MDK Extension for Native Android Bluetooth Functionalities

[muhammad_rafay]

Dear Experts,

I'm trying to create an extension for native android Bluetooth functionalities, I. have created Extension plugin and I'm directly calling the java class methods by importing from "@nativescript/core/application"; not created the .aar files.
Only isEnabled() is working fine with the BluetoothAdapter.ACTION_REQUEST_ENABLE intent parameter.
Others like
1. discovering device through registerBroadcastReceiver call back methods with ACTION_FOUND
2. getBondedDevices() are not working as expected.

paired devices or scanning the devices are not returning the device details.
Can you please help me to understand how can we use native android Bluetooth class methods. I have attached the code snippet for your reference.

androidApp.registerBroadcastReceiver(
android.bluetooth.BluetoothAdapter.ACTION_STATE_CHANGED,
(context, intent) => {
const state = intent.getIntExtra(android.bluetooth.BluetoothAdapter.EXTRA_STATE, android.bluetooth.BluetoothAdapter.ERROR);
if(android.bluetooth.BluetoothAdapter.STATE_ON) {
const adapter = android.bluetooth.BluetoothAdapter.getDefaultAdapter();
let BTPairSet = adapter.getBondedDevices();
//alert(JSON.stringify(BTPairSet));
var setToObject = Object.assign({}, ...Array.from(BTPairSet));
//alert(JSON.stringify(setToObject));

Thanks,

Krishna

[muhammad_rafay]

Will need some more information. What is the metadata look like? What is the javascript file look like? How are you directly calling the Native Android function from javascript?

[kakkem]

Hi Muhammad,
I have followed the standard process of creating the extension module, control and Class name.
1. Created an extension with the <Appname>Module and Extension.ts and class.
2. Create a Plugin to use the native android class methods.
3. Add the plugin in the extension
4. imported all the required nativescript ts files for the android as follows

import { android as androidApp } from "@nativescript/core/application";

created the methods to use the native android methods.
attached the android.ts file for reference

import { View } from "@nativescript/core/ui/core/view";
import { device as Device } from '@nativescript/core/platform';
import * as app from "@nativescript/core/application";
import { confirm } from "@nativescript/core/ui/dialogs";
import { android as androidApp } from "@nativescript/core/application";

declare var com: any;
declare var android: any;
function getPadding() {
// Return left & right padding in dp
// For tablet we want 24dp, for other type we use 16dp
return Device.deviceType === 'Tablet' ? 24 : 16;
}
export class MySlider extends View {

public constructor(input) {
super();
this.createNativeView();
}
public createNativeView(): Object {

//Create a LinearLayout container to contain the label and seekbar
this._layout = new android.widget.LinearLayout(app.android.context);
this._layout.setLayoutParams(new android.view.ViewGroup.LayoutParams(-1, -2));

this._layout.setPadding(5, 16, 5, 16);
startBluetooth();

this.setNativeView(this._layout);
return this._layout;
}
}

export function startBluetooth() {
const adapter = android.bluetooth.BluetoothAdapter.getDefaultAdapter();
if(!(adapter.isEnabled())) {
androidApp.foregroundActivity.startActivityForResult(
new android.content.Intent(android.bluetooth.BluetoothAdapter.ACTION_REQUEST_ENABLE),1
);
}
GetPairedDevices();
}

export function GetPairedDevices() {
androidApp.registerBroadcastReceiver(
android.bluetooth.BluetoothAdapter.ACTION_STATE_CHANGED,
(context, intent) => {
const state = intent.getIntExtra(android.bluetooth.BluetoothAdapter.EXTRA_STATE, android.bluetooth.BluetoothAdapter.ERROR);
if(android.bluetooth.BluetoothAdapter.STATE_ON) {
const adapter = android.bluetooth.BluetoothAdapter.getDefaultAdapter();
let BTPairSet = adapter.getBondedDevices();
//alert(JSON.stringify(BTPairSet));
var setToObject = Object.assign({}, ...Array.from(BTPairSet));
//alert(JSON.stringify(setToObject));
}
})

}

Thanks,

Krishna.