First implementation into the build

.idea/gradle.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>

.idea/misc.xml

@@ -1,4 +1,3 @@
-<?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ExternalStorageConfigurationManager" enabled="true" />
   <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="jbr-17" project-jdk-type="JavaSDK">

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

@@ -20,13 +20,13 @@ class FlipScreenService : Service() {
     }
 
     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 {
+            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")
             mPresentation.requestWindowFeature(1)
             mPresentation.show()
             Log.i("StatusBar", "Showing presentation.")

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

@@ -1,6 +1,7 @@
 package net.mezimmah.catflipscreen
 
 import android.content.Intent
+import android.content.SharedPreferences
 import android.os.Bundle
 import androidx.appcompat.app.AppCompatActivity
 import androidx.preference.PreferenceFragmentCompat
@@ -18,10 +19,23 @@ class MainActivity : AppCompatActivity() {
         }
         startService(Intent(this, FlipScreenService::class.java))
     }
-    class SettingsFragment : PreferenceFragmentCompat() {
+    class SettingsFragment : PreferenceFragmentCompat(), SharedPreferences.OnSharedPreferenceChangeListener {
         override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
             setPreferencesFromResource(R.xml.root_preferences, rootKey)
         }
+
+        override fun onSharedPreferenceChanged(sharedPreferences: SharedPreferences?,
+                                               key: String?) {
+//            if (key == "enable_display") {
+//            }
+        }
+
+        override fun onResume() {
+            super.onResume()
+            preferenceScreen.sharedPreferences
+                ?.registerOnSharedPreferenceChangeListener(this)
+        }
+
     }
 
 }

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

@@ -12,6 +12,5 @@ class PresentationScreen(outerContext: Context?, display: Display?) :
         super.onCreate(savedInstanceState)
 
         setContentView(R.layout.layout_screen)
-
     }
 }

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

@@ -18,5 +18,6 @@
     <string name="attachment_summary_off">Only download attachments when manually requested</string>
     <string name="time_header">Display time</string>
     <string name="show_time_title">Display Time &amp; Date</string>
+    <string name="enable_external_display">Turn on your external screen, this will restart your phone</string>
 
 </resources>