Fix unknown property error when syncing Gradle

When opening project for the first time Android Gradle might create default 'local.properties' file. Gradle will attempt to read multiple properties once it detects that this file exists but will fail to find them later.

Author: gugalo

app/build.gradle

@@ -35,23 +35,24 @@ android {
         Properties p = new Properties()
         new FileInputStream(propsFile).withCloseable { is -> p.load(is) }
         p.each { name, value -> ext[name] = value }
-    } else {
-        ext["GLIA_API_KEY_SECRET"] = System.getenv("GLIA_API_KEY_SECRET") as String
-        ext["GLIA_API_KEY_ID"] = System.getenv("GLIA_API_KEY_ID") as String
-        ext["GLIA_SITE_ID"] = System.getenv("GLIA_SITE_ID") as String
-        ext["FIREBASE_PROJECT_ID"] = System.getenv("FIREBASE_PROJECT_ID") as String
-        ext["FIREBASE_API_KEY"] = System.getenv("FIREBASE_API_KEY") as String
-        ext["FIREBASE_APP_ID"] = System.getenv("FIREBASE_APP_ID") as String
-        ext["FIREBASE_APP_ID_DEBUG"] = System.getenv("FIREBASE_APP_ID_DEBUG") as String
-        ext["FIREBASE_APP_ID_MASTER"] = System.getenv("FIREBASE_APP_ID_MASTER") as String
     }
+
+    initEnvProperty('GLIA_API_KEY_SECRET')
+    initEnvProperty('GLIA_API_KEY_ID')
+    initEnvProperty('GLIA_SITE_ID')
+    initEnvProperty('FIREBASE_PROJECT_ID')
+    initEnvProperty('FIREBASE_API_KEY')
+    initEnvProperty('FIREBASE_APP_ID')
+    initEnvProperty('FIREBASE_APP_ID_DEBUG')
+    initEnvProperty('FIREBASE_APP_ID_MASTER')
+
     buildTypes {
         all {
-            resValue("string", "site_id", GLIA_SITE_ID ?: "")
-            resValue("string", "glia_api_key_id", GLIA_API_KEY_ID ?: "")
-            resValue("string", "glia_api_key_secret", GLIA_API_KEY_SECRET ?: "")
-            resValue("string", "firebase_proj_id", FIREBASE_PROJECT_ID ?: "")
-            resValue("string", "firebase_api_key", FIREBASE_API_KEY ?: "")
+            resValue("string", "site_id", GLIA_SITE_ID)
+            resValue("string", "glia_api_key_id", GLIA_API_KEY_ID)
+            resValue("string", "glia_api_key_secret", GLIA_API_KEY_SECRET)
+            resValue("string", "firebase_proj_id", FIREBASE_PROJECT_ID)
+            resValue("string", "firebase_api_key", FIREBASE_API_KEY)
         }
         debug {
             signingConfig signingConfigs.debug
@@ -83,6 +84,12 @@ android {
     namespace 'com.glia.exampleapp'
 }
 
+def initEnvProperty(String propertyName) {
+    if (!project.hasProperty(propertyName)) {
+        ext[propertyName] = System.getenv(propertyName) as String ?: "UNDEFINED"
+    }
+}
+
 dependencies {
     implementation "androidx.appcompat:appcompat:$appCompatVersion"
     implementation "com.google.android.material:material:$materialVersion"