Add support for respecting battery saver mode

app/src/main/java/com/chiller3/basicsync/Preferences.kt

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2023-2025 Andrew Gunnerson
+ * SPDX-FileCopyrightText: 2023-2026 Andrew Gunnerson
  * SPDX-License-Identifier: GPL-3.0-only
  */
 
@@ -19,6 +19,7 @@ class Preferences(context: Context) {
         // Main preferences.
         const val PREF_REQUIRE_UNMETERED_NETWORK = "require_unmetered_network"
         const val PREF_REQUIRE_SUFFICIENT_BATTERY = "require_sufficient_battery"
+        const val PREF_RESPECT_BATTERY_SAVER = "respect_battery_saver"
         const val PREF_KEEP_ALIVE = "keep_alive"
 
         // Main UI actions only.
@@ -58,6 +59,10 @@ class Preferences(context: Context) {
         get() = prefs.getBoolean(PREF_REQUIRE_SUFFICIENT_BATTERY, true)
         set(enabled) = prefs.edit { putBoolean(PREF_REQUIRE_SUFFICIENT_BATTERY, enabled) }
 
+    var respectBatterySaver: Boolean
+        get() = prefs.getBoolean(PREF_RESPECT_BATTERY_SAVER, true)
+        set(enabled) = prefs.edit { putBoolean(PREF_RESPECT_BATTERY_SAVER, enabled) }
+
     var keepAlive: Boolean
         get() = prefs.getBoolean(PREF_KEEP_ALIVE, true)
         set(enabled) = prefs.edit { putBoolean(PREF_KEEP_ALIVE, enabled) }

app/src/main/java/com/chiller3/basicsync/syncthing/SyncthingService.kt

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2025 Andrew Gunnerson
+ * SPDX-FileCopyrightText: 2025-2026 Andrew Gunnerson
  * SPDX-License-Identifier: GPL-3.0-only
  */
 
@@ -22,6 +22,7 @@ import android.os.BatteryManager
 import android.os.Binder
 import android.os.Build
 import android.os.IBinder
+import android.os.PowerManager
 import android.util.Log
 import androidx.annotation.GuardedBy
 import androidx.annotation.WorkerThread
@@ -179,6 +180,7 @@ class SyncthingService : Service(), SyncthingStatusReceiver,
     private lateinit var prefs: Preferences
     private lateinit var notifications: Notifications
     private lateinit var connectivityManager: ConnectivityManager
+    private lateinit var powerManager: PowerManager
     private val runnerThread = Thread(::runner)
 
     private val stateLock = Object()
@@ -194,6 +196,8 @@ class SyncthingService : Service(), SyncthingStatusReceiver,
     private var networkSufficient = false
     @GuardedBy("stateLock")
     private var batterySufficient = false
+    @GuardedBy("stateLock")
+    private var isBatterySaverMode = false
 
     @GuardedBy("stateLock")
     private var runningProxyInfo: ProxyInfo? = null
@@ -205,6 +209,7 @@ class SyncthingService : Service(), SyncthingStatusReceiver,
         get() = networkConnected
                 && (!prefs.requireUnmeteredNetwork || networkSufficient)
                 && (!prefs.requireSufficientBattery || batterySufficient)
+                && (!prefs.respectBatterySaver || !isBatterySaverMode)
 
     private val shouldRun: Boolean
         @GuardedBy("stateLock")
@@ -314,6 +319,18 @@ class SyncthingService : Service(), SyncthingStatusReceiver,
         }
     }
 
+    private val batterySaverReceiver = object : BroadcastReceiver() {
+        override fun onReceive(context: Context, intent: Intent) {
+            synchronized(stateLock) {
+                isBatterySaverMode = powerManager.isPowerSaveMode
+
+                Log.d(TAG, "Battery saver mode changed: $isBatterySaverMode")
+
+                stateChanged()
+            }
+        }
+    }
+
     private val proxyChangeReceiver = object : BroadcastReceiver() {
         override fun onReceive(context: Context, intent: Intent) {
             Log.d(TAG, "Proxy settings changed")
@@ -344,7 +361,11 @@ class SyncthingService : Service(), SyncthingStatusReceiver,
         connectivityManager = getSystemService(ConnectivityManager::class.java)
         connectivityManager.registerDefaultNetworkCallback(networkCallback)
 
+        powerManager = getSystemService(PowerManager::class.java)
+        isBatterySaverMode = powerManager.isPowerSaveMode
+
         registerReceiver(batteryStatusReceiver, IntentFilter(Intent.ACTION_BATTERY_CHANGED))
+        registerReceiver(batterySaverReceiver, IntentFilter(PowerManager.ACTION_POWER_SAVE_MODE_CHANGED))
         registerReceiver(proxyChangeReceiver, IntentFilter(Proxy.PROXY_CHANGE_ACTION))
 
         runnerThread.start()
@@ -398,6 +419,7 @@ class SyncthingService : Service(), SyncthingStatusReceiver,
             Preferences.PREF_MANUAL_SHOULD_RUN,
             Preferences.PREF_REQUIRE_UNMETERED_NETWORK,
             Preferences.PREF_REQUIRE_SUFFICIENT_BATTERY,
+            Preferences.PREF_RESPECT_BATTERY_SAVER,
             Preferences.PREF_KEEP_ALIVE -> stateChanged()
             Preferences.PREF_DEBUG_MODE -> setLogLevel()
         }

app/src/main/res/values/strings.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!--
-    SPDX-FileCopyrightText: 2025 Andrew Gunnerson
+    SPDX-FileCopyrightText: 2025-2026 Andrew Gunnerson
     SPDX-License-Identifier: GPL-3.0-only
 -->
 <resources>
@@ -33,6 +33,8 @@
     <string name="pref_require_unmetered_network_desc">Only run if the device is connected to an unmetered network (eg. Wi-Fi).</string>
     <string name="pref_require_sufficient_battery_name">Require sufficient battery level</string>
     <string name="pref_require_sufficient_battery_desc">Only run if the battery level is not low or if the device is charging.</string>
+    <string name="pref_respect_battery_saver_name">Respect battery saver mode</string>
+    <string name="pref_respect_battery_saver_desc">Only run when Android\'s battery saver mode is disabled.</string>
     <string name="pref_keep_alive_name">Keep Syncthing alive</string>
     <string name="pref_keep_alive_desc">When Syncthing should not run, pause it instead of shutting it down. The avoids a potential performance hit when scanning large folders on startup.</string>
     <string name="pref_version_name">Version</string>

app/src/main/res/xml/preferences_root.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!--
-    SPDX-FileCopyrightText: 2023-2025 Andrew Gunnerson
+    SPDX-FileCopyrightText: 2023-2026 Andrew Gunnerson
     SPDX-License-Identifier: GPL-3.0-only
 -->
 <PreferenceScreen xmlns:app="http://schemas.android.com/apk/res-auto">
@@ -96,6 +96,13 @@
             app:summary="@string/pref_require_sufficient_battery_desc"
             app:iconSpaceReserved="false" />
 
+        <SwitchPreferenceCompat
+            app:key="respect_battery_saver"
+            app:defaultValue="true"
+            app:title="@string/pref_respect_battery_saver_name"
+            app:summary="@string/pref_respect_battery_saver_desc"
+            app:iconSpaceReserved="false" />
+
         <SwitchPreferenceCompat
             app:key="keep_alive"
             app:defaultValue="true"