check whether app is in foreground before starting service

android/app/src/main/kotlin/deckers/thibault/aves/channel/calls/AnalysisHandler.kt

@@ -1,5 +1,6 @@
 package deckers.thibault.aves.channel.calls
 
+import android.app.ActivityManager
 import android.content.Context
 import androidx.work.ExistingWorkPolicy
 import androidx.work.OneTimeWorkRequestBuilder
@@ -51,6 +52,17 @@ class AnalysisHandler(private val activity: FlutterFragmentActivity, private val
             return
         }
 
+        val activityManager: ActivityManager = activity.getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager
+        val runningAppProcesses = activityManager.runningAppProcesses
+        if (runningAppProcesses != null) {
+            val importance = runningAppProcesses[0].importance
+            if (importance < ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
+                // the app is in the background
+                result.error("startAnalysis-background", "app is in the background (process importance=$importance)", null)
+                return
+            }
+        }
+
         // can be null or empty
         val allEntryIds = call.argument<List<Int>>("entryIds")
 

lib/model/source/collection_source.dart

@@ -495,7 +495,6 @@ abstract class CollectionSource with SourceBase, AlbumMixin, CountryMixin, Place
           }
         }
       }
-      // TODO TLAD check whether app is in foreground before starting service
       if (startAnalysisService) {
         await AnalysisService.startService(
           force: force,