android - 未调用 OnPreferenceChangeListener

Question

我正在尝试在用户单击首选项并在摘要中显示所选日期时启动日期选择器 fragment 。

但是，当首选项值更改时，不会调用 OnPreferenceChangeListener。我确认该值确实发生了变化。

我做错了吗？

这是设置 fragment

// Configure setting start date
    Preference startDatePref = findPreference(getString(R.string.pref_start_date));
    startDatePref.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {

        @Override
        public boolean onPreferenceClick(Preference preference) {
            DialogFragment startFragment = DatePickerFragment.newInstance(DatePickerFragment.PICK_START);
            startFragment.show(((AppCompatActivity) getActivity()).getSupportFragmentManager(), "Pick Start Date of Semester");
            return true;
        }
    });
    // Update the summary when date is picked
    startDatePref.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
        @Override
        public boolean onPreferenceChange(Preference preference, Object newValue) {
            preference.setSummary(newValue.toString());
            Log.d("pref change", "called!");
            return true;
        }
    });

日期选择器

public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
    SharedPreferences pref = getActivity().getSharedPreferences(
            getActivity().getString(R.string.date_info_file), Activity.MODE_PRIVATE);
    SharedPreferences.Editor editor = pref.edit();
    if (mType == PICK_START) {
        editor.putInt(getString(R.string.start_date_year), year);
        editor.putInt(getString(R.string.start_date_month), monthOfYear);
        editor.putInt(getString(R.string.start_date_day), dayOfMonth);
        UniData.setDataStatus(getActivity(), UniData.START_DATE, true);

        // Change the preference used in preferences.xml so that the onChange listener will be called
        SharedPreferences defaultPref = PreferenceManager.getDefaultSharedPreferences(getContext());
        SharedPreferences.Editor editDefault = defaultPref.edit();
        editDefault.putString(getString(R.string.pref_start_date), year + "-" + (monthOfYear + 1) + "-" + dayOfMonth);
        editDefault.commit();

        Log.d(LOG_TAG, "Start Picked: " + year + " " + monthOfYear + " " + dayOfMonth);
    }
    ... 
    editor.commit();

首选项.xml

<PreferenceCategory
    android:key="pref_key_schedule_settings"
    android:title="Schedule">
    <Preference
        android:defaultValue=""
        android:key="pref_start_date"
        android:summary="For the app to determine odd and even week."
        android:title="Set start date of semester"/>
</PreferenceCategory>

Answer 1

我遇到了类似的问题，通过在我的自定义首选项中调用 callChangeListener(myNewValue); 解决了这个问题，例如:

@Override
protected void onDialogClosed(boolean positiveResult) {
    super.onDialogClosed(positiveResult);
    if (positiveResult && mSelectedDate != null) {
        persistDate(mSelectedDate);
        callChangeListener(mSelectedDate);
    }
}

希望对你有帮助