feat: multi-flavor APK build from dashboards.yaml

Dashboard URL and label configured in dashboards.yaml; each entry
becomes a product flavor with BuildConfig.DASHBOARD_URL injected
at build time. APKs output as <flavor>-release.apk.

app/build.gradle.kts

@@ -1,8 +1,14 @@
+import org.yaml.snakeyaml.Yaml
+
 plugins {
     id("com.android.application")
     id("org.jetbrains.kotlin.android")
 }
 
+@Suppress("UNCHECKED_CAST")
+val dashboards: Map<String, Map<String, String>> =
+    Yaml().load(rootProject.file("dashboards.yaml").inputStream())
+
 android {
     namespace = "cz.c3c.webviewkiosk"
     compileSdk = 34
@@ -15,11 +21,12 @@ android {
         versionName = "0.1.0"
     }
 
+    buildFeatures {
+        buildConfig = true
+    }
+
     signingConfigs {
         create("release") {
-            // Keystore is committed (private repo, LAN kiosk app) so every
-            // machine/CI produces the same signature and `adb install -r`
-            // upgrades work without uninstalling. Created in Task 6.
             storeFile = rootProject.file("signing/release.keystore")
             storePassword = "android-webview-kiosk"
             keyAlias = "kiosk"
@@ -34,6 +41,28 @@ android {
         }
     }
 
+    flavorDimensions += "dashboard"
+
+    productFlavors {
+        dashboards.forEach { (name, config) ->
+            create(name) {
+                dimension = "dashboard"
+                buildConfigField("String", "DASHBOARD_URL", "\"${config["url"]}\"")
+                resValue("string", "app_name", config["label"] ?: name)
+            }
+        }
+    }
+
+    @Suppress("DEPRECATION")
+    applicationVariants.all {
+        val flavor = productFlavors.first().name
+        val type = buildType.name
+        outputs.all {
+            (this as com.android.build.gradle.internal.api.BaseVariantOutputImpl)
+                .outputFileName = "$flavor-$type.apk"
+        }
+    }
+
     compileOptions {
         sourceCompatibility = JavaVersion.VERSION_17
         targetCompatibility = JavaVersion.VERSION_17

app/src/main/AndroidManifest.xml

@@ -15,7 +15,7 @@
         android:allowBackup="false"
         android:banner="@drawable/banner"
         android:icon="@drawable/icon"
-        android:label="Grafana Kiosk"
+        android:label="@string/app_name"
         android:usesCleartextTraffic="true"
         android:theme="@android:style/Theme.NoTitleBar.Fullscreen">
 

app/src/main/java/cz/c3c/webviewkiosk/MainActivity.kt

@@ -15,11 +15,6 @@ import android.webkit.WebViewClient
 
 class MainActivity : Activity() {
 
-    companion object {
-        const val DASHBOARD_URL =
-            "https://grafana.c3c.cz/public-dashboards/381fe3e71e164eb99dd0b10e246a36e2"
-    }
-
     private lateinit var webView: WebView
     private val handler = Handler(Looper.getMainLooper())
     private val backoff = BackoffPolicy(initialDelayMs = 2_000, maxDelayMs = 60_000)
@@ -55,7 +50,7 @@ class MainActivity : Activity() {
                 if (!request.isForMainFrame) return
                 lastLoadFailed = true
                 handler.postDelayed(
-                    { view.loadUrl(DASHBOARD_URL) },
+                    { view.loadUrl(BuildConfig.DASHBOARD_URL) },
                     backoff.nextDelayMs(),
                 )
             }
@@ -63,7 +58,7 @@ class MainActivity : Activity() {
 
         setContentView(webView)
         hideSystemUi()
-        webView.loadUrl(DASHBOARD_URL)
+        webView.loadUrl(BuildConfig.DASHBOARD_URL)
     }
 
     override fun onResume() {