Question

我在Fragment活动中获取DatePickerFragment的信息时遇到问题。我有这个代码，摘自Google开发者页面：

public class DatePickerFragment extends DialogFragment {

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    // Use the current date as the default date in the picker
    final Calendar c = Calendar.getInstance();
    int year = c.get(Calendar.YEAR);
    int month = c.get(Calendar.MONTH);
    int day = c.get(Calendar.DAY_OF_MONTH);
    ADD add = new ADD();
    // Create a new instance of DatePickerDialog and return it
    return new DatePickerDialog(getActivity(), (DatePickerDialog.OnDateSetListener) add.getTargetFragment(), year, month, day);
}}

当我收到用户选择的日期时，这是我的MainActivity：

public  class ADD extends Fragment implements AdapterView.OnItemSelectedListener, DatePickerDialog.OnDateSetListener {
//code
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
    Log.w("DatePicker", "Date = " + year);
    mDateDisplay.setText(
            new StringBuilder()
                    // Month is 0 based so add 1
                    .append(dayOfMonth).append("-")
                    .append(monthOfYear + 1).append("-")
                    .append(year).append(" "));
}}

如果以前曾问过这个问题，我会道歉。我一直在这个页面中积极搜索，这个问题仅针对活动而不是片段进行了回答。另外，我必须指出，我不是Java专家。我的直觉告诉我，问题可能出在“回归”中。 DatePickerFragment，但我无法解决问题。

Answer 1

您可能忘记在setTargetFragment片段中触发ADD方法：

DatePickerFragment datePickerFragment = new DatePickerFragment();
datePickerFragment.setTargetFragment(this, 1234);
datePickerFragment.show(getChildFragmentManager(), "DatePickerFragment TAG");

另外用{：

替换onCreateDialog方法

final Calendar c = Calendar.getInstance();
int year = c.get(Calendar.YEAR);
int month = c.get(Calendar.MONTH);
int day = c.get(Calendar.DAY_OF_MONTH);
// Create a new instance of DatePickerDialog and return it
return new DatePickerDialog(getActivity(), (DatePickerDialog.OnDateSetListener) getTargetFragment(), year, month, day);

在Fragment活动上调用onDateSet

1 个答案: