feat: add Android client with service integration, UI, and build configuration

android/.gitignore

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+.gradle/
+local.properties
+build/
+app/build/

android/app/build.gradle

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+plugins {
+    id 'com.android.application'
+    id 'org.jetbrains.kotlin.android'
+}
+
+android {
+    namespace 'com.thefeed.android'
+    compileSdk 35
+
+    defaultConfig {
+        applicationId 'com.thefeed.android'
+        minSdk 26
+        targetSdk 35
+        versionCode 1
+        versionName '1.0.0'
+
+        testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_17
+        targetCompatibility JavaVersion.VERSION_17
+    }
+
+    kotlinOptions {
+        jvmTarget = '17'
+    }
+}
+
+dependencies {
+    implementation 'androidx.core:core-ktx:1.15.0'
+    implementation 'androidx.appcompat:appcompat:1.7.0'
+    implementation 'com.google.android.material:material:1.12.0'
+    implementation 'androidx.activity:activity-ktx:1.10.1'
+}

android/app/proguard-rules.pro

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+# Intentionally minimal. The app mostly wraps a local process and WebView.

android/app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+
+    <application
+        android:allowBackup="true"
+        android:icon="@android:drawable/sym_def_app_icon"
+        android:label="@string/app_name"
+        android:roundIcon="@android:drawable/sym_def_app_icon"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.Thefeed">
+
+        <service
+            android:name=".ThefeedService"
+            android:enabled="true"
+            android:exported="false"
+            android:foregroundServiceType="dataSync" />
+
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:launchMode="singleTask">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

android/app/src/main/assets/README.txt

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+Place the Android client binary in this folder before building:
+
+Filename required:
+- thefeed-client
+
+How to produce it from project root:
+- make build-android-arm64
+- cp build/thefeed-client-android-arm64 android/app/src/main/assets/thefeed-client
+
+The app copies this file to internal storage, marks it executable, and runs it as:
+- --data-dir <app files dir>/thefeeddata
+- --port 8080

android/app/src/main/java/com/thefeed/android/MainActivity.kt

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+package com.thefeed.android
+
+import android.content.Intent
+import android.os.Build
+import android.os.Bundle
+import android.webkit.WebSettings
+import android.webkit.WebView
+import android.webkit.WebViewClient
+import android.widget.Button
+import android.widget.TextView
+import androidx.activity.ComponentActivity
+
+class MainActivity : ComponentActivity() {
+    private lateinit var webView: WebView
+    private lateinit var txtStatus: TextView
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+
+        webView = findViewById(R.id.webView)
+        txtStatus = findViewById(R.id.txtStatus)
+
+        findViewById<Button>(R.id.btnStart).setOnClickListener {
+            startThefeedService()
+            txtStatus.text = "Service started. Opening local UI..."
+            loadLocalWeb()
+        }
+
+        findViewById<Button>(R.id.btnStop).setOnClickListener {
+            stopService(Intent(this, ThefeedService::class.java))
+            txtStatus.text = "Service stopped"
+        }
+
+        findViewById<Button>(R.id.btnReload).setOnClickListener {
+            loadLocalWeb()
+        }
+
+        configureWebView()
+
+        // Start in background by default so WebView can connect on first launch.
+        startThefeedService()
+        loadLocalWeb()
+    }
+
+    private fun startThefeedService() {
+        val intent = Intent(this, ThefeedService::class.java)
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            startForegroundService(intent)
+        } else {
+            startService(intent)
+        }
+    }
+
+    private fun configureWebView() {
+        webView.webViewClient = object : WebViewClient() {
+            override fun onPageFinished(view: WebView?, url: String?) {
+                txtStatus.text = "Connected to local UI"
+            }
+        }
+
+        with(webView.settings) {
+            javaScriptEnabled = true
+            domStorageEnabled = true
+            cacheMode = WebSettings.LOAD_DEFAULT
+            allowFileAccess = false
+            allowContentAccess = false
+        }
+    }
+
+    private fun loadLocalWeb() {
+        txtStatus.text = "Loading http://127.0.0.1:8080 ..."
+        webView.postDelayed({ webView.loadUrl("http://127.0.0.1:8080") }, 500)
+    }
+
+    override fun onDestroy() {
+        webView.destroy()
+        super.onDestroy()
+    }
+}

android/app/src/main/java/com/thefeed/android/ThefeedService.kt

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+package com.thefeed.android
+
+import android.app.Notification
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.app.Service
+import android.content.Intent
+import android.os.Build
+import android.os.IBinder
+import androidx.core.app.NotificationCompat
+import java.io.File
+import java.io.FileOutputStream
+
+class ThefeedService : Service() {
+    private var process: Process? = null
+
+    override fun onCreate() {
+        super.onCreate()
+        createNotificationChannel()
+        startForeground(NOTIFICATION_ID, buildNotification("Starting local service..."))
+        startClientProcess()
+    }
+
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        return START_STICKY
+    }
+
+    override fun onDestroy() {
+        process?.destroy()
+        process = null
+        super.onDestroy()
+    }
+
+    override fun onBind(intent: Intent?): IBinder? = null
+
+    private fun startClientProcess() {
+        try {
+            val bin = ensureBinary()
+            val dataDir = File(filesDir, "thefeeddata")
+            if (!dataDir.exists()) {
+                dataDir.mkdirs()
+            }
+
+            val pb = ProcessBuilder(
+                bin.absolutePath,
+                "--data-dir", dataDir.absolutePath,
+                "--port", "8080"
+            )
+            pb.redirectErrorStream(true)
+            process = pb.start()
+
+            val outputReader = process?.inputStream?.bufferedReader()
+            Thread {
+                try {
+                    while (true) {
+                        val line = outputReader?.readLine() ?: break
+                        updateForegroundNotification(line)
+                    }
+                } catch (_: Exception) {
+                }
+            }.start()
+
+            updateForegroundNotification("Running on http://127.0.0.1:8080")
+        } catch (e: Exception) {
+            updateForegroundNotification("Failed: ${e.message}")
+            stopSelf()
+        }
+    }
+
+    private fun ensureBinary(): File {
+        val target = File(filesDir, "thefeed-client")
+        if (target.exists() && target.length() > 0L && target.canExecute()) {
+            return target
+        }
+
+        assets.open("thefeed-client").use { input ->
+            FileOutputStream(target).use { out ->
+                input.copyTo(out)
+            }
+        }
+
+        if (!target.setExecutable(true, true)) {
+            throw IllegalStateException("Could not set executable bit on bundled binary")
+        }
+
+        return target
+    }
+
+    private fun createNotificationChannel() {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            val channel = NotificationChannel(
+                CHANNEL_ID,
+                "thefeed background service",
+                NotificationManager.IMPORTANCE_LOW
+            )
+            val manager = getSystemService(NotificationManager::class.java)
+            manager.createNotificationChannel(channel)
+        }
+    }
+
+    private fun buildNotification(message: String): Notification {
+        return NotificationCompat.Builder(this, CHANNEL_ID)
+            .setContentTitle("thefeed")
+            .setContentText(message)
+            .setSmallIcon(android.R.drawable.stat_notify_sync)
+            .setOngoing(true)
+            .build()
+    }
+
+    private fun updateForegroundNotification(message: String) {
+        val manager = getSystemService(NotificationManager::class.java)
+        manager.notify(NOTIFICATION_ID, buildNotification(message))
+    }
+
+    companion object {
+        private const val CHANNEL_ID = "thefeed_service"
+        private const val NOTIFICATION_ID = 1201
+    }
+}

android/app/src/main/res/layout/activity_main.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:background="@color/bg">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal"
+        android:padding="10dp"
+        android:gravity="center_vertical"
+        android:background="@color/bgPanel">
+
+        <Button
+            android:id="@+id/btnStart"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:text="@string/start_service" />
+
+        <Button
+            android:id="@+id/btnStop"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:layout_marginStart="8dp"
+            android:text="@string/stop_service" />
+
+        <Button
+            android:id="@+id/btnReload"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:layout_marginStart="8dp"
+            android:text="@string/reload_webview" />
+    </LinearLayout>
+
+    <TextView
+        android:id="@+id/txtStatus"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:padding="10dp"
+        android:textColor="@color/text"
+        android:text="@string/webview_loading" />
+
+    <WebView
+        android:id="@+id/webView"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_weight="1" />
+
+</LinearLayout>

android/app/src/main/res/values/colors.xml

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+<resources>
+    <color name="bg">#0B1020</color>
+    <color name="bgPanel">#132247</color>
+    <color name="accent">#F59E0B</color>
+    <color name="text">#EDF2FF</color>
+</resources>

android/app/src/main/res/values/strings.xml

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+<resources>
+    <string name="app_name">thefeed</string>
+    <string name="webview_loading">Loading local web UI...</string>
+    <string name="start_service">Start</string>
+    <string name="stop_service">Stop</string>
+    <string name="reload_webview">Reload</string>
+</resources>

android/app/src/main/res/values/themes.xml

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+<resources xmlns:tools="http://schemas.android.com/tools">
+    <style name="Theme.Thefeed" parent="Theme.MaterialComponents.DayNight.NoActionBar">
+        <item name="colorPrimary">@color/bgPanel</item>
+        <item name="colorPrimaryVariant">@color/bgPanel</item>
+        <item name="colorOnPrimary">@color/text</item>
+        <item name="android:statusBarColor" tools:targetApi="l">@color/bg</item>
+    </style>
+</resources>

android/build.gradle

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+plugins {
+    id 'com.android.application' version '8.7.3' apply false
+    id 'org.jetbrains.kotlin.android' version '2.0.21' apply false
+}

android/gradle.properties

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+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+android.useAndroidX=true
+kotlin.code.style=official

android/settings.gradle

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+pluginManagement {
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+
+dependencyResolutionManagement {
+    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+rootProject.name = "thefeed-android"
+include ':app'