Develop Reference

How do I subtract two date pickers in Android?

I have two date pickers in my app (fromDate and toDate). When the user selects and sets both dates from these two date pickers, I want my app to automatically show the number of days between them in another edit text (days) box.
How can I do it?

First add OnDateChangedListener for both of the date pickers as
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
fromDate.init(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH), new DatePicker.OnDateChangedListener() {
#Override
public void onDateChanged(DatePicker datePicker, int year, int month, int dayOfMonth) {
UpdateText();
}
});
toDate.init(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH), new DatePicker.OnDateChangedListener() {
#Override
public void onDateChanged(DatePicker datePicker, int year, int month, int dayOfMonth) {
UpdateText();
}
});
Create a function UpdateText to update the EditText days
private void UpdateText() {
Calendar localCalendar = Calendar.getInstance(TimeZone.getDefault());
localCalendar.set(fromDate.getYear(), fromDate.getMonth(), fromDate.getDayOfMonth());
int day1 = localCalendar.get(Calendar.DAY_OF_YEAR);
localCalendar.set(toDate.getYear(), toDate.getMonth(), toDate.getDayOfMonth());
int day2 = localCalendar.get(Calendar.DAY_OF_YEAR);
int day = day2-day1;
days.setText(""+day);
}
Note: Make sure you are imported the right files
import java.util.Calendar;
import java.util.TimeZone;
Complete program
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.DatePicker;
import android.widget.EditText;
import java.util.Calendar;
import java.util.TimeZone;
public class MainActivity extends AppCompatActivity {
DatePicker fromDate, toDate;
EditText days;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fromDate = (DatePicker) findViewById(R.id.datePicker1);
toDate = (DatePicker) findViewById(R.id.datePicker2);
days = (EditText)findViewById(R.id.Days);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
fromDate.init(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH), new DatePicker.OnDateChangedListener() {
#Override
public void onDateChanged(DatePicker datePicker, int year, int month, int dayOfMonth) {
UpdateText();
}
});
toDate.init(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH), new DatePicker.OnDateChangedListener() {
#Override
public void onDateChanged(DatePicker datePicker, int year, int month, int dayOfMonth) {
UpdateText();
}
});
}
private void UpdateText() {
Calendar localCalendar = Calendar.getInstance(TimeZone.getDefault());
localCalendar.set(fromDate.getYear(), fromDate.getMonth(), fromDate.getDayOfMonth());
int day1 = localCalendar.get(Calendar.DAY_OF_YEAR);
localCalendar.set(toDate.getYear(), toDate.getMonth(), toDate.getDayOfMonth());
int day2 = localCalendar.get(Calendar.DAY_OF_YEAR);
int day = day2-day1;
days.setText(""+day);
}
}

Want to use three DatePicker and Display it on TextView

I am tryin to set three DatePicker and want to display selected date in TextView. I tried alot but generating an error like:-
ATAL EXCEPTION: main
Process: com.example.sachin.datepicker, PID: 5708
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.EditText.setInputType(int)' on a null object reference
at com.example.sachin.datepicker.MainActivity.onCreateView(MainActivity.java:40)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:2074)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1286)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:758)
Here I posted complete code of it.. just take a look on it,
MainActivity2.java
package com.example.sachin.datepicker;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class Main2Activity extends AppCompatActivity {
Button next;
FragmentManager mFragmentManager;
FragmentTransaction mFragmentTransaction;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
next= (Button)findViewById(R.id.next);
next.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
mFragmentManager = getSupportFragmentManager();
mFragmentTransaction = mFragmentManager.beginTransaction();
mFragmentTransaction.replace(R.id.containerView,new MainActivity()).commit();
}
});
}
}
Here, MainActivity.java
package com.example.sachin.datepicker;
import android.annotation.TargetApi;
import android.app.DatePickerDialog;
import android.icu.text.SimpleDateFormat;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.text.InputType;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.DatePicker;
import android.widget.EditText;
import java.util.Calendar;
import java.util.Locale;
public class MainActivity extends Fragment implements View.OnClickListener {
public MainActivity() {};
EditText openingdate,Birthdate,Anniversary;
private DatePickerDialog fromDatePickerDialog;
private DatePickerDialog toDatePickerDialog;
private DatePickerDialog toDatePickerDialog1;
private SimpleDateFormat dateFormatter;
View view;
#TargetApi(Build.VERSION_CODES.N)
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
view = inflater.inflate(R.layout.activity_add_wod, container, false);
dateFormatter = new SimpleDateFormat("dd-MM-yyyy", Locale.ENGLISH);
openingdate = (EditText) view.findViewById(R.id.openingdate);
openingdate.setInputType(InputType.TYPE_NULL);
openingdate.requestFocus();
Birthdate = (EditText)view. findViewById(R.id.Birthdate);
Birthdate.setInputType(InputType.TYPE_NULL);
Birthdate.requestFocus();
Anniversary = (EditText)view. findViewById(R.id.Anniversary);
Anniversary.setInputType(InputType.TYPE_NULL);
setDateTimeField();
return view;
}
private void setDateTimeField() {
openingdate.setOnClickListener(this);
Birthdate.setOnClickListener(this);
Anniversary.setOnClickListener(this);
Calendar newCalendar = Calendar.getInstance();
fromDatePickerDialog = new DatePickerDialog(getActivity(), new DatePickerDialog.OnDateSetListener() {
#TargetApi(Build.VERSION_CODES.N)
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
Calendar newDate = Calendar.getInstance();
newDate.set(year, monthOfYear, dayOfMonth);
openingdate.setText(dateFormatter.format(newDate.getTime()));
}
},newCalendar.get(Calendar.YEAR), newCalendar.get(Calendar.MONTH), newCalendar.get(Calendar.DAY_OF_MONTH));
toDatePickerDialog = new DatePickerDialog(getActivity(), new DatePickerDialog.OnDateSetListener() {
#TargetApi(Build.VERSION_CODES.N)
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
Calendar newDate = Calendar.getInstance();
newDate.set(year, monthOfYear, dayOfMonth);
Birthdate.setText(dateFormatter.format(newDate.getTime()));
}
},newCalendar.get(Calendar.YEAR), newCalendar.get(Calendar.MONTH), newCalendar.get(Calendar.DAY_OF_MONTH));
toDatePickerDialog1 = new DatePickerDialog(getActivity(), new DatePickerDialog.OnDateSetListener() {
#TargetApi(Build.VERSION_CODES.N)
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
Calendar newDate = Calendar.getInstance();
newDate.set(year, monthOfYear, dayOfMonth);
Anniversary.setText(dateFormatter.format(newDate.getTime()));
}
},newCalendar.get(Calendar.YEAR), newCalendar.get(Calendar.MONTH), newCalendar.get(Calendar.DAY_OF_MONTH));
}
// #Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getActivity().getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public void onClick(View view) {
if(view == openingdate) {
fromDatePickerDialog.show();
} else if(view == Birthdate) {
toDatePickerDialog.show();
} else if(view == Anniversary) {
toDatePickerDialog1.show();
}
}
}
and lastly manifest file
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.sachin.datepicker">
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<Activity android:name=".MainActivity" />
<activity android:name=".Main2Activity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
I tried alot but always getting error...

.setInputType(InputType.TYPE_CLASS_DATETIME);
Change all in .setInputType, try below code also.
#TargetApi(Build.VERSION_CODES.N)
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.activity_add_wod, container, false);
dateFormatter = new SimpleDateFormat("dd-MM-yyyy", Locale.ENGLISH);
openingdate = (EditText) view.findViewById(R.id.openingdate);
openingdate.setInputType(InputType.TYPE_NULL);
openingdate.requestFocus();
Birthdate = (EditText) view.findViewById(R.id.Birthdate);
Birthdate.setInputType(InputType.TYPE_NULL);
Birthdate.requestFocus();
Anniversary = (EditText) view.findViewById(R.id.Anniversary);
Anniversary.setInputType(InputType.TYPE_NULL);
setDateTimeField();
return view;
}
private void setDateTimeField() {
openingdate.setOnClickListener(this);
Birthdate.setOnClickListener(this);
Anniversary.setOnClickListener(this);
Calendar newCalendar = Calendar.getInstance();
fromDatePickerDialog = new DatePickerDialog(getActivity(), new DatePickerDialog.OnDateSetListener() {
#TargetApi(Build.VERSION_CODES.N)
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
Calendar newDate = Calendar.getInstance();
newDate.set(year, monthOfYear, dayOfMonth);
openingdate.setText(dateFormatter.format(newDate.getTime()));
}
},newCalendar.get(Calendar.YEAR), newCalendar.get(Calendar.MONTH), newCalendar.get(Calendar.DAY_OF_MONTH));
toDatePickerDialog = new DatePickerDialog(getActivity(), new DatePickerDialog.OnDateSetListener() {
#TargetApi(Build.VERSION_CODES.N)
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
Calendar newDate = Calendar.getInstance();
newDate.set(year, monthOfYear, dayOfMonth);
Birthdate.setText(dateFormatter.format(newDate.getTime()));
}
},newCalendar.get(Calendar.YEAR), newCalendar.get(Calendar.MONTH), newCalendar.get(Calendar.DAY_OF_MONTH));
toDatePickerDialog1 = new DatePickerDialog(getActivity(), new DatePickerDialog.OnDateSetListener() {
#TargetApi(Build.VERSION_CODES.N)
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
Calendar newDate = Calendar.getInstance();
newDate.set(year, monthOfYear, dayOfMonth);
Anniversary.setText(dateFormatter.format(newDate.getTime()));
}
},newCalendar.get(Calendar.YEAR), newCalendar.get(Calendar.MONTH), newCalendar.get(Calendar.DAY_OF_MONTH));
}
#Override
public void onClick(View view) {
if(view == openingdate) {
fromDatePickerDialog.show();
} else if(view == Birthdate) {
toDatePickerDialog.show();
} else if(view == Anniversary) {
toDatePickerDialog1.show();
}
}

How to get date "value" from DatePicker?

I don't know how to get the date value from Datepicker.
PickerDialog.java
package com.example.alecksjohanssen.newyorktimes;
/**
* Created by AlecksJohanssen on 3/19/2016.
*/
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.os.Bundle;
import java.util.Calendar;
public class PickerDialog extends DialogFragment {
#Override
public Dialog onCreateDialog(Bundle savedInstanceState)
{ DateSettings dateSettings = new DateSettings(getActivity());
Calendar calendar = Calendar.getInstance();
int year = calendar.get(Calendar.YEAR);
int month = calendar.get(Calendar.MONTH);
int dayofmonth = calendar.get(Calendar.DAY_OF_MONTH);
DatePickerDialog dialog;
dialog = new DatePickerDialog(getActivity(),dateSettings,year,month,dayofmonth);
return dialog;
}
}
DateSetting.java
package com.example.alecksjohanssen.newyorktimes;
import android.app.DatePickerDialog;
import android.content.Context;
import android.widget.DatePicker;
import android.widget.Toast;
/**
* Created by My name Is Hardline on 2/26/2016.
*/
public class DateSettings implements DatePickerDialog.OnDateSetListener {
Context context;
public DateSettings(Context context) {
this.context = context;
}
#Override
public void onDateSet(DatePicker view, int year, int monthofyear,int dayofmonth) {
Toast.makeText(context, "Selected date" + monthofyear + "/" + dayofmonth + "/" + year, Toast.LENGTH_LONG).show();
}
}
public void setDate() {
PickerDialog pickerDialogs = new PickerDialog();
pickerDialogs.show(getFragmentManager(), "date_picker");
}
It's basically it, it's only shows that Selected date is . Still I'm looking for how to extract the date data so that I can put it on my Begin Date :P.

You can try like this
private void datePicker(){
Calendar calendar = Calendar.getInstance();
final SimpleDateFormat dateFormatter = new SimpleDateFormat("yyyy-MM-dd", Locale.US);
DatePickerDialog datePickerDialog = new DatePickerDialog(activity, new DatePickerDialog.OnDateSetListener() {
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
Calendar newDate = Calendar.getInstance();
newDate.set(year, monthOfYear, dayOfMonth);
System.out.print(dateFormatter.format(newDate.getTime()));
}
}, calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH));
datePickerDialog.show();
}

Say you have Calendar mCalendar that you want to init the date picker with it.
dialog.getDatePicker().init(mCalendar.get(Calendar.YEAR), mCalendar.get(Calendar.MONTH), mCalendar.get(Calendar.DAY_OF_MONTH), new DatePicker.OnDateChangedListener() {
#Override
public void onDateChanged(DatePicker datePicker, int i, int i2, int i3) {
mCalendar.set(i, i2, i3);
}
});
Then to get the picked date
mCalendar.getTime()

DatePicker returns null (Android)

I'm trying to show DatePicker when user clicks the calendar icon in ActionBar and set the date picked in Textview.But I keep on getting these error.Any help or suggestions would be appreciated.Thank you.
sendUserActionEvent()mView==null
This is my code:
private DatePickerDialog PickDateDialog;
//I called setDataField() in onCreate
private void setDateField() {
Calendar newCalendar = Calendar.getInstance();
PickDateDialog = new PickDateDialog(this, new OnDateSetListener()
{
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
Calendar newDate = Calendar.getInstance();
newDate.set(year, monthOfYear, dayOfMonth);
add_show.setText(dateFormatter.format(newDate.getTime()));
}
},newCalendar.get(Calendar.YEAR), newCalendar.get(Calendar.MONTH), newCalendar.get(Calendar.DAY_OF_MONTH));
}
//Under onOptionsItemSelected menu
if (id == R.id.action_pickdate) {
PickDateDialog.show();
return true;
};

I tried your code, and it works!
Just using his DateFormat
import android.app.*;
import android.os.*;
import android.widget.*;
import java.util.*;
import android.view.*;
public class MainActivity extends Activity {
private DatePickerDialog PickDateDialog;
private TextView add_show;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
add_show = new TextView(this);
setContentView(add_show);
setDateField();
}
private void setDateField() {
Calendar newCalendar = Calendar.getInstance();
PickDateDialog = new DatePickerDialog(this, new DatePickerDialog.OnDateSetListener() {
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
Calendar newDate = Calendar.getInstance();
newDate.set(year, monthOfYear, dayOfMonth);
add_show.setText(newDate.getTime().toLocaleString());
}
},newCalendar.get(Calendar.YEAR), newCalendar.get(Calendar.MONTH), newCalendar.get(Calendar.DAY_OF_MONTH));
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
menu.add("pickdate").setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
#Override
public boolean onMenuItemClick(MenuItem p1) {
PickDateDialog.show();
return true;
}
}).setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
return super.onCreateOptionsMenu(menu);
}
}

How to disable future date with Datepicker

I am trying to disable date picker for future date but getting not idea...
Here is the what I have tried:
bday.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Calendar mcurrentDate=Calendar.getInstance();
year=mcurrentDate.get(Calendar.YEAR);
month=mcurrentDate.get(Calendar.MONTH);
day=mcurrentDate.get(Calendar.DAY_OF_MONTH);
DatePickerDialog mDatePicker =new DatePickerDialog(CreateAccountActivity.this, new OnDateSetListener()
{
#Override
public void onDateSet(DatePicker datepicker, int selectedyear, int selectedmonth, int selectedday)
{
year = selectedyear;
month = selectedmonth;
day = selectedday;
DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
Calendar cal = Calendar.getInstance();
String currenttime = new String(dateFormat.format(cal.getTime()));
String selectedtime = new String (new StringBuilder().append(year).append("-").append(month+1).append("-").append(day));
String futuretime = new String (dateFormat.format(System.currentTimeMillis()));
if(selectedtime==currenttime)
{
Toast.makeText(getApplicationContext(), "you were not born in the future", Toast.LENGTH_SHORT).show();
bday.setText("");
}
else
{
bday.setText(new StringBuilder().append(year).append("-").append(month+1).append("-").append(day));
}}
},year, month, day);
mDatePicker.setTitle("Please select date");
mDatePicker.show();
}
});
Stackoverflow suggested to use:
mDatePicker.getDatePicker().setMaxDate(System.currentTimeMillis());
but in above condition how should I use this.?
I am trying to disable future date. But not getting any idea :(

After Declaring Listener on DatePicker use the mDatePicker.getDatePicker().setMaxDate(System.currentTimeMillis());

package com.keshav.datePicker_With_Hide_Future_Past_Date;
import android.app.DatePickerDialog;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.DatePicker;
import android.widget.EditText;
import java.util.Calendar;
public class MainActivity extends AppCompatActivity {
EditText ed_date;
int year;
int month;
int day;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ed_date=(EditText) findViewById(R.id.et_date);
ed_date.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
Calendar mcurrentDate=Calendar.getInstance();
year=mcurrentDate.get(Calendar.YEAR);
month=mcurrentDate.get(Calendar.MONTH);
day=mcurrentDate.get(Calendar.DAY_OF_MONTH);
final DatePickerDialog mDatePicker =new DatePickerDialog(MainActivity.this, new DatePickerDialog.OnDateSetListener()
{
#Override
public void onDateSet(DatePicker datepicker, int selectedyear, int selectedmonth, int selectedday)
{
ed_date.setText(new StringBuilder().append(year).append("-").append(month+1).append("-").append(day));
int month_k=selectedmonth+1;
}
},year, month, day);
mDatePicker.setTitle("Please select date");
// TODO Hide Future Date Here
mDatePicker.getDatePicker().setMaxDate(System.currentTimeMillis());
// TODO Hide Past Date Here
// mDatePicker.getDatePicker().setMinDate(System.currentTimeMillis());
mDatePicker.show();
}
});
}
}