Android刷新片段中的ViewPager

在发布文章之前，我曾尝试在内部搜索，但我无法理解如何刷新片段中承载的ViewPager的内容。 你能帮我吗

谢谢你抽出时间

这是我的密码。 我有一个片段活动，它承载了ViewPager。它显示不同的小部件，ViewPager显示不同的图像，我在代码中调用db“carosello”返回的图像列表。当我执行搜索时，我调用refresh（）方法作为宿主此片段的主活动的回调，然后再次设置所有视图。适用于片段中的所有信息，但不适用于ViewPager：始终显示最旧（首次创建）的图像

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());
}
}

多亏了这篇文章，我解决了这个问题

---

将

MyPageAdapter扩展FragmentPagerAdapter

更改为

MyPageAdapter扩展FragmentStatePagerAdapter

片段方法中的第一个重写

@凌驾

public void setUserVisibleHint(boolean isVisibleToUser) {

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

        actionView();
    }
    else{
        //no
    }

}

---

谢谢在更换碎片时遇到同样的问题请帮助我你救了我一天！魔术我自己找了几个小时后帮了我，这很有效，谢谢！

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;
}
}

public void setUserVisibleHint(boolean isVisibleToUser) {

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

        actionView();
    }
    else{
        //no
    }

}