Android Auto: create a VehicleDataScreen showing state of charge

app/src/google/AndroidManifest.xml

@@ -5,8 +5,9 @@
 
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
     <uses-permission android:name="androidx.car.app.MAP_TEMPLATES" />
+    <uses-permission android:name="com.google.android.gms.permission.CAR_FUEL" />
 
-    <uses-sdk tools:overrideLibrary="androidx.car.app" />
+    <uses-sdk tools:overrideLibrary="androidx.car.app,androidx.car.app.projected" />
 
     <application>
         <meta-data

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

@@ -0,0 +1,43 @@
+package net.vonforst.evmap.auto
+
+import androidx.car.app.CarContext
+import androidx.car.app.Screen
+import androidx.car.app.hardware.CarHardwareManager
+import androidx.car.app.hardware.common.OnCarDataAvailableListener
+import androidx.car.app.hardware.info.EnergyLevel
+import androidx.car.app.model.GridItem
+import androidx.car.app.model.GridTemplate
+import androidx.car.app.model.ItemList
+import androidx.car.app.model.Template
+import androidx.core.content.ContextCompat
+
+class VehicleDataScreen(ctx: CarContext) : Screen(ctx), OnCarDataAvailableListener<EnergyLevel> {
+    val hardwareMan = ctx.getCarService(CarContext.HARDWARE_SERVICE) as CarHardwareManager
+    var energyLevel: EnergyLevel? = null
+
+    init {
+        hardwareMan.carInfo.addEnergyLevelListener(ContextCompat.getMainExecutor(ctx), this)
+    }
+
+    override fun onGetTemplate(): Template {
+        val energy = energyLevel ?: return GridTemplate.Builder().setLoading(true).build()
+
+        return GridTemplate.Builder().setSingleList(
+            ItemList.Builder().apply {
+                energy.batteryPercent.value?.let { percent ->
+                    addItem(
+                        GridItem.Builder()
+                            .setTitle("Battery")
+                            .setText("%.1f".format(percent))
+                            .build()
+                    )
+                }
+            }.build()
+        ).build()
+    }
+
+    override fun onCarDataAvailable(data: EnergyLevel) {
+        this.energyLevel = energyLevel
+        invalidate()
+    }
+}

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

@@ -6,6 +6,7 @@ import androidx.car.app.Screen
 import androidx.car.app.model.*
 import androidx.core.graphics.drawable.IconCompat
 import net.vonforst.evmap.R
+import net.vonforst.evmap.auto.screens.VehicleDataScreen
 
 /**
  * Welcome screen with selection between favorites and nearby chargers
@@ -55,6 +56,21 @@ class WelcomeScreen(ctx: CarContext, val session: EVMapSession) : Screen(ctx), L
                             screenManager.push(MapScreen(carContext, session, favorites = true))
                         }
                         .build())
+                addItem(
+                    Row.Builder()
+                        .setTitle(carContext.getString(R.string.auto_vehicle_data))
+                        .setImage(
+                            CarIcon.Builder(
+                                IconCompat.createWithResource(carContext, R.drawable.ic_car)
+                            ).setTint(CarColor.DEFAULT).build()
+                        )
+                        .setBrowsable(true)
+                        .setOnClickListener {
+                            session.mapScreen = null
+                            screenManager.push(VehicleDataScreen(carContext))
+                        }
+                        .build()
+                )
             }.build())
             setCurrentLocationEnabled(true)
             setHeaderAction(Action.APP_ICON)

app/src/google/res/drawable/ic_car.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?attr/colorControlNormal">
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M18.92,6.01C18.72,5.42 18.16,5 17.5,5h-11c-0.66,0 -1.21,0.42 -1.42,1.01L3,12v8c0,0.55 0.45,1 1,1h1c0.55,0 1,-0.45 1,-1v-1h12v1c0,0.55 0.45,1 1,1h1c0.55,0 1,-0.45 1,-1v-8l-2.08,-5.99zM6.5,16c-0.83,0 -1.5,-0.67 -1.5,-1.5S5.67,13 6.5,13s1.5,0.67 1.5,1.5S7.33,16 6.5,16zM17.5,16c-0.83,0 -1.5,-0.67 -1.5,-1.5s0.67,-1.5 1.5,-1.5 1.5,0.67 1.5,1.5 -0.67,1.5 -1.5,1.5zM5,11l1.5,-4.5h11L19,11L5,11z" />
+</vector>

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

@@ -20,6 +20,7 @@
     <string name="auto_favorites">Favoriten</string>
     <string name="auto_fault_report_date">⚠️ Störungsmeldung (%s)</string>
     <string name="auto_no_refresh_possible">Weitere Aktualisierung nicht möglich. Bitte zurück gehen und neu starten.</string>
+    <string name="auto_vehicle_data">Fahrzeugdaten</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>
     <string name="sounds_cool">klingt cool</string>

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

@@ -30,6 +30,7 @@
     <string name="auto_favorites">Favorites</string>
     <string name="auto_fault_report_date">⚠️ Fault report (%s)</string>
     <string name="auto_no_refresh_possible">Further updates not possible. Please go back and restart.</string>
+    <string name="auto_vehicle_data">Vehicle data</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>
     <string name="sounds_cool">sounds cool</string>