android-fragments - 重复的标签标题 android actionbar 片段

Question

我在名为 TabHostFragment 的片段中使用操作栏实现了选项卡

public class TabHostFragment extends Fragment {

public TabHostFragment() {
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);     
    if(savedInstanceState == null){
    }

}


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_tab_host, null, false);
    ViewPager mViewPager = (ViewPager) rootView.findViewById(R.id.pager);
    ActionBar actionbar = this.getActivity().getActionBar();

    actionbar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
    actionbar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE);

    TabsAdapter mTabsAdapter = new TabsAdapter(this, mViewPager);
    mTabsAdapter.addTab(actionbar.newTab().setText("Summoner"),
            SummonerFragment.class, null);
    mTabsAdapter.addTab(actionbar.newTab().setText("Games"),
            GameHistoryListFragment.class, null);
    mTabsAdapter.addTab(actionbar.newTab().setText("League"),
            LeagueFragment.class, null);
    mTabsAdapter.addTab(actionbar.newTab().setText("Masteries"),
            MasteriesFragment.class, null);
    mTabsAdapter.addTab(actionbar.newTab().setText("Runes"),
            RunesFragment.class, null);
    return rootView;
}

}`

TabsAdapter 类在这里

public 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(Fragment frag, ViewPager pager) {
    super(frag.getChildFragmentManager());
    frag.getChildFragmentManager();
    mContext = frag.getActivity();
    mActionBar = frag.getActivity().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) {
    mViewPager.setCurrentItem(tab.getPosition());
}

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

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

主事件持有一个 NavigationDrawer，它将 TabHostFragment 加载到事件中

        if(position == 1){
        fragment = new TabHostFragment();
        FragmentManager fragmentManager = this.getSupportFragmentManager();
        if(!fragmentManager.findFragmentById(R.id.list_container).getClass().equals(TabHostFragment.class)){
            fragmentManager.beginTransaction().replace(R.id.list_container, fragment).addToBackStack(null).commit();
            if(mTwoPane){
                FrameLayout fl = (FrameLayout) findViewById(R.id.detail_container);
                fl.removeAllViews();
                findViewById(R.id.detail_container).setVisibility(View.GONE);
            }
        }

    }

当离开此片段并返回时，即在抽屉导航中选择其他内容，然后按返回键或在抽屉中选择 TabHostFragment，选项卡标题会重复。还不能发图片所以

我不确定为什么会这样，并且在 stackoverflow 上的任何地方都找不到类似的问题。

Answer 1

当您重新进入您的特定 View 时，选项卡似乎没有从 ActionBar 中清除。

在添加更多选项卡之前尝试使用 mActionBar.RemoveAllTabs()。也许在您的 TabsAdapter 的构造函数中。