如何设置在DatePickerDialog在我的片段从主机活动的默认日期？ [英] How do I set the default date in a DatePickerDialog in my fragment from the host activity?

问题描述

因此​​，我创建了一个活动日历对象c和设置时间为2016年2月29日，我想要的片段对话加载日期作为默认日期。我缺少的是在这里吗？我是否需要删除片段日历对象CAL？如果是这样，在片段onCreateDialog怎么办我引用或获得（）从set（）方法在活动日期？

从活动文件：

  @覆盖
保护无效的onCreate（捆绑savedInstanceState）{
    ...
    最后的日历C = Calendar.getInstance（）;
    c.set（Calendar.YEAR，2016年）;
    c.set（的Calendar.MONTH，1）;
    c.set（Calendar.DAY_OF_MONTH，29）;    DialogFragment newFragment =新DatePickerFragment（）;
    newFragment.show（getSupportFragmentManager（），日期选择器）;
 

从片段文件：

  ...
@覆盖
公共对话框onCreateDialog（捆绑savedInstanceState）{        日历CAL = Calendar.getInstance（）;        currentyear = cal.get（Calendar.YEAR）;
        currentmonth = cal.get（的Calendar.MONTH）;
        CURRENTDAY = cal.get（Calendar.DAY_OF_MONTH）;        DatePickerDialog dateDialog =新DatePickerDialog（this.getActivity（），这一点，currentyear，currentmonth，CURRENTDAY）;
       返回dateDialog;
 

解决方案

的日历ç您在活动设置是从日历不同的CAL 在你的片段，它们是两个不同的实例。

我建议你使用过的年，月，日的片段捆绑，所以你会想要去的：

捆绑数据=新包（）;
data.putInt（...，...）; //
DialogFragment DF =新DialogFragment（）;
df.setArguments（数据）;

然后在你的 onCreateDialog 中的片段，利用检索数据：

 年整型= getArguments（...）;
 

So I created a calendar object "c" in the Activity and set the date to February 29, 2016. I want the fragment dialog to load that date as the default date. What am I missing here? Do I need to delete the fragment calendar object 'cal'? If so, in the fragment onCreateDialog how do I reference or get() the date from the set() method in the Activity?

from Activity file:

@Override
protected void onCreate(Bundle savedInstanceState) {
    ...
    final Calendar c = Calendar.getInstance();
    c.set(Calendar.YEAR, 2016);
    c.set(Calendar.MONTH, 1);
    c.set(Calendar.DAY_OF_MONTH, 29);

    DialogFragment newFragment = new DatePickerFragment();
    newFragment.show(getSupportFragmentManager(), "datePicker");

from the Fragment file:

...
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {

        Calendar cal = Calendar.getInstance();

        currentyear = cal.get(Calendar.YEAR);
        currentmonth = cal.get(Calendar.MONTH);
        currentday = cal.get(Calendar.DAY_OF_MONTH);

        DatePickerDialog dateDialog = new DatePickerDialog(this.getActivity(), this, currentyear,currentmonth,currentday);
       return dateDialog;

解决方案

The Calendar c you set in your Activity is different from the Calendar cal in your fragment, they are two different instances.

I suggest you pass the year, month and day to the fragment using a Bundle, so you would want to go:

Bundle data = new Bundle(); data.putInt("...", "..."); // DialogFragment df = new DialogFragment(); df.setArguments(data);

Then in your onCreateDialog in the fragment, retrieve the data using:

int year = getArguments("...");

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