Added method from cgisca@71496af by

DeleteSystem32 to check if Google services are available on device.

app/src/main/java/io/cgisca/godot/gpgs/PlayGameServicesGodot.kt

@@ -2,6 +2,8 @@ package io.cgisca.godot.gpgs
 
 import android.app.Activity
 import android.content.Intent
+import com.google.android.gms.common.GoogleApiAvailability
+import com.google.android.gms.common.ConnectionResult
 import com.google.android.gms.auth.api.Auth
 import com.google.android.gms.auth.api.signin.GoogleSignIn
 import com.google.android.gms.auth.api.signin.GoogleSignInClient
@@ -89,6 +91,7 @@ class PlayGameServicesGodot(godot: Godot) : GodotPlugin(godot), AchievementsList
 
     override fun getPluginMethods(): MutableList<String> {
         return mutableListOf(
+            "isGooglePlayServicesAvailable",
             "init",
             "initWithSavedGames",
             "signIn",
@@ -167,6 +170,11 @@ class PlayGameServicesGodot(godot: Godot) : GodotPlugin(godot), AchievementsList
         }
     }
 
+    fun isGooglePlayServicesAvailable(): Boolean {
+        val result: Int = GoogleApiAvailability.getInstance().isGooglePlayServicesAvailable(godot.activity as Activity)
+        return result == ConnectionResult.SUCCESS
+    }
+
     fun init(enablePopups: Boolean, requestEmail: Boolean, requestProfile: Boolean, requestToken: String) {
         initialize(false, enablePopups, "DefaultGame", requestEmail, requestProfile, requestToken)
     }