Create `ServiceAwareFragment` helper class

2 files changed, 48 insertions, 1 deletions

diff --git a/android/src/main/kotlin/net/mullvad/mullvadvpn/ui/MainActivity.kt b/android/src/main/kotlin/net/mullvad/mullvadvpn/ui/MainActivity.kt
index 4780433223..f9c9f24bac 100644
--- a/android/src/main/kotlin/net/mullvad/mullvadvpn/ui/MainActivity.kt
+++ b/android/src/main/kotlin/net/mullvad/mullvadvpn/ui/MainActivity.kt
@@ -30,7 +30,7 @@ class MainActivity : FragmentActivity() {
         val KEY_SHOULD_CONNECT = "should_connect"
     }
 
-    var serviceConnection: ServiceConnection? = null
+    private var serviceConnection: ServiceConnection? = null
     private var serviceConnectionSubscription: Int? = null
 
     var daemon = CompletableDeferred<MullvadDaemon>()
diff --git a/android/src/main/kotlin/net/mullvad/mullvadvpn/ui/ServiceAwareFragment.kt b/android/src/main/kotlin/net/mullvad/mullvadvpn/ui/ServiceAwareFragment.kt
new file mode 100644
index 0000000000..833f539a75
--- /dev/null
+++ b/android/src/main/kotlin/net/mullvad/mullvadvpn/ui/ServiceAwareFragment.kt
@@ -0,0 +1,47 @@
+package net.mullvad.mullvadvpn.ui
+
+import android.content.Context
+import android.support.v4.app.Fragment
+
+abstract class ServiceAwareFragment : Fragment() {
+    lateinit var parentActivity: MainActivity
+        private set
+
+    var serviceConnection: ServiceConnection? = null
+        private set
+
+    private var subscriptionId: Int? = null
+
+    override fun onAttach(context: Context) {
+        super.onAttach(context)
+
+        parentActivity = context as MainActivity
+
+        subscriptionId = parentActivity.serviceNotifier.subscribe { connection ->
+            configureServiceConnection(connection)
+        }
+    }
+
+    override fun onDetach() {
+        subscriptionId?.let { id ->
+            parentActivity.serviceNotifier.unsubscribe(id)
+        }
+
+        super.onDetach()
+    }
+
+    abstract fun onNewServiceConnection(serviceConnection: ServiceConnection)
+
+    open fun onNoServiceConnection() {
+    }
+
+    private fun configureServiceConnection(connection: ServiceConnection?) {
+        serviceConnection = connection
+
+        if (connection != null) {
+            onNewServiceConnection(connection)
+        } else {
+            onNoServiceConnection()
+        }
+    }
+}