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I am creating a fragment that have a EditText that when I clicked it, there will be a DatePickerDialog showing up.. but my app is crashing whenever I click the EditText..

The Error is in this line:

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

My expense FRAGMENT Java codes (the datepick codes only):

@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);

 

DatePickerFragment java

package 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;

public class DatePickerFragment extends DialogFragment 

 @NonNull
 @Override
 public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) 
 Calendar c = Calendar.getInstance();
 int year = c.get(Calendar.YEAR);
 int month = c.get(Calendar.MONTH);
 int day = c.get(Calendar.DAY_OF_MONTH);

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

THE ERROR

E/AndroidRuntime: FATAL EXCEPTION: main
 Process: com.example.admin.test2, PID: 25901
 java.lang.ClassCastException: com.example.admin.test2.ScreenOne cannot be cast to android.app.DatePickerDialog$OnDateSetListener
 at com.example.admin.test2.DatePickerFragment.onCreateDialog(DatePickerFragment.java:22)
 at android.support.v4.app.DialogFragment.onGetLayoutInflater(DialogFragment.java:330)
 at android.support.v4.app.Fragment.performGetLayoutInflater(Fragment.java:1308)
 at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1460)
 at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1784)
 at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1852)
 at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:802)
 at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2625)
 at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2411)
 at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2366)
 at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2273)
 at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:733)
 at android.os.Handler.handleCallback(Handler.java:789)
 at android.os.Handler.dispatchMessage(Handler.java:98)
 at android.os.Looper.loop(Looper.java:164)
 at android.app.ActivityThread.main(ActivityThread.java:6944)
 at java.lang.reflect.Method.invoke(Native Method)
 at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)

ExpenseFragment implements DatePickerDialog.OnDateSetListener, so you need to use getTargetFragment() instead of getActivity().

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

Then use setTargetFragment when creating 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");
 
);

The listener is implemented in your parent Fragment, not your parent Activity, so you have to replace getActivity() with getParentFragment()

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