Respect system DataSaver

app/src/main/kotlin/org/koitharu/kotatsu/core/prefs/AppSettings.kt

@@ -2,7 +2,9 @@ package org.koitharu.kotatsu.core.prefs
 
 import android.content.Context
 import android.content.SharedPreferences
+import android.net.ConnectivityManager
 import android.net.Uri
+import android.os.Build
 import android.provider.Settings
 import androidx.annotation.FloatRange
 import androidx.appcompat.app.AppCompatDelegate
@@ -179,7 +181,11 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 	val isUnstableUpdatesAllowed: Boolean
 		get() = prefs.getBoolean(KEY_UPDATES_UNSTABLE, false)
 
-	fun isContentPrefetchEnabled(): Boolean {
+	val isContentPrefetchEnabled: Boolean
+		get() {
+			if (isBackgroundNetworkRestricted()) {
+				return false
+			}
 			val policy = NetworkPolicy.from(prefs.getString(KEY_PREFETCH_CONTENT, null), NetworkPolicy.NEVER)
 			return policy.isNetworkAllowed(connectivityManager)
 		}
@@ -301,7 +307,11 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 		get() = prefs.getFloat(KEY_READER_AUTOSCROLL_SPEED, 0f)
 		set(@FloatRange(from = 0.0, to = 1.0) value) = prefs.edit { putFloat(KEY_READER_AUTOSCROLL_SPEED, value) }
 
-	fun isPagesPreloadEnabled(): Boolean {
+	val isPagesPreloadEnabled: Boolean
+		get() {
+			if (isBackgroundNetworkRestricted()) {
+				return false
+			}
 			val policy = NetworkPolicy.from(prefs.getString(KEY_PAGES_PRELOAD, null), NetworkPolicy.NON_METERED)
 			return policy.isNetworkAllowed(connectivityManager)
 		}
@@ -342,6 +352,14 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 
 	fun observe() = prefs.observe()
 
+	private fun isBackgroundNetworkRestricted(): Boolean {
+		return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+			connectivityManager.restrictBackgroundStatus == ConnectivityManager.RESTRICT_BACKGROUND_STATUS_ENABLED
+		} else {
+			false
+		}
+	}
+
 	companion object {
 
 		const val PAGE_SWITCH_TAPS = "taps"

app/src/main/kotlin/org/koitharu/kotatsu/details/service/MangaPrefetchService.kt

@@ -116,7 +116,7 @@ class MangaPrefetchService : CoroutineIntentService() {
 				return false
 			}
 			val entryPoint = EntryPointAccessors.fromApplication(context, PrefetchCompanionEntryPoint::class.java)
-			return entryPoint.contentCache.isCachingEnabled && entryPoint.settings.isContentPrefetchEnabled()
+			return entryPoint.contentCache.isCachingEnabled && entryPoint.settings.isContentPrefetchEnabled
 		}
 	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/reader/domain/PageLoader.kt

@@ -74,7 +74,7 @@ class PageLoader @Inject constructor(
 	}
 
 	fun isPrefetchApplicable(): Boolean {
-		return repository is RemoteMangaRepository && settings.isPagesPreloadEnabled()
+		return repository is RemoteMangaRepository && settings.isPagesPreloadEnabled
 	}
 
 	@AnyThread