From 36233da1983a4e32f17014110b800ce3e44da17f Mon Sep 17 00:00:00 2001
From: Eric85710 <ericchen87887@gmail.com>
Date: Fri, 24 Apr 2026 16:38:47 +0800
Subject: [PATCH] dark mode-v10

---
 app/src/main/java/com/example/login_v3/MainActivity.kt | 10 +++++++---
 .../detail_UI/setting_Theme_Page.kt                    |  4 +++-
 .../setting_detail_page/viewmodel/Theme_ViewModel.kt   |  9 ++++++---
 3 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/app/src/main/java/com/example/login_v3/MainActivity.kt b/app/src/main/java/com/example/login_v3/MainActivity.kt
index 3258fa3..7e87cd3 100644
--- a/app/src/main/java/com/example/login_v3/MainActivity.kt
+++ b/app/src/main/java/com/example/login_v3/MainActivity.kt
@@ -5,18 +5,20 @@ import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
 import androidx.activity.viewModels
+import androidx.compose.runtime.collectAsState
 import androidx.core.splashscreen.SplashScreen.Companion.installSplashScreen
 import com.example.login_v3.auth.HealthCheckScreen
 import com.example.login_v3.home.setting.setting_detail_page.viewmodel.Theme_ViewModel
 import com.example.login_v3.ui.theme.AppTheme
 import com.example.login_v3.ui.theme.Login_V3Theme
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.setValue
 import dagger.hilt.android.AndroidEntryPoint
 
 @AndroidEntryPoint
 class MainActivity : ComponentActivity() {
 
-    //color mode viewmodel
-    private val themeViewModel by viewModels<Theme_ViewModel>()
+    private val themeViewModel: Theme_ViewModel by viewModels()
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -24,7 +26,9 @@ class MainActivity : ComponentActivity() {
 
         installSplashScreen()
         setContent {
-            Login_V3Theme(appTheme = themeViewModel.currentTheme) {
+            val currentAppTheme by themeViewModel.currentTheme.collectAsState()
+
+            Login_V3Theme(appTheme = currentAppTheme) {
                 Technologia()
             }
         }
diff --git a/app/src/main/java/com/example/login_v3/home/setting/setting_detail_page/detail_UI/setting_Theme_Page.kt b/app/src/main/java/com/example/login_v3/home/setting/setting_detail_page/detail_UI/setting_Theme_Page.kt
index 2ef961d..57b2380 100644
--- a/app/src/main/java/com/example/login_v3/home/setting/setting_detail_page/detail_UI/setting_Theme_Page.kt
+++ b/app/src/main/java/com/example/login_v3/home/setting/setting_detail_page/detail_UI/setting_Theme_Page.kt
@@ -11,6 +11,8 @@ import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.RadioButton
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.unit.dp
@@ -22,7 +24,7 @@ fun setting_theme_page(
     viewModel: Theme_ViewModel
 ){
     // 直接讀取，不需要 .value
-    val selectedTheme = viewModel.currentTheme
+    val selectedTheme by viewModel.currentTheme.collectAsState()
 
     Column(modifier = Modifier.padding(16.dp)) {
         Text(
diff --git a/app/src/main/java/com/example/login_v3/home/setting/setting_detail_page/viewmodel/Theme_ViewModel.kt b/app/src/main/java/com/example/login_v3/home/setting/setting_detail_page/viewmodel/Theme_ViewModel.kt
index 0e670f0..9605815 100644
--- a/app/src/main/java/com/example/login_v3/home/setting/setting_detail_page/viewmodel/Theme_ViewModel.kt
+++ b/app/src/main/java/com/example/login_v3/home/setting/setting_detail_page/viewmodel/Theme_ViewModel.kt
@@ -5,12 +5,15 @@ import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
 import androidx.lifecycle.ViewModel
 import com.example.login_v3.ui.theme.AppTheme
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
 
 class Theme_ViewModel : ViewModel() {
-    var currentTheme by mutableStateOf(AppTheme.SYSTEM)
-        private set
+    private val _currentTheme = MutableStateFlow(AppTheme.DARK)
+    val currentTheme: StateFlow<AppTheme> = _currentTheme.asStateFlow()
 
     fun updateTheme(newTheme: AppTheme) {
-        currentTheme = newTheme
+        _currentTheme.value = newTheme
     }
 }
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