Add:Android sleep timer setting to disable audio fade out #320

android/app/src/main/java/com/audiobookshelf/app/data/DeviceClasses.kt

@@ -102,7 +102,8 @@ data class DeviceSettings(
   var autoSleepTimer: Boolean,
   var autoSleepTimerStartTime: String,
   var autoSleepTimerEndTime: String,
-  var sleepTimerLength: Long // Time in milliseconds
+  var sleepTimerLength: Long, // Time in milliseconds
+  var disableSleepTimerFadeOut: Boolean
 ) {
   companion object {
     // Static method to get default device settings
@@ -119,7 +120,8 @@ data class DeviceSettings(
         autoSleepTimer = false,
         autoSleepTimerStartTime = "22:00",
         autoSleepTimerEndTime = "06:00",
-        sleepTimerLength = 900000L // 15 minutes
+        sleepTimerLength = 900000L, // 15 minutes
+        disableSleepTimerFadeOut = false
       )
     }
   }

android/app/src/main/java/com/audiobookshelf/app/managers/SleepTimerManager.kt

@@ -108,10 +108,16 @@ class SleepTimerManager constructor(private val playerNotificationService: Playe
             clearSleepTimer()
             sleepTimerFinishedAt = System.currentTimeMillis()
           } else if (sleepTimeSecondsRemaining <= 60) {
-            // Start fading out audio
-            val volume = sleepTimeSecondsRemaining / 60F
-            Log.d(tag, "SLEEP VOLUME FADE $volume | ${sleepTimeSecondsRemaining}s remaining")
-            setVolume(volume)
+            if (DeviceManager.deviceData.deviceSettings?.disableSleepTimerFadeOut == true) {
+              // Set volume to 1 in case setting was enabled while fading
+              setVolume(1f)
+            } else {
+              // Start fading out audio down to 10% volume
+              val percentToReduce = 1 - (sleepTimeSecondsRemaining / 60F)
+              val volume =  1f - (percentToReduce * 0.9f)
+              Log.d(tag, "SLEEP VOLUME FADE $volume | ${sleepTimeSecondsRemaining}s remaining")
+              setVolume(volume)
+            }
           }
         }
       }