Use QAndroidService to properly have the service run on Android

android/AndroidManifest.xml

@@ -110,7 +110,7 @@
 
     </application>
 
-    <uses-sdk android:minSdkVersion="16" /> <!-- android:targetSdkVersion="26"/> -->
+    <uses-sdk android:minSdkVersion="21" /><!-- android:targetSdkVersion="26"/> -->
     <supports-screens android:largeScreens="true" android:normalScreens="true" android:anyDensity="true" android:smallScreens="true"/>
 
     <uses-permission android:name="android.permission.INTERNET"/>

main.go

@@ -11,6 +11,7 @@ import (
 	"flag"
 	"git.openprivacy.ca/openprivacy/libricochet-go/connectivity"
 	"git.openprivacy.ca/openprivacy/libricochet-go/log"
+	"github.com/therecipe/qt/androidextras"
 	"github.com/therecipe/qt/core"
 	"github.com/therecipe/qt/gui"
 	"github.com/therecipe/qt/network"
@@ -87,12 +88,23 @@ func main() {
 	}
 }
 
+// QRunnable is a shim for QAndroidService and QGuiApplication
+type QRunnable interface {
+	Exec() int
+}
+
 func mainService() {
 	log.Infoln("I am the service")
 	log.Infoln("Starting a cwtch app...")
 	go loadNetworkingAndFiles(nil, true, false)
-	//app := androidextras.NewQAndroidService(len(os.Args), os.Args)
-	app := gui.NewQGuiApplication(len(os.Args), os.Args)
+	var app QRunnable
+	if runtime.GOOS == "android" {
+		log.Infoln("Making QAndroidService...")
+		app = androidextras.NewQAndroidService(len(os.Args), os.Args)
+	} else {
+		log.Infoln("Making QGuiApplication...")
+		app = gui.NewQGuiApplication(len(os.Args), os.Args)
+	}
 	log.Infoln("Cwtch Service starting app.Exec")
 	app.Exec()
 }