added dark mode , detect system theme

README.md

@@ -8,6 +8,20 @@ Stims lets you select apps that should prevent your screen from turning off. Whe
 
 ---
 
+## Permissions
+
+Stims requires **Usage Access** permission to detect which app is in the foreground so it can keep the phone awake.
+
+On first launch the app will redirect you to the system settings screen. To enable it:
+
+1. Go to **Settings → Apps → Special app access → Usage access**
+2. Find **Stims** in the list and toggle it on
+3. Return to the app
+
+Without this permission the background service cannot detect foreground apps and the screen will not be kept awake.
+
+---
+
 # Building from source
 
 **Requirements**

app/src/main/java/acidburn/stims/MainActivity.kt

@@ -32,6 +32,7 @@ import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import androidx.core.graphics.drawable.toBitmap
+import acidburn.stims.ui.theme.StimsTheme
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 
@@ -49,11 +50,13 @@ class MainActivity : ComponentActivity() {
         prefs = getSharedPreferences("stims_prefs", Context.MODE_PRIVATE)
         
         setContent {
-            Surface(
-                modifier = Modifier.fillMaxSize(),
-                color = MaterialTheme.colorScheme.background
-            ) {
-                AppListScreen(prefs)
+            StimsTheme {
+                Surface(
+                    modifier = Modifier.fillMaxSize(),
+                    color = MaterialTheme.colorScheme.background
+                ) {
+                    AppListScreen(prefs)
+                }
             }
         }
     }

app/src/main/java/acidburn/stims/ui/theme/Theme.kt

@@ -0,0 +1,31 @@
+package acidburn.stims.ui.theme
+
+import android.os.Build
+import androidx.compose.foundation.isSystemInDarkTheme
+import androidx.compose.material3.MaterialTheme
+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.ui.platform.LocalContext
+
+@Composable
+fun StimsTheme(content: @Composable () -> Unit) {
+    val darkTheme = isSystemInDarkTheme()
+    val context = LocalContext.current
+
+    val colorScheme = when {
+        Build.VERSION.SDK_INT >= Build.VERSION_CODES.S -> {
+            if (darkTheme) dynamicDarkColorScheme(context)
+            else dynamicLightColorScheme(context)
+        }
+        darkTheme -> darkColorScheme()
+        else -> lightColorScheme()
+    }
+
+    MaterialTheme(
+        colorScheme = colorScheme,
+        content = content
+    )
+}

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

@@ -1,6 +1,6 @@
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
-    <style name="Theme.Stims" parent="Theme.Material3.Light.NoActionBar">
+    <style name="Theme.Stims" parent="Theme.Material3.DayNight.NoActionBar">
         <!-- Customize your theme here. -->
     </style>
 </resources>