從片段viewpager返回空白

Question

我正在與viewpager和Tablayout安卓應用程序。這是從父活動

public class HomeFragment extends Fragment{ 
    private SectionsPagerAdapter mSectionsPagerAdapter; 
    private ViewPager mViewPager; 
public HomeActivity() { 
} 

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

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

    mSectionsPagerAdapter = new SectionsPagerAdapter(getFragmentManager()); 

    mViewPager = (ViewPager) rootView.findViewById(R.id.container); 
    mViewPager.setAdapter(mSectionsPagerAdapter); 

    TabLayout tabLayout = (TabLayout) rootView.findViewById(R.id.tabs); 
    tabLayout.setupWithViewPager(mViewPager); 
    return rootView; 
} 
} 

打開我的觀點尋呼機片段，這是我的適配器viewpager

public class SectionsPagerAdapter extends FragmentStatePagerAdapter { 

public SectionsPagerAdapter(FragmentManager fm) { 
    super(fm); 
} 

@Override 
public Fragment getItem(int position) { 
    switch (position){ 
     case 0 : return new Settingsfragment(); 
     case 1 : return new Profilefragment(); 
     case 2 : return new Categoriesfragment(); 
    } 
    return null; 
} 
@Override 
public int getCount() { 
    // Show 3 total pages. 
    return 3; 
} 
@Override 
public CharSequence getPageTitle(int position) { 
    switch (position) { 
     case 0: 
      return "settings"; 
     case 1: 
      return "profile"; 
     case 2: 
      return "Category"; 
    } 
    return null; 
} 
} 

當我打開一個片段與下面的代碼，然後按回viewpager成爲空

public class Profilefragment extends Fragment { 
public Profilefragment(){} 
@Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 

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

    TextView VE = (TextView) rootView.findViewById(R.id.profile_view_enquiry); 
    VE.setOnClickListener(new View.OnClickListener(){ 
     public void onClick (View view){ 
      Fragment fragment = null; 
      fragment = new Enquiryfragment(); 
      replaceFragment(fragment); 
     } 
    }); 

    TextView CA = (TextView) rootView.findViewById(R.id.profile_change_address); 
    CA.setOnClickListener(new View.OnClickListener(){ 
     public void onClick (View view){ 
      Fragment fragment = null; 
      fragment = new ChangeAddressfragment(); 
      replaceFragment(fragment); 
     } 
    }); 

    return rootView; 
} 
public void replaceFragment(Fragment someFragment) { 
    android.support.v4.app.FragmentTransaction transaction = getFragmentManager().beginTransaction(); 
    transaction.replace(R.id.containerView, someFragment); 
    transaction.addToBackStack(null); 
    transaction.commit(); 
}} 

我該如何解決這個問題。請幫忙。

Answer 1

public class HomeFragment extends Fragment{ 
    private SectionsPagerAdapter mSectionsPagerAdapter; 
    private ViewPager mViewPager; 

    public HomeFragment() {} 

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

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

     mSectionsPagerAdapter = new SectionsPagerAdapter(getChildFragmentManager());//Changed here 

     mViewPager = (ViewPager) rootView.findViewById(R.id.container); 
     mViewPager.setAdapter(mSectionsPagerAdapter); 

     TabLayout tabLayout = (TabLayout) rootView.findViewById(R.id.tabs); 
     tabLayout.setupWithViewPager(mViewPager); 
     return rootView; 
    } 
} 

您應該使用getChildFragmentManager()代替getFragmentManager()在Fragment