CRUD operations using Calendar Provider in Android

Required permissions in the manifest file.

<uses-permission android:name="android.permission.READ_CALENDAR" />
<uses-permission android:name="android.permission.WRITE_CALENDAR" />

Get all the calendars from the calendar content provider.

public void getCalendars() {
    if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CALENDAR) != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_CALENDAR}, MY_PERMISSIONS_REQUEST_WRITE_CALENDAR);
        return;
    }

    // Projection array. Creating indices for this array instead of doing dynamic lookups improves performance.
    final String[] EVENT_PROJECTION = new String[] {
            CalendarContract.Calendars._ID,                           // 0
            CalendarContract.Calendars.ACCOUNT_NAME,                  // 1
            CalendarContract.Calendars.CALENDAR_DISPLAY_NAME,         // 2
            CalendarContract.Calendars.OWNER_ACCOUNT                  // 3
    };

    // The indices for the projection array above.
    final int PROJECTION_ID_INDEX = 0;
    final int PROJECTION_ACCOUNT_NAME_INDEX = 1;
    final int PROJECTION_DISPLAY_NAME_INDEX = 2;
    final int PROJECTION_OWNER_ACCOUNT_INDEX = 3;


    ContentResolver contentResolver = getContentResolver();
    Cursor cur = contentResolver.query(CalendarContract.Calendars.CONTENT_URI, EVENT_PROJECTION, null, null, null);

    ArrayList<String> calendarInfos = new ArrayList<>();
    while (cur.moveToNext()) {
        long calID = 0;
        String displayName = null;
        String accountName = null;
        String ownerName = null;

        // Get the field values
        calID = cur.getLong(PROJECTION_ID_INDEX);
        displayName = cur.getString(PROJECTION_DISPLAY_NAME_INDEX);
        accountName = cur.getString(PROJECTION_ACCOUNT_NAME_INDEX);
        ownerName = cur.getString(PROJECTION_OWNER_ACCOUNT_INDEX);

        String calendarInfo = String.format("Calendar ID: %s\nDisplay Name: %s\nAccount Name: %s\nOwner Name: %s", calID, displayName, accountName, ownerName);
        calendarInfos.add(calendarInfo);
    }

    ArrayAdapter<String> stringArrayAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, android.R.id.text1, calendarInfos);
    listView.setAdapter(stringArrayAdapter);
}

Get the primary calendar from the calendar content provider.

public void getPrimaryCalendar() {
    if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CALENDAR) != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_CALENDAR}, MY_PERMISSIONS_REQUEST_WRITE_CALENDAR);
        return;
    }

    // Projection array. Creating indices for this array instead of doing dynamic lookups improves performance.
    final String[] EVENT_PROJECTION = new String[] {
            CalendarContract.Calendars._ID,                           // 0
            CalendarContract.Calendars.ACCOUNT_NAME,                  // 1
            CalendarContract.Calendars.CALENDAR_DISPLAY_NAME,         // 2
            CalendarContract.Calendars.OWNER_ACCOUNT                  // 3
    };

    // The indices for the projection array above.
    final int PROJECTION_ID_INDEX = 0;
    final int PROJECTION_ACCOUNT_NAME_INDEX = 1;
    final int PROJECTION_DISPLAY_NAME_INDEX = 2;
    final int PROJECTION_OWNER_ACCOUNT_INDEX = 3;

    ContentResolver contentResolver = getContentResolver();
    String selection = CalendarContract.Calendars.VISIBLE + " = 1 AND "  + CalendarContract.Calendars.IS_PRIMARY + "=1";
    Cursor cur = contentResolver.query(CalendarContract.Calendars.CONTENT_URI, EVENT_PROJECTION, selection, null, null);

    ArrayList<String> calendarInfos = new ArrayList<>();
    while (cur.moveToNext()) {
        long calID = 0;
        String displayName = null;
        String accountName = null;
        String ownerName = null;

        // Get the field values
        calID = cur.getLong(PROJECTION_ID_INDEX);
        displayName = cur.getString(PROJECTION_DISPLAY_NAME_INDEX);
        accountName = cur.getString(PROJECTION_ACCOUNT_NAME_INDEX);
        ownerName = cur.getString(PROJECTION_OWNER_ACCOUNT_INDEX);

        String calendarInfo = String.format("Calendar ID: %s\nDisplay Name: %s\nAccount Name: %s\nOwner Name: %s", calID, displayName, accountName, ownerName);
        calendarInfos.add(calendarInfo);
    }

    ArrayAdapter<String> stringArrayAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, android.R.id.text1, calendarInfos);
    listView.setAdapter(stringArrayAdapter);
}

Get the calendar by account from the calendar content provider.

public void readCalendarsByAccount(View view) {
    if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CALENDAR) != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_CALENDAR}, MY_PERMISSIONS_REQUEST_WRITE_CALENDAR);
        return;
    }

    // Projection array. Creating indices for this array instead of doing dynamic lookups improves performance.
    final String[] EVENT_PROJECTION = new String[] {
            CalendarContract.Calendars._ID,                           // 0
            CalendarContract.Calendars.ACCOUNT_NAME,                  // 1
            CalendarContract.Calendars.CALENDAR_DISPLAY_NAME,         // 2
            CalendarContract.Calendars.OWNER_ACCOUNT                  // 3
    };

    // The indices for the projection array above.
    final int PROJECTION_ID_INDEX = 0;
    final int PROJECTION_ACCOUNT_NAME_INDEX = 1;
    final int PROJECTION_DISPLAY_NAME_INDEX = 2;
    final int PROJECTION_OWNER_ACCOUNT_INDEX = 3;

    // Run query
    Cursor cur = null;
    ContentResolver cr = getContentResolver();
    Uri uri = CalendarContract.Calendars.CONTENT_URI;
    String selection = "((" + CalendarContract.Calendars.ACCOUNT_NAME + " = ?) AND ("
            + CalendarContract.Calendars.ACCOUNT_TYPE + " = ?) AND ("
            + CalendarContract.Calendars.OWNER_ACCOUNT + " = ?))";
    String[] selectionArgs = new String[] {"test@gmail.com", "com.google", "test@gmail.com"};
    // Submit the query and get a Cursor object back.
    cur = cr.query(uri, EVENT_PROJECTION, selection, selectionArgs, null);

    // Use the cursor to step through the returned records
    ArrayList<String> calendars = new ArrayList<>();
    while (cur.moveToNext()) {
        long calID = 0;
        String displayName = null;
        String accountName = null;
        String ownerName = null;

        // Get the field values
        calID = cur.getLong(PROJECTION_ID_INDEX);
        displayName = cur.getString(PROJECTION_DISPLAY_NAME_INDEX);
        accountName = cur.getString(PROJECTION_ACCOUNT_NAME_INDEX);
        ownerName = cur.getString(PROJECTION_OWNER_ACCOUNT_INDEX);

        String calendarInfo = String.format("Calendar ID: %s\nDisplay Name: %s\nAccount Name: %s\nOwner Name: %s", calID, displayName, accountName, ownerName);
        calendars.add(calendarInfo);
    }

    ArrayAdapter<String> stringArrayAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, android.R.id.text1, calendars);
    listView.setAdapter(stringArrayAdapter);
}

Check if an event already exist on the calendar by event title.

private boolean isEventAlreadyExist(String eventTitle) {
    final String[] INSTANCE_PROJECTION = new String[] {
            CalendarContract.Instances.EVENT_ID,      // 0
            CalendarContract.Instances.BEGIN,         // 1
            CalendarContract.Instances.TITLE          // 2
    };

    long startMillis = 0;
    long endMillis = 0;
    Calendar beginTime = Calendar.getInstance();
    beginTime.set(2017, 11, 15, 6, 00);
    startMillis = beginTime.getTimeInMillis();
    Calendar endTime = Calendar.getInstance();
    endTime.set(2017, 11, 15, 8, 00);
    endMillis = endTime.getTimeInMillis();

    // The ID of the recurring event whose instances you are searching for in the Instances table
    String selection = CalendarContract.Instances.TITLE + " = ?";
    String[] selectionArgs = new String[] {eventTitle};

    // Construct the query with the desired date range.
    Uri.Builder builder = CalendarContract.Instances.CONTENT_URI.buildUpon();
    ContentUris.appendId(builder, startMillis);
    ContentUris.appendId(builder, endMillis);

    // Submit the query
    Cursor cur =  getContentResolver().query(builder.build(), INSTANCE_PROJECTION, selection, selectionArgs, null);

    return cur.getCount() > 0;
}

Add an event to the calendar through calendar content provider.

public void addEvent() {
    String eventTitle = "Jazzercise";
    if (isEventAlreadyExist(eventTitle)) {
        Snackbar.make(view, "Jazzercise event already exist!", Snackbar.LENGTH_SHORT).show();
        return;
    }

    long calID = 3;
    long startMillis = 0;
    long endMillis = 0;
    Calendar beginTime = Calendar.getInstance();
    beginTime.set(2017, 11, 15, 6, 00);
    startMillis = beginTime.getTimeInMillis();
    Calendar endTime = Calendar.getInstance();
    endTime.set(2017, 11, 15, 8, 00);
    endMillis = endTime.getTimeInMillis();

    ContentResolver cr = getContentResolver();
    ContentValues values = new ContentValues();
    values.put(CalendarContract.Events.DTSTART, startMillis);
    values.put(CalendarContract.Events.DTEND, endMillis);
    values.put(CalendarContract.Events.TITLE, "Jazzercise");
    values.put(CalendarContract.Events.DESCRIPTION, "Group workout");
    values.put(CalendarContract.Events.CALENDAR_ID, calID);
    values.put(CalendarContract.Events.EVENT_TIMEZONE, "America/Los_Angeles");
    values.put(CalendarContract.Events.ORGANIZER, "google_calendar@gmail.com");

    if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_CALENDAR) == PackageManager.PERMISSION_GRANTED) {
        Uri uri = cr.insert(CalendarContract.Events.CONTENT_URI, values);
        long eventID = Long.parseLong(uri.getLastPathSegment());
        Log.i("Calendar", "Event Created, the event id is: " + eventID);
        Snackbar.make(view, "Jazzercise event added!", Snackbar.LENGTH_SHORT).show();
    } else {
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_CALENDAR}, MY_PERMISSIONS_REQUEST_WRITE_CALENDAR);
    }

}

Remove an event from calendar by event title and time through calendar content provider.

public void removeEvent(View view) {
    String eventTitle = "Jazzercise";

    final String[] INSTANCE_PROJECTION = new String[] {
            CalendarContract.Instances.EVENT_ID,      // 0
            CalendarContract.Instances.BEGIN,         // 1
            CalendarContract.Instances.TITLE          // 2
    };
    // The indices for the projection array above.
    final int PROJECTION_ID_INDEX = 0;
    final int PROJECTION_BEGIN_INDEX = 1;
    final int PROJECTION_TITLE_INDEX = 2;

    // Specify the date range you want to search for recurring event instances
    Calendar beginTime = Calendar.getInstance();
    beginTime.set(2017, 9, 23, 8, 0);
    long startMillis = beginTime.getTimeInMillis();
    Calendar endTime = Calendar.getInstance();
    endTime.set(2018, 1, 24, 8, 0);
    long endMillis = endTime.getTimeInMillis();


    // The ID of the recurring event whose instances you are searching for in the Instances table
    String selection = CalendarContract.Instances.TITLE + " = ?";
    String[] selectionArgs = new String[] {eventTitle};

    // Construct the query with the desired date range.
    Uri.Builder builder = CalendarContract.Instances.CONTENT_URI.buildUpon();
    ContentUris.appendId(builder, startMillis);
    ContentUris.appendId(builder, endMillis);

    // Submit the query
    Cursor cur =  getContentResolver().query(builder.build(), INSTANCE_PROJECTION, selection, selectionArgs, null);

    while(cur.moveToNext()) {
        // Get the field values
        long eventID = cur.getLong(PROJECTION_ID_INDEX);
        long beginVal = cur.getLong(PROJECTION_BEGIN_INDEX);
        String title = cur.getString(PROJECTION_TITLE_INDEX);

        Uri deleteUri = null;
        deleteUri = ContentUris.withAppendedId(CalendarContract.Events.CONTENT_URI, eventID);
        int rows = getContentResolver().delete(deleteUri, null, null);
        Log.i("Calendar", "Rows deleted: " + rows);
    }

}

Get events from calendar by event title through calendar content provider.

private void showEvents(String eventTitle) {
    final String[] INSTANCE_PROJECTION = new String[] {
            CalendarContract.Instances.EVENT_ID,       // 0
            CalendarContract.Instances.BEGIN,         // 1
            CalendarContract.Instances.TITLE,        // 2
            CalendarContract.Instances.ORGANIZER    //3
    };

    // The indices for the projection array above.
    final int PROJECTION_ID_INDEX = 0;
    final int PROJECTION_BEGIN_INDEX = 1;
    final int PROJECTION_TITLE_INDEX = 2;
    final int PROJECTION_ORGANIZER_INDEX = 3;

    // Specify the date range you want to search for recurring event instances
    Calendar beginTime = Calendar.getInstance();
    beginTime.set(2017, 9, 23, 8, 0);
    long startMillis = beginTime.getTimeInMillis();
    Calendar endTime = Calendar.getInstance();
    endTime.set(2018, 1, 24, 8, 0);
    long endMillis = endTime.getTimeInMillis();


    // The ID of the recurring event whose instances you are searching for in the Instances table
    String selection = CalendarContract.Instances.TITLE + " = ?";
    String[] selectionArgs = new String[] {eventTitle};

    // Construct the query with the desired date range.
    Uri.Builder builder = CalendarContract.Instances.CONTENT_URI.buildUpon();
    ContentUris.appendId(builder, startMillis);
    ContentUris.appendId(builder, endMillis);

    // Submit the query
    Cursor cur =  getContentResolver().query(builder.build(), INSTANCE_PROJECTION, selection, selectionArgs, null);


    ArrayList<String> events = new ArrayList<>();
    while (cur.moveToNext()) {
        // Get the field values
        long eventID = cur.getLong(PROJECTION_ID_INDEX);
        long beginVal = cur.getLong(PROJECTION_BEGIN_INDEX);
        String title = cur.getString(PROJECTION_TITLE_INDEX);
        String organizer = cur.getString(PROJECTION_ORGANIZER_INDEX);

        // Do something with the values.
        Log.i("Calendar", "Event:  " + title);
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(beginVal);
        DateFormat formatter = new SimpleDateFormat("MM/dd/yyyy");
        Log.i("Calendar", "Date: " + formatter.format(calendar.getTime()));

        events.add(String.format("Event: %s\nOrganizer: %s\nDate: %s", title, organizer, formatter.format(calendar.getTime())));
    }

    ArrayAdapter<String> stringArrayAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, android.R.id.text1, events);
    listView.setAdapter(stringArrayAdapter);
}

Show all events from calendar in a time range using calendar content provider.

public void readEvents(View view) {
    final String[] INSTANCE_PROJECTION = new String[] {
            CalendarContract.Instances.EVENT_ID,      // 0
            CalendarContract.Instances.BEGIN,         // 1
            CalendarContract.Instances.TITLE,          // 2
            CalendarContract.Instances.ORGANIZER
    };

    // The indices for the projection array above.
    final int PROJECTION_ID_INDEX = 0;
    final int PROJECTION_BEGIN_INDEX = 1;
    final int PROJECTION_TITLE_INDEX = 2;
    final int PROJECTION_ORGANIZER_INDEX = 3;

    // Specify the date range you want to search for recurring event instances
    Calendar beginTime = Calendar.getInstance();
    beginTime.set(2017, 9, 23, 8, 0);
    long startMillis = beginTime.getTimeInMillis();
    Calendar endTime = Calendar.getInstance();
    endTime.set(2018, 1, 24, 8, 0);
    long endMillis = endTime.getTimeInMillis();


    // The ID of the recurring event whose instances you are searching for in the Instances table
    String selection = CalendarContract.Instances.EVENT_ID + " = ?";
    String[] selectionArgs = new String[] {"207"};

    // Construct the query with the desired date range.
    Uri.Builder builder = CalendarContract.Instances.CONTENT_URI.buildUpon();
    ContentUris.appendId(builder, startMillis);
    ContentUris.appendId(builder, endMillis);

    // Submit the query
    Cursor cur =  getContentResolver().query(builder.build(), INSTANCE_PROJECTION, null, null, null);


    ArrayList<String> events = new ArrayList<>();
    while (cur.moveToNext()) {

        // Get the field values
        long eventID = cur.getLong(PROJECTION_ID_INDEX);
        long beginVal = cur.getLong(PROJECTION_BEGIN_INDEX);
        String title = cur.getString(PROJECTION_TITLE_INDEX);
        String organizer = cur.getString(PROJECTION_ORGANIZER_INDEX);

        // Do something with the values.
        Log.i("Calendar", "Event:  " + title);
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(beginVal);
        DateFormat formatter = new SimpleDateFormat("MM/dd/yyyy");
        Log.i("Calendar", "Date: " + formatter.format(calendar.getTime()));

        events.add(String.format("Event: %s\nOrganizer: %s\nDate: %s", title, organizer, formatter.format(calendar.getTime())));
    }

    ArrayAdapter<String> stringArrayAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, android.R.id.text1, events);
    listView.setAdapter(stringArrayAdapter);
}

Update an event from calendar by event id.

private void updateEvent(long eventID) {
    ContentResolver cr = getContentResolver();
    ContentValues values = new ContentValues();
    values.put(CalendarContract.Events.TITLE, "Kickboxing");
    Uri updateUri = ContentUris.withAppendedId(CalendarContract.Events.CONTENT_URI, eventID);
    int rows = getContentResolver().update(updateUri, values, null, null);
    Log.i("Calendar", "Rows updated: " + rows);
}

Delete an event from calendar by event id.

private void deleteEvent(long eventID) {
    Uri deleteUri = ContentUris.withAppendedId(CalendarContract.Events.CONTENT_URI, eventID);
    int rows = getContentResolver().delete(deleteUri, null, null);
    Log.i("Calendar", "Rows deleted: " + rows);
}

Complete example in Github

Reference:
https://developer.android.com/guide/topics/providers/calendar-provider.html