parent (RelativeLayout) and the scrollview have the same background color as a workaround, but It would be nice to have a proper solution to this issue.

Thanks in advance.

[juanvimartinez]

I found a workaround for this issue.
In the BaseStickyHeaderAnimator.java file I added the following changes:

@Override
public void onScroll(int scrolledY) {
    StikkyCompat.setTranslationY(mHeader, Math.max(scrolledY, getMaxTranslation()));
    mTranslationRatio = calculateTranslationRatio(scrolledY - 0.01f);
}

private float calculateTranslationRatio(float scrolledY) {
        //TODO check divisor != 0
    return scrolledY / (float) getMaxTranslation();
}

With these changes, the blank space when flinging disappears after a small "jump".