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I'm trying to setup a small prototype to extract some information from the car using CarInfo API with the Polestar 2 Emulator.

I've been facing the problem of not being able to actually run the code. I'm following the tutorial on Using the Android for Cars App Library .

My current implementation looks like this:

HelloWorldService

class HelloWorldService: CarAppService() {
    override fun createHostValidator(): HostValidator {
        TODO("Not yet implemented")
    }

    override fun onCreateSession(): Session {
        Log.d("TEST_LOG", "HelloWorldService is called")
        return HelloWorldSession()
    }
}

HelloWorldSession

class HelloWorldSession: Session() {
    override fun onCreateScreen(intent: Intent): Screen {
        Log.d("TEST_LOG", "HelloWorldSession is called")
        CarToast.makeText(carContext, "Hello world", CarToast.LENGTH_LONG).show()
        return HelloWorldScreen(carContext)
    }
}

HelloWorldScreen


private const val TAG = "CAR_INFO"

class HelloWorldScreen(carContext: CarContext) : Screen(carContext) {
    override fun onGetTemplate(): Template {
        logCarInfo()
        Log.d(TAG, "HelloWorldScreen is called")
        val row = Row.Builder().setTitle("Hello automotive world!").build()
        val pane = Pane.Builder().addRow(row).build()
        return PaneTemplate.Builder(pane)
            .setHeaderAction(Action.APP_ICON)
            .build()
    }

    @SuppressLint("UnsafeOptInUsageError")
    fun logCarInfo() {
        val carInfo = carContext.getCarService(CarHardwareManager::class.java).carInfo
        val energyLevel = OnCarDataAvailableListener<EnergyLevel> { data ->
            Log.d(TAG, "EnergyLevel: ${data.energyIsLow}")
            Log.d(TAG, "EnergyLevel: ${data.rangeRemainingMeters}")
        }
        val speedInfo = OnCarDataAvailableListener<Speed> { data ->
            Log.d(TAG, "SpeedInfo: ${data.rawSpeedMetersPerSecond}")
            Log.d(TAG, "SpeedInfo: ${data.displaySpeedMetersPerSecond}")
        }
    }

}

Android Manifest (automotive module)

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">

    <uses-feature
        android:name="android.hardware.type.automotive"
        android:required="true" />
    <uses-feature
        android:name="android.software.car.templates_host"
        android:required="true" />
    <uses-feature
        android:name="android.hardware.wifi"
        android:required="false" />
    <uses-feature
        android:name="android.hardware.screen.portrait"
        android:required="false" />
    <uses-feature
        android:name="android.hardware.screen.landscape"
        android:required="false" />

    <uses-permission android:name="android.car.permission.CAR_INFO" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

    <uses-permission android:name="androidx.car.app.NAVIGATION_TEMPLATES" />
    <uses-permission android:name="androidx.car.app.ACCESS_SURFACE" />
    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />

    <application
        android:allowBackup="true"
        android:appCategory="video"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.ContextInfo">
        <meta-data
            android:name="com.android.automotive"
            android:resource="@xml/automotive_app_desc" />

        <service
            android:name=".HelloWorldService"
            android:exported="true">
            <intent-filter>
                <action android:name="androidx.car.app.CarAppService" />
            </intent-filter>
        </service>

    </application>

</manifest>

As I understood from the docs Android Automotive apps don't launch with an Activity and rather are services but I don't get how to actually run it? I'm trying to keep track with the Logs on what is being launched but with no success at all.

Would appreciate your support.

0 Answers0