fragmentstatepageradapter

在一个 Android 应用中，我使用 FragmentPagerAdapter 来处理多 Fragment 页面的横向滑动。不过我碰到了一个问题，即当 Fragment 对应的数据集发生改变时，我希望能够通过调用 mAdapter.notifyDataSetChanged() 来触发 Fragment 页面使用新的数据调整或重新生成其内容，可是当我调用 notifyDataSetChanged() 后，发现什么都没发生。 搜索之后发现不止我一个人碰到这个问题，大家给出的解决办法五花八门，有些确实解决了问题，但是我总感觉问题没搞清楚。于是我决定搞明白这个问题到底是怎么回事，以及正确的用法到底如何。要搞明白这个问题，仅仅阅读文档并不足够，还需要阅读相关几个类的相关方法的实现，搞懂其设计意图。下面就是通过阅读源代码搞明白的内容。 【ViewPager】 ViewPager 如其名所述，是负责翻页的一个 View。准确说是一个 ViewGroup ，包含多个 View 页，在手指横向滑动屏幕时，其负责对 View 进行切换。为了生成这些 View 页，需要提供一个 PagerAdapter 来进行和数据绑定以及生成最终的 View 页。 setAdapter() ViewPager 通过 setAdapter() 来建立与 PagerAdapter 的联系。这个联系是双向的，一方面

So I have this problem when using the ViewPager with a FragmentStatePagerAdapter AND then I'm trying to select the current page (i.e. show the second page to the user instead of the first one) that I get this exception from time to time. The issue seems to be concurrency, as the viewpager is still adding/initializing the fragments i.e. currently running a fragment transaction while I'm trying to set the current page. Something like this: pagerAdapter = new MyFragmentPagerAdapter(getChildFragmentManager()); viewPager.setAdapter(pagerAdapter); pagerAdapter.addItems(...) //Addings ID's here for

I had a nice a pretty ViewPager/FragmentStatePagerAdapter working on my app but after manually adding a Fragment to the FragmentManager I started getting this exception when rotating the screen TWICE . StackTrace: 07-29 19:10:22.360: E/FragmentManager(712): Fragement no longer exists for key f0: index 1 07-29 19:10:22.360: E/FragmentManager(712): Activity state: 07-29 19:10:22.407: D/FragmentManager(712): Active Fragments in 4608be98: 07-29 19:10:22.410: D/FragmentManager(712): #0: RESTFragment{46005fb0 #0 RESTFragment} 07-29 19:10:22.410: D/FragmentManager(712): mFragmentId=#0 mContainerId=#0

I've a two fragments , Fragment A and Fragment B . Fragment A lists all products and Fragment B shows detail about the product and its images. Fragment A calls Fragment B and Fragment B fetches data from web service and sets to ViewPager using Adapter . Initially it displays correct image but thereafter it always have the same image. If we fire adapter.notifyDataSetChanged() from any click event in Fragment B then it works perfectly but we have to display as soon as Fragment B is visible Please look at the code. public class ImageAdapter extends FragmentStatePagerAdapter { private List<String>

I am trying to have the same view pager + tabs design as the PlayStore 5.1.x. Here is my layout : <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_gravity="center_vertical|center_horizontal" android:gravity="center_vertical|center_horizontal" android:orientation="vertical"> <com.astuetz.PagerSlidingTabStrip android:id="@+id/tabs" android:layout_width="match_parent" android:layout_height="50dp" android:background="@drawable/background_tabs" />

I have 4 fragments in a viewpager. And FragmentStatePagerAdapter inside the activity where my viewpager is. FragmentStatePagerAdapter's newInstance() method takes as parameter layout id, therefore each fragment has it's own layout: ViewPager pager; public class MainActivity extends FragmentActivity{ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); pager = (ViewPager) findViewById(R.id.viewPager); pager.setAdapter(new MyPagerAdapter(getSupportFragmentManager()));} private static class MyPagerAdapter

Here is the full stack trace of the error: http://pastebin.com/5dQHkUw3 The error started to appear only after I started using fragments in the project, because I want to give JSON feeds. It was fine before when I was creating Tabs, NavigationDrawer etc. MainActivity.java public class MainActivity extends ActionBarActivity implements MaterialTabListener{ private Toolbar mToolbar; private NavigationDrawerFragment mDrawerFragment; private DrawerLayout mDrawerLayout; private MaterialTabHost mTabHost; private ViewPager mViewPager; public static final int SERVICES_ALL = 1; public static final int