Android odświeżyć ViewPager wewnątrz fragmentu

Question

Próbowałem wyszukiwać w SO przed postem, ale nie jestem w stanie zrozumieć, jak odświeżyć zawartość ViewPager hostowany wewnątrz fragmentu. Czy możesz mi pomóc?

Dziękuję za poświęcony czas

Tutaj mój kod. Mam aktywność fragmentów, które obsługują ViewPager wewnątrz niego. Pokazuje inny widget, a ViewPager pokazuje inny obraz, nazywam zwróconą listę obrazów z db "carosello" w kodzie. Kiedy wykonuję wyszukiwanie, wywołuję metodę refresh() jako wywołanie zwrotne z głównego działania hostującego ten fragment i ponownie konfiguruję wszystkie widoki. Działa dobrze dla wszystkich informacji w fragmencie, ale nie działa dla ViewPagera: najstarszy obraz (utworzony po raz pierwszy) jest zawsze wyświetlany.

public class Page2FamigliaFragment extends Fragment { 

//... variable declaration 

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

    // fragment not when container null 
    if (container == null) { 
     return null; 
    } 
    // inflate view from layout 
    View view = (LinearLayout)inflater.inflate(R.layout.famiglia_page2,container,false); 

    //retrieve my object from the main view that host this fragment 
    info = ((MainFamiglia)this.getActivity()).getMyObject(); 

    //run the setup of the view.  
    setUpMyPage2View(view); 

    return view; 
} 

public void setUpMyPage2View(View view) 
{ 
//... inizialization of some other objects and view - i do not show only because is out of topic for this matter 
//retrive the image used in the page viewer 
    carosello = info.getCarosello(); 
    parts = carosello.split(","); 

    //how many page ?? 
    int i = parts.length/3; 
    int resto = parts.length % 3; 
    int pages = 0; 
    if (resto!=0) { 
     pages = i + 1; 
    } else { 
     pages = i; 
    } 

List<Fragment> fragments = new ArrayList<Fragment>(); 

    String[] tempArray; 
    int startIndex = 0; 
    int endIndex = 3; 


    if (parts.length <= 3) { 

    fragments.add(myCarosello.newInstance(parts)); 

    } else { 


    tempArray = Arrays.copyOfRange(parts, startIndex, endIndex); 

    for (int p=0; p < pages; p++) { 

     fragments.add(myCarosello.newInstance(tempArray)); 
     startIndex = endIndex; 
     endIndex = ((endIndex+3) > parts.length) ? parts.length : (endIndex+3); 
     tempArray = Arrays.copyOfRange(parts, startIndex, endIndex); 

    } 

    } 

    pageAdapter = new MyPageAdapter(getChildFragmentManager(), fragments); 

    pager = (ViewPager) view.findViewById(R.id.viewpager); 
    pager.setAdapter(pageAdapter); 
    pager.setOnTouchListener(new OnTouchListener() { 

     @Override 
     public boolean onTouch(View v, MotionEvent event) { 
      if(
        event.getAction() == MotionEvent.ACTION_DOWN && 
        v instanceof ViewGroup 
     ) { 
        ((ViewGroup) v).requestDisallowInterceptTouchEvent(true); 
      } 
      return false; 
     } 
    }); 

} 

//i call this method from a callback from the main view for refresh this fragment 
public void refresh(){ 
    //recupero oggetto dalla activity principale 
    info = ((MainFamiglia)this.getActivity()).getMyObject(); 
    pager.getAdapter().notifyDataSetChanged(); 
    pager.removeAllViews(); 
    setUpMyPage2View(this.getView()); 
} 
} 

Jest to klasa dla pageAdapter

public class MyPageAdapter extends FragmentPagerAdapter { 

// fragments to instantiate in the viewpager 
    private List<Fragment> fragments; 

    // constructor 
    public MyPageAdapter(FragmentManager fm,List<Fragment> fragments) { 
     super(fm); 
     this.fragments = fragments; 
    } 

    // return access to fragment from position, required override 
    @Override 
    public Fragment getItem(int position) { 
     return this.fragments.get(position); 
    } 

    // number of fragments in list, required override 
    @Override 
    public int getCount() { 
     return this.fragments.size(); 
    } 

    public int getItemPosition(Object object) { 
     return POSITION_NONE; 
} 

}

i jest to klasa dla ImageView wewnątrz pageviewer

public class myCarosello extends Fragment { 

public static final String EXTRA_MESSAGE = "EXTRA_MESSAGE"; 
private int numeroImmagini = 0; 

public static final myCarosello newInstance(String[] pictures) 
{ 
    myCarosello f = new myCarosello(); 
    Bundle bdl = new Bundle(1); 
    bdl.putStringArray(EXTRA_MESSAGE, pictures); 
    f.setArguments(bdl); 

    return f; 
} 

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

    String[] pictures = getArguments().getStringArray(EXTRA_MESSAGE); 
    numeroImmagini = pictures.length; 

    View view = (LinearLayout)inflater.inflate(R.layout.carosello,container,false); 

    ImageView imageView1 = (ImageView) view.findViewById(R.id.carosello1); 
    ImageView imageView2 = (ImageView) view.findViewById(R.id.carosello2); 
    ImageView imageView3 = (ImageView) view.findViewById(R.id.carosello3); 

    switch (numeroImmagini) { 
    case 1: 
     imageView1.setImageResource(returnImageResource(pictures[0])); 
     imageView2.setVisibility(View.GONE); 
     imageView3.setVisibility(View.GONE); 
    break; 
    case 2: 
     imageView1.setImageResource(returnImageResource(pictures[0])); 
     imageView2.setImageResource(returnImageResource(pictures[1])); 
     imageView3.setVisibility(View.GONE); 
    break; 
    case 3: 
     imageView1.setImageResource(returnImageResource(pictures[0])); 
     imageView2.setImageResource(returnImageResource(pictures[1])); 
     imageView3.setImageResource(returnImageResource(pictures[2])); 
    break; 

    } 

    return view; 

} 

//return the correct resource name 
private int returnImageResource(String image) 
{ 
    image = image.replace(" ", "_"); 
    String filenameArray[] = image.split("\\."); 
    image = "img_" + filenameArray[0].toLowerCase(); 
    int drawableImageId = getActivity().getResources().getIdentifier(image, "drawable", getActivity().getPackageName()); 
    return drawableImageId; 
} 
} 

Answer 1

I został rozwiązany dzięki this poczta zmiana MyPageAdapter extends FragmentPagerAdapter na MyPageAdapter extends FragmentStatePagerAdapter.

Answer 2

pierwszy odblokowania w sposób fragment

@Override

public void setUserVisibleHint(boolean isVisibleToUser) { 

    super.setUserVisibleHint(isVisibleToUser); 
    if(isVisibleToUser){ 

     actionView(); 
    } 
    else{ 
     //no 
    } 

}