未調用OnPreferenceChangeListener

Question

當用戶單擊首選項並在摘要中顯示所選日期時，我正在嘗試啟動日期選擇器片段。

但是，當首選項值更改時，不會調用OnPreferenceChangeListener。 我確認該值確實發生了變化。

我做錯了嗎？

這是SettingsFragment

// 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;
        }
    });

日期選擇器

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();

的preferences.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

我有一個類似的問題，可以通過調用callChangeListener(myNewValue);來解決callChangeListener(myNewValue); 在我的自定義首選項中，例如：

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

希望這可以幫助