Allow for setting of sample's default url/token through gradle properties

@@ -3,6 +3,17 @@ plugins {
     id 'kotlin-android'
 }
 
+def getDefaultUrl() {
+    return hasProperty('livekitSampleUrl') ? livekitSampleUrl : "ws://www.example.com"
+}
+
+def getDefaultToken() {
+    return hasProperty('livekitSampleToken') ? livekitSampleToken : ""
+}
+
+final url = getDefaultUrl()
+final token = getDefaultToken()
+
 android {
     compileSdk androidSdk.compileVersion
 
@@ -18,6 +29,14 @@ android {
         release {
             minifyEnabled false
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+
+            buildConfigField "String", "DEFAULT_URL", "\"$url\""
+            buildConfigField "String", "DEFAULT_TOKEN", "\"$token\""
+        }
+
+        debug {
+            buildConfigField "String", "DEFAULT_URL", "\"$url\""
+            buildConfigField "String", "DEFAULT_TOKEN", "\"$token\""
         }
     }
     compileOptions {

@@ -32,8 +32,7 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
         private const val PREFERENCES_KEY_URL = "url"
         private const val PREFERENCES_KEY_TOKEN = "token"
 
-        const val URL = "ws://www.example.com"
-        const val TOKEN =
-            ""
+        const val URL = BuildConfig.DEFAULT_URL
+        const val TOKEN = BuildConfig.DEFAULT_TOKEN
     }
 }
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