How to call Android Api from NativeScript (LAC, CID, MCC, MNC) - nativescript

Question

I have following piece of code created in Android Studio:
public void onClick(View v) {
final TelephonyManager telephony = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
if (telephony.getPhoneType() == TelephonyManager.PHONE_TYPE_GSM) {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
final GsmCellLocation location = (GsmCellLocation) telephony.getCellLocation();
if (location != null) {
Toast.makeText(MainActivity.this,"LAC: " + location.getLac() + " CID: " + location.getCid(),Toast.LENGTH_LONG).show();
}
}
}
If NativeScript have 100% access do Android API how reach same result in .ts NativeScript?

Answer 1

Please refer the docs on Java to JS to understand how the native api calls are marshalled into JS / TS.
You will be able to get the current activity from application module with application.android.foregroundActivity. So the code below should return instance of telephony manager.
const telephony = application.android.foregroundActivity.getSystemService(android.content.Context.TELEPHONY_SERVICE)
Use nativescript-permissions plugin to acquire permissions or to know whether your app already has the required permissions on device.
There is also nativescript-toast plugin that implements cross platform toast messages.

Answer 2

Thanks Manoj for useful help.
So steps that needed to be taken are:
Install:
npm install tns-platform-declarations --save-dev
Add two lines into references.d.ts, in my case it was in file ProjectName\references.d.ts
/// <reference path="node_modules/tns-platform-declarations/android.d.ts" />
/// <reference path="node_modules/tns-platform-declarations/ios.d.ts" />
Install nativescript-permissions plugin: tns plugin add nativescript-permissions
Install nativescript-toast plugin $ tns plugin add nativescript-toast
Import libraries on the begining of file
var application = require("application");
const permissions = require( "nativescript-permissions" );
import * as Toast from 'nativescript-toast';
And write code to get LAC, CID, MCC, MNC
buttonGetInfoTap(args) {
const telephonyService = application.android.foregroundActivity.getSystemService(android.content.Context.TELEPHONY_SERVICE);
permissions.requestPermission(android.Manifest.permission.ACCESS_COARSE_LOCATION, "I need these permissions because I'm cool")
.then( () => {
if (telephonyService.getPhoneType() == android.telephony.TelephonyManager.PHONE_TYPE_GSM) {
let location = <android.telephony.gsm.GsmCellLocation>telephonyService.getCellLocation();
if (location != null) {
console.log("LAC: " + location.getLac() + " CID: " + location.getCid())
Toast.makeText("LAC: " + location.getLac() + " CID: " + location.getCid(), "long").show();
const networkOperator = telephonyService.getNetworkOperator();
const MCC =networkOperator.substring(0,3)
const MNC =networkOperator.substring(3)
Toast.makeText("MCC:"+MCC+"MNC:"+MNC, "long").show();
}
}
})
.catch( () => {
Toast.makeText("No permission", "long").show();
});
}