Support android's SOURCE_ID field

android/build.gradle

@@ -22,6 +22,7 @@ rootProject.allprojects {
 apply plugin: 'com.android.library'
 
 android {
+    namespace "flutter.plugins.contactsservice.contactsservice"
     compileSdkVersion 30
 
     defaultConfig {

android/src/main/java/flutter/plugins/contactsservice/contactsservice/Contact.java

@@ -13,7 +13,7 @@ private Contact() {
     }
 
     String identifier;
-    String displayName, givenName, middleName, familyName, prefix, suffix, company, jobTitle, note, birthday, androidAccountType, androidAccountName;
+    String displayName, givenName, middleName, familyName, prefix, suffix, company, jobTitle, note, birthday, androidAccountType, androidAccountName, sourceId;
     ArrayList<Item> emails = new ArrayList<>();
     ArrayList<Item> phones = new ArrayList<>();
     ArrayList<PostalAddress> postalAddresses = new ArrayList<>();
@@ -35,6 +35,7 @@ HashMap<String, Object> toMap() {
         contactMap.put("birthday", birthday);
         contactMap.put("androidAccountType", androidAccountType);
         contactMap.put("androidAccountName", androidAccountName);
+        contactMap.put("sourceId", sourceId);
 
         ArrayList<HashMap<String, String>> emailsMap = new ArrayList<>();
         for (Item email : emails) {
@@ -73,6 +74,7 @@ static Contact fromMap(HashMap map) {
         contact.birthday = (String) map.get("birthday");
         contact.androidAccountType = (String) map.get("androidAccountType");
         contact.androidAccountName = (String) map.get("androidAccountName");
+        contact.sourceId = (String) map.get("sourceId");
 
         ArrayList<HashMap> emails = (ArrayList<HashMap>) map.get("emails");
         if (emails != null) {

android/src/main/java/flutter/plugins/contactsservice/contactsservice/ContactsServicePlugin.java

@@ -177,6 +177,7 @@ public void onMethodCall(MethodCall call, Result result) {
                   ContactsContract.Contacts.Data.MIMETYPE,
                   ContactsContract.RawContacts.ACCOUNT_TYPE,
                   ContactsContract.RawContacts.ACCOUNT_NAME,
+                  ContactsContract.RawContacts.SOURCE_ID,
                   StructuredName.DISPLAY_NAME,
                   StructuredName.GIVEN_NAME,
                   StructuredName.MIDDLE_NAME,
@@ -271,6 +272,10 @@ void finishWithResult(Object result) {
 
     @Override
     public boolean onActivityResult(int requestCode, int resultCode, Intent intent) {
+      if (intent == null) {
+        return true;
+      }
+
       if(requestCode == REQUEST_OPEN_EXISTING_CONTACT || requestCode == REQUEST_OPEN_CONTACT_FORM) {
         try {
           Uri ur = intent.getData();
@@ -286,16 +291,16 @@ public boolean onActivityResult(int requestCode, int resultCode, Intent intent)
           finishWithResult(FORM_OPERATION_CANCELED);
           return true;
         }
+
         Uri contactUri = intent.getData();
-          if (intent != null){
         Cursor cursor = contentResolver.query(contactUri, null, null, null, null);
         if (cursor.moveToFirst()) {
           String id = contactUri.getLastPathSegment();
           getContacts("openDeviceContactPicker", id, false, false, false, localizedLabels, this.result);
         } else {
           Log.e(LOG_TAG, "onActivityResult - cursor.moveToFirst() returns false");
           finishWithResult(FORM_OPERATION_CANCELED);
-        }}else{return true;}
+        }
         cursor.close();
         return true;
       }
@@ -575,6 +580,7 @@ private ArrayList<Contact> getContactsFrom(Cursor cursor, boolean localizedLabel
       contact.displayName = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
       contact.androidAccountType = cursor.getString(cursor.getColumnIndex(ContactsContract.RawContacts.ACCOUNT_TYPE));
       contact.androidAccountName = cursor.getString(cursor.getColumnIndex(ContactsContract.RawContacts.ACCOUNT_NAME));
+      contact.sourceId = cursor.getString(cursor.getColumnIndex(ContactsContract.RawContacts.SOURCE_ID));
 
       //NAMES
       if (mimeType.equals(CommonDataKinds.StructuredName.CONTENT_ITEM_TYPE)) {

example/android/app/build.gradle

@@ -47,4 +47,4 @@ flutter {
 dependencies {
     androidTestImplementation 'androidx.test:runner:1.1.0'
     androidTestImplementation 'androidx.test:rules:1.1.0'
-}
+}

lib/contacts_service.dart

@@ -196,6 +196,7 @@ class Contact {
     this.androidAccountType,
     this.androidAccountTypeRaw,
     this.androidAccountName,
+    this.sourceId,
   });
 
   String? identifier,
@@ -207,7 +208,7 @@ class Contact {
       familyName,
       company,
       jobTitle;
-  String? androidAccountTypeRaw, androidAccountName;
+  String? androidAccountTypeRaw, androidAccountName, sourceId;
   AndroidAccountType? androidAccountType;
   List<Item>? emails = [];
   List<Item>? phones = [];
@@ -234,6 +235,7 @@ class Contact {
     androidAccountTypeRaw = m["androidAccountType"];
     androidAccountType = accountTypeFromString(androidAccountTypeRaw);
     androidAccountName = m["androidAccountName"];
+    sourceId = m["sourceId"];
     emails = (m["emails"] as List?)?.map((m) => Item.fromMap(m)).toList();
     phones = (m["phones"] as List?)?.map((m) => Item.fromMap(m)).toList();
     postalAddresses = (m["postalAddresses"] as List?)
@@ -300,6 +302,7 @@ class Contact {
         jobTitle: this.jobTitle ?? other.jobTitle,
         androidAccountType: this.androidAccountType ?? other.androidAccountType,
         androidAccountName: this.androidAccountName ?? other.androidAccountName,
+        sourceId: this.sourceId ?? other.sourceId,
         emails: this.emails == null
             ? other.emails
             : this
@@ -338,6 +341,7 @@ class Contact {
         this.jobTitle == other.jobTitle &&
         this.androidAccountType == other.androidAccountType &&
         this.androidAccountName == other.androidAccountName &&
+        this.sourceId == other.sourceId &&
         this.middleName == other.middleName &&
         this.prefix == other.prefix &&
         this.suffix == other.suffix &&
@@ -359,6 +363,7 @@ class Contact {
       this.jobTitle,
       this.androidAccountType,
       this.androidAccountName,
+      this.sourceId,
       this.middleName,
       this.prefix,
       this.suffix,

test/contacts_test.dart

@@ -226,6 +226,7 @@ void main() {
       "jobTitle": null,
       "androidAccountType": null,
       "androidAccountName": null,
+      "sourceId": null,
       "emails": [],
       "phones": [],
       "postalAddresses": [],