show error dialog when Google Play Services are not available

app/src/main/java/net/vonforst/evmap/MapsActivity.kt

@@ -3,6 +3,7 @@ package net.vonforst.evmap
 import android.content.Intent
 import android.net.Uri
 import android.os.Bundle
+import android.util.Log
 import android.view.View
 import androidx.appcompat.app.AppCompatActivity
 import androidx.browser.customtabs.CustomTabsIntent
@@ -12,11 +13,14 @@ import androidx.navigation.NavController
 import androidx.navigation.findNavController
 import androidx.navigation.ui.AppBarConfiguration
 import androidx.navigation.ui.setupWithNavController
+import com.google.android.gms.common.ConnectionResult
+import com.google.android.gms.common.GoogleApiAvailability
 import com.google.android.material.navigation.NavigationView
 import com.google.android.material.snackbar.Snackbar
 import net.vonforst.evmap.api.goingelectric.ChargeLocation
 import net.vonforst.evmap.storage.PreferenceDataSource
 
+
 const val REQUEST_LOCATION_PERMISSION = 1
 
 class MapsActivity : AppCompatActivity() {
@@ -47,6 +51,8 @@ class MapsActivity : AppCompatActivity() {
         findViewById<NavigationView>(R.id.nav_view).setupWithNavController(navController)
 
         prefs = PreferenceDataSource(this)
+
+        checkPlayServices()
     }
 
     fun navigateTo(charger: ChargeLocation) {
@@ -92,4 +98,19 @@ class MapsActivity : AppCompatActivity() {
         }
         startActivity(intent)
     }
+
+    private fun checkPlayServices(): Boolean {
+        val request = 9000
+        val apiAvailability = GoogleApiAvailability.getInstance()
+        val resultCode = apiAvailability.isGooglePlayServicesAvailable(this)
+        if (resultCode != ConnectionResult.SUCCESS) {
+            if (apiAvailability.isUserResolvableError(resultCode)) {
+                apiAvailability.getErrorDialog(this, resultCode, request).show()
+            } else {
+                Log.d("EVMap", "This device is not supported.")
+            }
+            return false
+        }
+        return true
+    }
 }