Material You dynamic color toggle in Appearance settings

app/src/main/java/pm/antani/resentin/MainActivity.kt

@@ -45,13 +45,15 @@ class MainActivity : ComponentActivity() {
             val lineHeightScale by container.appPreferences.lineHeightScale.collectAsState(initial = 1f)
             val messageDensity by container.appPreferences.messageDensity.collectAsState(initial = MessageDensity.NORMAL)
             val themeMode by container.appPreferences.themeMode.collectAsState(initial = ThemeMode.SYSTEM)
+            val dynamicColor by container.appPreferences.dynamicColor.collectAsState(initial = false)
             val useDarkTheme = when (themeMode) {
                 ThemeMode.LIGHT -> false
                 ThemeMode.DARK -> true
                 ThemeMode.SYSTEM -> isSystemInDarkTheme()
             }
             ResentinTheme(
                 darkTheme = useDarkTheme,
+                dynamicColor = dynamicColor,
                 fontScale = fontScale,
                 lineHeightScale = lineHeightScale,
                 fontFamilyChoice = fontFamily,

app/src/main/java/pm/antani/resentin/data/prefs/AppPreferences.kt

@@ -92,6 +92,7 @@ class AppPreferences(private val context: Context) {
     private val keyLineSpacing = stringPreferencesKey("line_spacing")
     private val keyLineHeightScale = floatPreferencesKey("line_height_scale")
     private val keyDismissedUpdateVersion = stringPreferencesKey("dismissed_update_version")
+    private val keyDynamicColor = booleanPreferencesKey("dynamic_color")
 
     val pinnedChannels: Flow<Set<String>> = context.dataStore.data.map { it[keyPinnedChannels] ?: emptySet() }
 
@@ -349,4 +350,13 @@ class AppPreferences(private val context: Context) {
             if (epochMillis != null) it[keyPushDecryptionFailureAt] = epochMillis else it.remove(keyPushDecryptionFailureAt)
         }
     }
+
+    /** Material You dynamic color (Android 12+): system palette derived from
+     * the wallpaper instead of the hand-tuned Resentin palette. Off by
+     * default to preserve the app's visual identity. */
+    val dynamicColor: Flow<Boolean> = context.dataStore.data.map { it[keyDynamicColor] ?: false }
+
+    suspend fun setDynamicColor(value: Boolean) {
+        context.dataStore.edit { it[keyDynamicColor] = value }
+    }
 }

app/src/main/java/pm/antani/resentin/ui/appsettings/AppSettingsScreen.kt

@@ -190,6 +190,7 @@ fun AppSettingsScreen(viewModel: AppSettingsViewModel, onBack: () -> Unit, onAdm
     val unreadFirst by viewModel.unreadFirst.collectAsState()
     val fontScale by viewModel.fontScale.collectAsState()
     val themeMode by viewModel.themeMode.collectAsState()
+    val dynamicColor by viewModel.dynamicColor.collectAsState()
     val fontFamily by viewModel.fontFamily.collectAsState()
     val chatFontFamily by viewModel.chatFontFamily.collectAsState()
     val fontFamilyOptions = appFontFamilyOptions()
@@ -398,6 +399,17 @@ fun AppSettingsScreen(viewModel: AppSettingsViewModel, onBack: () -> Unit, onAdm
                         ),
                         onSelected = viewModel::setThemeMode,
                     )
+                    // Material You esiste solo da Android 12 (API 31): sotto,
+                    // la voce non viene mostrata proprio.
+                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
+                        SettingsRowDivider()
+                        SettingsSwitchRow(
+                            title = stringResource(R.string.settings_dynamic_color),
+                            description = stringResource(R.string.settings_dynamic_color_desc),
+                            checked = dynamicColor,
+                            onCheckedChange = viewModel::setDynamicColor,
+                        )
+                    }
                     SettingsRowDivider()
                     SettingsBlockLabel(
                         text = stringResource(R.string.settings_language),

app/src/main/java/pm/antani/resentin/ui/appsettings/AppSettingsViewModel.kt

@@ -188,6 +188,13 @@ class AppSettingsViewModel(
         viewModelScope.launch { appPreferences.setReplyStyle(style) }
     }
 
+    val dynamicColor: StateFlow<Boolean> = appPreferences.dynamicColor
+        .stateIn(viewModelScope, SharingStarted.WhileSubscribed(5_000), false)
+
+    fun setDynamicColor(enabled: Boolean) {
+        viewModelScope.launch { appPreferences.setDynamicColor(enabled) }
+    }
+
     fun onReplyCustomTemplateChange(value: String) =
         _uiState.update { it.copy(replyCustomTemplate = value, replyCustomTemplateSaved = false) }
 

app/src/main/java/pm/antani/resentin/ui/home/HomeScreen.kt

@@ -187,7 +187,7 @@ fun HomeScreen(
                         Surface(
                             modifier = Modifier.size(40.dp),
                             shape = MaterialTheme.shapes.extraSmall,
-                            color = Color(0xFF4E342E),
+                            color = MaterialTheme.colorScheme.primaryContainer,
                         ) {
                             androidx.compose.foundation.Image(
                                 painter = androidx.compose.ui.res.painterResource(

app/src/main/java/pm/antani/resentin/ui/login/LoginScreen.kt

@@ -115,7 +115,7 @@ fun LoginScreen(viewModel: LoginViewModel) {
             Surface(
                 modifier = Modifier.size(72.dp),
                 shape = MaterialTheme.shapes.large,
-                color = androidx.compose.ui.graphics.Color(0xFF4E342E),
+                color = MaterialTheme.colorScheme.primaryContainer,
             ) {
                 androidx.compose.foundation.Image(
                     painter = androidx.compose.ui.res.painterResource(

app/src/main/java/pm/antani/resentin/ui/theme/Theme.kt

@@ -5,9 +5,12 @@ import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Shapes
 import androidx.compose.material3.Typography
 import androidx.compose.material3.darkColorScheme
+import androidx.compose.material3.dynamicDarkColorScheme
+import androidx.compose.material3.dynamicLightColorScheme
 import androidx.compose.material3.lightColorScheme
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.CompositionLocalProvider
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.TextStyle
 import androidx.compose.ui.unit.dp
 import pm.antani.resentin.data.prefs.AppFontFamily
@@ -108,7 +111,14 @@ fun ResentinTheme(
     chatFontFamilyChoice: AppFontFamily = AppFontFamily.SYSTEM,
     content: @Composable () -> Unit,
 ) {
+    // Material You: palette generata dal sistema dai colori dello sfondo
+    // (Android 12+). Sotto API 31, o a toggle spento, resta la palette
+    // Resentin curata a mano. Forme, tipografia e scale non cambiano mai.
     val colorScheme = when {
+        dynamicColor && android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.S -> {
+            val context = LocalContext.current
+            if (darkTheme) dynamicDarkColorScheme(context) else dynamicLightColorScheme(context)
+        }
         darkTheme -> DarkColorScheme
         else -> LightColorScheme
     }

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

@@ -378,6 +378,8 @@
     <string name="settings_theme_system">System</string>
     <string name="settings_theme_light">Light</string>
     <string name="settings_theme_dark">Dark</string>
+    <string name="settings_dynamic_color">Dynamic colors</string>
+    <string name="settings_dynamic_color_desc">Match your wallpaper colors (Material You, Android 12+)</string>
     <string name="settings_font_family">App font</string>
     <string name="settings_font_family_desc">Applies across the app interface.</string>
     <string name="settings_chat_font_family">Chat font</string>

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

@@ -384,6 +384,8 @@
     <string name="settings_theme_system">Sistema</string>
     <string name="settings_theme_light">Chiaro</string>
     <string name="settings_theme_dark">Scuro</string>
+    <string name="settings_dynamic_color">Colori dinamici</string>
+    <string name="settings_dynamic_color_desc">Usa i colori dello sfondo del telefono (Material You, Android 12+)</string>
     <string name="settings_font_family">Font dell’app</string>
     <string name="settings_font_family_desc">Si applica a tutta l’interfaccia.</string>
     <string name="settings_chat_font_family">Font della chat</string>