coroutines: convert the rest

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

ui/src/main/java/com/wireguard/android/activity/BaseActivity.kt

@@ -9,6 +9,9 @@ import androidx.databinding.CallbackRegistry
 import androidx.databinding.CallbackRegistry.NotifierCallback
 import com.wireguard.android.Application
 import com.wireguard.android.model.ObservableTunnel
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.launch
 
 /**
  * Base class for activities that need to remember the currently-selected tunnel.
@@ -35,11 +38,8 @@ abstract class BaseActivity : ThemeChangeAwareActivity() {
             intent != null -> intent.getStringExtra(KEY_SELECTED_TUNNEL)
             else -> null
         }
-        if (savedTunnelName != null) {
-            Application.getTunnelManager()
-                    .tunnels
-                    .thenAccept { selectedTunnel = it[savedTunnelName] }
-        }
+        if (savedTunnelName != null)
+            GlobalScope.launch(Dispatchers.Main.immediate) { selectedTunnel = Application.getTunnelManager().getTunnels()[savedTunnelName] }
 
         // The selected tunnel must be set before the superclass method recreates fragments.
         super.onCreate(savedInstanceState)
@@ -51,6 +51,7 @@ abstract class BaseActivity : ThemeChangeAwareActivity() {
     }
 
     protected abstract fun onSelectedTunnelChanged(oldTunnel: ObservableTunnel?, newTunnel: ObservableTunnel?)
+
     fun removeOnSelectedTunnelChangedListener(
             listener: OnSelectedTunnelChangedListener) {
         selectionChangeRegistry.remove(listener)