Fortunately I have found some help from developer site and able to get all available calendars and show them with dynamic Checkpreferences.
hope my code will help some one in future.
CalendarPreference.java
public class CalendarPreference extends PreferenceActivity{
private static final String CALENDAR_ID = "calendarId";
private static final String[] PROJECTION = new String[] { Calendars._ID,
Calendars.CALENDAR_DISPLAY_NAME, Calendars.CALENDAR_COLOR };
private Set<String> initialActiveCalendars;
CheckBoxPreference mCheckBoxPreference;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.calendaraccounts);
SharedPreferences prefs = getPreferenceManager().getSharedPreferences();
initialActiveCalendars = prefs.getStringSet("PREF_ACTIVE_CALENDARS", null);
populatePreferenceScreen(initialActiveCalendars);
}
private void populatePreferenceScreen(Set<String> activeCalendars) {
Cursor cursor = createLoadedCursor();
if (cursor == null) {
return;
}
for (int i = 0; i < cursor.getCount(); i++) {
cursor.moveToPosition(i);
CheckBoxPreference checkboxPref = new CheckBoxPreference(this);
checkboxPref.setTitle(cursor.getString(1));
checkboxPref.setIcon(createDrawable(cursor.getInt(2)));
int calendarId = cursor.getInt(0);
checkboxPref.getExtras().putInt(CALENDAR_ID, calendarId);
checkboxPref.setChecked(activeCalendars == null
|| activeCalendars.contains(String.valueOf(calendarId)));
getPreferenceScreen().addPreference(checkboxPref);
}
}
@Override
public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
return true;
}
private Cursor createLoadedCursor() {
Uri.Builder builder = Calendars.CONTENT_URI.buildUpon();
ContentResolver contentResolver = getContentResolver();
return contentResolver.query(builder.build(), PROJECTION, null, null, null);
}
@Override
public void onPause() {
super.onPause();
HashSet<String> selectedCalendars = getSelectedCalenders();
if (!selectedCalendars.equals(initialActiveCalendars)) {
persistSelectedCalendars(selectedCalendars);
Log.v("Selected Calendars", selectedCalendars.toString());
NewWidget.updateAllWidgets(this);
}
}
private void persistSelectedCalendars(HashSet<String> prefValues) {
SharedPreferences prefs = getPreferenceManager().getSharedPreferences();
Editor editor = prefs.edit();
editor.putStringSet("PREF_ACTIVE_CALENDARS", prefValues);
editor.commit();
}
private HashSet<String> getSelectedCalenders() {
PreferenceScreen preferenceScreen = getPreferenceScreen();
int prefCount = preferenceScreen.getPreferenceCount();
HashSet<String> prefValues = new HashSet<String>();
for (int i = 0; i < prefCount; i++) {
Preference pref = preferenceScreen.getPreference(i);
if (pref instanceof CheckBoxPreference) {
CheckBoxPreference checkPref = (CheckBoxPreference) pref;
if (checkPref.isChecked()) {
prefValues.add(String.valueOf(checkPref.getExtras().getInt(CALENDAR_ID)));
}
}
}
return prefValues;
}
private Drawable createDrawable(int color) {
Drawable drawable = getResources().getDrawable(R.drawable.prefs_calendar_entry);
drawable.setColorFilter(new LightingColorFilter(0x0, color));
return drawable;
}
}
And here res/xml/calendaraccounts.xml
<PreferenceScreen>
</PreferenceScreen>