add mimeType attribute in Medium

android/src/main/kotlin/com/morbit/photogallery/PhotoGalleryPlugin.kt

@@ -56,6 +56,7 @@ class PhotoGalleryPlugin : FlutterPlugin, MethodCallHandler {
             MediaStore.Images.Media._ID,
             MediaStore.Images.Media.WIDTH,
             MediaStore.Images.Media.HEIGHT,
+            MediaStore.Images.Media.MIME_TYPE,
             MediaStore.Images.Media.DATE_TAKEN,
             MediaStore.Images.Media.DATE_MODIFIED
         )
@@ -64,6 +65,7 @@ class PhotoGalleryPlugin : FlutterPlugin, MethodCallHandler {
             MediaStore.Video.Media._ID,
             MediaStore.Video.Media.WIDTH,
             MediaStore.Video.Media.HEIGHT,
+            MediaStore.Video.Media.MIME_TYPE,
             MediaStore.Video.Media.DURATION,
             MediaStore.Video.Media.DATE_TAKEN,
             MediaStore.Video.Media.DATE_MODIFIED
@@ -587,12 +589,14 @@ class PhotoGalleryPlugin : FlutterPlugin, MethodCallHandler {
         val idColumn = cursor.getColumnIndex(MediaStore.Images.Media._ID)
         val widthColumn = cursor.getColumnIndex(MediaStore.Images.Media.WIDTH)
         val heightColumn = cursor.getColumnIndex(MediaStore.Images.Media.HEIGHT)
+        val mimeColumn = cursor.getColumnIndex(MediaStore.Images.Media.MIME_TYPE)
         val dateTakenColumn = cursor.getColumnIndex(MediaStore.Images.Media.DATE_TAKEN)
         val dateModifiedColumn = cursor.getColumnIndex(MediaStore.Images.Media.DATE_MODIFIED)
 
         val id = cursor.getLong(idColumn)
         val width = cursor.getLong(widthColumn)
         val height = cursor.getLong(heightColumn)
+        val mimeType = cursor.getString(mimeColumn)
         var dateTaken: Long? = null
         if (cursor.getType(dateTakenColumn) == FIELD_TYPE_INTEGER) {
             dateTaken = cursor.getLong(dateTakenColumn)
@@ -607,6 +611,7 @@ class PhotoGalleryPlugin : FlutterPlugin, MethodCallHandler {
             "mediumType" to imageType,
             "width" to width,
             "height" to height,
+            "mimeType" to mimeType,
             "creationDate" to dateTaken,
             "modifiedDate" to dateModified
         )
@@ -616,6 +621,7 @@ class PhotoGalleryPlugin : FlutterPlugin, MethodCallHandler {
         val idColumn = cursor.getColumnIndex(MediaStore.Video.Media._ID)
         val widthColumn = cursor.getColumnIndex(MediaStore.Video.Media.WIDTH)
         val heightColumn = cursor.getColumnIndex(MediaStore.Video.Media.HEIGHT)
+        val mimeColumn = cursor.getColumnIndex(MediaStore.Video.Media.MIME_TYPE)
         val durationColumn = cursor.getColumnIndex(MediaStore.Video.Media.DURATION)
         val dateTakenColumn = cursor.getColumnIndex(MediaStore.Video.Media.DATE_TAKEN)
         val dateModifiedColumn = cursor.getColumnIndex(MediaStore.Video.Media.DATE_MODIFIED)
@@ -623,6 +629,7 @@ class PhotoGalleryPlugin : FlutterPlugin, MethodCallHandler {
         val id = cursor.getLong(idColumn)
         val width = cursor.getLong(widthColumn)
         val height = cursor.getLong(heightColumn)
+        val mimeType = cursor.getString(mimeColumn)
         val duration = cursor.getLong(durationColumn)
         var dateTaken: Long? = null
         if (cursor.getType(dateTakenColumn) == FIELD_TYPE_INTEGER) {
@@ -638,6 +645,7 @@ class PhotoGalleryPlugin : FlutterPlugin, MethodCallHandler {
             "mediumType" to videoType,
             "width" to width,
             "height" to height,
+            "mimeType" to mimeType,
             "duration" to duration,
             "creationDate" to dateTaken,
             "modifiedDate" to dateModified

ios/Classes/SwiftPhotoGalleryPlugin.swift

@@ -376,9 +376,11 @@ public class SwiftPhotoGalleryPlugin: NSObject, FlutterPlugin {
   }
   
   private func getMediumFromAsset(asset: PHAsset) -> [String: Any?] {
+    let mimeType = self.extractMimeTypeFromAsset(asset: asset)
     return [
       "id": asset.localIdentifier,
       "mediumType": toDartMediumType(value: asset.mediaType),
+      "mimeType": mimeType,
       "height": asset.pixelHeight,
       "width": asset.pixelWidth,
       "duration": NSInteger(asset.duration * 1000),
@@ -435,6 +437,16 @@ public class SwiftPhotoGalleryPlugin: NSObject, FlutterPlugin {
     return "." + ext
   }
   
+  private func extractMimeTypeFromUTI(uti: String?) -> String? {
+    guard let assetUTI = uti else {
+      return nil
+    }
+    guard let mimeType = UTTypeCopyPreferredTagWithClass(assetUTI as CFString, kUTTagClassMIMEType as CFString)?.takeRetainedValue() as String? else {
+      return nil
+    }
+    return mimeType
+  }
+  
   private func extractUTIFromAsset(asset: PHAsset) -> String? {
     if #available(iOS 9, *) {
       let resourceList = PHAssetResource.assetResources(for: asset)
@@ -450,6 +462,11 @@ public class SwiftPhotoGalleryPlugin: NSObject, FlutterPlugin {
     return self.extractFileExtensionFromUTI(uti: uti)
   }
   
+  private func extractMimeTypeFromAsset(asset: PHAsset) -> String? {
+    let uti = self.extractUTIFromAsset(asset: asset)
+    return self.extractMimeTypeFromUTI(uti: uti)
+  }
+  
   private func cachePath() -> URL {
     let paths = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask)
     let cacheFolder = paths[0].appendingPathComponent("photo_gallery")

lib/src/models/medium.dart

@@ -17,6 +17,9 @@ class Medium {
   /// The medium height.
   final int height;
 
+  /// The medium mimeType.
+  final String mimeType;
+
   /// The duration of video
   final int duration;
 
@@ -31,6 +34,7 @@ class Medium {
     this.mediumType,
     this.width,
     this.height,
+    this.mimeType,
     this.duration,
     this.creationDate,
     this.modifiedDate,
@@ -42,6 +46,7 @@ class Medium {
         mediumType = jsonToMediumType(json["mediumType"]),
         width = json["width"],
         height = json["height"],
+        mimeType = json["mimeType"],
         duration = json['duration'] ?? 0,
         creationDate = json['creationDate'] != null
             ? DateTime.fromMillisecondsSinceEpoch(json['creationDate'])
@@ -56,6 +61,7 @@ class Medium {
       mediumType: jsonToMediumType(map['mediumType']),
       width: map['width'],
       height: map['height'],
+      mimeType: map["mimeType"],
       creationDate: map['creationDate'],
       modifiedDate: map['modifiedDate'],
     );
@@ -66,6 +72,7 @@ class Medium {
       "id": this.id,
       "mediumType": mediumTypeToJson(this.mediumType),
       "height": this.height,
+      "mimeType": this.mimeType,
       "width": this.width,
       "creationDate": this.creationDate,
       "modifiedDate": this.modifiedDate,
@@ -104,6 +111,7 @@ class Medium {
           mediumType == other.mediumType &&
           width == other.width &&
           height == other.height &&
+          mimeType == other.mimeType &&
           creationDate == other.creationDate &&
           modifiedDate == other.modifiedDate;
 
@@ -113,6 +121,7 @@ class Medium {
       mediumType.hashCode ^
       width.hashCode ^
       height.hashCode ^
+      mimeType.hashCode ^
       creationDate.hashCode ^
       modifiedDate.hashCode;
 
@@ -122,6 +131,7 @@ class Medium {
         'mediumType: $mediumType, '
         'width: $width, '
         'height: $height, '
+        'mimeType: $mimeType, '
         'creationDate: $creationDate, '
         'modifiedDate: $modifiedDate}';
   }