Merge pull request cph-cachet#394 from Crewlan/bugfix/android

added functions to request authorization

packages/health/lib/src/health_factory.dart

@@ -6,14 +6,33 @@ class HealthFactory {
   String? _deviceId;
   final _deviceInfo = DeviceInfoPlugin();
 
-  static PlatformType _platformType =
-      Platform.isAndroid ? PlatformType.ANDROID : PlatformType.IOS;
+  static PlatformType _platformType = Platform.isAndroid ? PlatformType.ANDROID : PlatformType.IOS;
 
   /// Check if a given data type is available on the platform
-  bool isDataTypeAvailable(HealthDataType dataType) =>
-      _platformType == PlatformType.ANDROID
-          ? _dataTypeKeysAndroid.contains(dataType)
-          : _dataTypeKeysIOS.contains(dataType);
+  bool isDataTypeAvailable(HealthDataType dataType) => _platformType == PlatformType.ANDROID
+      ? _dataTypeKeysAndroid.contains(dataType)
+      : _dataTypeKeysIOS.contains(dataType);
+
+  /// iOS isn't completely supported by HealthKit, false means no, true means user has approved or declined permissions.
+  /// In case user has declined permissions read will just return empty list for declined data types.
+  static Future<bool?> hasPermissions(List<HealthDataType> types) async {
+    return await _channel.invokeMethod('hasPermissions', {
+      "types": types.map((type) => _enumToString(type)).toList(),
+    });
+  }
+
+  /// If you're using more than one DataType it's advised to call requestPermissions with all the data types once,
+  /// otherwise iOS HealthKit will ask to approve every permission one by one in separate screens.
+  static Future<bool?> requestPermissions(List<HealthDataType> types) async {
+    return await _channel.invokeMethod('requestPermissions', {
+      "types": types.map((type) => _enumToString(type)).toList(),
+    });
+  }
+
+  /// iOS isn't supported by HealthKit, method does nothing.
+  static Future<void> revokePermissions() async {
+    return await _channel.invokeMethod('revokePermissions');
+  }
 
   /// Request access to GoogleFit or Apple HealthKit
   Future<bool> requestAuthorization(List<HealthDataType> types) async {
@@ -29,23 +48,19 @@ class HealthFactory {
     }
 
     List<String> keys = types.map((e) => _enumToString(e)).toList();
-    final bool isAuthorized =
-        await _channel.invokeMethod('requestAuthorization', {'types': keys});
+    final bool isAuthorized = await _channel.invokeMethod('requestAuthorization', {'types': keys});
     return isAuthorized;
   }
 
   /// Calculate the BMI using the last observed height and weight values.
-  Future<List<HealthDataPoint>> _computeAndroidBMI(
-      DateTime startDate, DateTime endDate) async {
-    List<HealthDataPoint> heights =
-        await _prepareQuery(startDate, endDate, HealthDataType.HEIGHT);
+  Future<List<HealthDataPoint>> _computeAndroidBMI(DateTime startDate, DateTime endDate) async {
+    List<HealthDataPoint> heights = await _prepareQuery(startDate, endDate, HealthDataType.HEIGHT);
 
     if (heights.isEmpty) {
       return [];
     }
 
-    List<HealthDataPoint> weights =
-        await _prepareQuery(startDate, endDate, HealthDataType.WEIGHT);
+    List<HealthDataPoint> weights = await _prepareQuery(startDate, endDate, HealthDataType.WEIGHT);
 
     double h = heights.last.value.toDouble();
 
@@ -55,8 +70,8 @@ class HealthFactory {
     final bmiHealthPoints = <HealthDataPoint>[];
     for (var i = 0; i < weights.length; i++) {
       final bmiValue = weights[i].value.toDouble() / (h * h);
-      final x = HealthDataPoint(bmiValue, dataType, unit, weights[i].dateFrom,
-          weights[i].dateTo, _platformType, _deviceId!, '', '');
+      final x = HealthDataPoint(
+          bmiValue, dataType, unit, weights[i].dateFrom, weights[i].dateTo, _platformType, _deviceId!, '', '');
 
       bmiHealthPoints.add(x);
     }
@@ -76,30 +91,26 @@ class HealthFactory {
   }
 
   /// Prepares a query, i.e. checks if the types are available, etc.
-  Future<List<HealthDataPoint>> _prepareQuery(
-      DateTime startDate, DateTime endDate, HealthDataType dataType) async {
+  Future<List<HealthDataPoint>> _prepareQuery(DateTime startDate, DateTime endDate, HealthDataType dataType) async {
     // Ask for device ID only once
     _deviceId ??= _platformType == PlatformType.ANDROID
         ? (await _deviceInfo.androidInfo).androidId
         : (await _deviceInfo.iosInfo).identifierForVendor;
 
     // If not implemented on platform, throw an exception
     if (!isDataTypeAvailable(dataType)) {
-      throw _HealthException(
-          dataType, 'Not available on platform $_platformType');
+      throw _HealthException(dataType, 'Not available on platform $_platformType');
     }
 
     // If BodyMassIndex is requested on Android, calculate this manually
-    if (dataType == HealthDataType.BODY_MASS_INDEX &&
-        _platformType == PlatformType.ANDROID) {
+    if (dataType == HealthDataType.BODY_MASS_INDEX && _platformType == PlatformType.ANDROID) {
       return _computeAndroidBMI(startDate, endDate);
     }
     return await _dataQuery(startDate, endDate, dataType);
   }
 
   /// The main function for fetching health data
-  Future<List<HealthDataPoint>> _dataQuery(
-      DateTime startDate, DateTime endDate, HealthDataType dataType) async {
+  Future<List<HealthDataPoint>> _dataQuery(DateTime startDate, DateTime endDate, HealthDataType dataType) async {
     // Set parameters for method channel request
     final args = <String, dynamic>{
       'dataTypeKey': _enumToString(dataType),
@@ -113,8 +124,7 @@ class HealthFactory {
     if (fetchedDataPoints != null) {
       return fetchedDataPoints.map<HealthDataPoint>((e) {
         final num value = e['value'];
-        final DateTime from =
-            DateTime.fromMillisecondsSinceEpoch(e['date_from']);
+        final DateTime from = DateTime.fromMillisecondsSinceEpoch(e['date_from']);
         final DateTime to = DateTime.fromMillisecondsSinceEpoch(e['date_to']);
         final String sourceId = e["source_id"];
         final String sourceName = e["source_name"];