Viewpager選項卡片段

Question

我在片段中有一個viewpager，它在啟動時可以正常工作，但是如果通過replace（）重新加載該片段或用另一個片段替換，則再次加載它。 viewpager無法正常工作。 我的尋呼機中有4個選項卡，根據當前選擇的選項卡，其他選項卡將顯示為空白。 例如，如果選擇了第一個選項卡，則當我重新加載viewpager片段時，第一個選項卡將顯示為空白，其他三個選項卡將起作用。 或者，如果選擇了第三個選項卡，則第一個和第四個選項卡將顯示為空白，而第二個和第三個選項卡將正常工作。 不知道這是否相關，但是如果不調用destory上的removeAllTabs（），則選項卡在操作欄中會出現兩次

編輯：我知道有它，所以如果我單擊工作選項卡上，然后稍等一下在viewpager中空白顯示的視圖。 這可能是由於viewpager嵌套在片段中的結果嗎？

 public class ActionBarTabsPager extends SherlockFragment{
ViewPager mViewPager;
TabsAdapter mTabsAdapter;

@Override
protected void initView(Bundle savedInstanceState) {

    final ActionBar bar = getActionBar();
    bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
    bar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE);

    mTabsAdapter = new TabsAdapter(this, mViewPager);
    mTabsAdapter.addTab(bar.newTab().setText("Simple"),
            CountingFragment.class, null);
    mTabsAdapter.addTab(bar.newTab().setText("List"),
            FragmentPagerSupport.ArrayListFragment.class, null);
    mTabsAdapter.addTab(bar.newTab().setText("Cursor"),
            CursorFragment.class, null);
    mTabsAdapter.addTab(bar.newTab().setText("Another"),
            AnotherFragment.class, null);

    if (savedInstanceState != null) {
        bar.setSelectedNavigationItem(savedInstanceState.getInt("tab", 0));
    }
}

 @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    View rootView = inflater.inflate(R.layout.activity_main, container,
            false);
    mViewPager = (ViewPager) rootView.findViewById(R.id.view_holder);
    initView(savedInstanceState);
    return rootView;
}

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.putInt("tab", getActionBar().getSelectedNavigationIndex());
}

/**
 * This is a helper class that implements the management of tabs and all
 * details of connecting a ViewPager with associated TabHost.  It relies on a
 * trick.  Normally a tab host has a simple API for supplying a View or
 * Intent that each tab will show.  This is not sufficient for switching
 * between pages.  So instead we make the content part of the tab host
 * 0dp high (it is not shown) and the TabsAdapter supplies its own dummy
 * view to show as the tab content.  It listens to changes in tabs, and takes
 * care of switch to the correct paged in the ViewPager whenever the selected
 * tab changes.
 */
public static class TabsAdapter extends FragmentPagerAdapter
        implements ActionBar.TabListener, ViewPager.OnPageChangeListener {
    private final Context mContext;
    private final ActionBar mActionBar;
    private final ViewPager mViewPager;
    private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();

    static final class TabInfo {
        private final Class<?> clss;
        private final Bundle args;

        TabInfo(Class<?> _class, Bundle _args) {
            clss = _class;
            args = _args;
        }
    }

    public TabsAdapter(Activity activity, ViewPager pager) {
        super(activity.getFragmentManager());
        mContext = activity;
        mActionBar = activity.getActionBar();
        mViewPager = pager;
        mViewPager.setAdapter(this);
        mViewPager.setOnPageChangeListener(this);
    }

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

    @Override
    public int getCount() {
        return mTabs.size();
    }

    @Override
    public Fragment getItem(int position) {
        TabInfo info = mTabs.get(position);
        return Fragment.instantiate(mContext, info.clss.getName(), info.args);
    }

    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
    }

    @Override
    public void onPageSelected(int position) {
        mActionBar.setSelectedNavigationItem(position);
    }

    @Override
    public void onPageScrollStateChanged(int state) {
    }

    @Override
    public void onTabSelected(Tab tab, FragmentTransaction ft) {
        Object tag = tab.getTag();
        for (int i=0; i<mTabs.size(); i++) {
            if (mTabs.get(i) == tag) {
                mViewPager.setCurrentItem(i);
            }
        }
    }

    @Override
    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
    }

    @Override
    public void onTabReselected(Tab tab, FragmentTransaction ft) {
    }
}
 @Override
public void onDestroyView() {
    super.onDestroyView();
    mActionBar.removeAllTabs();
}
}

Answer 1

找到了答案：使用getChildFragmentManager() 。

在上面的代碼中，此操作已修復：

  public TabsAdapter(SherlockFragment frag, ViewPager pager) {
    super(frag.getChildFragmentManager());
    mContext = frag.getActivity();
    mActionBar = mContext.getActionBar();
    mViewPager = pager;
    mViewPager.setAdapter(this);
    mViewPager.setOnPageChangeListener(this);
}