Question

我有一个片段，我在其中插入带有视图寻呼机的标签布局。问题是当我从服务器获取onSuccess方法中的数据时，我的适配器不会更新数据。它在我的onSuccess方法被调用之前被初始化。如何告诉我的适配器重新考虑我的数据？我尝试了notifyDataSetChanged()，但它不起作用。

我的片段

public class CinemaFragmentLandingPage extends BaseHomeFragment implements View.OnClickListener, TabLayout.OnTabSelectedListener, CinemasContract.View {

private CinemasContract.Presenter mPresenterCinemas;

private ViewPager mViewPager;

private TabLayout mTabLayout;

private CinemaFragmentTabAdapter mCinemaTabAdapter;

private List<CinemasModel> mDataCinemas;

public static CinemaFragmentLandingPage newInstance() {
    return new CinemaFragmentLandingPage();
}

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

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

    mDataCinemas = new ArrayList<>();

    mPresenterCinemas.getCinemas();

    initViews(rootView);

    return rootView;
}

private void initViews(View rootView) {
    mTabLayout = rootView.findViewById(R.id.tab_layout);

    mTabLayout.addTab(mTabLayout.newTab().setText(getResources().getString(R.string.cinemas)));

    mTabLayout.addTab(mTabLayout.newTab().setText(getResources().getString(R.string.films)));

    mViewPager = rootView.findViewById(R.id.pager);

    mCinemaTabAdapter = new CinemaFragmentTabAdapter(this.getChildFragmentManager(), 2, mDataCinemas);

    mViewPager.setAdapter(mCinemaTabAdapter);

    mViewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(mTabLayout));

    mTabLayout.setOnTabSelectedListener(this);

}

@Override
public void onClick(View view) {

}

@Override
public void onTabSelected(TabLayout.Tab tab) {
    mViewPager.setCurrentItem(tab.getPosition());
}

@Override
public void onTabUnselected(TabLayout.Tab tab) {

}

@Override
public void onTabReselected(TabLayout.Tab tab) {

}

@Override
public void setLoading(boolean isActive) {
    mHomeActivity.setLoadingDialog(isActive);
}

@Override
public void showGetCinemasSuccess(List<CinemasModel> cinemasModels) {
    setLoading(false);
    mDataCinemas = cinemasModels;
    mViewPager.getAdapter().notifyDataSetChanged();
    mViewPager.getAdapter().getItemPosition(0);
}

@Override
public void showGetCinemasFail(int errorCode) {
    setLoading(false);
}

@Override
public void setPresenter(CinemasContract.Presenter presenter) {
    mPresenterCinemas = Preconditions.checkNotNull(presenter);
}

}

我的适配器

public class CinemaFragmentTabAdapter extends FragmentStatePagerAdapter {

private int mNumOfTabs;

private ArrayList<CinemasModel> mCinemasData;

public CinemaFragmentTabAdapter(FragmentManager fm, int numOfTabs, List<CinemasModel> cinemasData) {
    super(fm);
    this.mNumOfTabs = numOfTabs;
    this.mCinemasData = new ArrayList<CinemasModel>();
    this.mCinemasData.addAll(cinemasData);
}

@Override
public Fragment getItem(int position) {
    Fragment tab = null;
    Bundle cinemasBundle = new Bundle();
    cinemasBundle.putParcelableArrayList("cinemas", this.mCinemasData);

    switch (position) {

        case 0:
            tab = new CinemaFragment();
            tab.setArguments(cinemasBundle);
            break;

        case 1:
            tab = new FilmsFragment();
            tab.setArguments(cinemasBundle);
            break;

        default:
            break;
    }
    return tab;
}

@Override
public int getCount() {
    return mNumOfTabs;
}
}

任何帮助将不胜感激。

Answer 1

首先在你的pojo类中定义构造函数，比如..

  public CinemasModel(String title, String description, String imageUrl, String author, String url) {

        this.title = title;
        this.description = description;
        this.imageUrl = imageUrl;
        this.author = author;
        this.url = url;
    }

然后更新此代码。

 CinemasModel cinemas= new CinemasModel(title, description, url, imageUrl, author);

 mDataCinemas.add(cinemas);
 System.out.println("mDataCinemas size = " + mDataCinemas.size());

 mCinemaTabAdapter = new inemaFragmentTabAdapter(getActivity(), mDataCinemas);
 mViewPager.setAdapter(mCinemaTabAdapter );
 mCinemaTabAdapter.notifyDataSetChanged();

注意：在pojo类中更新您的参数而不是标题，描述等。我希望它对您有所帮助..

Answer 2

mDataCinemas = cinemasModels;

到

mDataCinemas.clear();
mDataCinemas.addAll(cinemasModels);

并调用notifyDataSetChange。我认为这会对你有所帮助

Answer 3

在viewpager适配器中使用一个参数作为ArrayList mCinemasData添加方法刷新，并在方法内添加2行以下 this.mCinemasData = mCinemasData; notifyDataSetChanged（）; 从onsuccess调用方法，让我知道发生了什么？

Answer 4

这样做：

mCinemaTabAdapter.notifyDataSetChanged();
mCinemaTabAdapter.getItemPosition(0);

而不是：

mViewPager.getAdapter().notifyDataSetChanged();
mViewPager.getAdapter().getItemPosition(0);

Answer 5

在您的代码中执行此操作

adapter.notifyDataSetChanged();
adapter.getItemPosition(0);

它会帮助你。

Answer 6

尝试在适配器和方法showGetCinemasSuccess（data）{adapter.updateData（data）}中创建方法updateData（ArrayList mCinemasData）和。之后的notifyDataSetChange。

Android视图寻呼机中的数据未更新

6 个答案: