ViewPager with expandable child

Question

I\'m trying to create collapsable calendar.

I\'m using custom calendarView in ViewPager, so when expand/collapse button pressed my calendarView animate collapsing al

Answer 1

So finally i figured out how to resolve my problem, maybe it will be helpfull.

here is my PagerAdapter:

class CustomAdapter extends PagerAdapter {

    private View mCurrentView;

    ...

    // Saving current active item
    @Override
    public void setPrimaryItem(ViewGroup container, int position, Object object) {
        mCurrentView = (View) object;
    }

     public View getCurrentItem() {
        return mCurrentView;
    }

}

And this is my ViewPager class

class CustomViewPager extends ViewPager {

    private CustomViewPagerAdapter mAdapter;

    ...

    // Set ViewPager height to currentItem
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        int height = 0;
        View v = mAdapter.getCurrentItem();
        if(v != null) {
            v.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
            height = v.getMeasuredHeight();
        }

        heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);

        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }
}

With this i can collapse/expand ViewPager childs and it will be measure its height correctly, and it measures when page is changed with a little delay.