Question

如何动态更改fragment中当前TabLayout的内容。例如，如果当前片段上有列表，并且列表已更改，那么如何更新片段布局？

以下是默认生成的代码（从New＆gt;＆gt; Activity＆gt;＆gt; Tabbed Activity中选择）

 public static class PlaceholderFragment extends Fragment {
    /**
     * The fragment argument representing the section number for this
     * fragment.
     */
    private static final String ARG_SECTION_NUMBER = "section_number";

    public PlaceholderFragment() {
    }

    /**
     * Returns a new instance of this fragment for the given section
     * number.
     */
    public static PlaceholderFragment newInstance(int sectionNumber) {
        PlaceholderFragment fragment = new PlaceholderFragment();
        Bundle args = new Bundle();
        args.putInt(ARG_SECTION_NUMBER, sectionNumber);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_main, container, false);
        TextView textView = (TextView) rootView.findViewById(R.id.section_label);
        int areaID = getArguments().getInt(ARG_SECTION_NUMBER);
        textView.setText(getString(R.string.section_format, areaID));
        return rootView;
    }
}

/**
 * A {@link FragmentPagerAdapter} that returns a fragment corresponding to
 * one of the sections/tabs/pages.
 */
public class SectionsPagerAdapter extends FragmentPagerAdapter {

    public SectionsPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
        // getItem is called to instantiate the fragment for the given page.
        // Return a PlaceholderFragment (defined as a static inner class below).
        return PlaceholderFragment.newInstance(position + 1);
    }

    @Override
    public int getCount() {
        // Show 3 total pages.
        return 3;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        switch (position) {
            case 0:
                return "SECTION 1";
            case 1:
                return "SECTION 2";
            case 2:
                return "SECTION 3";
        }
        return null;
    }
}

Answer 1

您的问题不是Fragment问题。由于您使用的是ListView，因此您可以使用预定义的适配器，也可以创建自己的自定义适配器。检查this answer of mine有关如何创建自定义帐户的信息。

但长话短说，你需要：

使用ArrayAdapter（如this question所示）或创建自己的，如上所述。
每次修改适配器/数据集时，请调用方法myAdapter#notifyDataSetChanged();

如何在TabLayout中更改当前片段的数据？

1 个答案: