READ CONTACT INFORMATION ( NAME, NICKNAME, NUMBER, EMAIL, ADDRESS, BIRTHDAY, ANNIVERSARY, NOTE, ORGANISATION, ACCOUNTS) IN ANDROID

In this tutorial we will read the contact information present in android device like name, nickname, number,
pic, address, birthday, anniversary, note, organisation, accounts.

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For reading contacts we require permission READ_CONTACTS and for reading accounts GET_ACCOUNTS so add these two permissions in AndroidManifest.xml

<uses-permission android:name="android.permission.GET_ACCOUNTS"/> <uses-permission android:name="android.permission.READ_CONTACTS"/>

AndroidManifest.xml <manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="com.tutorialsface.contact"     android:versionCode="1"     android:versionName="1.0" >     <uses-sdk         android:minSdkVersion="8"         android:targetSdkVersion="19" />     <uses-permission android:name="android.permission.GET_ACCOUNTS" />     <uses-permission android:name="android.permission.READ_CONTACTS" />     <application         android:allowBackup="true"         android:icon="@drawable/ic_launcher"         android:label="@string/app_name"         android:theme="@style/AppTheme" >         <activity android:name="com.tutorialsface.contact.MainActivity" >             <intent-filter>                 <action android:name="android.intent.action.MAIN" />                 <category android:name="android.intent.category.LAUNCHER" />             </intent-filter>         </activity>     </application> </manifest>

Create a model class ContactData.java.

ContactData.java import android.graphics.Bitmap; public class ContactData {       private int id;       private String name;       String nickName;       private String phoneNumber;       private int favourite;       private int type;       private String label;       private int account_id;       private int system_contact_id;       private String account_name;       private String account_type;       private String company;       private String title;       private String note;       private String date;       private String email;       private String street;       private String poBox;       private String neighborhood;       private String city;       private String region;       private String postCode;       private String country;       private Bitmap image;       public int getId() {             return id;       }       public void setId(int id) {             this.id = id;       }       public String getName() {             return name;       }       public void setName(String name) {             this.name = name;       }       public int getFavourite() {             return favourite;       }       public void setFavourite(int favourite) {             this.favourite = favourite;       }       public int getType() {             return type;       }       public void setType(int type) {             this.type = type;       }       public String getLabel() {             return label;       }       public void setLabel(String label) {             this.label = label;       }       public int getAccount_id() {             return account_id;       }       public void setAccount_id(int account_id) {             this.account_id = account_id;       }       public int getSystem_contact_id() {             return system_contact_id;       }       public void setSystem_contact_id(int system_contact_id) {             this.system_contact_id = system_contact_id;       }       public String getAccount_name() {             return account_name;       }       public void setAccount_name(String account_name) {             this.account_name = account_name;       }       public String getAccount_type() {             return account_type;       }       public void setAccount_type(String account_type) {             this.account_type = account_type;       }       public String getCompany() {             return company;       }       public void setCompany(String company) {             this.company = company;       }       public String getTitle() {             return title;       }       public void setTitle(String title) {             this.title = title;       }       public String getNote() {             return note;       }       public void setNote(String note) {             this.note = note;       }       public String getDate() {             return date;       }       public void setDate(String date) {             this.date = date;       }       public String getEmail() {             return email;       }       public void setEmail(String email) {             this.email = email;       }       public String getNickName() {             return nickName;       }       public void setNickName(String nickName) {             this.nickName = nickName;       }       public String getStreet() {             return street;       }       public void setStreet(String street) {             this.street = street;       }       public String getPoBox() {             return poBox;       }       public void setPoBox(String poBox) {             this.poBox = poBox;       }       public String getNeighborhood() {             return neighborhood;       }       public void setNeighborhood(String neighborhood) {             this.neighborhood = neighborhood;       }       public String getCity() {             return city;       }       public void setCity(String city) {             this.city = city;       }       public String getRegion() {             return region;       }       public void setRegion(String region) {             this.region = region;       }       public String getPostCode() {             return postCode;       }       public void setPostCode(String postCode) {             this.postCode = postCode;       }       public String getCountry() {             return country;       }       public void setCountry(String country) {             this.country = country;       }       public String getPhoneNumber() {             return phoneNumber;       }       public void setPhoneNumber(String phoneNumber) {             this.phoneNumber = phoneNumber;       }       public Bitmap getImage() {             return image;       }       public void setImage(Bitmap image) {             this.image = image;       } }

And lastly the PhoneContact.java in which all function will be written for fetching data and store in ArrayList.

PhoneContact.java import java.util.ArrayList; import android.accounts.Account; import android.accounts.AccountManager; import android.content.ContentResolver; import android.content.Context; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.net.Uri; import android.provider.ContactsContract; import android.util.Log; public class PhoneContact {       String LOG_CLASS = "PhoneContact";             Context context;       ContentResolver cr;       ArrayList<ContactData> accountMapList = null;       ArrayList<ContactData> accountList = null;       ArrayList<ContactData> organisationList = null;       ArrayList<ContactData> noteList = null;       ArrayList<ContactData> eventList = null;       ArrayList<ContactData> addressList = null;       ArrayList<ContactData> emailList = null;       ArrayList<ContactData> phoneList = null;       ArrayList<ContactData> contactList = null;       ArrayList<ContactData> favouriteList = null;       ArrayList<ContactData> imageList = null;             public PhoneContact(Context context){             this.context = context;             cr = context.getContentResolver();             accountMapList = new ArrayList<ContactData>();             accountList = new ArrayList<ContactData>();             organisationList = new ArrayList<ContactData>();             noteList = new ArrayList<ContactData>();             eventList = new ArrayList<ContactData>();             addressList = new ArrayList<ContactData>();             emailList = new ArrayList<ContactData>();             phoneList = new ArrayList<ContactData>();             contactList = new ArrayList<ContactData>();             favouriteList = new ArrayList<ContactData>();             imageList = new ArrayList<ContactData>();             contactDetails();       }             public void contactDetails(){             Uri URI_NICK_NAME = ContactsContract.Data.CONTENT_URI;                         readAccountNames();             Cursor cursor = cr.query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null);             if(cursor.getCount() > 0){                   Log.v(LOG_CLASS, LOG_CLASS +"contactNumbers->" + cursor.getCount());                   cursor.moveToFirst();                   while(!cursor.isAfterLast()){                         //ContactId of Contact                         int systemContactId = cursor.getInt(cursor.getColumnIndex(ContactsContract.Contacts._ID));                         Log.v(LOG_CLASS, LOG_CLASS +"Contact Id:- " + systemContactId);                         //Name of Contact                         String name = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));                         Log.v(LOG_CLASS, LOG_CLASS +"Name:- " + name);                         String nickName = "";                         //NickName of Contact                         String SELECTION_NICK_NAME = ContactsContract.Data.CONTACT_ID + " = ? AND " + ContactsContract.Data.MIMETYPE + " = ?";                         String[] SELECTION_ARRAY_NICK_NAME = new String[] {                                                             String.valueOf(systemContactId),                                                  ContactsContract.CommonDataKinds.Nickname.CONTENT_ITEM_TYPE };                                                 Cursor currNickName = cr.query(URI_NICK_NAME, null,                                                  SELECTION_NICK_NAME, SELECTION_ARRAY_NICK_NAME,                                                  null);                         if (currNickName.getCount() > 0) {                               currNickName.moveToFirst();                               int indexNickName = currNickName.getColumnIndex(ContactsContract.CommonDataKinds.Nickname.NAME);                               nickName = currNickName.getString(indexNickName);                               Log.v(LOG_CLASS, LOG_CLASS +"Nick Name:- " + nickName);                         }                         currNickName.close();                         ContactData dataContact = new ContactData();                         dataContact.setSystem_contact_id(systemContactId);                         dataContact.setName(name);                         dataContact.setNickName(nickName);                         contactList.add(dataContact);                         //Number of Contact(cc,actualNumber, label, type, fav)                         readContactNumbers(systemContactId);                         //Email of Contact(email, label, type)                 readEmailAddress(systemContactId);                 //Address of Contact(street, poBox, neighborhood, city, region, postCOde, country,label, type)                 readAddress(systemContactId);                 //Event of Contact(date, label, type)                 readEvents(systemContactId);                         //Note of contact(note)                 readNote(systemContactId);                 //Organisation of contact(company, title, type, label)                         readOrganisation(systemContactId);                         //Account of contact(accountId, contactId)                         readAccountMapping(systemContactId);                         //Image of contact                         getImageOfContact(systemContactId);                         cursor.moveToNext();                   }                   cursor.close();             }             //read favourite Contacts             readFavouriteContacts();       }             private void readContactNumbers(int systemContactId) {             Uri URI_PHONE = ContactsContract.CommonDataKinds.Phone.CONTENT_URI;             String[] PROJECTION_PHONE = new String[] {                 ContactsContract.CommonDataKinds.Phone.NUMBER,                 ContactsContract.CommonDataKinds.Phone.LABEL,                 ContactsContract.CommonDataKinds.Phone.TYPE};            String SELECTION_PHONE = ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = ?";            String[] SELECTION_ARRAY_PHONE = new String[] { String.valueOf(systemContactId) };                         Cursor curPhone = cr.query(URI_PHONE, PROJECTION_PHONE, SELECTION_PHONE, SELECTION_ARRAY_PHONE, null);             if(curPhone.getCount() > 0 ){                   curPhone.moveToFirst();                   int indexNumber = curPhone.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER);               int labelIndex = curPhone.getColumnIndex(ContactsContract.CommonDataKinds.Phone.LABEL);                   int indexPhoneType = curPhone.getColumnIndex(ContactsContract.CommonDataKinds.Phone.TYPE);                   while(!curPhone.isAfterLast()){                         ContactData dataPhone = new ContactData();                   String contactNumber = curPhone.getString(indexNumber);                   String labelName = "";                   int labelType = curPhone.getInt(indexPhoneType);                   if(labelType == ContactsContract.CommonDataKinds.Phone.TYPE_CUSTOM){                         labelName = curPhone.getString(labelIndex);                   }                   dataPhone.setSystem_contact_id(systemContactId);                   dataPhone.setPhoneNumber(contactNumber);                   dataPhone.setType(labelType);                   dataPhone.setLabel(labelName);                   phoneList.add(dataPhone);                   Log.v(LOG_CLASS, LOG_CLASS +"Number:- " + contactNumber + "[" + labelType + "] " + labelName);                         curPhone.moveToNext();                   }             }             curPhone.close();       }             private void readEmailAddress(int systemContactId) {             Uri URI_EMAIL = ContactsContract.CommonDataKinds.Email.CONTENT_URI;             String[] PROJECTION_EMAIL = new String[]{                         ContactsContract.CommonDataKinds.Email.DATA,                         ContactsContract.CommonDataKinds.Email.TYPE,                         ContactsContract.CommonDataKinds.Email.LABEL};             String SELECTION_EMAIL = ContactsContract.CommonDataKinds.Email.CONTACT_ID+ " = ?";         String[] SELECTION_ARRAY_EMAIL = new String[] { String.valueOf(systemContactId) };         Cursor curEmail = cr.query(URI_EMAIL, PROJECTION_EMAIL, SELECTION_EMAIL, SELECTION_ARRAY_EMAIL, null);         if(curEmail.getCount() > 0){             curEmail.moveToFirst();             int indexEmail = curEmail.getColumnIndex(ContactsContract.CommonDataKinds.Email.DATA);             int indexEmailType = curEmail.getColumnIndex(ContactsContract.CommonDataKinds.Email.TYPE);             int indexEmailLabel = curEmail.getColumnIndex(ContactsContract.CommonDataKinds.Email.LABEL);             while(!curEmail.isAfterLast()){                   ContactData dataEmail= new ContactData();                   String labelName = "";                   String emailStr = curEmail.getString(indexEmail);                 int emailType = curEmail.getInt(indexEmailType);                 if(emailType == ContactsContract.CommonDataKinds.Email.TYPE_CUSTOM){                         labelName = curEmail.getString(indexEmailLabel);                   }                 dataEmail.setEmail(emailStr);                 dataEmail.setType(emailType);                 dataEmail.setLabel(labelName);                 emailList.add(dataEmail);                 Log.v(LOG_CLASS, LOG_CLASS +"Email:- " + emailStr + "[" + emailType + "] " + labelName);                   curEmail.moveToNext();             }         }         curEmail.close();       }             private void readAddress(int systemContactId) {             Uri URI_ADDRESS = ContactsContract.CommonDataKinds.StructuredPostal.CONTENT_URI;             String SELECTION_ADDRESS = ContactsContract.CommonDataKinds.StructuredPostal.CONTACT_ID + " = ? AND " +                   ContactsContract.CommonDataKinds.StructuredPostal.MIMETYPE + " = ?";         String[] SELECTION_ARRAY_ADDRESS = new String[]{                         String.valueOf(systemContactId),                         ContactsContract.CommonDataKinds.StructuredPostal.CONTENT_ITEM_TYPE};         Cursor currAddr = cr.query(URI_ADDRESS, null,SELECTION_ADDRESS, SELECTION_ARRAY_ADDRESS, null);         if (currAddr.getCount() > 0) {             currAddr.moveToFirst();             int indexAddType = currAddr.getColumnIndex(ContactsContract.CommonDataKinds.StructuredPostal.TYPE);             int indexAddLabel = currAddr.getColumnIndex(ContactsContract.CommonDataKinds.StructuredPostal.LABEL);             int indexStreet = currAddr.getColumnIndex(ContactsContract.CommonDataKinds.StructuredPostal.STREET);             int indexPOBox = currAddr.getColumnIndex(ContactsContract.CommonDataKinds.StructuredPostal.POBOX);             int indexNeighbor = currAddr.getColumnIndex(ContactsContract.CommonDataKinds.StructuredPostal.NEIGHBORHOOD);             int indexCity = currAddr.getColumnIndex(ContactsContract.CommonDataKinds.StructuredPostal.CITY);             int indexRegion = currAddr.getColumnIndex(ContactsContract.CommonDataKinds.StructuredPostal.REGION);             int indexPostCode = currAddr.getColumnIndex(ContactsContract.CommonDataKinds.StructuredPostal.POSTCODE);             int indexCountry = currAddr.getColumnIndex(ContactsContract.CommonDataKinds.StructuredPostal.COUNTRY);             while (!currAddr.isAfterLast()) {                   ContactData dataAddress = new ContactData();                   String street = currAddr.getString(indexStreet);                   String poBox = currAddr.getString(indexPOBox);                   String neighbor = currAddr.getString(indexNeighbor);                   String city = currAddr.getString(indexCity);                   String region = currAddr.getString(indexRegion);                   String postCode = currAddr.getString(indexPostCode);                   String country = currAddr.getString(indexCountry);                   int type = currAddr.getInt(indexAddType);                   String labelName = "";                   if(type == ContactsContract.CommonDataKinds.StructuredPostal.TYPE_CUSTOM){                         labelName = currAddr.getString(indexAddLabel);                   }                   dataAddress.setSystem_contact_id(systemContactId);                   dataAddress.setStreet(street);                   dataAddress.setPoBox(poBox);                   dataAddress.setNeighborhood(neighbor);                   dataAddress.setCity(city);                   dataAddress.setRegion(region);                   dataAddress.setPostCode(postCode);                   dataAddress.setCountry(country);                   dataAddress.setType(type);                   dataAddress.setLabel(labelName);                   addressList.add(dataAddress);                   Log.v(LOG_CLASS, LOG_CLASS +"Address:- " + street + "," + poBox + "," + neighbor + "," + city + "," + region + "," + postCode + "," + country +                                           "[" + type + "] " + labelName);                   currAddr.moveToNext();             }         }         currAddr.close();       }             private void readEvents(int systemContactId) {             Uri URI_EVENT = ContactsContract.Data.CONTENT_URI;             String SELECTION_EVENT = ContactsContract.Data.CONTACT_ID + " = ? AND " + ContactsContract.Data.MIMETYPE + " = ? ";             String[] SELECTION_ARRAY_EVENT = new String[] {                                                       String.valueOf(systemContactId),                                           ContactsContract.CommonDataKinds.Event.CONTENT_ITEM_TYPE };                               Cursor currEvent = cr.query(URI_EVENT, null, SELECTION_EVENT,SELECTION_ARRAY_EVENT, null);             if (currEvent.getCount() > 0) {                   currEvent.moveToNext();                   int indexEvent = currEvent.getColumnIndex(ContactsContract.CommonDataKinds.Event.START_DATE);                   int indexType = currEvent.getColumnIndex(ContactsContract.CommonDataKinds.Event.TYPE);                   int indexLabel = currEvent.getColumnIndex(ContactsContract.CommonDataKinds.Event.LABEL);                   while(!currEvent.isAfterLast()){                         ContactData dataEvent = new ContactData();                         String date = currEvent.getString(indexEvent);                         int type = currEvent.getInt(indexType);                         String label = "";                         if(type == ContactsContract.CommonDataKinds.Event.TYPE_CUSTOM){                               label = currEvent.getString(indexLabel);                         }                         dataEvent.setSystem_contact_id(systemContactId);                         dataEvent.setDate(date);                         dataEvent.setType(type);                         dataEvent.setLabel(label);                         eventList.add(dataEvent);                         Log.v(LOG_CLASS, LOG_CLASS +"Event:- " + date + "[" + type + "] " + label);                         currEvent.moveToNext();                   }             }             currEvent.close();       }                   private void readNote(int systemContactId) {             Uri URI_NOTE = ContactsContract.Data.CONTENT_URI;              String SELECTION_NOTE = ContactsContract.Data.CONTACT_ID + " = ? AND " + ContactsContract.Data.MIMETYPE + " = ?";          String[] SELECTION_ARRAY_NOTE = new String[] {                                           String.valueOf(systemContactId),                                  ContactsContract.CommonDataKinds.Note.CONTENT_ITEM_TYPE };          Cursor currNote = cr.query(URI_NOTE, null, SELECTION_NOTE,SELECTION_ARRAY_NOTE, null);          if(currNote.getCount() > 0){             ContactData dataNote = new ContactData();             currNote.moveToFirst();             int indexNote = currNote.getColumnIndex(ContactsContract.CommonDataKinds.Note.NOTE);             String note = currNote.getString(indexNote);             dataNote.setSystem_contact_id(systemContactId);             dataNote.setNote(note);             Log.v(LOG_CLASS, LOG_CLASS +"Note:- " + note);             noteList.add(dataNote);          }          currNote.close();       }             private void readOrganisation(int systemContactId) {             Uri URI_ORGNIZATION = ContactsContract.Data.CONTENT_URI;             String SELECTION_ORGNIZATION = ContactsContract.Data.CONTACT_ID + " = ? AND " + ContactsContract.Data.MIMETYPE + " = ?";             String[] SELECTION_ARRAY_ORGNIZATION = new String[] {                                                       String.valueOf(systemContactId),                                           ContactsContract.CommonDataKinds.Organization.CONTENT_ITEM_TYPE };                               Cursor currOrg = cr.query(URI_ORGNIZATION, null,SELECTION_ORGNIZATION, SELECTION_ARRAY_ORGNIZATION, null);             if(currOrg.getCount() > 0){                   int indexOrgType = currOrg.getColumnIndex(ContactsContract.CommonDataKinds.Organization.TYPE);                   int indexOrgLabel = currOrg.getColumnIndex(ContactsContract.CommonDataKinds.Organization.LABEL);                   int indexOrgName = currOrg.getColumnIndex(ContactsContract.CommonDataKinds.Organization.COMPANY);                   int indexOrgTitle = currOrg.getColumnIndex(ContactsContract.CommonDataKinds.Organization.TITLE);                   currOrg.moveToFirst();                   while(!currOrg.isAfterLast()){                         ContactData dataOrg = new ContactData();                         String company = currOrg.getString(indexOrgName);                         String title = currOrg.getString(indexOrgTitle);                         int type = currOrg.getInt(indexOrgType);                         String label = "";                         if(type == ContactsContract.CommonDataKinds.Organization.TYPE_CUSTOM){                               label = currOrg.getString(indexOrgLabel);                         }                         dataOrg.setSystem_contact_id(systemContactId);                         dataOrg.setCompany(company);                         dataOrg.setTitle(title);                         dataOrg.setType(type);                         dataOrg.setLabel(label);                         organisationList.add(dataOrg);                         Log.v(LOG_CLASS, LOG_CLASS +"Organisation:- " + company + ", " + title + "[" + type + "] " + label);                         currOrg.moveToNext();                   }             }             currOrg.close();       }             private void readAccountMapping(int systemContactId) {             Uri URI_ACCOUNTS = ContactsContract.RawContacts.CONTENT_URI;             String[] PROJECTION_ACCOUNT = new String[] {                         ContactsContract.RawContacts.ACCOUNT_NAME,                         ContactsContract.RawContacts.ACCOUNT_TYPE};             String SELECTION_ACCOUNT = ContactsContract.RawContacts.CONTACT_ID + " = ?";             String[] SELECTION_ARRAY_ACCOUNT = new String[] { String.valueOf(systemContactId) };             Cursor cursorAccount = cr.query(URI_ACCOUNTS,PROJECTION_ACCOUNT, SELECTION_ACCOUNT, SELECTION_ARRAY_ACCOUNT, null);             if (cursorAccount.getCount() > 0) {                   cursorAccount.moveToFirst();                   while(!cursorAccount.isAfterLast()){                         ContactData data = new ContactData();                         String name = cursorAccount.getString(cursorAccount.getColumnIndex(ContactsContract.RawContacts.ACCOUNT_NAME));                         String type = cursorAccount.getString(cursorAccount.getColumnIndex(ContactsContract.RawContacts.ACCOUNT_TYPE));                         data.setAccount_name(name);                         data.setAccount_type(type);                         data.setSystem_contact_id(systemContactId);                         accountMapList.add(data);                         cursorAccount.moveToNext();                   }             }             cursorAccount.close();       }       private void readAccountNames() {             AccountManager am = AccountManager.get(context);             Account[] accounts = am.getAccounts();             for(Account acc : accounts){                   ContactData data = new ContactData();                   data.setAccount_name(acc.name);                   data.setAccount_type(acc.type);                   accountList.add(data);             }       }             private void readFavouriteContacts() {             Uri URI_STARRED = ContactsContract.Contacts.CONTENT_URI;             String[] PROJECTION_STARRED = new String[]{ContactsContract.Contacts._ID};             String SELECTION_STARRED = ContactsContract.Contacts.STARRED + " = ?";             String[] SELECTION_ARRAY_STARRED = new String[]{"1"};             Cursor cursorStarred = cr.query(URI_STARRED, PROJECTION_STARRED, SELECTION_STARRED, SELECTION_ARRAY_STARRED, null);             if(cursorStarred.getCount() > 0){                   cursorStarred.moveToFirst();                   int indexContactId = cursorStarred.getColumnIndex(ContactsContract.Contacts._ID);                   while(!cursorStarred.isAfterLast()){                         ContactData data = new ContactData();                         int id = cursorStarred.getInt(indexContactId);                         data.setSystem_contact_id(id);                         favouriteList.add(data);                         Log.v(LOG_CLASS, LOG_CLASS +"Favourite Contact ID:- " + id);                         cursorStarred.moveToNext();                   }             }             cursorStarred.close();       }             private void getImageOfContact(int id){              Uri URI_PHOTO = ContactsContract.Data.CONTENT_URI;          String SELECTION_PHOTO = ContactsContract.Data.CONTACT_ID                                      + " = ? AND " + ContactsContract.Data.MIMETYPE                                      + " = ?";          String[] SELECTION_ARRAY_PHOTO = new String[] {                                      String.valueOf(id),                                      ContactsContract.CommonDataKinds.Photo.CONTENT_ITEM_TYPE };          Cursor currPhoto = cr.query(URI_PHOTO, null,SELECTION_PHOTO, SELECTION_ARRAY_PHOTO, null);          int indexPhoto = currPhoto.getColumnIndex(ContactsContract.CommonDataKinds.Photo.PHOTO);          if(currPhoto.getCount() > 0){              currPhoto.moveToFirst();              byte[] photoByte = currPhoto.getBlob(indexPhoto);              if (photoByte != null) {                  ContactData data = new ContactData();                    Bitmap bitmap = BitmapFactory.decodeByteArray(photoByte, 0, photoByte.length);                  data.setImage(bitmap);                  data.setSystem_contact_id(id);                  imageList.add(data);              }          }          currPhoto.close();       } }

Now you can call it like this way  
PhoneContact pc = new PhoneContact(getApplicationContext());
and see the logcat it will show all the details.

Accessing, processing, and writing out the Contacts entries can take 5-10 seconds for a typical phone with several hundred entries. If this were run on the main UI thread it would lock up the UI for that period. Thus, call it in background thread.