Fix android backend url

android/app/build.gradle.kts

@@ -1,7 +1,23 @@
+import java.util.Properties
+
 plugins {
     alias(libs.plugins.android.application)
 }
 
+val localProperties = Properties().apply {
+    val file = rootProject.file("local.properties")
+    if (file.exists()) {
+        file.inputStream().use { load(it) }
+    }
+}
+
+fun quoted(value: String): String = "\"$value\""
+
+val emulatorBackendUrl =
+    (localProperties.getProperty("petstore.backend.emulatorUrl") ?: "http://10.0.2.2:8080/").trim()
+val deviceBackendUrl =
+    (localProperties.getProperty("petstore.backend.deviceUrl") ?: "http://10.0.0.200:8080/").trim()
+
 android {
     namespace = "com.example.petstoremobile"
     compileSdk = 36
@@ -14,6 +30,13 @@ android {
         versionName = "1.0"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+
+        buildConfigField("String", "EMULATOR_BACKEND_URL", quoted(emulatorBackendUrl))
+        buildConfigField("String", "DEVICE_BACKEND_URL", quoted(deviceBackendUrl))
+    }
+
+    buildFeatures {
+        buildConfig = true
     }
 
     buildTypes {
@@ -62,4 +85,4 @@ dependencies {
     testImplementation(libs.junit)
     androidTestImplementation(libs.ext.junit)
     androidTestImplementation(libs.espresso.core)
-}
+}