不能將標籤添加到片段

Question

我想構建和包含2個片段的活動。我已經構建其中一個，但我希望另一個在其中有選項卡。問題是，我在tabHost上得到一個錯誤。 addTab（）;

這裏是我的片段

public class StatisticsFragment extends android.support.v4.app.Fragment { 

Context mContext; 
FragmentTabHost tabHost; 
View rootView; 
public StatisticsFragment() { 
    // Required empty public constructor 
} 


@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    // Inflate the layout for this fragment 

    mContext = getActivity().getApplicationContext(); 

    rootView = inflater.inflate(R.layout.fragment_statistics, container, false); 

    tabHost = (FragmentTabHost) rootView.findViewById(android.R.id.tabhost); 

    tabHost.setup(getActivity(), getFragmentManager(), android.R.id.tabcontent); 
Intent purposeIntent = new Intent(mContext, PurposeTab.class); 
    FragmentTabHost.TabSpec tabPurpose = tabHost 
      .newTabSpec("Purpose") 
      .setIndicator("Purpose") 
      .setContent(purposeIntent); 

    Intent priorityIntent = new Intent(mContext, PriorityTab.class); 
    FragmentTabHost.TabSpec tabPriority = tabHost 
      .newTabSpec("Priority") 
      .setIndicator("Priority") 
      .setContent(priorityIntent); 

    tabHost.addTab(tabPurpose); 
    tabHost.addTab(tabPriority); 
    tabHost.setCurrentTab(1); 
    return rootView; 
} 

，這裏是我的活動

protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    StatisticsFragment fragmentStatistics = new StatisticsFragment(); 
    MainPageButtonsFragment fragmentMain = new MainPageButtonsFragment(); 


    getSupportFragmentManager().beginTransaction().add(R.id.fragment_statistics, fragmentStatistics, "Statistics").commit(); 
    getSupportFragmentManager().beginTransaction().add(R.id.main_page_buttons_fragment, fragmentMain, "Buttons").commit(); 
} 

這是我的logcat這表明我的錯誤是在addTab，甚至認爲我可能忘了「的設置方法「 但我不是！

E/AndroidRuntime: FATAL EXCEPTION: main 
E/AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{}: java.lang.IllegalStateException: Did you forget to call 'public void setup(LocalActivityManager activityGroup)'? 

10-06 12:03:56.967 4033-4033/ E/AndroidRuntime:  at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:692) 
10-06 12:03:56.967 4033-4033/ E/AndroidRuntime:  at android.widget.TabHost.setCurrentTab(TabHost.java:358) 
10-06 12:03:56.967 4033-4033/ E/AndroidRuntime:  at android.widget.TabHost.addTab(TabHost.java:236) 
10-06 12:03:56.967 4033-4033/ E/AndroidRuntime:  at .StatisticsFragment.onCreateView(StatisticsFragment.java:64) 
10-06 12:03:56.967 4033-4033/ E/AndroidRuntime:  at android.support.v4.app.Fragment.performCreateView(Fragment.java:1962) 
10-06 12:03:56.967 4033-4033/ E/AndroidRuntime:  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1026) 
10-06 12:03:56.967 4033-4033/ E/AndroidRuntime:  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1207) 
10-06 12:03:56.967 4033-4033/ E/AndroidRuntime:  at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:738) 
10-06 12:03:56.967 4033-4033/ E/AndroidRuntime:  at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1572) 
10-06 12:03:56.967 4033-4033/ E/AndroidRuntime:  at android.support.v4.app.FragmentController.execPendingActions(FragmentController.java:330) 
10-06 12:03:56.967 4033-4033/ E/AndroidRuntime:  at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:511) 
10-06 12:03:56.967 4033-4033/ E/AndroidRuntime:  at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1163) 
10-06 12:03:56.967 4033-4033/ E/AndroidRuntime:  at android.app.Activity.performStart(Activity.java:5018) 

Answer 1

最簡單的方式，在我看來，對標籤添加到任何東西（活動，片段），使用TabLayout由谷歌設計支持庫。

在您的佈局文件，添加TabLayout和ViewPager：

<android.support.design.widget.TabLayout 
     android:id="@+id/tabLayout" 
     android:layout_width="match_parent" 
     android:layout_height="?attr/actionBarSize" 
     android:background="@android:color/white" 
     android:gravity="bottom" 
     app:tabGravity="fill" 
     app:tabMode="fixed"/> 
-------------------------------------- 
<android.support.v4.view.ViewPager 
    android:id="@+id/viewPager" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"/> 

在您的片段/活動文件將它們連接起來，通過調用tabLayout.setupWithViewPager(mPager);

你也應該重寫你的getPageTitle方法ViewPagerAdapter：

public static class ViewPagerAdapter extends FragmentStatePagerAdapter { 
    public ViewPagerAdapter(FragmentManager fm) { 
     super(fm); 
    } 

    private String mTabTitles[] = new String[]{"Tab 1", "Tab 2"}; 

    @Override 
    public android.support.v4.app.Fragment getItem(int num) { 
     return MyFragment.newInstance(); 
    } 
    @Override 
    public int getCount() { 
     return mCount; 
    } 

    @Override 
    public CharSequence getPageTitle(int position) { 
     // Generate title based on item position 
     return mTabTitles[position]; 
    } 
}