Dynamic height viewpager

Question

I\'m trying to create a custom viewpager inside custom scroll viewthat dynamically wraps the current child\'s height.

package com.example.vihaan.dynamicviewp         


        

Answer 1

Made a few tweaks in your code and it is working fine now.

1] onMeasure function wasn't proper. Use below logic

@Override
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    if (mCurrentView == null) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        return;
    }
    int height = 0;
    mCurrentView.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
    int h = mCurrentView.getMeasuredHeight();
    if (h > height) height = h;
    heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);

    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}

2] ViewPager needs to be re-measured each time a page is changed. Good place to do this is setPrimaryItem function of PagerAdapter

@Override
    public void setPrimaryItem(ViewGroup container, int position, Object object) {
        super.setPrimaryItem(container, position, object);
        if (position != mCurrentPosition) {
            Fragment fragment = (Fragment) object;
            CustomPager pager = (CustomPager) container;
            if (fragment != null && fragment.getView() != null) {
                mCurrentPosition = position;
                pager.measureCurrentView(fragment.getView());
            }
        }
    }

Here is the link to GitHub project with these tweaks: https://github.com/vabhishek/WrapContentViewPagerDemo