Two DatePickerDialog in the same Activity of Android. Use inner class for conveniention. Use a flag to detect which EditText should be change.

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context="com.edinstudio.app.samples.datepicker.MainActivity">

    <EditText
        android:id="@+id/start_date"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:focusable="false"
        android:hint="Please pick a date" />

    <EditText
        android:id="@+id/end_date"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/start_date"
        android:focusable="false"
        android:hint="Please pick a date" />

</RelativeLayout>

MainActivity.java

package com.edinstudio.app.samples.datepicker;

import android.app.DatePickerDialog;
import android.app.Dialog;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.DatePicker;
import android.widget.EditText;

import java.text.SimpleDateFormat;
import java.util.Calendar;


public class MainActivity extends ActionBarActivity implements View.OnClickListener {
    private EditText mStartTime;
    private EditText mEndTime;

    private DatePickerDialogFragment mDatePickerDialogFragment;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mStartTime = (EditText) findViewById(R.id.start_date);
        mEndTime = (EditText) findViewById(R.id.end_date);
        mDatePickerDialogFragment = new DatePickerDialogFragment();

        mStartTime.setOnClickListener(this);
        mEndTime.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        int id = v.getId();
        if (id == R.id.start_date) {
            mDatePickerDialogFragment.setFlag(DatePickerDialogFragment.FLAG_START_DATE);
            mDatePickerDialogFragment.show(getSupportFragmentManager(), "datePicker");
        } else if (id == R.id.end_date) {
            mDatePickerDialogFragment.setFlag(DatePickerDialogFragment.FLAG_END_DATE);
            mDatePickerDialogFragment.show(getSupportFragmentManager(), "datePicker");
        }
    }

    public class DatePickerDialogFragment extends DialogFragment implements
            DatePickerDialog.OnDateSetListener {
        public static final int FLAG_START_DATE = 0;
        public static final int FLAG_END_DATE = 1;

        private int flag = 0;

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

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

        public void setFlag(int i) {
            flag = i;
        }

        @Override
        public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
            Calendar calendar = Calendar.getInstance();
            calendar.set(year, monthOfYear, dayOfMonth);
            SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
            if (flag == FLAG_START_DATE) {
                mStartTime.setText(format.format(calendar.getTime()));
            } else if (flag == FLAG_END_DATE) {
                mEndTime.setText(format.format(calendar.getTime()));
            }
        }
    }
}

How to calculate the number of days in between these two dates.It will be a great Help.

Use the Following Code @pritz10
long difference = Math.abs(format.parse(mStartTime).getTime() - format.parse(mEndTime).getTime())/86400000;

hi,first of all thank you for this code,it is great code! i added this code to my project but i have error log cat says this;

java.lang.IllegalStateException: Fragment com.sener35gmail.burak.myapplication.AddDeceasedInfo.DatePickerDialogFragment must be a public static class to be properly recreated from instance state.
at com.sener35gmail.burak.myapplication.AddDeceasedInfo.onClick(AddDeceasedInfo.java:76)
it indicates this part of code ;
@OverRide
public void onClick(View v) {

    switch (v.getId()) {
        case R.id.DateofBirth:

            mDatePickerDialogFragment.setFlag(DatePickerDialogFragment.FLAG_START_DATE);
            mDatePickerDialogFragment.show(getSupportFragmentManager(), "datePicker");
            break;
        case R.id.DateofDeath:
            mDatePickerDialogFragment.setFlag(DatePickerDialogFragment.FLAG_END_DATE);
            mDatePickerDialogFragment.show(getSupportFragmentManager(), "datePicker"); //log cat show that this line is cause of error (code crash)
            break;
    }
}

If you could help me,i would be thankful :)

man you save me 👍

Thanks! -)

Thank you boss

hi,first of all thank you for this code,it is great code! i added this code to my project but i have error log cat says this;

java.lang.IllegalStateException: Fragment com.sener35gmail.burak.myapplication.AddDeceasedInfo.DatePickerDialogFragment must be a public static class to be properly recreated from instance state. at com.sener35gmail.burak.myapplication.AddDeceasedInfo.onClick(AddDeceasedInfo.java:76)
it indicates this part of code ;
@OverRide
public void onClick(View v) {

    switch (v.getId()) {
        case R.id.DateofBirth:

            mDatePickerDialogFragment.setFlag(DatePickerDialogFragment.FLAG_START_DATE);
            mDatePickerDialogFragment.show(getSupportFragmentManager(), "datePicker");
            break;
        case R.id.DateofDeath:
            mDatePickerDialogFragment.setFlag(DatePickerDialogFragment.FLAG_END_DATE);
            mDatePickerDialogFragment.show(getSupportFragmentManager(), "datePicker"); //log cat show that this line is cause of error (code crash)
            break;
    }
}

If you could help me,i would be thankful :)

i

hi,first of all thank you for this code,it is great code! i added this code to my project but i have error log cat says this;

java.lang.IllegalStateException: Fragment com.sener35gmail.burak.myapplication.AddDeceasedInfo.DatePickerDialogFragment must be a public static class to be properly recreated from instance state. at com.sener35gmail.burak.myapplication.AddDeceasedInfo.onClick(AddDeceasedInfo.java:76)
it indicates this part of code ;
@OverRide
public void onClick(View v) {

    switch (v.getId()) {
        case R.id.DateofBirth:

            mDatePickerDialogFragment.setFlag(DatePickerDialogFragment.FLAG_START_DATE);
            mDatePickerDialogFragment.show(getSupportFragmentManager(), "datePicker");
            break;
        case R.id.DateofDeath:
            mDatePickerDialogFragment.setFlag(DatePickerDialogFragment.FLAG_END_DATE);
            mDatePickerDialogFragment.show(getSupportFragmentManager(), "datePicker"); //log cat show that this line is cause of error (code crash)
            break;
    }
}

If you could help me,i would be thankful :)

mDatePickerDialogFragment.show(getSupportFragmentManager(), "datePicker"); why my app crashes on this line of code i put it in try catch that stopped crash but it never worked