VehicleDataScreen: add heading

app/src/google/java/net/vonforst/evmap/auto/VehicleDataScreen.kt

@@ -6,9 +6,7 @@ import android.os.Looper
 import androidx.car.app.CarContext
 import androidx.car.app.Screen
 import androidx.car.app.hardware.CarHardwareManager
-import androidx.car.app.hardware.info.EnergyLevel
-import androidx.car.app.hardware.info.Model
-import androidx.car.app.hardware.info.Speed
+import androidx.car.app.hardware.info.*
 import androidx.car.app.model.*
 import androidx.core.content.ContextCompat
 import androidx.core.graphics.drawable.IconCompat
@@ -17,6 +15,7 @@ import androidx.lifecycle.LifecycleObserver
 import androidx.lifecycle.OnLifecycleEvent
 import net.vonforst.evmap.BuildConfig
 import net.vonforst.evmap.R
+import net.vonforst.evmap.ui.CompassNeedle
 import net.vonforst.evmap.ui.Gauge
 import kotlin.math.min
 import kotlin.math.roundToInt
@@ -26,7 +25,10 @@ class VehicleDataScreen(ctx: CarContext) : Screen(ctx), LifecycleObserver {
     private var model: Model? = null
     private var energyLevel: EnergyLevel? = null
     private var speed: Speed? = null
+    private var heading: Compass? = null
     private var gauge = Gauge((ctx.resources.displayMetrics.density * 128).roundToInt(), ctx)
+    private var compass =
+        CompassNeedle((ctx.resources.displayMetrics.density * 128).roundToInt(), ctx)
     private val maxSpeed = 160f / 3.6f // m/s, speed gauge will show max if speed is higher
 
     private val permissions = if (BuildConfig.FLAVOR_automotive == "automotive") {
@@ -66,6 +68,7 @@ class VehicleDataScreen(ctx: CarContext) : Screen(ctx), LifecycleObserver {
         val energyLevel = energyLevel
         val model = model
         val speed = speed
+        val heading = heading
 
         return GridTemplate.Builder().apply {
             setTitle(
@@ -182,6 +185,25 @@ class VehicleDataScreen(ctx: CarContext) : Screen(ctx), LifecycleObserver {
                                 }
                             }
                         }.build())
+                        addItem(GridItem.Builder().apply {
+                            setTitle(carContext.getString(R.string.auto_heading))
+                            if (heading == null) {
+                                setLoading(true)
+                            } else {
+                                val heading = heading.orientations.value
+                                if (heading != null) {
+                                    setText(
+                                        "${heading[0].roundToInt()}°"
+                                    )
+
+                                } else {
+                                    setText(carContext.getString(R.string.auto_no_data))
+                                }
+                                setImage(
+                                    compass.draw(heading?.get(0)).asCarIcon()
+                                )
+                            }
+                        }.build())
                     }.build()
                 )
             }
@@ -198,6 +220,11 @@ class VehicleDataScreen(ctx: CarContext) : Screen(ctx), LifecycleObserver {
         invalidate()
     }
 
+    private fun onCompassUpdated(compass: Compass) {
+        this.heading = compass
+        invalidate()
+    }
+
     @OnLifecycleEvent(Lifecycle.Event.ON_RESUME)
     private fun setupListeners() {
         if (!permissionsGranted()) return
@@ -207,6 +234,11 @@ class VehicleDataScreen(ctx: CarContext) : Screen(ctx), LifecycleObserver {
         val exec = ContextCompat.getMainExecutor(carContext)
         hardwareMan.carInfo.addEnergyLevelListener(exec, ::onEnergyLevelUpdated)
         hardwareMan.carInfo.addSpeedListener(exec, ::onSpeedUpdated)
+        hardwareMan.carSensors.addCompassListener(
+            CarSensors.UPDATE_RATE_NORMAL,
+            exec,
+            ::onCompassUpdated
+        )
 
         hardwareMan.carInfo.fetchModel(exec) {
             this.model = it
@@ -219,6 +251,7 @@ class VehicleDataScreen(ctx: CarContext) : Screen(ctx), LifecycleObserver {
         println("Removing energy level listener")
         hardwareMan.carInfo.removeEnergyLevelListener(::onEnergyLevelUpdated)
         hardwareMan.carInfo.removeSpeedListener(::onSpeedUpdated)
+        hardwareMan.carSensors.removeCompassListener(::onCompassUpdated)
     }
 
     private fun permissionsGranted(): Boolean =

app/src/google/java/net/vonforst/evmap/ui/CompassNeedle.kt

@@ -0,0 +1,33 @@
+package net.vonforst.evmap.ui
+
+import android.content.Context
+import android.graphics.Bitmap
+import android.graphics.Canvas
+import android.graphics.Color
+import android.graphics.PorterDuff
+import androidx.core.content.ContextCompat
+import net.vonforst.evmap.R
+
+class CompassNeedle(val size: Int, ctx: Context) {
+    val image = ContextCompat.getDrawable(ctx, R.drawable.ic_navigation)!!
+
+    init {
+        image.setTint(Color.WHITE)
+        image.setBounds(0, 0, size, size)
+    }
+
+    fun draw(angle: Float?): Bitmap {
+        val bitmap = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888)
+        val canvas = Canvas(bitmap)
+
+        canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR)
+
+        if (angle != null) {
+            canvas.save()
+            canvas.rotate(-angle, size / 2f, size / 2f)
+            image.draw(canvas)
+            canvas.restore()
+        }
+        return bitmap
+    }
+}

app/src/google/res/values-de/values.xml

@@ -27,6 +27,7 @@
     <string name="auto_no_data">Nicht verfügbar</string>
     <string name="auto_range">Reichweite</string>
     <string name="auto_speed">Geschwindigkeit</string>
+    <string name="auto_heading">Fahrtrichtung</string>
     <string name="auto_settings">Einstellungen</string>
     <string name="welcome_android_auto">Android Auto-Unterstützung</string>
     <string name="welcome_android_auto_detail">Auf unterstützen Autos kannst du EVMap auch mit Android Auto nutzen. Öffne dazu einfach die EVMap-App aus dem Menü von Android Auto.</string>

app/src/google/res/values/values.xml

@@ -37,6 +37,7 @@
     <string name="auto_no_data">Unavailable</string>
     <string name="auto_range">Range</string>
     <string name="auto_speed">Speed</string>
+    <string name="auto_heading">Heading</string>
     <string name="auto_settings">Settings</string>
     <string name="welcome_android_auto">Android Auto support</string>
     <string name="welcome_android_auto_detail">You can also use EVMap from within Android Auto on supported cars. Simply select the EVMap app in the Android Auto menu.</string>