ci: sign release bundle in GitHub Actions

Decode the upload keystore from the RELEASE_KEYSTORE_BASE64 secret and pass
the MYAPP_RELEASE_* signing properties to Gradle via ORG_GRADLE_PROJECT_*
env vars, so tagged releases produce a signed .aab. Fail fast if the keystore
secret is missing, and verify the bundle signature after the build.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.github/workflows/release.yml

@@ -42,9 +42,33 @@ jobs:
       - name: Build debug APK
         run: ./scripts/build-debug.sh assembleDebug lint
 
+      - name: Decode release keystore
+        env:
+          RELEASE_KEYSTORE_BASE64: ${{ secrets.RELEASE_KEYSTORE_BASE64 }}
+        run: |
+          if [ -z "$RELEASE_KEYSTORE_BASE64" ]; then
+            echo "::error::RELEASE_KEYSTORE_BASE64 secret is not set; cannot sign the release."
+            exit 1
+          fi
+          echo "$RELEASE_KEYSTORE_BASE64" | base64 -d > "$RUNNER_TEMP/release.keystore"
+
       - name: Build release bundle
+        env:
+          ORG_GRADLE_PROJECT_MYAPP_RELEASE_STORE_FILE: ${{ runner.temp }}/release.keystore
+          ORG_GRADLE_PROJECT_MYAPP_RELEASE_STORE_PASSWORD: ${{ secrets.RELEASE_STORE_PASSWORD }}
+          ORG_GRADLE_PROJECT_MYAPP_RELEASE_KEY_ALIAS: ${{ secrets.RELEASE_KEY_ALIAS }}
+          ORG_GRADLE_PROJECT_MYAPP_RELEASE_KEY_PASSWORD: ${{ secrets.RELEASE_KEY_PASSWORD }}
         run: ./scripts/build-release.sh bundleRelease lintRelease
 
+      - name: Verify the release bundle is signed
+        run: |
+          if jarsigner -verify "app/build/outputs/bundle/release/app-release.aab" | grep -q "jar verified"; then
+            echo "Release bundle is signed."
+          else
+            echo "::error::Release bundle is NOT signed."
+            exit 1
+          fi
+
       - name: Prepare release assets
         run: |
           mkdir -p dist

README.md

@@ -19,6 +19,7 @@ https://buymeacoffee.com/relaytv
 - Health verification before saving a server
 - LAN auto-discovery of `_relaytv._tcp` servers using Android NSD / mDNS
 - Embedded RelayTV `/ui` WebView access
+- System media controls (lock screen / quick settings) mirroring playback on the active server
 - Reconnect and heartbeat recovery
 - Dedicated Android share targets:
   - `RelayTV Queue` → `POST /smart`

app/build.gradle

@@ -11,8 +11,22 @@ android {
         applicationId = "pro.relaytv"
         minSdk = 26
         targetSdk = 35
-        versionCode = 5
+        versionCode = 6
-        versionName = "1.2.3"
+        versionName = "1.3.0"
+    }
+
+    // Release signing is configured via gradle.properties (see todo.md /
+    // docs/RELEASE_CHECKLIST.md); without those properties the release
+    // build stays unsigned so CI and local debug workflows keep working.
+    signingConfigs {
+        release {
+            if (project.hasProperty("MYAPP_RELEASE_STORE_FILE")) {
+                storeFile = file(MYAPP_RELEASE_STORE_FILE)
+                storePassword = MYAPP_RELEASE_STORE_PASSWORD
+                keyAlias = MYAPP_RELEASE_KEY_ALIAS
+                keyPassword = MYAPP_RELEASE_KEY_PASSWORD
+            }
+        }
     }
 
     buildTypes {
@@ -23,6 +37,9 @@ android {
                 getDefaultProguardFile("proguard-android-optimize.txt"),
                 "proguard-rules.pro"
             )
+            if (project.hasProperty("MYAPP_RELEASE_STORE_FILE")) {
+                signingConfig = signingConfigs.release
+            }
         }
         debug {
             minifyEnabled = false
@@ -46,4 +63,5 @@ dependencies {
 
     implementation "com.squareup.okhttp3:okhttp:4.12.0"
     implementation "androidx.work:work-runtime-ktx:2.9.1"
+    implementation "androidx.media3:media3-session:1.7.1"
 }

app/src/main/AndroidManifest.xml

@@ -1,9 +1,12 @@
-<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
 
     <uses-permission android:name="android.permission.INTERNET"/>
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
     <uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE"/>
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_MEDIA_PLAYBACK"/>
 
     <application
         android:allowBackup="false"
@@ -91,6 +94,18 @@
             android:name=".SettingsActivity"
             android:exported="false"
             android:theme="@style/Theme.RelayTV.NoActionBar"/>
+
+        <!-- Must be exported so system media controllers can bind; media3
+             gates access itself via MediaSession's connection callbacks. -->
+        <service
+            android:name=".MediaControlService"
+            android:exported="true"
+            android:foregroundServiceType="mediaPlayback"
+            tools:ignore="ExportedService">
+            <intent-filter>
+                <action android:name="androidx.media3.session.MediaSessionService"/>
+            </intent-filter>
+        </service>
     </application>
 
 </manifest>

app/src/main/java/pro/relaytv/AppSettings.kt

@@ -0,0 +1,18 @@
+package pro.relaytv
+
+import android.content.Context
+
+/** App-level feature settings (separate from the server list in [HostStore]). */
+object AppSettings {
+    private const val PREF = "relaytv_prefs"
+    private const val KEY_MEDIA_CONTROLS = "media_controls_enabled"
+
+    private fun prefs(ctx: Context) = ctx.getSharedPreferences(PREF, Context.MODE_PRIVATE)
+
+    fun isMediaControlsEnabled(ctx: Context): Boolean =
+        prefs(ctx).getBoolean(KEY_MEDIA_CONTROLS, true)
+
+    fun setMediaControlsEnabled(ctx: Context, enabled: Boolean) {
+        prefs(ctx).edit().putBoolean(KEY_MEDIA_CONTROLS, enabled).apply()
+    }
+}

app/src/main/java/pro/relaytv/MainActivity.kt

@@ -127,6 +127,10 @@ class MainActivity : AppCompatActivity() {
                     loadActiveServer(forcePickerOnFailure = false, manualRefresh = true)
                     true
                 }
+                R.id.action_settings -> {
+                    startActivity(Intent(this, SettingsActivity::class.java))
+                    true
+                }
                 R.id.action_privacy -> {
                     openPrivacyPolicy()
                     true
@@ -184,6 +188,14 @@ class MainActivity : AppCompatActivity() {
         loadServerBase(base.trimEnd('/'), forcePickerOnFailure = true, manualRefresh = false)
     }
 
+    override fun onNewIntent(intent: Intent) {
+        super.onNewIntent(intent)
+        setIntent(intent)
+        if (intent.getBooleanExtra("open_servers", false)) {
+            showServerPicker()
+        }
+    }
+
     private fun buildFileChooserIntent(fileChooserParams: WebChromeClient.FileChooserParams): Intent {
         val acceptTypes = fileChooserParams.acceptTypes
             .orEmpty()
@@ -263,11 +275,19 @@ class MainActivity : AppCompatActivity() {
         super.onResume()
         isInForeground = true
         registerNetworkCallback()
+        ensureMediaControlService()
         if (!activeBaseUrl.isNullOrBlank()) {
             scheduleHeartbeat(2_000)
         }
     }
 
+    @androidx.annotation.OptIn(androidx.media3.common.util.UnstableApi::class)
+    private fun ensureMediaControlService() {
+        if (!AppSettings.isMediaControlsEnabled(this)) return
+        if (HostStore.getActiveBaseUrl(this).isNullOrBlank()) return
+        runCatching { startService(Intent(this, MediaControlService::class.java)) }
+    }
+
     override fun onPause() {
         super.onPause()
         isInForeground = false
@@ -341,6 +361,8 @@ class MainActivity : AppCompatActivity() {
                     }
                     val recovered = consecutiveHealthFailures > 0
                     consecutiveHealthFailures = 0
+                    // Keep the media-controls service alive while we can see the server.
+                    ensureMediaControlService()
                     if (recovered && !manualRefresh) {
                         Toast.makeText(this@MainActivity, "Reconnected to RelayTV.", Toast.LENGTH_SHORT).show()
                     }

app/src/main/java/pro/relaytv/MediaControlService.kt

@@ -0,0 +1,221 @@
+package pro.relaytv
+
+import android.app.PendingIntent
+import android.content.Intent
+import android.os.Handler
+import android.os.Looper
+import android.os.SystemClock
+import androidx.media3.common.util.UnstableApi
+import androidx.media3.session.MediaSession
+import androidx.media3.session.MediaSessionService
+import okhttp3.Call
+import okhttp3.Callback
+import okhttp3.Response
+import java.io.IOException
+
+/**
+ * Publishes a MediaSession that mirrors playback on the active RelayTV server,
+ * giving lock screen / quick settings media controls for the TV. All transport
+ * actions are forwarded to the server's HTTP API; nothing plays locally.
+ *
+ * The service polls GET /status while running and stops itself after the
+ * server has been idle for a while (MainActivity restarts it while the app
+ * is in the foreground).
+ */
+@UnstableApi
+class MediaControlService : MediaSessionService() {
+
+    private val handler = Handler(Looper.getMainLooper())
+    private var player: RelayRemotePlayer? = null
+    private var session: MediaSession? = null
+
+    private var lastActiveAt = SystemClock.elapsedRealtime()
+    private var artworkUrl: String? = null
+    private var artworkBytes: ByteArray? = null
+
+    private val pollRunnable = Runnable { poll() }
+
+    companion object {
+        private const val POLL_PLAYING_MS = 3_000L
+        private const val POLL_PAUSED_MS = 5_000L
+        private const val POLL_IDLE_MS = 10_000L
+        private const val POLL_AFTER_COMMAND_MS = 700L
+        private const val IDLE_STOP_MS = 5 * 60_000L
+        private const val MAX_ARTWORK_BYTES = 3L * 1024 * 1024
+    }
+
+    private val playerListener = object : RelayRemotePlayer.Listener {
+        override fun onSetPaused(paused: Boolean) = post(if (paused) "/pause" else "/resume")
+        override fun onNext() = post("/next")
+        override fun onPrevious() = post("/previous")
+        override fun onSeekTo(seconds: Double) = post("/seek_abs", """{"sec":$seconds}""")
+        override fun onStop() = post("/stop")
+        override fun onSetVolume(percent: Int) = post("/volume", """{"set":$percent}""")
+    }
+
+    override fun onCreate() {
+        super.onCreate()
+        val player = RelayRemotePlayer(Looper.getMainLooper(), playerListener)
+        this.player = player
+
+        val sessionActivity = PendingIntent.getActivity(
+            this,
+            0,
+            Intent(this, MainActivity::class.java),
+            PendingIntent.FLAG_IMMUTABLE or PendingIntent.FLAG_UPDATE_CURRENT
+        )
+        val session = MediaSession.Builder(this, player)
+            .setSessionActivity(sessionActivity)
+            .build()
+        this.session = session
+        // Nothing external binds to this service (playback starts on the server),
+        // so the session must be registered explicitly for the media notification
+        // manager to track it.
+        addSession(session)
+
+        schedulePoll(0)
+    }
+
+    override fun onGetSession(controllerInfo: MediaSession.ControllerInfo): MediaSession? = session
+
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        super.onStartCommand(intent, flags, startId)
+        if (!AppSettings.isMediaControlsEnabled(this)) {
+            stopSelf()
+            return START_NOT_STICKY
+        }
+        // Keep the idle timer fresh while the app keeps nudging us.
+        lastActiveAt = SystemClock.elapsedRealtime()
+        schedulePoll(0)
+        return START_NOT_STICKY
+    }
+
+    override fun onDestroy() {
+        handler.removeCallbacksAndMessages(null)
+        session?.let {
+            removeSession(it)
+            it.release()
+        }
+        session = null
+        player?.release()
+        player = null
+        super.onDestroy()
+    }
+
+    private fun activeBase(): String? = HostStore.getActiveBaseUrl(this)?.trimEnd('/')
+
+    private fun schedulePoll(delayMs: Long) {
+        handler.removeCallbacks(pollRunnable)
+        handler.postDelayed(pollRunnable, delayMs)
+    }
+
+    private fun poll() {
+        if (!AppSettings.isMediaControlsEnabled(this)) {
+            stopSelf()
+            return
+        }
+        val base = activeBase()
+        if (base.isNullOrBlank()) {
+            applyStatus(RemoteStatus.IDLE, "RelayTV", base = null)
+            return
+        }
+        Net.client.newCall(Net.get("$base/status")).enqueue(object : Callback {
+            override fun onFailure(call: Call, e: IOException) {
+                handler.post { applyStatus(RemoteStatus.IDLE, serverName(), base) }
+            }
+
+            override fun onResponse(call: Call, response: Response) {
+                val status = response.use { resp ->
+                    if (!resp.isSuccessful) {
+                        RemoteStatus.IDLE
+                    } else {
+                        RemoteStatus.parse(resp.body?.string().orEmpty())
+                    }
+                }
+                handler.post { applyStatus(status, serverName(), base) }
+            }
+        })
+    }
+
+    private fun serverName(): String =
+        HostStore.getActiveHost(this)?.name?.ifBlank { "RelayTV" } ?: "RelayTV"
+
+    private fun applyStatus(status: RemoteStatus, serverName: String, base: String?) {
+        val player = player ?: return
+
+        if (status.active) {
+            lastActiveAt = SystemClock.elapsedRealtime()
+        } else if (SystemClock.elapsedRealtime() - lastActiveAt > IDLE_STOP_MS) {
+            player.updateStatus(RemoteStatus.IDLE, serverName, null)
+            stopSelf()
+            return
+        }
+
+        ensureArtwork(base, status.thumbnail)
+        player.updateStatus(status, serverName, artworkBytes)
+
+        val delay = when {
+            status.playing && !status.paused -> POLL_PLAYING_MS
+            status.active -> POLL_PAUSED_MS
+            else -> POLL_IDLE_MS
+        }
+        schedulePoll(delay)
+    }
+
+    /** Resolve the thumbnail to an absolute URL and fetch it once per URL change. */
+    private fun ensureArtwork(base: String?, thumbnail: String?) {
+        val absolute = when {
+            thumbnail.isNullOrBlank() -> null
+            thumbnail.startsWith("http://") || thumbnail.startsWith("https://") -> thumbnail
+            base.isNullOrBlank() -> null
+            thumbnail.startsWith("/") -> base + thumbnail
+            else -> "$base/$thumbnail"
+        }
+        if (absolute == artworkUrl) return
+        artworkUrl = absolute
+        artworkBytes = null
+        if (absolute == null) return
+
+        Net.client.newCall(Net.get(absolute)).enqueue(object : Callback {
+            override fun onFailure(call: Call, e: IOException) { /* no artwork */ }
+
+            override fun onResponse(call: Call, response: Response) {
+                val bytes = response.use { resp ->
+                    val body = resp.body
+                    if (!resp.isSuccessful || body == null || body.contentLength() > MAX_ARTWORK_BYTES) {
+                        null
+                    } else {
+                        try {
+                            body.bytes().takeIf { it.isNotEmpty() && it.size <= MAX_ARTWORK_BYTES }
+                        } catch (_: Exception) {
+                            null
+                        }
+                    }
+                }
+                if (bytes != null) {
+                    handler.post {
+                        if (artworkUrl == absolute) {
+                            artworkBytes = bytes
+                            // Re-render the notification with artwork right away.
+                            schedulePoll(0)
+                        }
+                    }
+                }
+            }
+        })
+    }
+
+    private fun post(path: String, json: String = "{}") {
+        val base = activeBase() ?: return
+        Net.client.newCall(Net.postJson(base + path, json)).enqueue(object : Callback {
+            override fun onFailure(call: Call, e: IOException) {
+                handler.post { schedulePoll(POLL_AFTER_COMMAND_MS) }
+            }
+
+            override fun onResponse(call: Call, response: Response) {
+                response.close()
+                handler.post { schedulePoll(POLL_AFTER_COMMAND_MS) }
+            }
+        })
+    }
+}

app/src/main/java/pro/relaytv/RelayRemotePlayer.kt

@@ -0,0 +1,203 @@
+package pro.relaytv
+
+import android.os.Looper
+import android.os.SystemClock
+import androidx.media3.common.C
+import androidx.media3.common.DeviceInfo
+import androidx.media3.common.MediaItem
+import androidx.media3.common.MediaMetadata
+import androidx.media3.common.Player
+import androidx.media3.common.SimpleBasePlayer
+import androidx.media3.common.util.UnstableApi
+import com.google.common.util.concurrent.Futures
+import com.google.common.util.concurrent.ListenableFuture
+
+/**
+ * A [SimpleBasePlayer] that mirrors playback happening on the RelayTV server.
+ * It never plays audio locally: state comes from polling /status and every
+ * transport control is forwarded to the server over HTTP via [Listener].
+ */
+@UnstableApi
+class RelayRemotePlayer(
+    looper: Looper,
+    private val listener: Listener,
+) : SimpleBasePlayer(looper) {
+
+    interface Listener {
+        fun onSetPaused(paused: Boolean)
+        fun onNext()
+        fun onPrevious()
+        fun onSeekTo(seconds: Double)
+        fun onStop()
+        fun onSetVolume(percent: Int)
+    }
+
+    private var status: RemoteStatus = RemoteStatus.IDLE
+    private var serverName: String = "RelayTV"
+    private var artworkBytes: ByteArray? = null
+
+    // Anchor for extrapolating the playback position between polls.
+    private var anchorPositionMs: Long = 0
+    private var anchorElapsedRealtime: Long = SystemClock.elapsedRealtime()
+
+    /** Must be called on the application looper. */
+    fun updateStatus(newStatus: RemoteStatus, newServerName: String, artwork: ByteArray?) {
+        status = newStatus
+        serverName = newServerName
+        artworkBytes = artwork
+        setPositionAnchor((newStatus.positionSec ?: 0.0) * 1000.0)
+        invalidateState()
+    }
+
+    fun isActive(): Boolean = status.active
+
+    private fun setPositionAnchor(positionMs: Double) {
+        anchorPositionMs = positionMs.toLong().coerceAtLeast(0)
+        anchorElapsedRealtime = SystemClock.elapsedRealtime()
+    }
+
+    private fun extrapolatedPositionMs(): Long {
+        var pos = anchorPositionMs
+        if (status.playing && !status.paused) {
+            pos += SystemClock.elapsedRealtime() - anchorElapsedRealtime
+        }
+        val durationMs = status.durationSec?.let { (it * 1000).toLong() }
+        if (durationMs != null && durationMs > 0) {
+            pos = pos.coerceAtMost(durationMs)
+        }
+        return pos.coerceAtLeast(0)
+    }
+
+    override fun getState(): State {
+        val s = status
+        if (!s.active) {
+            return State.Builder()
+                .setAvailableCommands(Player.Commands.EMPTY)
+                .setPlaybackState(Player.STATE_IDLE)
+                .build()
+        }
+
+        val durationUs = s.durationSec
+            ?.takeIf { it > 0 }
+            ?.let { (it * C.MICROS_PER_SECOND).toLong() }
+            ?: C.TIME_UNSET
+        val seekable = durationUs != C.TIME_UNSET
+
+        val metadata = MediaMetadata.Builder()
+            .setTitle(s.title ?: "Playing on $serverName")
+            .setArtist(serverName)
+            .apply {
+                artworkBytes?.let { setArtworkData(it, MediaMetadata.PICTURE_TYPE_FRONT_COVER) }
+            }
+            .build()
+
+        // Placeholder neighbours let controllers issue next/previous, which we
+        // forward to the server's queue instead of a local playlist.
+        val previousItem = MediaItemData.Builder("previous")
+            .setMediaItem(MediaItem.Builder().setMediaId("previous").build())
+            .build()
+        val currentItem = MediaItemData.Builder("current")
+            .setMediaItem(
+                MediaItem.Builder()
+                    .setMediaId("current")
+                    .setMediaMetadata(metadata)
+                    .build()
+            )
+            .setDurationUs(durationUs)
+            .setIsSeekable(seekable)
+            .build()
+        val nextItem = MediaItemData.Builder("next")
+            .setMediaItem(MediaItem.Builder().setMediaId("next").build())
+            .build()
+
+        val commands = Player.Commands.Builder()
+            .addAll(
+                Player.COMMAND_PLAY_PAUSE,
+                Player.COMMAND_STOP,
+                Player.COMMAND_SEEK_TO_NEXT,
+                Player.COMMAND_SEEK_TO_NEXT_MEDIA_ITEM,
+                Player.COMMAND_SEEK_TO_PREVIOUS,
+                Player.COMMAND_SEEK_TO_PREVIOUS_MEDIA_ITEM,
+                Player.COMMAND_GET_CURRENT_MEDIA_ITEM,
+                Player.COMMAND_GET_TIMELINE,
+                Player.COMMAND_GET_METADATA,
+            )
+            .addIf(Player.COMMAND_SEEK_IN_CURRENT_MEDIA_ITEM, seekable)
+            .addIf(Player.COMMAND_SEEK_BACK, seekable)
+            .addIf(Player.COMMAND_SEEK_FORWARD, seekable)
+            .addIf(Player.COMMAND_GET_DEVICE_VOLUME, s.volumePercent != null)
+            .addIf(Player.COMMAND_SET_DEVICE_VOLUME_WITH_FLAGS, s.volumePercent != null)
+            .addIf(Player.COMMAND_ADJUST_DEVICE_VOLUME_WITH_FLAGS, s.volumePercent != null)
+            .build()
+
+        val builder = State.Builder()
+            .setAvailableCommands(commands)
+            .setPlaylist(listOf(previousItem, currentItem, nextItem))
+            .setCurrentMediaItemIndex(1)
+            .setPlaybackState(Player.STATE_READY)
+            .setPlayWhenReady(!s.paused, Player.PLAY_WHEN_READY_CHANGE_REASON_REMOTE)
+            .setContentPositionMs { extrapolatedPositionMs() }
+            .setSeekBackIncrementMs(10_000)
+            .setSeekForwardIncrementMs(30_000)
+            .setMaxSeekToPreviousPositionMs(3_000)
+
+        if (s.volumePercent != null) {
+            builder
+                .setDeviceInfo(
+                    DeviceInfo.Builder(DeviceInfo.PLAYBACK_TYPE_REMOTE)
+                        .setMinVolume(0)
+                        .setMaxVolume(100)
+                        .build()
+                )
+                .setDeviceVolume(s.volumePercent)
+        }
+
+        return builder.build()
+    }
+
+    override fun handleSetPlayWhenReady(playWhenReady: Boolean): ListenableFuture<*> {
+        // Optimistic local update; the next poll confirms the real state.
+        status = status.copy(paused = !playWhenReady, playing = true)
+        setPositionAnchor(extrapolatedPositionMs().toDouble())
+        listener.onSetPaused(!playWhenReady)
+        return Futures.immediateVoidFuture()
+    }
+
+    override fun handleSeek(
+        mediaItemIndex: Int,
+        positionMs: Long,
+        seekCommand: Int,
+    ): ListenableFuture<*> {
+        when {
+            mediaItemIndex > 1 -> listener.onNext()
+            mediaItemIndex < 1 -> listener.onPrevious()
+            else -> {
+                val target = if (positionMs == C.TIME_UNSET) 0L else positionMs.coerceAtLeast(0)
+                setPositionAnchor(target.toDouble())
+                listener.onSeekTo(target / 1000.0)
+            }
+        }
+        return Futures.immediateVoidFuture()
+    }
+
+    override fun handleStop(): ListenableFuture<*> {
+        status = RemoteStatus.IDLE
+        listener.onStop()
+        return Futures.immediateVoidFuture()
+    }
+
+    override fun handleSetDeviceVolume(deviceVolume: Int, flags: Int): ListenableFuture<*> {
+        val vol = deviceVolume.coerceIn(0, 100)
+        status = status.copy(volumePercent = vol)
+        listener.onSetVolume(vol)
+        return Futures.immediateVoidFuture()
+    }
+
+    override fun handleIncreaseDeviceVolume(flags: Int): ListenableFuture<*> =
+        handleSetDeviceVolume((status.volumePercent ?: 0) + 5, flags)
+
+    override fun handleDecreaseDeviceVolume(flags: Int): ListenableFuture<*> =
+        handleSetDeviceVolume((status.volumePercent ?: 0) - 5, flags)
+
+    override fun handleRelease(): ListenableFuture<*> = Futures.immediateVoidFuture()
+}

app/src/main/java/pro/relaytv/RemoteStatus.kt

@@ -0,0 +1,64 @@
+package pro.relaytv
+
+import org.json.JSONObject
+
+/**
+ * Snapshot of the active server's playback state, parsed from GET /status.
+ * Parsing is intentionally defensive across RelayTV server versions
+ * (mirrors the field fallbacks used by the Home Assistant integration).
+ */
+data class RemoteStatus(
+    val playing: Boolean = false,
+    val paused: Boolean = false,
+    val positionSec: Double? = null,
+    val durationSec: Double? = null,
+    val title: String? = null,
+    val thumbnail: String? = null,
+    val volumePercent: Int? = null,
+) {
+    val active: Boolean get() = playing || paused
+
+    companion object {
+        val IDLE = RemoteStatus()
+
+        fun parse(body: String): RemoteStatus {
+            val o = try {
+                JSONObject(body)
+            } catch (_: Exception) {
+                return IDLE
+            }
+
+            fun num(vararg keys: String): Double? {
+                for (k in keys) {
+                    if (o.has(k) && !o.isNull(k)) {
+                        val v = o.optDouble(k, Double.NaN)
+                        if (!v.isNaN()) return v
+                    }
+                }
+                return null
+            }
+
+            val np = o.optJSONObject("now_playing") ?: o.optJSONObject("media")
+
+            fun str(obj: JSONObject?, vararg keys: String): String? {
+                if (obj == null) return null
+                for (k in keys) {
+                    val v = obj.optString(k, "")
+                    if (v.isNotBlank() && v != "null") return v
+                }
+                return null
+            }
+
+            return RemoteStatus(
+                playing = o.optBoolean("playing") || o.optBoolean("is_playing") || o.optBoolean("play"),
+                paused = o.optBoolean("paused") || o.optBoolean("is_paused") || o.optBoolean("pause"),
+                positionSec = num("position", "pos", "time"),
+                durationSec = num("duration", "len", "total"),
+                title = str(np, "title", "name") ?: str(o, "title"),
+                thumbnail = str(np, "thumbnail_local", "thumbnail", "thumb")
+                    ?: str(o, "thumbnail_local", "thumbnail", "thumb"),
+                volumePercent = num("volume", "vol")?.let { it.toInt().coerceIn(0, 100) },
+            )
+        }
+    }
+}

app/src/main/java/pro/relaytv/SettingsActivity.kt

@@ -1,18 +1,68 @@
 package pro.relaytv
 
+import android.content.Intent
 import android.os.Bundle
+import android.view.View
+import android.widget.LinearLayout
 import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsCompat
+import com.google.android.material.appbar.AppBarLayout
+import com.google.android.material.appbar.MaterialToolbar
+import com.google.android.material.materialswitch.MaterialSwitch
 
-/**
- * Kept for backward compatibility (older deep links / flows).
- * This activity simply opens the server picker inside MainActivity.
- */
 class SettingsActivity : AppCompatActivity() {
+
+    @androidx.annotation.OptIn(androidx.media3.common.util.UnstableApi::class)
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        startActivity(android.content.Intent(this, MainActivity::class.java).apply {
+        setContentView(R.layout.activity_settings)
+
+        val appBar = findViewById<AppBarLayout>(R.id.appBar)
+        applyWindowInsets(appBar)
+
+        val toolbar = findViewById<MaterialToolbar>(R.id.toolbar)
+        toolbar.setNavigationIcon(androidx.appcompat.R.drawable.abc_ic_ab_back_material)
+        toolbar.setNavigationOnClickListener { finish() }
+
+        val mediaSwitch = findViewById<MaterialSwitch>(R.id.switchMediaControls)
+        mediaSwitch.isChecked = AppSettings.isMediaControlsEnabled(this)
+        mediaSwitch.setOnCheckedChangeListener { _, checked ->
+            AppSettings.setMediaControlsEnabled(this, checked)
+            val svc = Intent(this, MediaControlService::class.java)
+            if (checked) {
+                runCatching { startService(svc) }
+            } else {
+                stopService(svc)
+            }
+        }
+        findViewById<LinearLayout>(R.id.rowMediaControls).setOnClickListener {
+            mediaSwitch.toggle()
+        }
+
+        findViewById<LinearLayout>(R.id.rowManageServers).setOnClickListener {
+            startActivity(Intent(this, MainActivity::class.java).apply {
                 putExtra("open_servers", true)
+                addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP or Intent.FLAG_ACTIVITY_SINGLE_TOP)
             })
             finish()
         }
     }
+
+    private fun applyWindowInsets(appBar: AppBarLayout) {
+        val initialTop = appBar.paddingTop
+        val initialLeft = appBar.paddingLeft
+        val initialRight = appBar.paddingRight
+        ViewCompat.setOnApplyWindowInsetsListener(appBar) { view: View, insets: WindowInsetsCompat ->
+            val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars())
+            view.setPadding(
+                initialLeft + systemBars.left,
+                initialTop + systemBars.top,
+                initialRight + systemBars.right,
+                view.paddingBottom
+            )
+            insets
+        }
+        ViewCompat.requestApplyInsets(appBar)
+    }
+}

app/src/main/res/layout/activity_settings.xml

@@ -0,0 +1,99 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <com.google.android.material.appbar.AppBarLayout
+        android:id="@+id/appBar"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content">
+
+        <com.google.android.material.appbar.MaterialToolbar
+            android:id="@+id/toolbar"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            app:title="@string/settings" />
+    </com.google.android.material.appbar.AppBarLayout>
+
+    <androidx.core.widget.NestedScrollView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        app:layout_behavior="@string/appbar_scrolling_view_behavior">
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="vertical"
+            android:paddingTop="8dp">
+
+            <LinearLayout
+                android:id="@+id/rowMediaControls"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:orientation="horizontal"
+                android:gravity="center_vertical"
+                android:background="?attr/selectableItemBackground"
+                android:paddingStart="20dp"
+                android:paddingEnd="20dp"
+                android:paddingTop="14dp"
+                android:paddingBottom="14dp">
+
+                <LinearLayout
+                    android:layout_width="0dp"
+                    android:layout_height="wrap_content"
+                    android:layout_weight="1"
+                    android:orientation="vertical">
+
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="@string/media_controls_title"
+                        android:textAppearance="?attr/textAppearanceTitleMedium"
+                        android:textColor="@android:color/white" />
+
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:layout_marginTop="2dp"
+                        android:text="@string/media_controls_summary"
+                        android:textAppearance="?attr/textAppearanceBodyMedium"
+                        android:textColor="#B3FFFFFF" />
+                </LinearLayout>
+
+                <com.google.android.material.materialswitch.MaterialSwitch
+                    android:id="@+id/switchMediaControls"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_marginStart="16dp" />
+            </LinearLayout>
+
+            <LinearLayout
+                android:id="@+id/rowManageServers"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:orientation="vertical"
+                android:background="?attr/selectableItemBackground"
+                android:paddingStart="20dp"
+                android:paddingEnd="20dp"
+                android:paddingTop="14dp"
+                android:paddingBottom="14dp">
+
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="@string/settings_manage_servers"
+                    android:textAppearance="?attr/textAppearanceTitleMedium"
+                    android:textColor="@android:color/white" />
+
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="2dp"
+                    android:text="@string/settings_manage_servers_summary"
+                    android:textAppearance="?attr/textAppearanceBodyMedium"
+                    android:textColor="#B3FFFFFF" />
+            </LinearLayout>
+        </LinearLayout>
+    </androidx.core.widget.NestedScrollView>
+</androidx.coordinatorlayout.widget.CoordinatorLayout>

app/src/main/res/menu/main_menu.xml

@@ -11,6 +11,10 @@
         android:title="@string/reload"
         android:icon="@android:drawable/ic_popup_sync"
         app:showAsAction="ifRoom" />
+    <item
+        android:id="@+id/action_settings"
+        android:title="@string/settings"
+        app:showAsAction="never" />
     <item
         android:id="@+id/action_privacy"
         android:title="@string/privacy_policy"

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

@@ -34,4 +34,9 @@
     <string name="privacy_policy">Privacy policy</string>
     <string name="privacy_policy_url">https://github.com/mcgeezy/relaytv-android/blob/main/docs/PRIVACY_POLICY.md</string>
     <string name="privacy_open_failed">No browser available to open the privacy policy.</string>
+    <string name="settings">Settings</string>
+    <string name="media_controls_title">Media controls</string>
+    <string name="media_controls_summary">Show system media controls (lock screen and quick settings) for playback on the active server</string>
+    <string name="settings_manage_servers">Manage servers</string>
+    <string name="settings_manage_servers_summary">Add, edit, or switch RelayTV servers</string>
 </resources>

app/src/main/res/values/styles.xml

@@ -9,7 +9,7 @@
         <item name="android:colorBackground">@color/relaytv_surface</item>
 
     </style>
-    <style name="Theme.RelayTV.NoActionBar" parent="Theme.Material3.DayNight.NoActionBar" />
+    <style name="Theme.RelayTV.NoActionBar" parent="Theme.RelayTV" />
     <style name="Theme.RelayTV.Share" parent="Theme.Material3.DayNight.NoActionBar">
         <item name="android:windowIsTranslucent">true</item>
         <item name="android:windowBackground">@android:color/transparent</item>

docs/PRIVACY_POLICY.md

@@ -1,6 +1,6 @@
 # RelayTV Android Privacy Policy
 
-Last updated: April 3, 2026
+Last updated: July 6, 2026
 
 ## Summary
 
@@ -19,6 +19,8 @@ RelayTV Android may process the following categories of data in order to operate
    - RelayTV service advertisements discovered on your local network via mDNS / NSD
 4. Device-local notification data
    - Notification text used to confirm a queue or play action
+5. Playback status data
+   - Now-playing metadata (title, artwork, playback position, volume) fetched from your selected RelayTV server to render system media controls
 
 ## How The App Uses Data
 
@@ -29,6 +31,7 @@ RelayTV Android uses the data above only to:
 3. Send shared links to RelayTV endpoints such as `/smart` or `/play_now`
 4. Discover compatible RelayTV servers on your local network
 5. Show local notifications about share results and reconnect state
+6. Show optional system media controls (lock screen / quick settings) that mirror and control playback on your selected server
 
 ## Data Storage
 
@@ -57,7 +60,9 @@ RelayTV Android may request or use these permissions:
 3. `CHANGE_WIFI_MULTICAST_STATE`
    - Required for local network RelayTV discovery on some devices
 4. `POST_NOTIFICATIONS`
-   - Required on newer Android versions to show queue/play result notifications
+   - Required on newer Android versions to show queue/play result notifications and the media controls notification
+5. `FOREGROUND_SERVICE` and `FOREGROUND_SERVICE_MEDIA_PLAYBACK`
+   - Required to keep the optional media controls notification active while your RelayTV server is playing
 
 ## Children
 

docs/RELEASE_CHECKLIST.md

@@ -29,10 +29,14 @@ Use this checklist before cutting a public release or uploading a new Play Conso
    - `app/build/outputs/bundle/release/app-release.aab`
 3. Use Play App Signing in Play Console.
 4. Complete the Data safety form for this release.
+   - The media controls feature adds no off-device data collection; no Data safety changes are expected.
 5. Provide a valid support email in Play Console.
 6. Publish a public privacy policy URL.
    - This repo includes a draft policy in `docs/PRIVACY_POLICY.md`.
    - The in-app privacy menu points to the GitHub-hosted copy on `main`.
+7. Complete the Foreground service permissions declaration (App content -> Foreground service permissions).
+   - Declares `FOREGROUND_SERVICE_MEDIA_PLAYBACK`, used by the media controls notification that mirrors playback on the user's RelayTV server.
+   - Requires a short demo video showing the media controls notification while a RelayTV server is playing.
 
 ## App-Specific Verification
 
@@ -43,6 +47,11 @@ Use this checklist before cutting a public release or uploading a new Play Conso
    - `RelayTV Play` -> `/play_now`
 4. Confirm the WebView reconnects after the RelayTV server restarts or the network drops.
 5. Confirm the privacy menu opens the published policy URL.
+6. Confirm system media controls appear while the active server is playing:
+   - Play/pause, next/previous, seek, and the volume slider control the server.
+   - The notification disappears after the server goes idle.
+   - The Settings toggle ("Media controls") removes and restores the controls.
+7. Confirm the Settings screen opens from the toolbar menu and "Manage servers" opens the server picker.
 
 ## Signing And Distribution
 

gradle.properties

@@ -1,3 +1,4 @@
+org.gradle.jvmargs=-Xmx3g -XX:MaxMetaspaceSize=1g
 android.useAndroidX=true
 android.enableJetifier=true
 android.suppressUnsupportedCompileSdk=35