首选项屏幕中的DialogPreference摘要

Question

嗨！

我有一个包含DialogPreference的首选项屏幕。 当首选项屏幕变得可见时，我希望DialogPreference具有当前时间作为摘要。 如何做到这一点？ 可以通过xml完成​​，但我无法在xml文件中设置当前时间。 我试图在onSetInitialValue方法中设置摘要，但由于未显示摘要，因此它似乎不起作用。

这是我的代码：（在下面的示例中，我使用的是随机文本字符串而不是当前时间，因此我不必粘贴用于计算时间的long函数）。

public class TimePreference extends DialogPreference {

  private TimePicker timePicker;
  Calendar calendar = Calendar.getInstance();
  private int hour = calendar.get(Calendar.HOUR_OF_DAY);
  private int minute = calendar.get(Calendar.MINUTE);


  public TimePreference(Context context, AttributeSet attributes) {
    super(context, attributes);
    setPersistent(false);
    //setSummary(getFormatedTime(hour, minute));
  }

  /**
   * Initialize time picker to currently stored time preferences.
   * 
   * @param view
   * The dialog preference's host view
   */
  @Override
  public void onBindDialogView(View view) {
    super.onBindDialogView(view);
    timePicker = (TimePicker) view.findViewById(R.id.time_picker);
    timePicker.setIs24HourView(DateFormat.is24HourFormat(timePicker.getContext()));
    timePicker.setCurrentHour(hour);
    timePicker.setCurrentMinute(minute);
  }

  /**
   * Handles closing of dialog. If user intended to save the settings, selected
   * hour and minute are stored in the preferences with keys KEY.hour and
   * KEY.minute, where KEY is the preference's KEY.
   * 
   * @param okToSave
   * True if user wanted to save settings, false otherwise
   */
  @Override
  protected void onDialogClosed(boolean okToSave) {
    super.onDialogClosed(okToSave);

    if (okToSave) {
      timePicker.clearFocus();
      SharedPreferences.Editor editor = getEditor();
      hour = timePicker.getCurrentHour();
      minute = timePicker.getCurrentMinute();
      editor.putInt(getKey() + ".hour", hour);
      editor.putInt(getKey() + ".minute", minute);
      editor.commit();

      setSummary(getFormatedTime(hour, minute));
    }

  }

  @Override
    protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {
      super.onSetInitialValue(restoreValue, defaultValue);
      setSummary("current time here!"); // THIS IS NEVER SHOWN ?? WHY ? 
  }

}

非常感谢你！

Answer 1

在onCreate之后的addPreferencesFromResource

Preference dialogPref = findPreference(ID for dialog in xml);
dialogPref.setSummary(current time here);