Update support lib to 28.0.0-alpha3

mobile/src/main/java/be/mygod/vpnhotspot/App.kt

@@ -13,6 +13,7 @@ import android.preference.PreferenceManager
 import android.support.annotation.StringRes
 import android.widget.Toast
 import be.mygod.vpnhotspot.util.Event0
+import be.mygod.vpnhotspot.util.systemService
 
 class App : Application() {
     companion object {
@@ -43,8 +44,8 @@ class App : Application() {
     lateinit var deviceContext: Context
     val handler = Handler()
     val pref: SharedPreferences by lazy { PreferenceManager.getDefaultSharedPreferences(deviceContext) }
-    val connectivity by lazy { getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager }
-    val wifi by lazy { app.getSystemService(Context.WIFI_SERVICE) as WifiManager }
+    val connectivity by lazy { systemService<ConnectivityManager>() }
+    val wifi by lazy { systemService<WifiManager>() }
 
     val operatingChannel: Int get() {
         val result = pref.getString(KEY_OPERATING_CHANNEL, null)?.toIntOrNull() ?: 0

mobile/src/main/java/be/mygod/vpnhotspot/RepeaterService.kt

@@ -131,7 +131,7 @@ class RepeaterService : Service(), WifiP2pManager.ChannelListener, SharedPrefere
     override fun onCreate() {
         super.onCreate()
         try {
-            p2pManager = getSystemService(Context.WIFI_P2P_SERVICE) as WifiP2pManager
+            p2pManager = systemService()
             onChannelDisconnected()
             app.pref.registerOnSharedPreferenceChangeListener(this)
         } catch (exc: TypeCastException) {

mobile/src/main/java/be/mygod/vpnhotspot/ServiceNotification.kt

@@ -8,13 +8,14 @@ import android.os.Build
 import android.support.v4.app.NotificationCompat
 import android.support.v4.content.ContextCompat
 import be.mygod.vpnhotspot.App.Companion.app
+import be.mygod.vpnhotspot.util.systemService
 
 object ServiceNotification {
     private const val CHANNEL = "tethering"
     private const val CHANNEL_ID = 1
 
     private val deviceCountsMap = HashMap<Service, Map<String, Int>>()
-    private val manager = app.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
+    private val manager = app.systemService<NotificationManager>()
 
     private fun buildNotification(context: Context): Notification {
         val builder = NotificationCompat.Builder(context, CHANNEL)

mobile/src/main/java/be/mygod/vpnhotspot/SettingsPreferenceFragment.kt

@@ -18,14 +18,14 @@ import be.mygod.vpnhotspot.preference.SharedPreferenceDataStore
 import be.mygod.vpnhotspot.util.loggerSuStream
 import be.mygod.vpnhotspot.util.put
 import com.crashlytics.android.Crashlytics
-import com.takisoft.fix.support.v7.preference.PreferenceFragmentCompatDividers
+import com.takisoft.fix.support.v7.preference.PreferenceFragmentCompat
 import java.io.File
 import java.io.IOException
 import java.io.PrintWriter
 import java.net.NetworkInterface
 import java.net.SocketException
 
-class SettingsPreferenceFragment : PreferenceFragmentCompatDividers() {
+class SettingsPreferenceFragment : PreferenceFragmentCompat() {
     private val customTabsIntent by lazy {
         CustomTabsIntent.Builder()
                 .setToolbarColor(ContextCompat.getColor(requireContext(), R.color.colorPrimary))

mobile/src/main/java/be/mygod/vpnhotspot/manage/LocalOnlyHotspotManager.kt

@@ -20,6 +20,7 @@ import be.mygod.vpnhotspot.databinding.ListitemInterfaceBinding
 import be.mygod.vpnhotspot.net.TetherType
 import be.mygod.vpnhotspot.util.ServiceForegroundConnector
 import be.mygod.vpnhotspot.util.formatAddresses
+import be.mygod.vpnhotspot.util.systemService
 import com.crashlytics.android.Crashlytics
 import java.net.NetworkInterface
 
@@ -51,7 +52,7 @@ class LocalOnlyHotspotManager(private val parent: TetheringFragment) : Manager()
                 if (if (Build.VERSION.SDK_INT < 28) @Suppress("DEPRECATION") {
                             Settings.Secure.getInt(view.context.contentResolver, Settings.Secure.LOCATION_MODE,
                                     Settings.Secure.LOCATION_MODE_OFF) == Settings.Secure.LOCATION_MODE_OFF
-                        } else !context.getSystemService(LocationManager::class.java).isLocationEnabled) {
+                        } else !context.systemService<LocationManager>().isLocationEnabled) {
                     Toast.makeText(view.context, R.string.tethering_temp_hotspot_location, Toast.LENGTH_LONG).show()
                     try {
                         view.context.startActivity(Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS))

mobile/src/main/java/be/mygod/vpnhotspot/util/Utils.kt

@@ -4,6 +4,7 @@ import android.content.*
 import android.databinding.BindingAdapter
 import android.os.Bundle
 import android.support.annotation.DrawableRes
+import android.support.v4.content.ContextCompat
 import android.util.Log
 import android.view.View
 import android.widget.ImageView
@@ -29,6 +30,8 @@ fun intentFilter(vararg actions: String): IntentFilter {
     return result
 }
 
+inline fun <reified T> Context.systemService() = ContextCompat.getSystemService(this, T::class.java)!!
+
 fun Bundle.put(key: String, map: Array<String>): Bundle {
     putStringArray(key, map)
     return this