Phase 1: minimal Kotlin Android app shows Hub /health
Scaffold the Android Gradle project under android/ mirroring the proven internet_use_control toolchain: Gradle wrapper 8.11.1, AGP 8.7.3, Kotlin 2.0.21, compileSdk/targetSdk 35, Java/Kotlin 17, minSdk 29 (AGENTS.md §9). One Activity calls GET http://192.168.20.13:8788/health off the main thread and renders ok, service, version and every checks value plus the raw body. INTERNET permission and usesCleartextTraffic are declared for the LAN Hub. A failed or non-2xx call renders an explicit error line and never reports success (AGENTS.md §10 rule 4). applicationId au.audasmedia.hub.phone, versionName 0.1.0-phase1. Co-Authored-By: Paperclip <noreply@paperclip.ing>
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Paperclip
43
android/app/build.gradle.kts
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43
android/app/build.gradle.kts
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plugins {
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id("com.android.application")
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id("org.jetbrains.kotlin.android")
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}
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android {
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namespace = "au.audasmedia.hub.phone"
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compileSdk = 35
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defaultConfig {
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applicationId = "au.audasmedia.hub.phone"
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// AGENTS.md §9: API 29 (Android 10) is the suggested minimum. The app
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// targets API 35 but runs on Android 10 and up.
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minSdk = 29
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targetSdk = 35
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versionCode = 1
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versionName = "0.1.0-phase1"
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}
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buildTypes {
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release {
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isMinifyEnabled = false
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proguardFiles(
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getDefaultProguardFile("proguard-android-optimize.txt"),
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"proguard-rules.pro",
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)
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}
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}
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compileOptions {
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sourceCompatibility = JavaVersion.VERSION_17
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targetCompatibility = JavaVersion.VERSION_17
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}
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kotlinOptions {
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jvmTarget = "17"
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}
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}
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// Phase 1 keeps the dependency set empty on purpose: the health check uses
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// HttpURLConnection (JDK/Android) and org.json (Android platform). No appcompat,
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// no okhttp, no gson.
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dependencies {
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}
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1
android/app/proguard-rules.pro
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1
android/app/proguard-rules.pro
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# Phase 1 keeps no custom ProGuard rules. The release build is not minified.
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33
android/app/src/main/AndroidManifest.xml
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android/app/src/main/AndroidManifest.xml
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<?xml version="1.0" encoding="utf-8"?>
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<!--
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Kotlin Phone App — Phase 1 (AGENTS.md §11 Phase 1).
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This is the smallest possible proof that the Android build environment works
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end to end: one Activity that calls the Hub `GET /health` and shows the reply.
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INTERNET is required to reach the Hub. usesCleartextTraffic is true because
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the Hub speaks plain HTTP on the LAN and Android blocks cleartext by default
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on API 28+ (AGENTS.md §11 Phase 1, step 3).
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-->
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<manifest xmlns:android="http://schemas.android.com/apk/res/android">
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<uses-permission android:name="android.permission.INTERNET" />
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<application
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android:allowBackup="false"
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android:label="Hub Phone (Phase 1)"
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android:supportsRtl="true"
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android:theme="@android:style/Theme.Material.Light"
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android:usesCleartextTraffic="true">
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<activity
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android:name=".MainActivity"
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android:exported="true"
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android:label="Hub Phone (Phase 1)">
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="android.intent.category.LAUNCHER" />
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</intent-filter>
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</activity>
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</application>
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</manifest>
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package au.audasmedia.hub.phone
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import android.app.Activity
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import android.graphics.Color
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import android.graphics.Typeface
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import android.os.Bundle
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import android.util.TypedValue
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import android.widget.LinearLayout
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import android.widget.ScrollView
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import android.widget.TextView
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import org.json.JSONObject
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import java.net.HttpURLConnection
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import java.net.URL
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/**
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* Phase 1 proof screen.
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*
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* Calls the Hub `GET /health` off the main thread and renders the reply. A
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* failed call shows an explicit error line and never reports success
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* (AGENTS.md §10 rule 4).
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*/
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class MainActivity : Activity() {
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private lateinit var statusView: TextView
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private lateinit var resultView: TextView
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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val pad = dp(20)
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val root = LinearLayout(this).apply {
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orientation = LinearLayout.VERTICAL
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setPadding(pad, pad, pad, pad)
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setBackgroundColor(Color.parseColor("#f6f5f4"))
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}
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val title = TextView(this).apply {
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text = "Kotlin Phone App — Phase 1"
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setTextSize(TypedValue.COMPLEX_UNIT_SP, 22f)
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setTypeface(typeface, Typeface.BOLD)
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setTextColor(Color.parseColor("#171717"))
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}
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root.addView(title)
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val subtitle = TextView(this).apply {
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text = "Hub health check — no auth"
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setTextSize(TypedValue.COMPLEX_UNIT_SP, 14f)
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setTextColor(Color.parseColor("#6b6b6b"))
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setPadding(0, dp(4), 0, dp(4))
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}
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root.addView(subtitle)
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statusView = TextView(this).apply {
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setTextSize(TypedValue.COMPLEX_UNIT_SP, 16f)
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setTextColor(Color.parseColor("#0075de"))
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text = "Calling $HEALTH_URL …"
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setPadding(0, dp(12), 0, dp(12))
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}
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root.addView(statusView)
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resultView = TextView(this).apply {
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setTextSize(TypedValue.COMPLEX_UNIT_SP, 15f)
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setTextColor(Color.parseColor("#171717"))
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typeface = Typeface.MONOSPACE
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}
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root.addView(resultView)
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setContentView(ScrollView(this).apply { addView(root) })
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fetchHealth()
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}
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private fun fetchHealth() {
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Thread {
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try {
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val conn = (URL(HEALTH_URL).openConnection() as HttpURLConnection).apply {
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requestMethod = "GET"
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connectTimeout = 8000
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readTimeout = 8000
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setRequestProperty("Accept", "application/json")
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}
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val code = conn.responseCode
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val stream = if (code in 200..299) conn.inputStream else conn.errorStream
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val body = stream?.bufferedReader()?.use { it.readText() } ?: ""
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conn.disconnect()
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runOnUiThread { render(code, body) }
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} catch (e: Exception) {
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val reason = "${e.javaClass.simpleName}: ${e.message}"
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runOnUiThread { renderError(reason) }
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}
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}.start()
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}
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private fun render(code: Int, body: String) {
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if (code !in 200..299) {
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renderError("HTTP $code from $HEALTH_URL\n$body")
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return
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}
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val json = try {
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JSONObject(body)
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} catch (e: Exception) {
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renderError("Unparseable JSON from $HEALTH_URL\n$body")
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return
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}
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if (!json.optBoolean("ok", false)) {
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renderError("Hub reported ok=false\n$body")
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return
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}
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val out = StringBuilder()
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out.append("HTTP $code — HEALTHY\n\n")
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out.append("ok : ${json.optBoolean("ok")}\n")
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out.append("service : ${json.optString("service")}\n")
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out.append("version : ${json.optString("version")}\n")
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out.append("uptime_s : ${json.optLong("uptime_s")}\n")
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out.append("\nchecks:\n")
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val checks = json.optJSONObject("checks")
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if (checks != null && checks.length() > 0) {
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for (key in checks.keys()) {
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out.append(" $key : ${checks.optString(key)}\n")
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}
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} else {
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out.append(" (none)\n")
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}
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out.append("\nraw:\n$body")
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statusView.text = "Hub reachable"
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statusView.setTextColor(Color.parseColor("#1a7f37"))
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resultView.setTextColor(Color.parseColor("#171717"))
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resultView.text = out.toString()
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}
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private fun renderError(message: String) {
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statusView.text = "ERROR — Hub call failed"
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statusView.setTextColor(Color.parseColor("#c01c28"))
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resultView.setTextColor(Color.parseColor("#c01c28"))
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resultView.text = "$message\n\nURL: $HEALTH_URL"
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}
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private fun dp(value: Int): Int = TypedValue.applyDimension(
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TypedValue.COMPLEX_UNIT_DIP,
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value.toFloat(),
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resources.displayMetrics,
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).toInt()
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companion object {
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private const val HEALTH_URL = "http://192.168.20.13:8788/health"
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}
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}
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