在片段中显示 DatePickerDialog

Question

我正在创建一个具有 EditText 的片段，当我单击它时，会出现一个 DatePickerDialog .. 但是每当我单击 EditText 时我的应用程序就会崩溃..错误在这一行：    return new DatePickerDialog(getActivity(), (DatePickerDialog.OnDateSetListener) getActivity(), year, month, day);我的费用片段 Java 代码（仅限 datepick 代码）：@Nullable    @Override    public View onCreateView(final LayoutInflater inflater, final ViewGroup container,                             Bundle savedInstanceState) {        // Inflate the layout for this fragment        View view = inflater.inflate(R.layout.fragment_expense, container, false);            mDisplayDate = (EditText) view.findViewById(R.id.datePick);            mDisplayDate.setOnClickListener(new View.OnClickListener(){                @Override            public void onClick(View v) {                DialogFragment datePicker = new DatePickerFragment();                datePicker.show(getFragmentManager(), "date picker");            }        });        return view;    }    @Override    public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {        Calendar c = Calendar.getInstance();        c.set(Calendar.YEAR, year);        c.set(Calendar.MONTH, month);        c.set(Calendar.DAY_OF_MONTH, dayOfMonth);        String currentDate = DateFormat.getDateInstance().format(c.getTime());        dates = Integer.toString(dayOfMonth);        months = Integer.toString(month);        years = Integer.toString(year);        mDisplayDate.setText(currentDate);    }日期选择器片段 javapackage com.example.admin.test2;import android.app.DatePickerDialog;import android.app.Dialog;import android.os.Bundle;import android.support.annotation.NonNull;import android.support.annotation.Nullable;import android.support.v4.app.DialogFragment;import java.util.Calendar;

Answer 1

ExpenseFragment实现DatePickerDialog.OnDateSetListener，因此您需要使用getTargetFragment()而不是getActivity().

return new DatePickerDialog(getActivity(), (DatePickerDialog.OnDateSetListener) getTargetFragment(), year, month, day);

然后setTargetFragment在创建时使用DatePickerFragment.

mDisplayDate.setOnClickListener(new View.OnClickListener(){

    @Override

    public void onClick(View v) {

        DialogFragment datePicker = new DatePickerFragment();

        datePicker.setTargetFragment(ExpenseFragment.this, 0);

        datePicker.show(getFragmentManager(), "date picker");

    }

});

Answer 2

侦听器是在您的父 Fragment 中实现的，而不是您的父 Activity，因此您必须替换getActivity()为getParentFragment()

return new DatePickerDialog(getActivity(), (DatePickerDialog.OnDateSetListener) getParentFragment(), year, month, day);