feat(kiosk): add screensaver toggle in settings (default off)

evershelf-kiosk/app/src/main/kotlin/it/dadaloop/evershelf/kiosk/KioskActivity.kt

@@ -96,6 +96,7 @@ class KioskActivity : AppCompatActivity() {
         private const val KEY_URL = "evershelf_url"
         private const val KEY_SETUP_COMPLETE = "setup_complete"
         private const val KEY_HAS_SCALE = "has_scale"
+        private const val KEY_SCREENSAVER = "screensaver_enabled"
         private const val GATEWAY_PACKAGE = "it.dadaloop.evershelf.scalegate"
         private const val GATEWAY_DOWNLOAD_URL = "https://github.com/dadaloop82/EverShelf/releases/latest/download/evershelf-scale-gateway.apk"
         private const val KIOSK_DOWNLOAD_URL = "https://github.com/dadaloop82/EverShelf/releases/latest/download/evershelf-kiosk.apk"
@@ -428,7 +429,15 @@ class KioskActivity : AppCompatActivity() {
         webView.loadUrl(url)
 
         launchGatewayInBackground()
-        window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
+        applyScreensaverFlag()
+    }
+
+    private fun applyScreensaverFlag() {
+        if (prefs.getBoolean(KEY_SCREENSAVER, false)) {
+            window.clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
+        } else {
+            window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
+        }
     }
 
     // ── Inject kiosk overlay (exit + refresh buttons) ────────────────────
@@ -778,6 +787,8 @@ class KioskActivity : AppCompatActivity() {
         if (prefs.getBoolean(KEY_SETUP_COMPLETE, false) && webView.visibility == View.VISIBLE) {
             val url = prefs.getString(KEY_URL, "") ?: ""
             if (url.isNotEmpty() && webView.url != url) webView.loadUrl(url)
+            // Re-apply screensaver flag in case the user changed it in Settings
+            applyScreensaverFlag()
         }
     }
 

evershelf-kiosk/app/src/main/kotlin/it/dadaloop/evershelf/kiosk/SettingsActivity.kt

@@ -6,11 +6,13 @@ import android.content.SharedPreferences
 import android.content.pm.PackageManager
 import android.net.Uri
 import android.os.Bundle
+import android.view.WindowManager
 import android.widget.EditText
 import android.widget.TextView
 import android.widget.Toast
 import androidx.appcompat.app.AppCompatActivity
 import com.google.android.material.button.MaterialButton
+import com.google.android.material.switchmaterial.SwitchMaterial
 import java.net.URL
 import javax.net.ssl.HttpsURLConnection
 import javax.net.ssl.SSLContext
@@ -26,6 +28,7 @@ class SettingsActivity : AppCompatActivity() {
         private const val PREFS_NAME = "evershelf_kiosk"
         private const val KEY_URL = "evershelf_url"
         private const val KEY_SETUP_COMPLETE = "setup_complete"
+        private const val KEY_SCREENSAVER = "screensaver_enabled"
         private const val GATEWAY_PACKAGE = "it.dadaloop.evershelf.scalegate"
     }
 
@@ -38,6 +41,10 @@ class SettingsActivity : AppCompatActivity() {
 
         urlEdit.setText(prefs.getString(KEY_URL, "") ?: "")
 
+        // Screensaver toggle (default OFF = keep screen on)
+        val switchScreensaver = findViewById<SwitchMaterial>(R.id.switchScreensaver)
+        switchScreensaver.isChecked = prefs.getBoolean(KEY_SCREENSAVER, false)
+
         // Gateway status
         val gatewayInstalled = try {
             packageManager.getPackageInfo(GATEWAY_PACKAGE, 0)
@@ -77,8 +84,18 @@ class SettingsActivity : AppCompatActivity() {
                 Toast.makeText(this, "URL cannot be empty", Toast.LENGTH_SHORT).show()
                 return@setOnClickListener
             }
-            prefs.edit().putString(KEY_URL, url).apply()
+            val screensaverOn = switchScreensaver.isChecked
-            Toast.makeText(this, "Settings saved", Toast.LENGTH_SHORT).show()
+            prefs.edit()
+                .putString(KEY_URL, url)
+                .putBoolean(KEY_SCREENSAVER, screensaverOn)
+                .apply()
+            // Apply FLAG_KEEP_SCREEN_ON immediately based on new setting
+            if (screensaverOn) {
+                window.clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
+            } else {
+                window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
+            }
+            Toast.makeText(this, "Impostazioni salvate", Toast.LENGTH_SHORT).show()
             finish()
         }
     }

evershelf-kiosk/app/src/main/res/layout/activity_settings.xml

@@ -143,6 +143,61 @@
                 android:textSize="13sp" />
         </LinearLayout>
 
+        <!-- Screensaver Section -->
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="SCHERMO"
+            android:textColor="#7c3aed"
+            android:textSize="12sp"
+            android:textStyle="bold"
+            android:letterSpacing="0.1"
+            android:layout_marginBottom="12dp" />
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="vertical"
+            android:background="@drawable/card_background"
+            android:padding="16dp"
+            android:layout_marginBottom="24dp">
+
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:orientation="horizontal"
+                android:gravity="center_vertical">
+
+                <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="Salvaschermo"
+                        android:textColor="#cbd5e1"
+                        android:textSize="14sp" />
+
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Oscura lo schermo dopo inattività (default: off)"
+                        android:textColor="#64748b"
+                        android:textSize="12sp"
+                        android:layout_marginTop="2dp" />
+                </LinearLayout>
+
+                <com.google.android.material.switchmaterial.SwitchMaterial
+                    android:id="@+id/switchScreensaver"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:checked="false" />
+            </LinearLayout>
+        </LinearLayout>
+
         <!-- Danger Zone -->
         <TextView
             android:layout_width="match_parent"