Schedule job if necessary only

src/main/kotlin/nya/kitsunyan/foxydroid/MainApplication.kt

@@ -56,7 +56,7 @@ class MainApplication: Application() {
     }
 
     Cache.cleanup(this)
-    updateSyncJob()
+    updateSyncJob(false)
   }
 
   private fun listenApplications() {
@@ -102,7 +102,7 @@ class MainApplication: Application() {
         val autoSync = Preferences[Preferences.Key.AutoSync]
         if (lastAutoSync != autoSync) {
           lastAutoSync = autoSync
-          updateSyncJob()
+          updateSyncJob(true)
         }
       } else if (it == Preferences.Key.UpdateUnstable) {
         val updateUnstable = Preferences[Preferences.Key.UpdateUnstable]
@@ -114,9 +114,11 @@ class MainApplication: Application() {
     }
   }
 
-  private fun updateSyncJob() {
-    val autoSync = Preferences[Preferences.Key.AutoSync]
+  private fun updateSyncJob(force: Boolean) {
     val jobScheduler = getSystemService(JOB_SCHEDULER_SERVICE) as JobScheduler
+    val reschedule = force || !jobScheduler.allPendingJobs.any { it.id == Common.JOB_ID_SYNC }
+    if (reschedule) {
+      val autoSync = Preferences[Preferences.Key.AutoSync]
       when (autoSync) {
         Preferences.AutoSync.Never -> {
           jobScheduler.cancel(Common.JOB_ID_SYNC)
@@ -143,6 +145,7 @@ class MainApplication: Application() {
         }
       }::class.java
     }
+  }
 
   private fun updateProxy() {
     val type = Preferences[Preferences.Key.ProxyType].proxyType