aux/android: Create an interface for handling foreground service notification

src/xrt/auxiliary/android/src/main/java/org/freedesktop/monado/auxiliary/IServiceNotification.kt

@@ -0,0 +1,33 @@
+// Copyright 2020, Collabora, Ltd.
+// SPDX-License-Identifier: BSL-1.0
+/*!
+ * @file
+ * @brief  Interface used by the IPC service to create a notification to keep it in the foreground..
+ * @author Ryan Pavlik <ryan.pavlik@collabora.com>
+ * @ingroup aux_android
+ */
+
+package org.freedesktop.monado.auxiliary
+
+import android.app.Notification
+import android.app.PendingIntent
+import android.content.Context
+
+/**
+ * Interface for handling a foreground service notification.
+ *
+ * Exists so that the service itself doesn't have to deal with UI details.
+ */
+interface IServiceNotification {
+
+    /**
+     * Create and return a notification (creating the channel if applicable) that can be used in
+     * {@code Service#startForeground()}
+     */
+    fun buildNotification(context: Context, pendingShutdownIntent: PendingIntent): Notification
+
+    /**
+     * Return the notification ID to use
+     */
+    fun getNotificationId(): Int
+}