NativeScript Android Background Service - nativescript

Question

I am developing NativeScript android application. I am new to NativeScript. I want to run background service, which is checking service periodically and give notifications to user even though app not opened on device. I followed instructions from Nativescript site
https://www.nativescript.org/blog/using-android-background-services-in-nativescript
But when i call setupAlarm function, i received error can't instantiate class com.tns.notifications.NotificationIntentService; no empty constructor
please help me. i give full exception details below
The application crashed because of an uncaught exception. You can look at "stackTrace" or "nativeException" for more detailed information about the exception.
An uncaught Exception occurred on "main" thread.
java.lang.RuntimeException: Unable to instantiate service com.tns.notifications.NotificationIntentService: java.lang.InstantiationException: can't instantiate class com.tns.notifications.NotificationIntentService; no empty constructor
at android.app.ActivityThread.handleCreateService(ActivityThread.java:2543)
at android.app.ActivityThread.access$1800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.InstantiationException: can't instantiate class com.tns.notifications.NotificationIntentService; no empty constructor
at java.lang.Class.newInstanceImpl(Native Method)
at java.lang.Class.newInstance(Class.java:1208)
at android.app.ActivityThread.handleCreateService(ActivityThread.java:2540)
... 10 more

Answer 1

To solve the no empty constructor issue, you can use nativescript-android-utils like this:
Install:
npm install nativescript-android-utils --save
In you code:
com.pip3r4o.android.app.IntentService.extend("com.mypackage.MyClass", {
onHandleIntent: function(){}
});
Now, com.mypackage.MyClass will have an empty constructor.

Answer 2

i found working nativescript android background service project from here
https://github.com/NativeScript/sample-android-background-services

Answer 3

The latest release of Nativescript allows you to use workers for multithreading applications. I believe it's what you should be using. In the tutorial you provided they also mention using web workers in the future.
What’s next
In the upcoming releases we will be rolling out support for the Web
Workers feature in NativeScript, allowing you to execute code in a
background thread, all through Angular/JavaScript.
Hope it helps.