从自定义DatePicker DialogPreference调用自定义时间DialogPreference

我需要在我的项目中实现自定义TimePicker和DatePicker DialogPreferences。应调用第一个DatePicker对话框，然后调用TimePicker。我在this和this教程的帮助下将它们都实施到了我的项目中。从自定义DatePicker DialogPreference调用自定义时间DialogPreference

我认为我应该在DatePreference的onDialogClosed方法中调用TimePreference。我那样做：

@Override 
protected void onDialogClosed(boolean shouldSave) { 
    if (shouldSave && this.changedValueCanBeNull != null) { 
     setTheDate(this.changedValueCanBeNull); 
     this.changedValueCanBeNull = null; 
     Log.i("curr context", ctx.getClass().toString()); 
     try{ 

      new TimePreference(ctx,attrs).getDialog().show(); 
     } 
     catch(Exception e) 
     { 
      e.printStackTrace(); 
     } 
    } 
}

但我得到一个NullPointerException异常。问题是如何在DatePreference工作之后以编程方式调用我的自定义TimePreference对话框，并将这两个值都设置为DatePreference。或者我应该创建不同的自定义ListPreference应该实现这两个项目？

来源

2013-02-20 Rikki Tikki Tavi

我创建了自定义视图，它看起来像ListPreference并实现了这个解决方案。

private TimePickerDialog.OnTimeSetListener mTimeSetListener = new TimePickerDialog.OnTimeSetListener() { 
      public void onTimeSet(TimePicker view, int hourOfDay, int minuteOfHour) { 
       mHour = hourOfDay; 
       mMinute = minuteOfHour; 
       updateDisplay(); 

      } 
      }; 

      DatePickerDialog.OnDateSetListener mDateSetListener = 
        new DatePickerDialog.OnDateSetListener() { 
        public void onDateSet(DatePicker view, int year, int monthOfYear, 
            int dayOfMonth) { 
          mYear = year; 
          mMonth = monthOfYear; 
          mDay = dayOfMonth; 

          updateDisplay(); 
        } 
      }; 


@Override 
     protected Dialog onCreateDialog(int id) { 
       switch (id) { 
       case DATE_DIALOG_ID: 
         return new DatePickerDialog(this, 
           mDateSetListener, 
           mYear, mMonth, mDay); 

       case TIME_DIALOG_ID: 
        return new TimePickerDialog(this, mTimeSetListener, mHour, mMinute, 
         false); 
       } 
       return null; 
     } 
     protected void onPrepareDialog(int id, Dialog dialog) { 
       switch (id) { 
       case DATE_DIALOG_ID: 
         ((DatePickerDialog) dialog).updateDate(mYear, mMonth, mDay); 
         break;} 
       } 
     private void updateDisplay() { 
      String minutes = null; 
      if (mMinute>9) 
       minutes = Integer.toString(mMinute); 
      else 
       minutes = "0"+Integer.toString(mMinute); 
      if (mMonth<10) 
      deadlineCus.setSummary(
        (new StringBuilder() 
        // Month is 0 based so add 1 
        .append(mYear).append("-").append("0") 
        .append(mMonth + 1).append("-") 
        .append(mDay) 
        .append(" ").append(mHour).append(":").append(minutes)).toString() 
        ); 
      else 
       deadlineCus.setSummary(
         (new StringBuilder() 
         // Month is 0 based so add 1 
         .append(mYear).append("-") 
         .append(mMonth + 1).append("-") 
         .append(mDay) 
         .append(" ").append(mHour).append(":").append(minutes)).toString() 
         ); 
      showDialog(TIME_DIALOG_ID); 

    }

中的onCreate

（）方法：

DatePickerDialog.OnDateSetListener mDateSetListener = 
        new DatePickerDialog.OnDateSetListener() { 
        public void onDateSet(DatePicker view, int year, int monthOfYear, 
            int dayOfMonth) { 
          mYear = year; 
          mMonth = monthOfYear; 
          mDay = dayOfMonth; 

          updateDisplay(); 
        } 


      }; 
      TimePickerDialog.OnTimeSetListener mTimeSetListener = new TimePickerDialog.OnTimeSetListener() { 
       public void onTimeSet(TimePicker view, int hourOfDay, int minuteOfHour) { 
        mHour = hourOfDay; 
        mMinute = minuteOfHour; 
        updateDisplay(); 

       } 
       }; 

    deadlineCus.setOnTouchListener(new OnTouchListener() 
     { 

     public boolean onTouch(View arg0, MotionEvent arg1) 

     { 
       showDialog(DATE_DIALOG_ID); 
       return false; 
     } 

     });

来源

2013-03-15 13:16:06

从自定义DatePicker DialogPreference调用自定义时间DialogPreference

回答

相关问题