获取日期使用dialogfragment日期选择器 [英] Get date from datepicker using dialogfragment

问题描述

我使用的是谷歌的例子使用dialogfragment
插在我的应用程序中的日期选择器 <一href="http://developer.android.com/guide/topics/ui/controls/pickers.html">http://developer.android.com/guide/topics/ui/controls/pickers.html

但我不知道怎么去后设置日期（不是Java专家）。对话和日期选择器运行正常，我可以登录的日期是correctely设置，但是，我该怎么做才能得到父母的活动执行的回调？

这是我的对话片段

 公共类DatePickerFragment扩展DialogFragment工具
        DatePickerDialog.OnDateSetListener {

    @覆盖
    公共对话onCreateDialog（包savedInstanceState）{
        //使用当前日期作为选择器的默认日期
        最后的日历C = Calendar.getInstance（）;
        INT年= c.get（Calendar.YEAR）;
        INT月= c.get（Calendar.MONTH）;
        INT天= c.get（Calendar.DAY_OF_MONTH）;

        //创建DatePickerDialog的新实例，并将其返回
        返回新DatePickerDialog（getActivity（），这，年，月，日）;
    }

    公共无效onDateSet（DatePicker的观点，年整型，INT月，日整型）{
        ** Log.w（DatePicker的，日期=+一年）**
    }
}
 

......我呼吁对话从我的活动与...

 公共无效showDatePickerDialog（视图v）{
    DialogFragment newFragment =新DatePickerFragment（）;
    newFragment.show（getSupportFragmentManager（），日期选择器）;
}
 

什么是叫我的父母，而不是活动的一个Log.w方法，正确的方法是什么？我想这是一些与传递一个回调的参数或东西，但大多数引用我发现在互联网上的相关约为previous版本，而dialogfragments

编辑：不知道，如果是重要的，但父活动被声明为：

 公共类EditSessionActivity扩展FragmentActivity {
 

解决方案：由于Lecho用户，这是要做到这一点

DatePickerFragmennt.class

 公共类DatePickerFragment扩展DialogFragment {

    @覆盖
    公共对话onCreateDialog（包savedInstanceState）{
        //使用当前日期作为选择器的默认日期
        最后的日历C = Calendar.getInstance（）;
        INT年= c.get（Calendar.YEAR）;
        INT月= c.get（Calendar.MONTH）;
        INT天= c.get（Calendar.DAY_OF_MONTH）;

        //创建DatePickerDialog的新实例，并将其返回
        返回新DatePickerDialog（getActivity（），（EditSessionActivity）getActivity（），年，月，日）;
    }

}
 

...和父活动EditSessionActivity.class ...

 公共类EditSessionActivity扩展FragmentActivity实现OnDateSetListener {
...
    @覆盖
    公共无效onDateSet（DatePicker的观点，年整型，INT月，日整型）{
        //做一些东西，例如写上活动日志和更新文本字段
        Log.w（DatePicker的，日期=+一年）;
        （（的EditText）findViewById（R.id.tf_date））的setText（日期=+一年）;
    }
 

解决方案

构造FO DatePickerDialog 需要 DatePickerDialog.OnDateSetListener 作为第二个参数，那么也许你应该实现该接口在父活动 EditSessionActivity （而不是在 DatePickerFragment ），并改变这种行：

 返回新DatePickerDialog（getActivity（），这，年，月，日）;
 

这个：

 返回新DatePickerDialog（getActivity（），（EditSessionActivity）getActivity（），年，月，日）;
 

和那么你应该活动看起来是这样的：

 公共类EditSessionActivity扩展FragmentActivity工具
        DatePickerDialog.OnDateSetListener {

    公共无效onDateSet（DatePicker的观点，年整型，INT月，日整型）{
        //使用日期您的活动
    }
    ...
}
 

I'm using the google example to insert a datepicker inside my app using a dialogfragment
http://developer.android.com/guide/topics/ui/controls/pickers.html

But I'm not sure how to get date after set it (not java expert). Dialog and datepicker runs ok and I can log that date is correctely set but, how can i do to get a callback executed on parent activity?

This is my Dialog fragment

public class DatePickerFragment extends DialogFragment implements
        DatePickerDialog.OnDateSetListener {

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the current date as the default date in the picker
        final Calendar c = Calendar.getInstance();
        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = c.get(Calendar.DAY_OF_MONTH);

        // Create a new instance of DatePickerDialog and return it
        return new DatePickerDialog(getActivity(), this, year, month, day);
    }

    public void onDateSet(DatePicker view, int year, int month, int day) {
        **Log.w("DatePicker","Date = " + year);**
    }
}

...and I call dialog from my activity with...

public void showDatePickerDialog(View v) {
    DialogFragment newFragment = new DatePickerFragment();
    newFragment.show(getSupportFragmentManager(), "datePicker");
}

What is the correct way to call a method in my parent activity instead Log.w? I suppose that is something related with passing a callback as parameter or something but most of references I found on internet are about previous versions without dialogfragments

EDIT: not sure if it's important but parent activity is declared as:

public class EditSessionActivity extends FragmentActivity {

SOLUTION: thanks to Lecho user this is the way to do it

DatePickerFragmennt.class

public class DatePickerFragment extends DialogFragment{

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the current date as the default date in the picker
        final Calendar c = Calendar.getInstance();
        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = c.get(Calendar.DAY_OF_MONTH);

        // Create a new instance of DatePickerDialog and return it
        return new DatePickerDialog(getActivity(), (EditSessionActivity)getActivity(), year, month, day);
    }

}

...and parent activity EditSessionActivity.class...

public class EditSessionActivity extends FragmentActivity implements OnDateSetListener {
...
    @Override
    public void onDateSet(DatePicker view, int year, int month, int day) {
        //do some stuff for example write on log and update TextField on activity
        Log.w("DatePicker","Date = " + year);
        ((EditText) findViewById(R.id.tf_date)).setText("Date = " + year);
    }

解决方案

Constructor fo DatePickerDialog takes DatePickerDialog.OnDateSetListener as second parameter, so maybe you should implement that interface in your parent activity EditSessionActivity (not in DatePickerFragment ) and change this line:

return new DatePickerDialog(getActivity(), this, year, month, day);

into this:

return new DatePickerDialog(getActivity(), (EditSessionActivity)getActivity(), year, month, day);

And then your activity should looks like this:

public class EditSessionActivity extends FragmentActivity implements
        DatePickerDialog.OnDateSetListener{

    public void onDateSet(DatePicker view, int year, int month, int day) {
        //use date in your activity
    }
    ...
}

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