Dynamically set ViewPager height

Question

I am trying to put a ViewPager with different fragments with different heights. I know that wrap_content is not working with ViewPager so I am trying to set pager height dinamically. I am setting the pager height in a page listener:

...
        indicator.setOnPageChangeListener(new OnPageChangeListener() {

            @Override
            public void onPageSelected(int selected) {
                final View view = fragments[selected].getView();
                if (view != null) {
                    pager.setLayoutParams(new LayoutParams(
                            LayoutParams.MATCH_PARENT, view
                                    .getMeasuredHeight()));

                }

            }

Unfortunately it is not working because the value returned by getMeasuredHeight() on Fragment is wrong. What am I doing wrong?

score 18 · Accepted Answer · answered Oct 21 '13 at 22:12

18

This is my solution:

    ViewTreeObserver viewTreeObserver = mViewPager.getViewTreeObserver();
    viewTreeObserver
            .addOnGlobalLayoutListener(new OnGlobalLayoutListener() {

                @Override
                public void onGlobalLayout() {

                    LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
                            LinearLayout.LayoutParams.WRAP_CONTENT,
                            LinearLayout.LayoutParams.WRAP_CONTENT);

                    int viewPagerWidth = mViewPager.getWidth();
                    float viewPagerHeight = (float) (viewPagerWidth * FEATURED_IMAGE_RATIO);

                    layoutParams.width = viewPagerWidth;
                    layoutParams.height = (int) viewPagerHeight;

                    mViewPager.setLayoutParams(layoutParams);
                    mViewPager.getViewTreeObserver()
                            .removeGlobalOnLayoutListener(this);
                }
            });

I call it in onResume();

answered Oct 21 '13 at 22:12

czaku

829
9
20

But OnGlobalLayoutListener is not called. Why? – Bagusflyer Mar 25 '14 at 03:02
Are you sure? Did you log it and made sure it is not? – czaku Apr 16 '14 at 14:32
5

What is the FEATURED_IMAGE_RATIO?? I'am trying to use it on a fragmentpageradapter – Ibrahim Yildirim Jul 18 '14 at 17:35
My ViewPager displays just the image. I know image ratios upfront so FEATURED_IMAGE_RATIO is just a constant value to calculate the height of the ViewPager. – czaku Jul 20 '14 at 08:51
@czaku I have a similar problem but a bit different, kindly check from http://stackoverflow.com/q/38342500/2595059 – George Jul 13 '16 at 12:22

score 1 · Answer 2 · answered Nov 16 '12 at 15:21

1

Try to set its parameters in onLayout() of the viewpager

answered Nov 16 '12 at 15:21

Ercan

3,705
1
22
37

so are you suggesting to extend the viewPager? The problem is that the pager should have the height of the displayed fragment, so I don't understand how this could be solved in onLayout(). – Matroska Nov 16 '12 at 15:31

Dynamically set ViewPager height

2 Answers2

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