不調用覆蓋父接口方法的子類

Question

我有一個自定義的TimePickerDialog，它從Android的擴展。該對話框有一個接口OnTimeSetListener，必須通過Context或父Fragment來實現。

CustomTimePickerDialog.java

public class CustomTimePickerDialog extends DialogFragment implements 
     android.app.TimePickerDialog.OnTimeSetListener { 

    ... 

    private OnTimeSetListener listener; 

    public static TimePickerDialog newInstance(int hour, int minutes) { 
     TimePickerDialog fragment = new TimePickerDialog(); 

     return fragment; 
    } 

    @NonNull 
    @Override 
    public Dialog onCreateDialog(Bundle savedInstanceState) { 
     return new android.app.TimePickerDialog(getContext(), this, 0, 0, true); 
    } 

    @Override 
    public void onTimeSet(TimePicker timePicker, int hour, int minutes) { 
     listener.onTimeSet(hour, minutes); 
    } 

    @Override 
    public void onAttach(Context context) { 
     super.onAttach(context); 

     Object parent = getParentFragment() == null 
       ? context 
       : getParentFragment(); 

     if (parent instanceof OnTimeSetListener) { 
      listener = ((OnTimeSetListener) parent); 
     } else { 
      throw new RuntimeException(parent + " must implement OnTimeSetListener"); 
     } 
    } 

    public interface OnTimeSetListener { 
     void onTimeSet(int hour, int minutes); 
    } 
} 

的問題是，我需要再次擴展此類改變onTimeSet()行爲，像這樣：

LimitedCustomTimePickerDialog.java

public class LimitedCustomTimePickerDialog extends CustomTimePickerDialog { 

    @Override 
    public void onTimeSet(TimePicker timePicker, int hour, int minutes) { 
     int standardMinutes = minutes < 30 ? 0 : 30; 
     super.onTimeSet(timePicker, hour, standardMinutes); 
    } 

} 

但它從來沒有calle d！我怎樣才能做到這一點？

Answer 1

你實現了接口兩側的接口，所以誰打電話給onTimeSet？只需實施你想使用這種方法的地方。