make the foreground service an option

NOTES

@@ -331,6 +331,17 @@ get wedged, it might even be a flaw in Dropbear that makes it so
 unreliable with Nougat.
 
 
+October 16, 2016.
+
+I've been using a foreground service for a while, and it has not caused
+me any troubles.  The thing I have been most anxious about is that it
+might disable doze mode entirely...but there has not been any noteworthy
+overnight drain.
+
+So, in case someone does have problems with it, I am making it an option
+that defaults to enabled.
+
+
 XXX - make clicking on the notification go to the app?
 
 XXX - support password-based logins for boot-strapping?

res/xml/preferences.xml

@@ -4,6 +4,11 @@
 	android:key="onboot"
 	android:title="Start on Boot"
 	android:defaultValue="false" />
+    <CheckBoxPreference
+	android:key="foreground"
+	android:title="Foreground service"
+	android:summary="Enable a notification while running, and run with more priority (especially in Doze mode)."
+	android:defaultValue="true" />
     <EditTextPreference
 	android:key="port"
 	android:title="Port Number"

src/org/galexander/sshd/Prefs.java

@@ -16,6 +16,9 @@ public class Prefs {
 	public static boolean get_onboot() {
 		return pref.getBoolean("onboot", false);
 	}
+	public static boolean get_foreground() {
+		return pref.getBoolean("foreground", true);
+	}
 	public static boolean get_rsyncbuffer() {
 		return pref.getBoolean("rsyncbuffer", false);
 	}

src/org/galexander/sshd/SimpleSSHDService.java

@@ -17,6 +17,7 @@ public class SimpleSSHDService extends Service {
 	private static int sshd_pid = 0;
 	private static long sshd_when = 0;
 	private static long sshd_duration = 0;
+	private static boolean foregrounded = false;
 
 	public void onCreate() {
 		super.onCreate();
@@ -55,10 +56,14 @@ public class SimpleSSHDService extends Service {
 	}
 
 	private void do_foreground() {
-		Notification n = new Notification(R.drawable.notification_icon,
-					"SimpleSSHD", 0);
-		n.tickerText = "SimpleSSHD";
-		startForeground(1, n);
+		foregrounded = Prefs.get_foreground();
+		if (foregrounded) {
+			Notification n = new Notification(
+						R.drawable.notification_icon,
+						"SimpleSSHD", 0);
+			n.tickerText = "SimpleSSHD";
+			startForeground(1, n);
+		}
 	}
 
 	public static boolean is_started() {
@@ -78,7 +83,10 @@ public class SimpleSSHDService extends Service {
 
 	private void stop_service() {
 		stopSelf();
-		stopForeground(true);
+		if (foregrounded) {
+			stopForeground(true);
+			foregrounded = false;
+		}
 	}
 
 	private static void maybe_restart(int pid) {