Develop Reference

Single button multiple action in sequence

I am using a single button to do two task.
1.Date Selection
2.Difference between two dates
As-is:
I am using 'onclick' method for two button.
btnDate2 using to select the date and onclick is(setDate2)
button9 using to calculate the difference between two dates and onclick is(diff)
To-be:
One button for selecting the date and calculate the difference between two dates.And it should be in sequence.ex:
1: Select date
2. Calculate the difference between dates
Current code:
MainActivity.java
package com.bar.example.myapplication;
import android.app.DialogFragment;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.format.DateFormat;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import org.threeten.bp.LocalDate;
import org.threeten.bp.format.DateTimeFormatter;
import org.threeten.bp.format.DateTimeParseException;
import org.threeten.bp.temporal.ChronoUnit;
import java.text.SimpleDateFormat;
public class MainActivity extends AppCompatActivity {
public TextView txtResult, tv, textDivNumber, textAVG, txtZaMisiac;
public static TextView tvresult;
public Button reset, button, button1, button2, button9, editTextDate3, editTextDate5, btnok;
public EditText barcodeResult;
public static EditText courseTitleEditText;
private ListView offeringsListView;
private static DateTimeFormatter dateFormatter = DateTimeFormatter.ofPattern("d.M.uuuu");
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
editTextDate5 = (Button) findViewById(R.id.editText5);
button2 = (Button) findViewById(R.id.btnDate2);
txtResult = (TextView) findViewById(R.id.editText2);
editTextDate5.setText(DateFormat.format("dd.MM.yyyy", new java.util.Date()).toString());
}
public void diff(View view) {
SimpleDateFormat myFormat = new SimpleDateFormat("dd.MM.yyyy");
CharSequence inputString1 = editTextDate5.getText();
try {
LocalDate date1 = LocalDate.parse(inputString1, dateFormatter);
CharSequence inputString2 = button2.getText();
try {
LocalDate date2 = LocalDate.parse(inputString2, dateFormatter);
long diffDate = ChronoUnit.DAYS.between(date1, date2);
txtResult.setText(String.valueOf(diffDate));
} catch (DateTimeParseException dtpe) {
Toast.makeText(this, "Date2 is not a valid date: " + inputString2, Toast.LENGTH_SHORT).show();
}
} catch (DateTimeParseException dtpe) {
Toast.makeText(this, "Date1 is not a valid date: " + inputString1, Toast.LENGTH_SHORT).show();
}
}
public void setDate1(View view) {
DialogFragment newFragment = new DatePickerFragment();
newFragment.show(getFragmentManager(), "Date Picker");
}
public void setDate2(View view) {
DialogFragment newFragment = new DatePickerFragment2();
newFragment.show(getFragmentManager(), "Date Picker");
}
#Override
public void onPointerCaptureChanged(boolean hasCapture) {
}
}
Datepickerformat2.java
package com.bar.example.myapplication;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.os.Bundle;
import android.widget.Button;
import android.widget.DatePicker;
import java.util.Calendar;
public class DatePickerFragment2 extends DialogFragment implements DatePickerDialog.OnDateSetListener {
#Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
final 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(), this, year, month, day);
}
public void onDateSet(DatePicker view, int year, int month, int day) {
Button btnDate2 = (Button) getActivity().findViewById(R.id.btnDate2);
String stringOfDate = day + "." + (month + 1) + "." + year;
btnDate2.setText(stringOfDate);
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical">
<LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" android:weightSum="1">
<TextView android:id="#+id/editText1" android:layout_width="47dp" android:layout_height="wrap_content" android:ems="10" android:inputType="textNoSuggestions" android:text="Date:" />
<Button android:id="#+id/editText5" android:layout_width="47dp" android:layout_height="wrap_content" android:layout_weight="0.50" android:ems="10" android:inputType="textNoSuggestions" android:text="" />
<TextView android:id="#+id/editText2" android:layout_width="49dp" android:layout_height="wrap_content" android:ems="10" android:inputType="textNoSuggestions" android:text="Expiry:" />
<Button android:id="#+id/btnDate2" android:layout_width="59dp" android:layout_height="wrap_content" android:layout_weight="0.41" android:ems="10" android:onClick="setDate2" android:text="" />
<Button android:id="#+id/button9" android:layout_width="59dp" android:layout_height="wrap_content" android:layout_weight="0.41" android:ems="10" android:inputType="textNoSuggestions" android:onClick="diff" android:text="calc" />
</LinearLayout>
with amended code.
With 1st Click ,
After selecting ok.
Now again i should click the calc button to know the days difference.
What i need is 1st click the date and select "ok" upon choosing the date.i should be able to see the days difference upon clicking "ok" as per screen instead of pressing again the button.
Requirement 3:
When edittext2 number is exceeds vs spinner2 number then edittext2 color should change it to red color and some doast message
When edittext2 number is reaching to very near vs spinner2 number then edittext2 color should change it to yellow color and some doast message

1.Add below method into MainActivity.java:
public void dualFunctions(View view) {
if(view.getTag() == null) view.setTag("0");
if(view.getTag().equals("0")){
view.setTag("1");
view.setBackgroundColor(Color.GREEN);
setDate2(view);
}else{
view.setTag("0"); // Remove this line for one shoot.
view.setBackgroundColor(Color.YELLOW);
diff(view);
}
}
2.Change the button in layout to use this method.
The method toggles between date selection and calculation. If date selection is allowed for only once, then remove the line with comment.
Hope that helps!
Updated:
public void onDateSet(DatePicker view, int year, int month, int day) {
Button btnDate2 = (Button) getActivity().findViewById(R.id.btnDate2);
String stringOfDate = day + "." + (month + 1) + "." + year;
btnDate2.setText(stringOfDate);
MainActivity activity = (MainActivity)getActivity();
activity.diff(btnDate2);
}
For Requirement3:
Added if-else to check conditions.
private final static int VERY_NEAR_DATE = 30;
public void diff(View view) {
SimpleDateFormat myFormat = new SimpleDateFormat("dd.MM.yyyy");
CharSequence inputString1 = editTextDate5.getText();
try {
LocalDate date1 = LocalDate.parse(inputString1, dateFormatter);
CharSequence inputString2 = button2.getText();
try {
LocalDate date2 = LocalDate.parse(inputString2, dateFormatter);
long diffDate = ChronoUnit.DAYS.between(date1, date2);
txtResult.setText(String.valueOf(diffDate));
diffDate = (Long)ok2.getSelectedItem() - diffDate;
if(diffDate < 0){
txtResult.setTextColor(Color.RED);
Toast.makeText(this, "Date not allowed!!", Toast.LENGTH_SHORT).show();
}else if(diffDate < VERY_NEAR_DATE) {
txtResult.setTextColor(Color.YELLOW);
Toast.makeText(this, "Date too near!", Toast.LENGTH_SHORT).show();
}
} catch (DateTimeParseException dtpe) {
Toast.makeText(this, "Date2 is not a valid date: " + inputString2, Toast.LENGTH_SHORT).show();
}
} catch (DateTimeParseException dtpe) {
Toast.makeText(this, "Date1 is not a valid date: " + inputString1, Toast.LENGTH_SHORT).show();
}
}
If need to update views after selection changed in spinner, then add below code inside onCreate():
ok2.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
diff(null);
}
#Override
public void onNothingSelected(AdapterView<?> parent) {}
});

how to keep min Age Limit in Android

Am building an demo app, in which I would like to allow people who are above 21yrs, how do I do this.
I want to take there DOB and calculate the age, with the current year. I want to use DatePicker, but messed up seeing different snippets. thanks

This is a simple code that will guide your to achieve what your are planning for.
It uses a button click to launch the DatePicker Dialog
Layout file
<?xml version="1.0" encoding="utf-8"?>
<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:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.inducesmile.mydatepicker.MainActivity">
<EditText
android:id="#+id/display_dob"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="24dp"/>
<Button
android:id="#+id/select_dob"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="16dp"
android:textColor="#000000"
android:textSize="15sp"
android:text="Select your Date of birth"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"/>
</RelativeLayout>
Then the Activity class
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.Toast;
import java.util.Calendar;
public class MainActivity extends AppCompatActivity {
private DatePickerFragment datePickerFragment;
private static Calendar dateTime = Calendar.getInstance();
protected static int mYear;
protected static int mMonth;
protected static int mDay;
private static final int allowedDOB = 21;
protected static EditText displayDOB;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
displayDOB = (EditText)findViewById(R.id.display_dob);
Button dobButton = (Button) findViewById(R.id.select_dob);
dobButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
datePickerFragment = new DatePickerFragment();
datePickerFragment.show(getSupportFragmentManager(), "Select Your Birthday");
}
});
}
public static class DatePickerFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener {
#Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
// Using current date as start Date
final Calendar c = Calendar.getInstance();
mYear = c.get(Calendar.YEAR);
mMonth = c.get(Calendar.MONTH);
mDay = c.get(Calendar.DAY_OF_MONTH);
// Get DatePicker Dialog
return new DatePickerDialog(getActivity(), this, mYear, mMonth, mDay);
}
#Override
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
mYear = year;
mMonth = monthOfYear;
mDay = dayOfMonth;
dateTime.set(mYear, monthOfYear, dayOfMonth);
long selectDateInMilliSeconds = dateTime.getTimeInMillis();
Calendar currentDate = Calendar.getInstance();
long currentDateInMilliSeconds = currentDate.getTimeInMillis();
SimpleDateFormat simpleDate = new SimpleDateFormat("dd/MM/yyyy", Locale.getDefault());
String strDt = simpleDate.format(dateTime.getTime());
displayDOB.setText(strDt);
if (selectDateInMilliSeconds > currentDateInMilliSeconds) {
Toast.makeText(getActivity(), "Your birthday date must come before taday's date", Toast.LENGTH_LONG).show();
return;
}
long diffDate = currentDateInMilliSeconds - selectDateInMilliSeconds;
Calendar yourAge = Calendar.getInstance();
yourAge.setTimeInMillis(diffDate);
long returnedYear = yourAge.get(Calendar.YEAR) - 1970;
if (returnedYear < allowedDOB) {
Toast.makeText(getActivity(), "Sorry!!! You are not allowed to use this app", Toast.LENGTH_LONG).show();
return;
} else {
// move to another activity page
}
}
}
}

if you want to limit the age from datepicker itself you can do like this,
<com.deevita.patient.Custom_Layouts.editText
android:id="#+id/dob"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:drawableStart="#drawable/ic_date_icon"
android:drawablePadding="#dimen/drawable_padding"
android:focusable="false"
android:hint="#string/birthday"
android:inputType="date"
android:padding="#dimen/padding_common_new"
android:textSize="#dimen/font_small">
</com.deevita.patient.Custom_Layouts.editText>
add the following code in java
dob.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
final Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.YEAR,-21); // the age you want to limit
int yy = calendar.get(Calendar.YEAR);
int mm = calendar.get(Calendar.MONTH);
int dd = calendar.get(Calendar.DAY_OF_MONTH);
DatePickerDialog datePicker = new DatePickerDialog(getActivity(), new DatePickerDialog.OnDateSetListener() {
#Override
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
String date = String.valueOf(dayOfMonth) + "-" + String.valueOf(monthOfYear + 1)
+ "-" + String.valueOf(year);
dob.setText(date);
}
}, yy, mm, dd);
datePicker.getDatePicker().setMaxDate(calendar.getTimeInMillis());
datePicker.show();
}
});

if user entered age
driverage = edtdriverage.getText().toString();
else if ( Integer.parseInt(driverage)> 55 || Integer.parseInt(driverage)< 18) {
GlobalMethods.Toast(AddDriverActivity.this, getString(R.string.enter_driver_age_min));
cancel = true;
}
you can achieve by validation method also

Disable side by side DatePicker

How do I disable side by side DatePicker shown in my activity (running under KitKat/ Android 4.4, I'm using Sony Xperia to run it), I've been struggling so much finding this one, the left side contains scrolled part and the right side contains full calender, I want only the full calender shown:
import java.util.Calendar;
import android.app.Activity;
import android.os.Bundle;
import android.widget.DatePicker;
import android.widget.TextView;
public class versi2 extends Activity {
private TextView textViewTanggal;
private DatePicker datePicker;
private int year;
private int month;
private int day;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.versi2);
setCurrentDateOnView();
}
// display current date
public void setCurrentDateOnView() {
textViewTanggal = (TextView) findViewById(R.id.tvDisplayDate);
datePicker = (DatePicker) findViewById(R.id.dpResult);
final Calendar c = Calendar.getInstance();
year = c.get(Calendar.YEAR);
month = c.get(Calendar.MONTH);
day = c.get(Calendar.DAY_OF_MONTH);
// set current date into textview
textViewTanggal.setText(new StringBuilder()
// Month is 0 based, just add 1
.append(month + 1).append("-").append(day).append("-")
.append(year).append(" "));
datePicker.init(year, month, day, dateSetListener);
}
private DatePicker.OnDateChangedListener dateSetListener = new DatePicker.OnDateChangedListener() {
public void onDateChanged(DatePicker view, int year, int monthOfYear,
int dayOfMonth) {
textViewTanggal.setText(new StringBuilder()
// Month is 0 based, just add 1
.append(dayOfMonth + 1).append("-").append(monthOfYear).append("-")
.append(year).append(" "));
}
};
}
And layout :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
....
....
<DatePicker
android:id="#+id/dpResult"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>

DatePicker has a datePickerMode attribute.
Use android:datePickerMode="calendar" to show just the calendar.

Android DatePicker Button not working

Ok so i have this app i'm working on... It has a left menu slide-out using ABS and the sliding menu lib. Here's my fragment that is launched once the menu item is selected. This fragment is suppose to have a text field to display the date you select and a button to select a date. Any idea's on what i'm doing wrong that SelectDateFragment is erroring?
Here's the XML layout:
<EditText
android:id="#+id/dateselected"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="20dp"
android:layout_marginTop="56dp"
android:ems="10"
android:inputType="date" >
<requestFocus />
</EditText>
<Button
android:id="#+id/pickdate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/dateselected"
android:layout_toRightOf="#+id/dateselected"
android:contentDescription="#string/selectdate"
android:cropToPadding="true"
android:onClick="selectDate"
android:src="#drawable/ic_datepicker" />
</RelativeLayout>
Here's the java class:
import java.util.Calendar;
import android.annotation.SuppressLint;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.support.v4.app.Fragment;
import android.support.v4.app.DialogFragment;
import android.widget.EditText;
public class DatePicker extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstaceState){
return inflater.inflate(R.layout.fragment_charting, container, false);
}
EditText mEdit;
#Override
public void onStart() {
super.onStart();
}
public void selectDate(View view) {
DialogFragment newFragment = new SelectDateFragment();
newFragment.show(getFragmentManager(), "DatePicker");
}
public void populateSetDate(int year, int month, int day) {
mEdit = (EditText)getView().findViewById(R.id.dateselected);
mEdit.setText(month+"/"+day+"/"+year);
}
public class SelectDateFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener {
#Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
final Calendar calendar = Calendar.getInstance();
int yy = calendar.get(Calendar.YEAR);
int mm = calendar.get(Calendar.MONTH);
int dd = calendar.get(Calendar.DAY_OF_MONTH);
return new DatePickerDialog(getActivity(), this, yy, mm, dd);
}
#Override
public void onDateSet(android.widget.DatePicker view, int year, int monthOfYear, int dayOfMonth) {
// TODO Auto-generated method stub
populateSetDate(year, monthOfYear, dayOfMonth);
}
}
}
EDIT:
I'm trying to follow http://javapapers.com/android/android-datepicker/
The error i'm getting is the fragment inner class should be static. I don't understand enough about this topic, and from reading more i still do not, to understand why his works and mine does not.

try this one
shipdate.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
showDialog(999);
}
});
#Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case 999:
// set date picker as current date
return new DatePickerDialog(this, datePickerListener, year, month,
day);
}
return null;
}
private DatePickerDialog.OnDateSetListener datePickerListener = new DatePickerDialog.OnDateSetListener() {
// when dialog box is closed, below method will be called.
public void onDateSet(DatePicker view, int selectedYear,
int selectedMonth, int selectedDay) {
final Calendar cf = Calendar.getInstance();
year = cf.get(Calendar.YEAR);
month = cf.get(Calendar.MONTH);
day = cf.get(Calendar.DAY_OF_MONTH);
// set selected date into textview
shipdate.setText(new StringBuilder().append(month + 1)
.append("-").append(day).append("-").append(year)
.append(" "));
}
};

DatePicker does not work

I am trying to use DatePicker in my Android app. When I add it to my layout, I get this message:
The following classes could not be instantiated:
- android.widget.DatePicker (Open Class, Show Error Log)
See the Error Log (Window > Show View) for more details.
So I looked in the error log, and this is what I saw:
android.widget.DatePicker failed to instantiate.
java.lang.NoClassDefFoundError: java/nio/charset/Charsets
at android.net.Uri.decode(Uri.java:1927)
at android.net.Uri$AbstractPart.getDecoded(Uri.java:1957)
at android.net.Uri$StringUri.getAuthority(Uri.java:579)
at android.provider.Settings$NameValueCache.getString(Settings.java:727)
at android.provider.Settings$System.getString(Settings.java:846)
at android.text.format.DateFormat.getDateFormatString(DateFormat.java:393)
at android.text.format.DateFormat.getDateFormatOrder(DateFormat.java:364)
at android.widget.DatePicker.reorderSpinners(DatePicker.java:511)
at android.widget.DatePicker.<init>(DatePicker.java:280)
at android.widget.DatePicker.<init>(DatePicker.java:145)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.android.ide.eclipse.adt.internal.editors.layout.ProjectCallback.instantiateClass(ProjectCallback.java:402)
at com.android.ide.eclipse.adt.internal.editors.layout.ProjectCallback.loadView(ProjectCallback.java:166)
at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:207)
at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:135)
at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:746)
at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:64)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:718)
at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
at android.view.LayoutInflater.inflate(LayoutInflater.java:372)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:321)
at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:331)
at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:325)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.RenderService.createRenderSession(RenderService.java:372)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.renderWithBridge(GraphicalEditorPart.java:1640)
at [SNIPPED FOR LENGTH; SEE REVISION HISTORY FOR FULL TRACE -ed]
Why is this happening?

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="#+id/btnChangeDate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Change Date" />
<TextView
android:id="#+id/lblDate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Current Date (M-D-YYYY): "
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="#+id/tvDate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:textAppearance="?android:attr/textAppearanceLarge" />
<DatePicker
android:id="#+id/dpResult"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
import java.util.Calendar;
import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;
public class MyAndroidAppActivity extends Activity {
private TextView tvDisplayDate;
private DatePicker dpResult;
private Button btnChangeDate;
private int year;
private int month;
private int day;
static final int DATE_DIALOG_ID = 999;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setCurrentDateOnView();
addListenerOnButton();
}
// display current date
public void setCurrentDateOnView() {
tvDisplayDate = (TextView) findViewById(R.id.tvDate);
dpResult = (DatePicker) findViewById(R.id.dpResult);
final Calendar c = Calendar.getInstance();
year = c.get(Calendar.YEAR);
month = c.get(Calendar.MONTH);
day = c.get(Calendar.DAY_OF_MONTH);
// set current date into textview
tvDisplayDate.setText(new StringBuilder()
// Month is 0 based, just add 1
.append(month + 1).append("-").append(day).append("-")
.append(year).append(" "));
// set current date into datepicker
dpResult.init(year, month, day, null);
}
public void addListenerOnButton() {
btnChangeDate = (Button) findViewById(R.id.btnChangeDate);
btnChangeDate.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
showDialog(DATE_DIALOG_ID);
}
});
}
#Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case DATE_DIALOG_ID:
// set date picker as current date
return new DatePickerDialog(this, datePickerListener,
year, month,day);
}
return null;
}
private DatePickerDialog.OnDateSetListener datePickerListener
= new DatePickerDialog.OnDateSetListener() {
// when dialog box is closed, below method will be called.
public void onDateSet(DatePicker view, int selectedYear,
int selectedMonth, int selectedDay) {
year = selectedYear;
month = selectedMonth;
day = selectedDay;
// set selected date into textview
tvDisplayDate.setText(new StringBuilder().append(month + 1)
.append("-").append(day).append("-").append(year)
.append(" "));
// set selected date into datepicker also
dpResult.init(year, month, day, null);
}
};
}
Read this code it might be helpful to you