Custom Calendar in Android | Android Calendar Example with full source code

Hello dear friends,
 Today I am going to share very Important code for custom calender in Android.
Actually android not provide any calender view so its a very big draw back for developer but we can create a custom calender using grid-view.Important step is given below-
 1- Create new project e.g.-CustomCalenderAndroid
2- Create an activity MyCalendarActivity.java
3- Create layout my_calendar_view.xml
4- Create another xml file screen_gridcell.xml
 5- Add styles_calendar_events.xml in values folder
6- Add Images for calendar in drawable folder

1-Print Screen:

2-MyCalendarActivity.java

package com.examples;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;

import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.text.format.DateFormat;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.TextView;

@TargetApi(3)
public class MyCalendarActivity extends Activity implements OnClickListener {
 private static final String tag = "MyCalendarActivity";

 private TextView currentMonth;
 private Button selectedDayMonthYearButton;
 private ImageView prevMonth;
 private ImageView nextMonth;
 private GridView calendarView;
 private GridCellAdapter adapter;
 private Calendar _calendar;
 @SuppressLint("NewApi")
 private int month, year;
 @SuppressWarnings("unused")
 @SuppressLint({ "NewApi", "NewApi", "NewApi", "NewApi" })
 private final DateFormat dateFormatter = new DateFormat();
 private static final String dateTemplate = "MMMM yyyy";

 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.my_calendar_view);

  _calendar = Calendar.getInstance(Locale.getDefault());
  month = _calendar.get(Calendar.MONTH) + 1;
  year = _calendar.get(Calendar.YEAR);
  Log.d(tag, "Calendar Instance:= " + "Month: " + month + " " + "Year: "
    + year);

  selectedDayMonthYearButton = (Button) this
    .findViewById(R.id.selectedDayMonthYear);
  selectedDayMonthYearButton.setText("Selected: ");

  prevMonth = (ImageView) this.findViewById(R.id.prevMonth);
  prevMonth.setOnClickListener(this);

  currentMonth = (TextView) this.findViewById(R.id.currentMonth);
  currentMonth.setText(DateFormat.format(dateTemplate,
    _calendar.getTime()));

  nextMonth = (ImageView) this.findViewById(R.id.nextMonth);
  nextMonth.setOnClickListener(this);

  calendarView = (GridView) this.findViewById(R.id.calendar);

  // Initialised
  adapter = new GridCellAdapter(getApplicationContext(),
    R.id.calendar_day_gridcell, month, year);
  adapter.notifyDataSetChanged();
  calendarView.setAdapter(adapter);
 }

 /**
  * 
  * @param month
  * @param year
  */
 private void setGridCellAdapterToDate(int month, int year) {
  adapter = new GridCellAdapter(getApplicationContext(),
    R.id.calendar_day_gridcell, month, year);
  _calendar.set(year, month - 1, _calendar.get(Calendar.DAY_OF_MONTH));
  currentMonth.setText(DateFormat.format(dateTemplate,
    _calendar.getTime()));
  adapter.notifyDataSetChanged();
  calendarView.setAdapter(adapter);
 }

 @Override
 public void onClick(View v) {
  if (v == prevMonth) {
   if (month <= 1) {
    month = 12;
    year--;
   } else {
    month--;
   }
   Log.d(tag, "Setting Prev Month in GridCellAdapter: " + "Month: "
     + month + " Year: " + year);
   setGridCellAdapterToDate(month, year);
  }
  if (v == nextMonth) {
   if (month > 11) {
    month = 1;
    year++;
   } else {
    month++;
   }
   Log.d(tag, "Setting Next Month in GridCellAdapter: " + "Month: "
     + month + " Year: " + year);
   setGridCellAdapterToDate(month, year);
  }

 }

 @Override
 public void onDestroy() {
  Log.d(tag, "Destroying View ...");
  super.onDestroy();
 }

 // Inner Class
 public class GridCellAdapter extends BaseAdapter implements OnClickListener {
  private static final String tag = "GridCellAdapter";
  private final Context _context;

  private final List<String> list;
  private static final int DAY_OFFSET = 1;
  private final String[] weekdays = new String[] { "Sun", "Mon", "Tue",
    "Wed", "Thu", "Fri", "Sat" };
  private final String[] months = { "January", "February", "March",
    "April", "May", "June", "July", "August", "September",
    "October", "November", "December" };
  private final int[] daysOfMonth = { 31, 28, 31, 30, 31, 30, 31, 31, 30,
    31, 30, 31 };
  private int daysInMonth;
  private int currentDayOfMonth;
  private int currentWeekDay;
  private Button gridcell;
  private TextView num_events_per_day;
  private final HashMap<String, Integer> eventsPerMonthMap;
  private final SimpleDateFormat dateFormatter = new SimpleDateFormat(
    "dd-MMM-yyyy");

  // Days in Current Month
  public GridCellAdapter(Context context, int textViewResourceId,
    int month, int year) {
   super();
   this._context = context;
   this.list = new ArrayList<String>();
   Log.d(tag, "==> Passed in Date FOR Month: " + month + " "
     + "Year: " + year);
   Calendar calendar = Calendar.getInstance();
   setCurrentDayOfMonth(calendar.get(Calendar.DAY_OF_MONTH));
   setCurrentWeekDay(calendar.get(Calendar.DAY_OF_WEEK));
   Log.d(tag, "New Calendar:= " + calendar.getTime().toString());
   Log.d(tag, "CurrentDayOfWeek :" + getCurrentWeekDay());
   Log.d(tag, "CurrentDayOfMonth :" + getCurrentDayOfMonth());

   // Print Month
   printMonth(month, year);

   // Find Number of Events
   eventsPerMonthMap = findNumberOfEventsPerMonth(year, month);
  }

  private String getMonthAsString(int i) {
   return months[i];
  }

  private String getWeekDayAsString(int i) {
   return weekdays[i];
  }

  private int getNumberOfDaysOfMonth(int i) {
   return daysOfMonth[i];
  }

  public String getItem(int position) {
   return list.get(position);
  }

  @Override
  public int getCount() {
   return list.size();
  }

  /**
   * Prints Month
   * 
   * @param mm
   * @param yy
   */
  private void printMonth(int mm, int yy) {
   Log.d(tag, "==> printMonth: mm: " + mm + " " + "yy: " + yy);
   int trailingSpaces = 0;
   int daysInPrevMonth = 0;
   int prevMonth = 0;
   int prevYear = 0;
   int nextMonth = 0;
   int nextYear = 0;

   int currentMonth = mm - 1;
   String currentMonthName = getMonthAsString(currentMonth);
   daysInMonth = getNumberOfDaysOfMonth(currentMonth);

   Log.d(tag, "Current Month: " + " " + currentMonthName + " having "
     + daysInMonth + " days.");

   GregorianCalendar cal = new GregorianCalendar(yy, currentMonth, 1);
   Log.d(tag, "Gregorian Calendar:= " + cal.getTime().toString());

   if (currentMonth == 11) {
    prevMonth = currentMonth - 1;
    daysInPrevMonth = getNumberOfDaysOfMonth(prevMonth);
    nextMonth = 0;
    prevYear = yy;
    nextYear = yy + 1;
    Log.d(tag, "*->PrevYear: " + prevYear + " PrevMonth:"
      + prevMonth + " NextMonth: " + nextMonth
      + " NextYear: " + nextYear);
   } else if (currentMonth == 0) {
    prevMonth = 11;
    prevYear = yy - 1;
    nextYear = yy;
    daysInPrevMonth = getNumberOfDaysOfMonth(prevMonth);
    nextMonth = 1;
    Log.d(tag, "**--> PrevYear: " + prevYear + " PrevMonth:"
      + prevMonth + " NextMonth: " + nextMonth
      + " NextYear: " + nextYear);
   } else {
    prevMonth = currentMonth - 1;
    nextMonth = currentMonth + 1;
    nextYear = yy;
    prevYear = yy;
    daysInPrevMonth = getNumberOfDaysOfMonth(prevMonth);
    Log.d(tag, "***---> PrevYear: " + prevYear + " PrevMonth:"
      + prevMonth + " NextMonth: " + nextMonth
      + " NextYear: " + nextYear);
   }

   int currentWeekDay = cal.get(Calendar.DAY_OF_WEEK) - 1;
   trailingSpaces = currentWeekDay;

   Log.d(tag, "Week Day:" + currentWeekDay + " is "
     + getWeekDayAsString(currentWeekDay));
   Log.d(tag, "No. Trailing space to Add: " + trailingSpaces);
   Log.d(tag, "No. of Days in Previous Month: " + daysInPrevMonth);

   if (cal.isLeapYear(cal.get(Calendar.YEAR)))
    if (mm == 2)
     ++daysInMonth;
    else if (mm == 3)
     ++daysInPrevMonth;

   // Trailing Month days
   for (int i = 0; i < trailingSpaces; i++) {
    Log.d(tag,
      "PREV MONTH:= "
        + prevMonth
        + " => "
        + getMonthAsString(prevMonth)
        + " "
        + String.valueOf((daysInPrevMonth
          - trailingSpaces + DAY_OFFSET)
          + i));
    list.add(String
      .valueOf((daysInPrevMonth - trailingSpaces + DAY_OFFSET)
        + i)
      + "-GREY"
      + "-"
      + getMonthAsString(prevMonth)
      + "-"
      + prevYear);
   }

   // Current Month Days
   for (int i = 1; i <= daysInMonth; i++) {
    Log.d(currentMonthName, String.valueOf(i) + " "
      + getMonthAsString(currentMonth) + " " + yy);
    if (i == getCurrentDayOfMonth()) {
     list.add(String.valueOf(i) + "-BLUE" + "-"
       + getMonthAsString(currentMonth) + "-" + yy);
    } else {
     list.add(String.valueOf(i) + "-WHITE" + "-"
       + getMonthAsString(currentMonth) + "-" + yy);
    }
   }

   // Leading Month days
   for (int i = 0; i < list.size() % 7; i++) {
    Log.d(tag, "NEXT MONTH:= " + getMonthAsString(nextMonth));
    list.add(String.valueOf(i + 1) + "-GREY" + "-"
      + getMonthAsString(nextMonth) + "-" + nextYear);
   }
  }

  /**
   * NOTE: YOU NEED TO IMPLEMENT THIS PART Given the YEAR, MONTH, retrieve
   * ALL entries from a SQLite database for that month. Iterate over the
   * List of All entries, and get the dateCreated, which is converted into
   * day.
   * 
   * @param year
   * @param month
   * @return
   */
  private HashMap<String, Integer> findNumberOfEventsPerMonth(int year,
    int month) {
   HashMap<String, Integer> map = new HashMap<String, Integer>();

   return map;
  }

  @Override
  public long getItemId(int position) {
   return position;
  }

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
   View row = convertView;
   if (row == null) {
    LayoutInflater inflater = (LayoutInflater) _context
      .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    row = inflater.inflate(R.layout.screen_gridcell, parent, false);
   }

   // Get a reference to the Day gridcell
   gridcell = (Button) row.findViewById(R.id.calendar_day_gridcell);
   gridcell.setOnClickListener(this);

   // ACCOUNT FOR SPACING

   Log.d(tag, "Current Day: " + getCurrentDayOfMonth());
   String[] day_color = list.get(position).split("-");
   String theday = day_color[0];
   String themonth = day_color[2];
   String theyear = day_color[3];
   if ((!eventsPerMonthMap.isEmpty()) && (eventsPerMonthMap != null)) {
    if (eventsPerMonthMap.containsKey(theday)) {
     num_events_per_day = (TextView) row
       .findViewById(R.id.num_events_per_day);
     Integer numEvents = (Integer) eventsPerMonthMap.get(theday);
     num_events_per_day.setText(numEvents.toString());
    }
   }

   // Set the Day GridCell
   gridcell.setText(theday);
   gridcell.setTag(theday + "-" + themonth + "-" + theyear);
   Log.d(tag, "Setting GridCell " + theday + "-" + themonth + "-"
     + theyear);

   if (day_color[1].equals("GREY")) {
    gridcell.setTextColor(getResources()
      .getColor(R.color.lightgray));
   }
   if (day_color[1].equals("WHITE")) {
    gridcell.setTextColor(getResources().getColor(
      R.color.lightgray02));
   }
   if (day_color[1].equals("BLUE")) {
    gridcell.setTextColor(getResources().getColor(R.color.orrange));
   }
   return row;
  }

  @Override
  public void onClick(View view) {
   String date_month_year = (String) view.getTag();
   selectedDayMonthYearButton.setText("Selected: " + date_month_year);
   Log.e("Selected date", date_month_year);
   try {
    Date parsedDate = dateFormatter.parse(date_month_year);
    Log.d(tag, "Parsed Date: " + parsedDate.toString());

   } catch (ParseException e) {
    e.printStackTrace();
   }
  }

  public int getCurrentDayOfMonth() {
   return currentDayOfMonth;
  }

  private void setCurrentDayOfMonth(int currentDayOfMonth) {
   this.currentDayOfMonth = currentDayOfMonth;
  }

  public void setCurrentWeekDay(int currentWeekDay) {
   this.currentWeekDay = currentWeekDay;
  }

  public int getCurrentWeekDay() {
   return currentWeekDay;
  }
 }
}

3-my_calendar_view.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:background="@color/lightgray"
    android:orientation="vertical" >

    <LinearLayout
        android:id="@+id/buttonlayout"
        android:layout_width="fill_parent"
        android:layout_height="60sp"
        android:background="@drawable/topbar"
        android:gravity="left|top"
        android:height="60sp"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/settings"
            android:layout_width="54sp"
            android:layout_height="60sp"
            android:background="@drawable/meenu" />

        <ImageView
            android:id="@+id/prevMonth"
            android:layout_width="20sp"
            android:layout_height="fill_parent"
            android:layout_gravity="center"
            android:layout_marginLeft="10sp"
            android:src="@drawable/calendar_left_arrow_selector" >
        </ImageView>

        <TextView
            android:id="@+id/currentMonth"
            android:layout_width="fill_parent"
            android:layout_height="60sp"
            android:layout_weight="0.6"
            android:gravity="center"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:textColor="#FFFFFF" >
        </TextView>

        <ImageView
            android:id="@+id/nextMonth"
            android:layout_width="20sp"
            android:layout_height="fill_parent"
            android:layout_gravity="center"
            android:layout_marginRight="10sp"
            android:src="@drawable/calendar_right_arrow_selector" >
        </ImageView>

        <Button
            android:id="@+id/addEvent"
            android:layout_width="54sp"
            android:layout_height="60sp"
            android:background="@drawable/plus" />
    </LinearLayout>

    <Button
        android:id="@+id/selectedDayMonthYear"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:background="@drawable/calendar_top_header"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:textColor="#FFFFFF" >
    </Button>

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center" >

        <ImageView
            android:id="@+id/calendarheader"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:src="@drawable/calendar_days" >
        </ImageView>
    </LinearLayout>

    <GridView
        android:id="@+id/calendar"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:numColumns="7" >
    </GridView>

</LinearLayout>

4-screen_gridcell.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@drawable/calendar_button_selector"
    android:orientation="vertical" >

    <Button
        android:id="@+id/calendar_day_gridcell"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:background="@drawable/calendar_button_selector"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:textColor="#FFFFFF" >
    </Button>

    <TextView
        android:id="@+id/num_events_per_day"
        style="@style/calendar_event_style"
        android:layout_width="10dip"
        android:layout_height="10dip"
        android:layout_gravity="right" >
    </TextView>

</RelativeLayout>

5-ZIP CODE(Download here!)

Hope it will help you...
Thanks...