我知道它的一晚答复，但我最近去通过相同的条件。因此，这里是我的答案，

在

 `DialogFragment.Show（FragmentManager经理，字符串标签））`
 

方法的片段本身设置标签。所以这个标签可以使用如下：

 片段dateTo = getActivity（）getSupportFragmentManager（）findFragmentByTag（dateTo）。;
            如果（dateTo！= NULL）{
                //做一点事            }
 

一个用例是可以显示更多然后一个片段的活动，并确定片段，你可以找到与鉴于片段tag.If不是null ，宾果！

I have 4 DatePicker Dialog in my Activity Class which are shown on click of 4 buttons . Now for these datePickerDialog i want to use same listener .

        DatePickerDialog taxPickerDialog = new DatePickerDialog(getCurrentContext(),dateSetListener,calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH),calendar.get(Calendar.DATE));
        taxPickerDialog.show();

        DatePickerDialog fcPickerDialog = new DatePickerDialog(getCurrentContext(),dateSetListener,calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH),calendar.get(Calendar.DATE));
        fcPickerDialog.show();
        break;

        DatePickerDialog expiryPickerDialog = new DatePickerDialog(getCurrentContext(),dateSetListener,calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH),calendar.get(Calendar.DATE));
        expiryPickerDialog.show();


        DatePickerDialog permitPickerDialog = new DatePickerDialog(getCurrentContext(),dateSetListener,calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH),calendar.get(Calendar.DATE));
        permitPickerDialog.show();

Now i want a use listener but dnot know how to implement this ???

DatePickerDialog.OnDateSetListener dateSetListener =new DatePickerDialog.OnDateSetListener() {

    @Override
    public void onDateSet(DatePicker view, int year, int month, int day) {
    switch(????){????}
}
};

I know its a late reply but i went through with the same condition recently . So here is my answer ,

the

`DialogFragment.Show(FragmentManager manager, String tag))`

method is set tag for Fragment itself . so this tag can be use as follows :

Fragment dateTo=getActivity().getSupportFragmentManager().findFragmentByTag("dateTo");
            if(dateTo!=null){
                //do something

            } 

one use case is you can display more then one Fragment in a activity and to identify the fragment you can find that fragment with the given tag.If it is not null, bingo!!!