我真的很难过,我迫切希望找到解决方案:
我正在为我的应用程序中的片段使用 ABS 库。
这是onCreateView
我的片段类中的方法:
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
view = inflater.inflate(R.layout.details_fragment, container, false);
prefs = getSherlockActivity().getSharedPreferences(prefName, getSherlockActivity().MODE_PRIVATE);
day = Integer.parseInt(prefs.getString(BIRTH_KEY, "").substring(0, 2));
month = Integer.parseInt(prefs.getString(BIRTH_KEY, "").substring(3, 5));
year = Integer.parseInt(prefs.getString(BIRTH_KEY, "").substring(6, 10));
name = (TextView)view.findViewById(R.id.nameEdit);
age = (TextView)view.findViewById(R.id.ageEdit);
name.setText(prefs.getString(FIRST_NAME_KEY, "") + " " + prefs.getString(LAST_NAME_KEY, ""));
age.setText(getAge(year, month, day) + " years");
age.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
showDatePickerDialog();
}
});
return view;
}
public void update() {
System.out.println(getView());
}
这个 DateDialogPicker 类:
public class DatePickerFragment extends SherlockDialogFragment implements OnDateSetListener {
private SharedPreferences prefs;
private String prefName = "UserPref";
private static final String BIRTH_KEY = "date_of_birth";
private Date dateObj;
private FragmentDetails frag;
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
// TODO Auto-generated method stub
prefs = getSherlockActivity().getSharedPreferences(prefName, getSherlockActivity().MODE_PRIVATE);
frag = new FragmentDetails();
final Calendar c = Calendar.getInstance();
int day = Integer.parseInt(prefs.getString(BIRTH_KEY, "").substring(0, 2));
int month = (Integer.parseInt(prefs.getString(BIRTH_KEY, "").substring(3, 5))-1);
int year = Integer.parseInt(prefs.getString(BIRTH_KEY, "").substring(6, 10));
return new DatePickerDialog(getSherlockActivity(), this, year, month, day);
}
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear,
int dayOfMonth) {
// TODO Auto-generated method stub
String _date = (dayOfMonth + "/" + (monthOfYear+1) + "/" + year);
SharedPreferences.Editor editor = prefs.edit();
editor.putString(BIRTH_KEY, formatDate(_date));
editor.commit();
FragmentDetails frag = new FragmentDetails();
frag.update();
}
private String formatDate(String date) {
SimpleDateFormat curFormater = new SimpleDateFormat("dd/MM/yyyy");
try {
dateObj = curFormater.parse(date);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return (curFormater.format(dateObj));
}
}
一切正常。但是我想通过在方法中调用 FragmentDetails 类的更新方法来更新日期集上片段的文本视图onDateSet
。但是使用视图或方法访问 textview 会getView()
返回空指针异常。
在这种情况下,方法update()
打印getView()
并且其结果为空。
如何获取片段的视图,以便我可以访问和管理该视图的文本视图。
编辑
到目前为止,我发现我可以在片段实例中访问片段的任何视图,但是当我创建一个新对话框时,我无法getView
从对话框实例中访问该片段。