add isScheduled call: checks whether a period task is scheduled (andr…

…oid only) (#535)

Co-authored-by: Sebastian Roth <sebastian.roth@gmail.com>

android/src/main/kotlin/dev/fluttercommunity/workmanager/Extractor.kt

@@ -13,6 +13,7 @@ import androidx.work.PeriodicWorkRequest
 import androidx.work.WorkRequest
 import dev.fluttercommunity.workmanager.WorkManagerCall.CancelTask.ByTag.KEYS.UNREGISTER_TASK_TAG_KEY
 import dev.fluttercommunity.workmanager.WorkManagerCall.CancelTask.ByUniqueName.KEYS.UNREGISTER_TASK_UNIQUE_NAME_KEY
+import dev.fluttercommunity.workmanager.WorkManagerCall.IsScheduled.ByUniqueName.KEYS.IS_SCHEDULED_UNIQUE_NAME_KEY
 import dev.fluttercommunity.workmanager.WorkManagerCall.Initialize.KEYS.INITIALIZE_TASK_CALL_HANDLE_KEY
 import dev.fluttercommunity.workmanager.WorkManagerCall.Initialize.KEYS.INITIALIZE_TASK_IS_IN_DEBUG_MODE_KEY
 import dev.fluttercommunity.workmanager.WorkManagerCall.RegisterTask.KEYS.REGISTER_TASK_BACK_OFF_POLICY_DELAY_MILLIS_KEY
@@ -131,6 +132,14 @@ sealed class WorkManagerCall {
         }
     }
 
+    sealed class IsScheduled : WorkManagerCall() {
+        data class ByUniqueName(val uniqueName: String) : IsScheduled() {
+            companion object KEYS {
+                const val IS_SCHEDULED_UNIQUE_NAME_KEY = "uniqueName"
+            }
+        }
+    }
+
     sealed class CancelTask : WorkManagerCall() {
         data class ByUniqueName(val uniqueName: String) : CancelTask() {
             companion object KEYS {
@@ -164,6 +173,8 @@ object Extractor {
         REGISTER_ONE_OFF_TASK("registerOneOffTask"),
         REGISTER_PERIODIC_TASK("registerPeriodicTask"),
 
+        IS_SCHEDULED_BY_UNIQUE_NAME("isScheduledByUniqueName"),
+
         CANCEL_TASK_BY_UNIQUE_NAME("cancelTaskByUniqueName"),
         CANCEL_TASK_BY_TAG("cancelTaskByTag"),
         CANCEL_ALL("cancelAllTasks"),
@@ -228,6 +239,12 @@ object Extractor {
                 )
             }
 
+            PossibleWorkManagerCall.IS_SCHEDULED_BY_UNIQUE_NAME -> {
+                WorkManagerCall.IsScheduled.ByUniqueName(
+                    call.argument(IS_SCHEDULED_UNIQUE_NAME_KEY)!!
+                )
+            }
+
             PossibleWorkManagerCall.CANCEL_TASK_BY_UNIQUE_NAME -> WorkManagerCall.CancelTask.ByUniqueName(
                 call.argument(UNREGISTER_TASK_UNIQUE_NAME_KEY)!!
             )

android/src/main/kotlin/dev/fluttercommunity/workmanager/WorkmanagerCallHandler.kt

@@ -8,6 +8,7 @@ import androidx.work.ExistingWorkPolicy
 import androidx.work.OneTimeWorkRequest
 import androidx.work.OutOfQuotaPolicy
 import androidx.work.PeriodicWorkRequest
+import androidx.work.WorkInfo
 import androidx.work.WorkManager
 import dev.fluttercommunity.workmanager.BackgroundWorker.Companion.DART_TASK_KEY
 import dev.fluttercommunity.workmanager.BackgroundWorker.Companion.IS_IN_DEBUG_MODE_KEY
@@ -36,6 +37,11 @@ class WorkmanagerCallHandler(private val ctx: Context) : MethodChannel.MethodCal
                 extractedCall,
                 result
             )
+            is WorkManagerCall.IsScheduled -> IsScheduledHandler.handle(
+                ctx,
+                extractedCall,
+                result
+            )
             is WorkManagerCall.CancelTask -> UnregisterTaskHandler.handle(
                 ctx,
                 extractedCall,
@@ -140,6 +146,23 @@ private object RegisterTaskHandler : CallHandler<WorkManagerCall.RegisterTask> {
     }
 }
 
+private object IsScheduledHandler : CallHandler<WorkManagerCall.IsScheduled> {
+    override fun handle(
+        context: Context,
+        convertedCall: WorkManagerCall.IsScheduled,
+        result: MethodChannel.Result
+    ) {
+        when (convertedCall) {
+            is WorkManagerCall.IsScheduled.ByUniqueName -> {
+                val workInfos = WM.getWorkInfoByUniqueName(context, convertedCall.uniqueName).get()
+                val scheduled = workInfos.isNotEmpty()
+                        && workInfos.all { it.state == WorkInfo.State.ENQUEUED || it.state == WorkInfo.State.RUNNING }
+                return result.success(scheduled)
+            }
+        }
+    }
+}
+
 private object UnregisterTaskHandler : CallHandler<WorkManagerCall.CancelTask> {
     override fun handle(
         context: Context,
@@ -274,6 +297,9 @@ object WM {
             .build()
     }
 
+    fun getWorkInfoByUniqueName(context: Context, uniqueWorkName: String) =
+        context.workManager().getWorkInfosForUniqueWork(uniqueWorkName)
+
     fun cancelByUniqueName(context: Context, uniqueWorkName: String) =
         context.workManager().cancelUniqueWork(uniqueWorkName)
 

example/lib/main.dart

@@ -141,7 +141,11 @@ class _MyAppState extends State<MyApp> {
                     }
                   },
                 ),
-                SizedBox(height: 16),
+                SizedBox(height: 8),
+                Text(
+                  "Register task",
+                  style: Theme.of(context).textTheme.headlineSmall,
+                ),
 
                 //This task runs once.
                 //Most likely this will trigger immediately
@@ -194,6 +198,10 @@ class _MyAppState extends State<MyApp> {
                       );
                     }),
                 SizedBox(height: 8),
+                Text(
+                  "Register periodic task (android only)",
+                  style: Theme.of(context).textTheme.headlineSmall,
+                ),
                 //This task runs periodically
                 //It will wait at least 10 seconds before its first launch
                 //Since we have not provided a frequency it will be the default 15 minutes
@@ -265,6 +273,17 @@ class _MyAppState extends State<MyApp> {
                       : null,
                 ),
                 SizedBox(height: 16),
+                ElevatedButton(
+                    child: Text("isscheduled (Android)"),
+                    onPressed: Platform.isAndroid
+                        ? () async {
+                            final workInfo = await Workmanager().isScheduledByUniqueName(
+                              simplePeriodicTask,
+                            );
+                            print('isscheduled = $workInfo');
+                          }
+                        : null),
+                SizedBox(height: 8),
                 Text(
                   "Task cancellation",
                   style: Theme.of(context).textTheme.headlineSmall,

lib/src/workmanager.dart

@@ -275,6 +275,17 @@ class Workmanager {
         ),
       );
 
+  /// Checks whether a period task is scheduled by its [uniqueName].
+  ///
+  /// Scheduled means the work state is either ENQUEUED or RUNNING
+  /// 
+  /// Only available on Android.
+  Future<bool> isScheduledByUniqueName(final String uniqueName) async {
+   return await _foregroundChannel.invokeMethod(
+      "isScheduledByUniqueName",
+      {"uniqueName": uniqueName},
+    );
+
   /// Schedule a background long running task, currently only available on iOS.
   ///
   /// Processing tasks are for long processes like data processing and app maintenance.