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POView SetVisibility not working with PagerAdapter
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copied!<p><strong>EDIT:</strong> After more investigation, it turns out that this has nothing to do with the <code>ViewPager</code>. The issue is with setting a visibility attribute on a <code>ViewGroup</code> in XML, then attempting to change it at runtime. I'm leaving the original question as it is. See my answer <a href="https://stackoverflow.com/a/18108336/1139908">below</a> for more information.</p> <p>I have a layout with a <code>ViewPager</code> and a custom <code>PagerIndicator</code> class. On the 0th page of the <code>ViewPager</code>, I want the indicator to be <code>View.GONE</code>. On other pages, I want it to be <code>View.VISIBLE</code>. Here's my code, which is called during <code>onCreate</code>:</p> <pre><code>void setupPager() { mPager.setAdapter(new TutorialPagerAdapter()); mPager.setOnPageChangeListener(new OnPageChangeListener() { @Override public void onPageSelected(int currentPage) { Log.d(TAG, String.valueOf(currentPage)); if (currentPage == 0) { mPagerIndicator.setVisibility(View.GONE); } else { mPagerIndicator.setVisibility(View.VISIBLE); } mPagerIndicator.setCurrentPage(currentPage); } @Override public void onPageScrolled(int arg0, float arg1, int arg2) { } @Override public void onPageScrollStateChanged(int arg0) { } }); } </code></pre> <p>The <code>mPagerIndicator</code> is set with <code>android:visibility="invisible"</code> in the XML layout. When I scroll between pages, I can see that the callback is being called, and the page number is correct. However, the pager doesn't appear.</p> <p>This is where it gets bizarre: I loaded up the Android Hierarchy Viewer that comes with the SDK. When it loaded the view hierarchy from the emulator, POOF, the indicator appeared. It also doesn't seem to be a problem on a physical device. (<strong>EDIT:</strong> After some more testing, it appears to be an issue with 2.3, as it doesn't happen on higher versioned devices, but does happen on a 2.3.6 phone.)</p> <p>Any idea why this is happening? Is it reasonable to assume that this is just a quirk of the emulator, or should I be worried that it won't work on some devices? Any hacks to get it to show up? What does the hierarchy viewer do that might be forcing it to refresh itself?</p>

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