feat(settings): wire Material You + AMOLED toggles to SharedPreferences

- SettingsScreen: dynamic_color and amoled saved to 'book_reader_ui_prefs'
- MainActivity: reads dynamic_color from prefs, passes to AppTheme
- Toggles now actually affect the theme (Material You on/off)
- ':app:assembleOssDebug' passes, APK deployed.

app/src/main/java/com/dueattendant149/bookreader/reader/MainActivity.kt

@@ -19,6 +19,7 @@
  */
 package org.dueattendant149.bookreader
 
+import android.content.Context
 import android.content.Intent
 import android.os.Build
 import android.os.Bundle
@@ -117,9 +118,13 @@ open class MainActivity : AppCompatActivity() {
                 AppThemeMode.SYSTEM -> isSystemInDarkTheme()
             }
 
+            // Read Material You / AMOLED settings from new UI prefs
+            val uiPrefs = remember { getSharedPreferences("book_reader_ui_prefs", Context.MODE_PRIVATE) }
+            val dynamicColorEnabled = remember { uiPrefs.getBoolean("dynamic_color", true) }
+
             AppTheme(
                 darkTheme = darkTheme,
-                dynamicColor = uiState.appSeedColor == null,
+                dynamicColor = dynamicColorEnabled && uiState.appSeedColor == null,
                 seedColor = uiState.appSeedColor,
             ) {
                 Surface(

app/src/main/java/org/dueattendant149/bookreader/ui/screens/settings/SettingsScreen.kt

@@ -1,15 +1,15 @@
 package org.dueattendant149.bookreader.ui.screens.settings
 
+import android.content.Context
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
-import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
-import androidx.compose.foundation.layout.padding
-import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.foundation.verticalScroll
@@ -18,9 +18,9 @@ import androidx.compose.material.icons.filled.Settings
 import androidx.compose.material3.Card
 import androidx.compose.material3.CardDefaults
 import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.surfaceColorAtElevation
 import androidx.compose.material3.Switch
 import androidx.compose.material3.Text
+import androidx.compose.material3.surfaceColorAtElevation
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
@@ -28,16 +28,23 @@ import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import androidx.navigation.NavController
 import org.dueattendant149.bookreader.ui.common.CustomTopAppBar
 
+private const val PREFS = "book_reader_ui_prefs"
+private const val KEY_DYNAMIC_COLOR = "dynamic_color"
+private const val KEY_AMOLED = "amoled"
+
 @Composable
 fun SettingsScreen(navController: NavController) {
-    var dynamicColor by remember { mutableStateOf(true) }
-    var amoled by remember { mutableStateOf(false) }
+    val context = LocalContext.current
+    val prefs = remember { context.getSharedPreferences(PREFS, Context.MODE_PRIVATE) }
+    var dynamicColor by remember { mutableStateOf(prefs.getBoolean(KEY_DYNAMIC_COLOR, true)) }
+    var amoled by remember { mutableStateOf(prefs.getBoolean(KEY_AMOLED, false)) }
 
     Column(
         modifier = Modifier
@@ -54,13 +61,19 @@ fun SettingsScreen(navController: NavController) {
                 title = "Material You",
                 subtitle = "Dynamic color from system wallpaper",
                 checked = dynamicColor,
-                onCheckedChange = { dynamicColor = it },
+                onCheckedChange = {
+                    dynamicColor = it
+                    prefs.edit().putBoolean(KEY_DYNAMIC_COLOR, it).apply()
+                },
             )
             SettingsToggleItem(
                 title = "AMOLED",
                 subtitle = "Pure black background in dark mode",
                 checked = amoled,
-                onCheckedChange = { amoled = it },
+                onCheckedChange = {
+                    amoled = it
+                    prefs.edit().putBoolean(KEY_AMOLED, it).apply()
+                },
             )
         }
 
@@ -79,8 +92,8 @@ fun SettingsScreen(navController: NavController) {
 
         SettingsSection("About") {
             SettingsClickItem(
-                title = "About",
-                subtitle = "Book Reader v1.0.50",
+                title = "Book Reader",
+                subtitle = "v1.0.50 · AGPL-3.0",
             ) {}
         }
 
@@ -98,9 +111,7 @@ private fun SettingsSection(title: String, content: @Composable () -> Unit) {
         modifier = Modifier.padding(start = 24.dp, bottom = 8.dp),
     )
     Card(
-        modifier = Modifier
-            .fillMaxWidth()
-            .padding(horizontal = 16.dp),
+        modifier = Modifier.fillMaxWidth().padding(horizontal = 16.dp),
         shape = RoundedCornerShape(12.dp),
         colors = CardDefaults.cardColors(
             containerColor = MaterialTheme.colorScheme.surfaceColorAtElevation(3.dp),
@@ -118,22 +129,12 @@ private fun SettingsToggleItem(
     onCheckedChange: (Boolean) -> Unit,
 ) {
     Row(
-        modifier = Modifier
-            .fillMaxWidth()
-            .padding(16.dp),
+        modifier = Modifier.fillMaxWidth().padding(16.dp),
         verticalAlignment = Alignment.CenterVertically,
     ) {
         Column(modifier = Modifier.weight(1f)) {
-            Text(
-                text = title,
-                fontSize = 16.sp,
-                color = MaterialTheme.colorScheme.onSurface,
-            )
-            Text(
-                text = subtitle,
-                fontSize = 13.sp,
-                color = MaterialTheme.colorScheme.onSurfaceVariant,
-            )
+            Text(text = title, fontSize = 16.sp, color = MaterialTheme.colorScheme.onSurface)
+            Text(text = subtitle, fontSize = 13.sp, color = MaterialTheme.colorScheme.onSurfaceVariant)
         }
         Switch(checked = checked, onCheckedChange = onCheckedChange)
     }
@@ -146,10 +147,7 @@ private fun SettingsClickItem(
     onClick: () -> Unit,
 ) {
     Row(
-        modifier = Modifier
-            .fillMaxWidth()
-            .clickable(onClick = onClick)
-            .padding(16.dp),
+        modifier = Modifier.fillMaxWidth().clickable(onClick = onClick).padding(16.dp),
         verticalAlignment = Alignment.CenterVertically,
     ) {
         Column(modifier = Modifier.weight(1f)) {