Add Service and show clock on second screen

app/src/main/AndroidManifest.xml

@@ -12,10 +12,14 @@
         android:supportsRtl="true"
         android:theme="@style/Theme.CatFlipScreen"
         tools:targetApi="31">
+        <service
+            android:name=".FlipScreenService"
+            android:enabled="true"
+            android:exported="false"/>
+
         <activity
             android:name=".MainActivity"
             android:exported="true"
-            android:label="@string/app_name"
             android:theme="@style/Theme.CatFlipScreen">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />

app/src/main/java/net/mezimmah/catflipscreen/FlipScreenService.kt

@@ -0,0 +1,41 @@
+package net.mezimmah.catflipscreen
+
+import android.app.Service
+import android.content.Context
+import android.content.Intent
+import android.media.MediaRouter
+import android.os.IBinder
+import android.util.Log
+
+class FlipScreenService : Service() {
+
+    override fun onBind(intent: Intent): IBinder {
+        TODO("Return the communication channel to the service.")
+    }
+
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        showPresentationScreen()
+
+        return super.onStartCommand(intent, flags, startId)
+    }
+
+    private fun showPresentationScreen() {
+        val selectedRoute =
+            (this.getSystemService(Context.MEDIA_ROUTER_SERVICE) as MediaRouter).getSelectedRoute(1)
+        val presentationDisplay = selectedRoute?.presentationDisplay
+        val mPresentation =
+            PresentationScreen(this, presentationDisplay)
+        Log.i("StatusBar", "Showing presentation on display: $presentationDisplay")
+        try {
+            mPresentation.requestWindowFeature(1)
+            mPresentation.show()
+            Log.i("StatusBar", "Showing presentation.")
+        } catch (e: Exception) {
+            Log.w(
+                "StatusBar",
+                "Couldn't show presentation!  Display was removed in the meantime.",
+                e
+            )
+        }
+    }
+}

app/src/main/java/net/mezimmah/catflipscreen/MainActivity.kt

@@ -1,5 +1,6 @@
 package net.mezimmah.catflipscreen
 
+import android.content.Intent
 import android.os.Bundle
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
@@ -26,7 +27,9 @@ class MainActivity : ComponentActivity() {
                 }
             }
         }
+        startService(Intent(this, FlipScreenService::class.java))
     }
+
 }
 
 @Composable

app/src/main/java/net/mezimmah/catflipscreen/PresentationScreen.kt

@@ -0,0 +1,17 @@
+package net.mezimmah.catflipscreen
+
+import android.app.Presentation
+import android.content.Context
+import android.os.Bundle
+import android.view.Display
+
+class PresentationScreen(outerContext: Context?, display: Display?) :
+    Presentation(outerContext, display) {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        setContentView(R.layout.layout_screen)
+
+    }
+}

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

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:background="@color/black"
+    android:layout_width="96dp"
+    android:layout_height="96dp">
+
+    <TextClock
+        android:id="@+id/textView"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:format12Hour="hh:mm"
+        android:textColor="@color/white"
+        android:textSize="28sp"
+        android:textAlignment="center"
+        android:text="@string/app_name"/>
+
+</LinearLayout>