我使用寻呼机enter link description here
的示例我已经解决了所有问题,但有一个问题。我有4个不同的片段。其中一个包含ListView。当我单击ListView中的项目时,更改全局变量guestId
。如果然后返回其他片段,则应更改它们。因为他们使用此变量作为参数。但他们没有改变。
public class Guest extends Fragment {
...
private ViewPager pager;
private MyPagerAdapter adapter;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.guest, null);
...
if (InternetResiver.isOnline(getActivity())) {
setData();
} else {
AlertDialog alert = InternetResiver.getAlertDialog(getActivity());
alert.show();
}
return v;
}
public void startNewTread(String newId) {
guestId = newId;
Log.d("usernewid",newId);
setData();
}
private class MyPagerAdapter extends FragmentPagerAdapter {
public MyPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int pos) {
switch(pos) {
case 0: return Folio.newInstance(guestId,hotel,room);
case 1: return BalanceDetail.newInstance(guestId,hotel);
case 2: return History.newInstance(guestId,hotel);
case 3: return Record.newInstance(guestId,hotel,room);
default: return Folio.newInstance(guestId,hotel,room);
}
}
@Override
public int getCount() {
return 4;
}
}
public void setData() {
String link = String.format(......., guestId, hotel);
new MyAsincTask(getActivity()){........}.execute(link);
}
}
我的片段
public class Folio extends Fragment {
private ArrayList<FolioBean> folioBeans;
private TableLayout tableFolio;
private String guestId;
private String hotel;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.folio, null);
guestId = getArguments().getString("guestid");
hotel = getArguments().getString("hotel");
folioBeans = new ArrayList<>();
tableFolio = (TableLayout) v.findViewById(R.id.tableFolio);
if (InternetResiver.isOnline(getActivity())) {
setData();
} else {
AlertDialog alert = InternetResiver.getAlertDialog(getActivity());
alert.show();
}
return v;
}
public static Folio newInstance(String guestid,String hotel,String room) {
Folio f = new Folio();
Bundle b = new Bundle();
b.putString("guestid", guestid);
b.putString("hotel", hotel);
b.putString("room", room);
f.setArguments(b);
return f;
}
public void setData() {
String link = String.format(........., guestId, hotel);
new MyAsincTask(getActivity()){........}.execute(link);
}
}
使用相同的guestId
答案 0 :(得分:1)
这是因为ViewPager缓存了片段。您需要使用FragmentStatePagerAdapter而不是FragmentPagerAdapter
,并在更改notifydatasetchanged()
后调用guestId
,并覆盖
在PagerAdapter中覆盖getItemPosition,如下所示:
@Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
看到类似的问题
Refresh images on FragmentStatePagerAdapter on resuming activity