fix crash on ipv6 enable & reduce provider call

service/src/main/java/com/github/kr328/clash/service/ServiceSettingsProvider.kt

@@ -2,6 +2,7 @@ package com.github.kr328.clash.service
 
 import android.content.Context
 import android.content.SharedPreferences
+import rikka.preference.MultiProcessPreference
 import rikka.preference.PreferenceProvider
 
 class ServiceSettingsProvider : PreferenceProvider() {
@@ -11,4 +12,15 @@ class ServiceSettingsProvider : PreferenceProvider() {
             Context.MODE_PRIVATE
         )
     }
+
+    companion object {
+        fun createSharedPreferencesFromContext(context: Context): SharedPreferences {
+            return when ( context ) {
+                is BaseService, is TunService ->
+                    context.getSharedPreferences(Constants.SERVICE_SETTING_FILE_NAME, Context.MODE_PRIVATE)
+                else ->
+                    MultiProcessPreference(context, context.packageName + Constants.SETTING_PROVIDER_SUFFIX)
+            }
+        }
+    }
 }

service/src/main/java/com/github/kr328/clash/service/TunService.kt

@@ -190,7 +190,7 @@ class TunService : VpnService(), CoroutineScope by MainScope() {
         addAddress(PRIVATE_VLAN4_CLIENT, PRIVATE_VLAN4_SUBNET)
 
         if (settings.get(ServiceSettings.IPV6_SUPPORT))
-            addRoute(PRIVATE_VLAN6_CLIENT, 126)
+            addAddress(PRIVATE_VLAN6_CLIENT, 126)
 
         return this
     }

service/src/main/java/com/github/kr328/clash/service/settings/ServiceSettings.kt

@@ -3,15 +3,13 @@ package com.github.kr328.clash.service.settings
 import android.content.Context
 import android.content.SharedPreferences
 import com.github.kr328.clash.service.Constants
+import com.github.kr328.clash.service.ServiceSettingsProvider
 import rikka.preference.MultiProcessPreference
 
 class ServiceSettings(preference: SharedPreferences) :
     BaseSettings(preference) {
     constructor(context: Context) : this(
-        MultiProcessPreference(
-            context,
-            context.packageName + Constants.SETTING_PROVIDER_SUFFIX
-        )
+        ServiceSettingsProvider.createSharedPreferencesFromContext(context)
     )
 
     companion object {