Question

我有一个片段。该片段包含一个视图寻呼机，其中视图页面有多个片段。我可以滚动页面但看不到任何内容，即使getItem在滚动并初始化片段时调用了它。

我已使用support.v4.app.Fragment和support.v4.app.FragmentManager更改了代码，并将主要活动更改为FragmentActivity。另外，我使用getChildFragmentManager到适配器但仍然无法显示任何内容。

我也改变下面的行总是返回true但它可以显示第一个片段。当开始分页时，后续片段不会显示并且表现不佳。

@Override
public boolean isViewFromObject(View view, Object object) {
    return true;
}

以下是我实施ViewPager的代码。

public class AppsPagerAdapter extends FragmentPagerAdapter {

private int appsSize;
private int appsPerPage = 12;
private Activity activity;

public AppsPagerAdapter (Activity activity1, FragmentManager manager, int size)
{
    super(manager);
    appsSize = size;
    activity = activity1;
}

@Override
public int getCount() {
    int offset = appsSize % appsPerPage;
    int pageExtra = (offset > 0)? 1: 0;
    return appsSize / appsPerPage + pageExtra;
}

@Override
public boolean isViewFromObject(View view, Object object) {
    return view == object;
}

public Fragment getItem(int position) {
    Bundle bundle = new Bundle();
    bundle.putInt (AppPageFragment.PAGE_NUMBER_PARAMS, position);
    return Fragment.instantiate(activity, AppPageFragment.class.getName(), bundle);
}

}

外片段：

       @Override
    public View onCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        View view = inflater.inflate (R.layout.fragment_all_app, container, false);

        ViewPager appsPager = (ViewPager) view.findViewById(R.id.grid_allapps);
        //adapter = new AppsPagerAdapter(((AppCompatActivity)getActivity()).getSupportFragmentManager(), GlobalData.getInstance().getApps().getAll().size());
        adapter = new AppsPagerAdapter(getActivity(), getChildFragmentManager(), GlobalData.getInstance().getApps().getAll().size());
        appsPager.setAdapter(adapter);

        appsPager.addOnPageChangeListener(pageChangeListener);
        return view;

Android：ViewPager中的碎片未显示

0 个答案: