Catalog metadata: check xmp title/description to set title

android/app/src/main/java/deckers/thibault/aves/channelhandlers/MetadataHandler.java

@@ -43,6 +43,10 @@ public class MetadataHandler implements MethodChannel.MethodCallHandler {
 
     private static final String XMP_DC_SCHEMA_NS = "http://purl.org/dc/elements/1.1/";
     private static final String XMP_SUBJECT_PROP_NAME = "dc:subject";
+    private static final String XMP_TITLE_PROP_NAME = "dc:title";
+    private static final String XMP_DESCRIPTION_PROP_NAME = "dc:description";
+    private static final String XMP_GENERIC_LANG = "";
+    private static final String XMP_SPECIFIC_LANG = "en-US";
     private static final Pattern videoLocationPattern = Pattern.compile("([+-][.0-9]+)([+-][.0-9]+)/?");
 
     private Context context;
@@ -207,6 +211,13 @@ public class MetadataHandler implements MethodChannel.MethodCallHandler {
                             }
                             metadataMap.put("xmpSubjects", sb.toString());
                         }
+                        if (xmpMeta.doesPropertyExist(XMP_DC_SCHEMA_NS, XMP_TITLE_PROP_NAME)) {
+                            XMPProperty item = xmpMeta.getLocalizedText(XMP_DC_SCHEMA_NS, XMP_TITLE_PROP_NAME, XMP_GENERIC_LANG, XMP_SPECIFIC_LANG);
+                            metadataMap.put("xmpTitleDescription", item.getValue());
+                        } else if (xmpMeta.doesPropertyExist(XMP_DC_SCHEMA_NS, XMP_DESCRIPTION_PROP_NAME)) {
+                            XMPProperty item = xmpMeta.getLocalizedText(XMP_DC_SCHEMA_NS, XMP_DESCRIPTION_PROP_NAME, XMP_GENERIC_LANG, XMP_SPECIFIC_LANG);
+                            metadataMap.put("xmpTitleDescription", item.getValue());
+                        }
                     } catch (XMPException e) {
                         e.printStackTrace();
                     }

lib/model/image_entry.dart

@@ -21,7 +21,7 @@ class ImageEntry {
   int height;
   int orientationDegrees;
   final int sizeBytes;
-  String title;
+  String sourceTitle;
   final int dateModifiedSecs;
   final int sourceDateTakenMillis;
   final String bucketDisplayName;
@@ -41,7 +41,7 @@ class ImageEntry {
     this.height,
     this.orientationDegrees,
     this.sizeBytes,
-    this.title,
+    this.sourceTitle,
     this.dateModifiedSecs,
     this.sourceDateTakenMillis,
     this.bucketDisplayName,
@@ -60,7 +60,7 @@ class ImageEntry {
       height: map['height'] as int,
       orientationDegrees: map['orientationDegrees'] as int,
       sizeBytes: map['sizeBytes'] as int,
-      title: map['title'] as String,
+      sourceTitle: map['title'] as String,
       dateModifiedSecs: map['dateModifiedSecs'] as int,
       sourceDateTakenMillis: map['sourceDateTakenMillis'] as int,
       bucketDisplayName: map['bucketDisplayName'] as String,
@@ -78,7 +78,7 @@ class ImageEntry {
       'height': height,
       'orientationDegrees': orientationDegrees,
       'sizeBytes': sizeBytes,
-      'title': title,
+      'title': sourceTitle,
       'dateModifiedSecs': dateModifiedSecs,
       'sourceDateTakenMillis': sourceDateTakenMillis,
       'bucketDisplayName': bucketDisplayName,
@@ -157,6 +157,11 @@ class ImageEntry {
 
   List<String> get xmpSubjects => catalogMetadata?.xmpSubjects?.split(';')?.where((tag) => tag.isNotEmpty)?.toList() ?? [];
 
+  String get title {
+    if (catalogMetadata != null && catalogMetadata.xmpTitleDescription.isNotEmpty) return catalogMetadata.xmpTitleDescription;
+    return sourceTitle;
+  }
+
   Future<void> catalog() async {
     if (isCatalogued) return;
     catalogMetadata = await MetadataService.getCatalogMetadata(this);
@@ -223,8 +228,8 @@ class ImageEntry {
     if (path is String) this.path = path;
     final contentId = newFields['contentId'];
     if (contentId is int) this.contentId = contentId;
-    final title = newFields['title'];
+    final sourceTitle = newFields['sourceTitle'];
-    if (title is String) this.title = title;
+    if (sourceTitle is String) this.sourceTitle = sourceTitle;
     metadataChangeNotifier.notifyListeners();
     return true;
   }

lib/model/image_metadata.dart

@@ -3,7 +3,7 @@ import 'package:geocoder/model.dart';
 
 class CatalogMetadata {
   final int contentId, dateMillis, videoRotation;
-  final String xmpSubjects;
+  final String xmpSubjects, xmpTitleDescription;
   final double latitude, longitude;
   Address address;
 
@@ -12,6 +12,7 @@ class CatalogMetadata {
     this.dateMillis,
     this.videoRotation,
     this.xmpSubjects,
+    this.xmpTitleDescription,
     double latitude,
     double longitude,
   })  
@@ -25,6 +26,7 @@ class CatalogMetadata {
       dateMillis: map['dateMillis'] ?? 0,
       videoRotation: map['videoRotation'] ?? 0,
       xmpSubjects: map['xmpSubjects'] ?? '',
+      xmpTitleDescription: map['xmpTitleDescription'] ?? '',
       latitude: map['latitude'],
       longitude: map['longitude'],
     );
@@ -35,13 +37,14 @@ class CatalogMetadata {
         'dateMillis': dateMillis,
         'videoRotation': videoRotation,
         'xmpSubjects': xmpSubjects,
+        'xmpTitleDescription': xmpTitleDescription,
         'latitude': latitude,
         'longitude': longitude,
       };
 
   @override
   String toString() {
-    return 'CatalogMetadata{contentId=$contentId, dateMillis=$dateMillis, videoRotation=$videoRotation, latitude=$latitude, longitude=$longitude, xmpSubjects=$xmpSubjects}';
+    return 'CatalogMetadata{contentId=$contentId, dateMillis=$dateMillis, videoRotation=$videoRotation, latitude=$latitude, longitude=$longitude, xmpSubjects=$xmpSubjects, xmpTitleDescription=$xmpTitleDescription}';
   }
 }
 

lib/model/metadata_db.dart

@@ -23,7 +23,7 @@ class MetadataDb {
     _database = openDatabase(
       await path,
       onCreate: (db, version) async {
-        await db.execute('CREATE TABLE $metadataTable(contentId INTEGER PRIMARY KEY, dateMillis INTEGER, videoRotation INTEGER, xmpSubjects TEXT, latitude REAL, longitude REAL)');
+        await db.execute('CREATE TABLE $metadataTable(contentId INTEGER PRIMARY KEY, dateMillis INTEGER, videoRotation INTEGER, xmpSubjects TEXT, xmpTitleDescription TEXT, latitude REAL, longitude REAL)');
         await db.execute('CREATE TABLE $addressTable(contentId INTEGER PRIMARY KEY, addressLine TEXT, countryName TEXT, adminArea TEXT, locality TEXT)');
         await db.execute('CREATE TABLE $favouriteTable(contentId INTEGER PRIMARY KEY, path TEXT)');
       },

lib/model/metadata_service.dart

@@ -31,7 +31,8 @@ class MetadataService {
       // 'dateMillis': date taken in milliseconds since Epoch (long)
       // 'latitude': latitude (double)
       // 'longitude': longitude (double)
-      // 'xmpSubjects': space separated XMP subjects (string)
+      // 'xmpSubjects': ';' separated XMP subjects (string)
+      // 'xmpTitleDescription': XMP title or XMP description (string)
       final result = await platform.invokeMethod('getCatalogMetadata', <String, dynamic>{
         'mimeType': entry.mimeType,
         'path': entry.path,