如何更改TabLayout中当前片段的数据?
问题描述:
如何动态更改TabLayout
中当前的fragment
的内容。例如,如果当前片段上有一个列表,并且列表已更改,那么如何更新片段布局?如何更改TabLayout中当前片段的数据?
这里是默认生成的代码(从New
选择>>Activity
>>Tabbed Activity
)
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;
}
}
答
你的问题是不是每说一个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如何创建一个自定义的。
不过长话短说,你将需要:
要么使用
ArrayAdapter
(作为似乎在this question),或创建自己的,如上所述在我的答案。每次修改适配器/集,调用该方法
myAdapter#notifyDataSetChanged();
你能不能对你有什么做更具体一点? – Mauker
@Mauker我有一个ArrayList和ListView,当ArrayList被更改时,我想在当前片段上显示已更改的ArrayList –