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POGridView Loads Slowly After setAdapter() Is Called
 

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  1. POGridView Loads Slowly After setAdapter() Is Called
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    <p>I have <code>GridView</code>s laid across my 3 page <code>ViewPager</code>. The idea is to build a monthly view of a calendar that scrolls infinitely as far as the user wants.</p> <p>I based my work mostly off <a href="https://stackoverflow.com/users/127422/jon-willis">Jon Willis</a>' <a href="http://code.google.com/p/electricsleep/source/browse/trunk/src/com/androsz/electricsleepbeta/app/HistoryMonthActivity.java" rel="nofollow noreferrer">implementation</a> of infinite view paging. But instead of implementing my own <code>View</code> object; I'm using <code>GridView</code>s.</p> <p>Here's my implementation of the <code>onPageScrollStateChanged</code> method:</p> <pre><code>@Override public void onPageScrollStateChanged(int state) { if (state == ViewPager.SCROLL_STATE_IDLE) { FragmentPagerAdapter adapter = (FragmentPagerAdapter) mMonthPager .getAdapter(); // Called to obtain reference for the Fragments inside the ViewPager. CalendarGridMonthlyFragment oldMinMonthFragment = (CalendarGridMonthlyFragment) adapter .instantiateItem(mMonthPager, 0); CalendarGridMonthlyFragment oldMidMonthFragment = (CalendarGridMonthlyFragment) adapter .instantiateItem(mMonthPager, 1); CalendarGridMonthlyFragment oldMaxMonthFragment = (CalendarGridMonthlyFragment) adapter .instantiateItem(mMonthPager, 2); // Get the selected month for each Fragment. final Calendar oldMinMonth = oldMinMonthFragment.getSelectedMonth(); final Calendar oldMidMonth = oldMidMonthFragment.getSelectedMonth(); final Calendar oldMaxMonth = oldMaxMonthFragment.getSelectedMonth(); if (mFocusedPage == 0) { final Calendar newMonth = (Calendar) oldMinMonth.clone(); newMonth.add(Calendar.MONTH, -1); oldMinMonthFragment.setSelectedMonth(newMonth); oldMidMonthFragment.setSelectedMonth(oldMinMonth); oldMaxMonthFragment.setSelectedMonth(oldMidMonth); } else if (mFocusedPage == 2) { final Calendar newMonth = (Calendar) oldMaxMonth.clone(); newMonth.add(Calendar.MONTH, 1); oldMinMonthFragment.setSelectedMonth(oldMidMonth); oldMidMonthFragment.setSelectedMonth(oldMaxMonth); oldMaxMonthFragment.setSelectedMonth(newMonth); } mMonthPager.setCurrentItem(1, false); } } </code></pre> <p>And here's my <code>setSelectedMonth</code> method:</p> <pre><code>public void setSelectedMonth(Calendar value) { mMonth = value.get(Calendar.MONTH); mYear = value.get(Calendar.YEAR); CalendarGridMonthlyAdapter newAdapter = new CalendarGridMonthlyAdapter( mContext, GRID_CHIP, mGridWidth, mGridHeight, mMonth, mYear); mGridView.setAdapter(newAdapter); } </code></pre> <p>The infinite swiping works. But there's a noticeable flicker -- almost half a second -- after the scroll has finished.</p> <p>Debugging has shown me that <code>setAdapter</code> method is the culprit of all this fuss. So is there any way to speed up the process of setting new adapter?</p> <p>..or maybe another way of doing this?</p> <p>Thanks in advance!</p>
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    1. PTQuestion
    1. USCommunity
    1. USrhadri
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    1. COCan't you use the same adapter instance, but change the month and year values?
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      1. POGridView Loads Slowly After setAdapter() Is Called
      1. USRajesh
    2. COI did tried that. But it made no changes to the views whatsoever. Even after calling the `notifyDataSetChanged` method.
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      1. POGridView Loads Slowly After setAdapter() Is Called
      1. USrhadri
    3. COI think you should use singleton Fragment pattern here: http://www.androiddesignpatterns.com/2012/05/using-newinstance-to-instantiate.html
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      1. POGridView Loads Slowly After setAdapter() Is Called
      1. USMichał K
 

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