ViewPager没有得到使用FragmentStatePagerAdapter更新 [英] ViewPager not getting updated using FragmentStatePagerAdapter

问题描述

我有两个片段，片段A 和片段B 。 片段A 列出所有的产品和片段B 显示详细询问产品及其形象。

I've a two fragments, Fragment A and Fragment B. Fragment A lists all products and Fragment B shows detail about the product and its images.

片段A 电话片段B 和片段B 从获取Web服务和数据集以 ViewPager 使用适配器。最初，它会显示正确的图像，但此后它总是有相同的图像。

Fragment A calls Fragment B and Fragment B fetches data from web service and sets to ViewPager using Adapter. Initially it displays correct image but thereafter it always have the same image.

如果我们火 adapter.notifyDataSetChanged（）从片段B的任何点击事件，然后它的作品完美，但我们必须要尽快显示为片段B是可见的。

If we fire adapter.notifyDataSetChanged() from any click event in Fragment B then it works perfectly but we have to display as soon as Fragment B is visible

请看看code。

 public class ImageAdapter extends FragmentStatePagerAdapter {

private List<String> pImageURL;

public ImageAdapter(FragmentManager fm, List<String> imageURL) {
    super(fm);
    // TODO Auto-generated constructor stub

    pImageURL = imageURL;
    Utility.showLog("PagerAdapter URL", pImageURL.toString());
}

@Override
public Fragment getItem(int position) {
    // TODO Auto-generated method stub

    String imageURL = pImageURL.get(position);

    PImageFragment imageFragment = (PImageFragment) PImageFragment.getInstance();
    imageFragment.setProductImage(imageURL);
    return imageFragment;
}

@Override
public int getItemPosition(Object object) {

    PImageFragment pFragment = (PImageFragment) object;
    String URL = pFragment.getProductImage();

    int position = pImageURL.indexOf(URL);

    if (position>=0)
        URL = pImageURL.get(position);

    if (position>=0)
        return position;
    else
        return POSITION_NONE;

}

@Override
public int getCount() {
    // TODO Auto-generated method stub
    return pImageURL.size();
   }
}

片段B

   // Image Loading Process

    String p_images = model.getProdutImageURL();

    imageUrl = new ArrayList<String>();


    if (p_images.contains(","))
        imageUrl.addAll(Arrays.asList(p_images.split(",")));
    else
        imageUrl.add(p_images);

    mAdapter = new ImageAdapter(getChildFragmentManager(), imageUrl);
    vPager.setPageTransformer(true, new DepthPageTransformer());
    vPager.setAdapter(mAdapter);

    mAdapter.notifyDataSetChanged();

PImage片段

public class PImageFragment extends Fragment {

private static final String TAG = "Product_Images_Fragment";
private View rootView;

private ImageView ivProductImage;
private String imageURL;

@Override
@Nullable
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // TODO Auto-generated method stub

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

    bindComponents(rootView);
    loadImages(imageURL);
    return rootView;

}

public static Fragment getInstance() {

    Fragment fragment = new PImageFragment();
    return fragment;
}

public void setProductImage(String image_url) {

    imageURL = image_url;
    Utility.showLog(TAG + "Received URL : ", imageURL.toString());

}

public String getProductImage() {

    return imageURL;
}

private void bindComponents(View v) {
    // TODO Auto-generated method stub

    ivProductImage = (ImageView) v.findViewById(R.id.ivProductImage);
}

private void loadImages(String image_url) {


    Utility.showLog(TAG,
            "http://baryapp.com/kickzexchange/assets/products/" + image_url);

    final ProgressBar pBar = (ProgressBar) rootView
            .findViewById(R.id.pBarLoader);
    pBar.setVisibility(View.VISIBLE);

    ImageLoader imgLoader = VolleySingleton.getInstance().getImageLoader();

    imgLoader.get("http://baryapp.com/kickzexchange/assets/products/"
            + image_url, new ImageListener() {

        @Override
        public void onErrorResponse(VolleyError vError) {
            // TODO Auto-generated method stub

            Utility.showLog(TAG, vError.getLocalizedMessage() + "");
        }

        @Override
        public void onResponse(ImageContainer response, boolean result) {
            // TODO Auto-generated method stub

            if (response.getBitmap() != null) {

                ivProductImage.setImageBitmap(response.getBitmap());
                pBar.setVisibility(View.GONE);

            }
        }
    });
}


}

更新

    // This is how fragment A calls fragment B
   ProductDetail pDetail = new ProductDetail();

    Bundle bundle = new Bundle();
    bundle.putString("product_id", productList.get(position).getProductID());
    bundle.putString("product_title", productList.get(position).getProductTitle());

    pDetail.setArguments(bundle);

    ((MyTabActivity) mActivity).navigateFragment(Utility.BUY_TAB, pDetail,
            true);

最新更新

    public void navigateFragment(String tag, Fragment fragment,
                             boolean shouldAdd) {

    FragmentManager manager = getSupportFragmentManager();
    FragmentTransaction ft = manager.beginTransaction();


    if (shouldAdd)
        mStacks.get(tag).push(fragment); // push fragment on stack


    if (mCurrentFragment != null) {
        saveFragmentState(mCurrentFragment.getClass().getName(), mCurrentFragment);
    }

    mCurrentFragment = fragment;
    restoreFragmentState(fragment.getClass().getName(), fragment);


    ft.replace(android.R.id.tabcontent, fragment);

    ft.commit();


}

 @Override
protected void onSaveInstanceState(Bundle outState) {
    // TODO Auto-generated method stub
    super.onSaveInstanceState(outState);

    Bundle fragmentStates = new Bundle(mFragmentStates.size());

    for (Map.Entry<String, Fragment.SavedState> entry : mFragmentStates.entrySet()) {
        fragmentStates.putParcelable(entry.getKey(), entry.getValue());
    }
    outState.putParcelable(KEY_FRAGMENT_STATES, fragmentStates);
}


private void saveFragmentState(String id, Fragment fragment) {

    Fragment.SavedState fragmentState =
            getSupportFragmentManager().saveFragmentInstanceState(fragment);
    mFragmentStates.put(id, fragmentState);


}

private void restoreFragmentState(String id, Fragment fragment) {

    Fragment.SavedState fragmentState = mFragmentStates.remove(id);

    if (fragmentState != null) {

        if (!fragment.isAdded())
            fragment.setInitialSavedState(fragmentState);

    }

}

任何帮助/想法是非常AP preciated。

Any help/idea is highly appreciated.

推荐答案

最后，我已经解决了答案。 片段B 天渐渐保存在 navigateFragment ，它已经由下面一行pvented $ P $和它的工作。

Finally I've solved the answer. Fragment B was getting saved in navigateFragment, it has been prevented by the following line and it worked.

    if (mCurrentFragment != null) {
        if (mCurrentFragment instanceof GetProducts)
            saveFragmentState(mCurrentFragment.getClass().getName(), mCurrentFragment);
    }

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