Availability improvements

From this commit: cph-cachet#799

packages/health/android/src/main/kotlin/cachet/plugins/health/HealthPlugin.kt

@@ -1393,6 +1393,8 @@ class HealthPlugin(private var channel: MethodChannel? = null) :
     override fun onMethodCall(call: MethodCall, result: Result) {
         when (call.method) {
             "useHealthConnectIfAvailable" -> useHealthConnectIfAvailable(call, result)
+            "openSystemSettings" -> openSystemSettings(call, result)
+            "checkAvailability" -> checkAvailability(call, result)
             "hasPermissions" -> hasPermissions(call, result)
             "requestAuthorization" -> requestAuthorization(call, result)
             "revokePermissions" -> revokePermissions(call, result)
@@ -1436,9 +1438,22 @@ class HealthPlugin(private var channel: MethodChannel? = null) :
     var healthConnectAvailable = false
     var healthConnectStatus = HealthConnectClient.SDK_UNAVAILABLE
 
-    fun checkAvailability() {
+    fun checkAvailability(call: MethodCall? = null, result: Result? = null) {
         healthConnectStatus = HealthConnectClient.getSdkStatus(context!!)
         healthConnectAvailable = healthConnectStatus == HealthConnectClient.SDK_AVAILABLE
+        result?.success(healthConnectAvailable)
+    }
+
+    fun openSystemSettings(call: MethodCall, result: Result) {
+        try {
+            val intent = Intent()
+            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+            intent.action = HealthConnectClient.ACTION_HEALTH_CONNECT_SETTINGS
+            context?.startActivity(intent)
+            result.success(true)
+        } catch (e: Throwable) {
+            result.error("UNABLE_TO_START_ACTIVITY", e.message, e)
+        }
     }
 
     fun useHealthConnectIfAvailable(call: MethodCall, result: Result) {

packages/health/ios/Classes/SwiftHealthPlugin.swift

@@ -138,6 +138,10 @@ public class SwiftHealthPlugin: NSObject, FlutterPlugin {
     else if call.method.elementsEqual("requestAuthorization") {
       try! requestAuthorization(call: call, result: result)
     }
+
+    else if call.method.elementsEqual("openSystemSettings") {
+      openSystemSettings(call: call, result: result)
+    }
 
     /// Handle getData
     else if call.method.elementsEqual("getData") {
@@ -184,6 +188,10 @@ public class SwiftHealthPlugin: NSObject, FlutterPlugin {
   func checkIfHealthDataAvailable(call: FlutterMethodCall, result: @escaping FlutterResult) {
     result(HKHealthStore.isHealthDataAvailable())
   }
+
+  func openSystemSettings(call: FlutterMethodCall, result: @escaping FlutterResult) {
+    UIApplication.shared.open(URL(string: "x-apple-health://")!)
+  }
 
   func hasPermissions(call: FlutterMethodCall, result: @escaping FlutterResult) throws {
     let arguments = call.arguments as? NSDictionary

packages/health/lib/src/health_factory.dart

@@ -94,6 +94,27 @@ class HealthFactory {
       print(e);
     }
   }
+
+  /// Opens native system settings for:
+  /// - Health on iOS 
+  /// - Health Connect on Android
+  /// 
+  /// Throws if the application is not installed on the device.
+  Future<void> openSystemSettings() async {
+    await _channel.invokeMethod('openSystemSettings');
+  }
+
+  /// Checks the availability of Health Connect on Android platform.
+  ///
+  /// Returns a bool indicating whether Health Connect is available.
+  ///
+  /// On other platforms than Android it returns always true.
+  Future<bool> checkAvailability() async {
+    if (!Platform.isAndroid) return true;
+
+    final result = await _channel.invokeMethod<bool>('checkAvailability');
+    return result ?? false;
+  }
 
   /// Requests permissions to access data types in Apple Health or Google Fit.
   ///