android-util | Android Utility classes | Android library

This issue has been a plague on my migration of an application from NativeScript 5.4.0 to NativeScript 6.3.3. I am now using webpack.config.js in combination with nativescript-worker-loader (Workers).

I have performed the required steps in the webpack file and the code that breaks on tns build android works when ran on a device with tns run android.

Error on tns build android:

I am building an android library (aar file) with Kotlin. I need to obfuscate the code in a way that the 3rd party user will see the class and method names, he must be able to use them (they are pubilc), but I need to hide/obfuscate the code itself. I tried using this file for the myLibrary\proguard-rules.pro file: https://github.com/mohitrajput987/android-utility/blob/master/preference/proguard-rules.pro

but every class, method and var is changed, except for a directory that has both a Kotlin and a Java class in it, both files and directory name remained the same.

If this is what I am looking for, what must be changed for Kotlin?

Perhaps something else is wrong?

I am getting this error whenever I try to run a program in Android Studio 3.1.2.

Program type already present: com.google.android.gms.common.util.VisibleForTesting Message{kind=ERROR, text=Program type already present: com.google.android.gms.common.util.VisibleForTesting, sources=[Unknown source file], tool name=Optional.of(D8)}

My gradle Module app :

I have problem with nativescript background service. I want to write application with background service. The service must be always run in background, even when the application will be stoped and closed.

I have used nativescript-android-utils for android intent services, but the service stops working after application closes. I have also tried to register broadcast receiver according to this but the result is same: when app is closed, the service also stops working.

I want to write gps tracker background service and that's why I need to be the service always running in background.

Service code:

I have been developing an application with Android Studio, tested, and I'm ready to publish to Google Play.

When I tried to create a signed APK, after creating the keys, the gradle build stops with the following message:

I Work in a Android Project and, after Adroid Studio 3.0 update, the problems come around.

The preview of my activities stop showing data, the project's still building and I can install on emulator/Phone, but I couldnt' see all the changes that I made in XML layout, here's the error message:

I found this code does't work in my Project.

android:scrollbars="vertical"

But if i set this to a new DEMO,it works. I think it's about App styles or something in build.gradle,but i try many methods and it's just didn't work(like copy the Application styls from my project to the new project and apply it,it still works),any one else has this problem? this is my build.gradle code: