How to create object of type CarPropertyManager

[Rohit Iti]

public CarPropertyManager mCarPropertytManager;

And trying this in Service connection. 

ServiceConnection mServiceConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
Log.d(TAG, "onServiceConnected: ");
mCarPropertytManager = new CarPropertyManager(mCar, service);

.....

}

I think i need to use some ICarInterface stub but not getting how exactly to get this. 

[Frank Bouwens]

I've seen something like that in the sample app

https://github.com/android/car-samples/blob/main/AutomotiveOS/CarGearViewerKotlin/automotive/src/main/java/com/example/cargearviewer/MainActivity.kt#L88

Please try the following:

override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)

        //setContentView(R.layout.activity_main)

        //currentGearTextView = findViewById(R.id.currentGearTextView)

        // createCar() returns a "Car" object to access car service APIs. It can return null if

        // car service is not yet ready but that is not a common case and can happen on rare cases

        // (for example car service crashes) so the receiver should be ready for a null car object.

        //

        // Other variants of this API allows more control over car service functionality (such as

        // handling car service crashes graciously). Please see the SDK documentation for this.

        car = Car.createCar(this)

        carPropertyManager = car.getCarManager(Car.PROPERTY_SERVICE) as CarPropertyManager; // <--- THIS !!!

        // Subscribes to the gear change events.

        carPropertyManager.registerCallback(

            carPropertyListener,

            VehiclePropertyIds.CURRENT_GEAR,

            CarPropertyManager.SENSOR_RATE_ONCHANGE

        )

    }

Op zondag 8 november 2020 om 11:44:29 UTC+1 schreef rohit...@gmail.com:

[Rohit Iti]

Hello Frank, 

Thank you for replying. 

The one which you mentioned that example I have in kotlin bot not able to get it in java . 

Because of that am currently stuck. 

[Abhilash Mb]

HI All,

I am using the below code to get car properties such as speed and gear changed events, So far working properly. Hops this helps.

private Car myCar;

private void initCar() {
     myCar = Car.createCar(this);
     CarPropertyManager carPropertyManager = (CarPropertyManager) myCar.getCarManager(Car.PROPERTY_SERVICE);
     carPropertyManager.registerCallback(this.carPropertyListener, VehiclePropertyIds.PERF_VEHICLE_SPEED,
     CarPropertyManager.SENSOR_RATE_ONCHANGE);
}

private CarPropertyManager.CarPropertyEventCallback carPropertyListener = new CarPropertyManager.CarPropertyEventCallback() {
@Override
public void onChangeEvent(CarPropertyValue carPropertyValue) {
Log.d(TAG, "Received car property changed event" + carPropertyValue.getValue());

[Rohit Iti]

        private void initcar() {

            if(!getBaseContext().getPackageManager().hasSystemFeature(getBaseContext().getPackageManager().FEATURE_AUTOMOTIVE)){

                Log.d(TAG, "initcar: hasSystemFeature failed");

                return;

            }

            mCar = Car.createCar(this);

            carPropertyManager = (CarPropertyManager) mCar.getCarManager(Car.PROPERTY_SERVICE);

            mpropertyids = carPropertyManager.getPropertyList();

            Log.d(TAG, "initcar: List = " + mpropertyids.size());   // Always returns 0

            carPropertyManager.registerCallback(this.carPropertyListener, VehiclePropertyIds.PERF_VEHICLE_SPEED,

                    CarPropertyManager.SENSOR_RATE_ONCHANGE);

        }

        public CarPropertyManager.CarPropertyEventCallback carPropertyListener = new CarPropertyManager.CarPropertyEventCallback() {

            @Override

            public void onChangeEvent(CarPropertyValue carPropertyValue) {

                Log.d(TAG, "onChangeEvent: " + carPropertyValue.getValue());

            }

            @Override

            public void onErrorEvent(int i, int i1) {

                Log.d(TAG, "onErrorEvent: ");

            }

        };

When i run this code  am getting "CarPropertyManager: registerListener:  propId is not in config list:  291504647"

PERF_VEHICLE_SPEED = 291504647

I am assuming we need to add List<CarPropertyConfig> mpropertyids or register it somewhere . 

Am not aware how to do this .

Can anyone help me get through this ?

[Abhilash Mb]

Hi 

if(!getBaseContext().getPackageManager().hasSystemFeature(getBaseContext().getPackageManager().FEATURE_AUTOMOTIVE)){

                Log.d(TAG, "initcar: hasSystemFeature failed");

                return;

   }

I don't this this piece of code is necessary since you would have already specified it in your manifest file. 

However for properties, you need to add speed permission in your manifest.

<uses-permission android:name="android.car.permission.CAR_SPEED" />

and request for that permission before you initialize the car, something like below,

ActivityCompat.requestPermissions(this, new String[]{Car.PERMISSION_SPEED}, 101);