Illegalstateexception: the Application's Pageradapter Changed the Adapter's Content Without Calling Pageradapter#Notifydatasetchanged

IllegalStateException: The application's PagerAdapter changed the adapter's content without calling PagerAdapter#notifyDataSetChanged

I had a hard time making my ViewPager working. At the end, it seems that the example in the documentation is wrong.

The addTab method should be as follows:

public void addTab(Tab tab, Class<?> clss, Bundle args) {
        TabInfo info = new TabInfo(clss, args);
        tab.setTag(info);
        tab.setTabListener(this);
        mTabs.add(info);
        notifyDataSetChanged();
        mActionBar.addTab(tab);
    }

Notice the order of the last three operations. In the original example, notifyDataSetChanged was called after the mActionBar.addTab function.

Unfortunately, as soon as you call the addTab on the ActionBar, the first tab you add is automatically selected. Because of this, the onTabSelected event is fired and while trying to retrieve the page, it throws the IllegalStateException because it notices a discrepancy between the expected item count and the actual one.

java.lang.IllegalStateException: The application's PagerAdapter changed the adapter's contents without calling PagerAdapter#notifyDataSetChanged

Using clone() method to copy the data from the ArrayList which i passed to the constructor of ViewPager's adapter finally solved the issue.

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