TimePreference没有给出当前值

Question

我正在尝试从自定义TimePreference中获取值。设置mHour和mMinute变量之后，我将它们放在PreferenceFragment.java中的onPreferenceChange中。

对于代码墙感到抱歉，但我想为上下文提供一切。我相信我的问题是在TimePreference.onTimeChanged中发生的，如果你想专注于那里。

我遇到的问题是，每当我获得TimePreference.onTimeChanged中设置的值时，我就会得到之前设置的时间。例如，如果时钟当前设置为下午1:00，我将时间更改为下午3:15，它将读出13:00而不是15:15。

PreferenceFragment.java

 TimePreference timePicker = (TimePreference) findPreference("time");

    timePicker.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {

        @Override
        public boolean onPreferenceChange(Preference preference, Object newValue) {
            TimePreference timePreference = (TimePreference) preference;

            Long hour = timePreference.getHour();
            Long minutes = timePreference.getMinutes();

            Log.d(TAG, hour + " " + minutes);

            parent.setHour(hour);
            parent.setMinutes(minutes);
            return true;
        }
    });

TimePreference.java：

public class TimePreference extends DialogPreference implements TimePicker.OnTimeChangedListener {
    private Calendar mCalendar;
    private TimePicker picker = null;
    private long mHour;
    private long mMinutes;

    public TimePreference(Context ctxt) {
        this(ctxt, null);
    }

    public TimePreference(Context ctxt, AttributeSet attrs) {
        this(ctxt, attrs, android.R.attr.dialogPreferenceStyle);
    }

    public TimePreference(Context ctxt, AttributeSet attrs, int defStyle) {
        super(ctxt, attrs, defStyle);

        setPositiveButtonText(R.string.set);
        setNegativeButtonText(R.string.cancel);
        mCalendar = new GregorianCalendar();
    }

    public long getHour() {
        return mHour;
    }

    public long getMinutes() {
        return mMinutes;
    }

    @Override
    protected View onCreateDialogView() {
        picker = new TimePicker(getContext());
        picker.setOnTimeChangedListener(this);
        return (picker);
    }

    @Override
    protected void onBindDialogView(View v) {
        super.onBindDialogView(v);
        picker.setCurrentHour(mCalendar.get(Calendar.HOUR_OF_DAY));
        picker.setCurrentMinute(mCalendar.get(Calendar.MINUTE));
    }

    @Override
    protected void onDialogClosed(boolean positiveResult) {
        super.onDialogClosed(positiveResult);

        if (positiveResult) {
            mCalendar.set(Calendar.HOUR_OF_DAY, picker.getCurrentHour());
            mCalendar.set(Calendar.MINUTE, picker.getCurrentMinute());

            setSummary(getSummary());
            if (callChangeListener(mCalendar.getTimeInMillis())) {
                persistLong(mCalendar.getTimeInMillis());
                notifyChanged();
            }
        }
    }

    @Override
    protected Object onGetDefaultValue(TypedArray a, int index) {
        return (a.getString(index));
    }

    @Override
    protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {
        if (restoreValue) {
            long persistedValue;
            try {
                persistedValue = getPersistedLong(System.currentTimeMillis());
            } catch (Exception e) {
                //Stale persisted data may be the wrong type
                persistedValue = System.currentTimeMillis();
            }
            mCalendar.setTimeInMillis(persistedValue);
        } else if (defaultValue != null) {
            mCalendar.setTimeInMillis(Long.parseLong((String) defaultValue));
        } else {
            //!restoreValue, defaultValue == null
            mCalendar.setTimeInMillis(System.currentTimeMillis());
        }

        setSummary(getSummary());
    }

    @Override
    public CharSequence getSummary() {
        if (mCalendar == null) {
            return null;
        }
        return DateFormat.getTimeFormat(getContext()).format(new Date(mCalendar.getTimeInMillis()));
    }

    @Override
    public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
        mHour = hourOfDay;
        mMinutes = minute;
    }
}