1) https://stackandroid.com/tutorial/contact-picker-using-intent-android-tutorial/
2) https://github.com/sachinmuralig/simple-multi-contact-picker
3) https://stackoverflow.com/questions/15620805/how-to-select-multiple-contacts-from-the-phone-using-checkboxes?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa
2) https://github.com/sachinmuralig/simple-multi-contact-picker
3) https://stackoverflow.com/questions/15620805/how-to-select-multiple-contacts-from-the-phone-using-checkboxes?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa
