feat(theme): backport wallpaper color extraction to API < 31 (rukamori#1219)

Co-authored-by: morieeattonkatsu <107134739+rukamori@users.noreply.github.com>

Author: sang765

app/src/main/kotlin/moe/rukamori/archivetune/MainActivity.kt

@@ -192,6 +192,7 @@ import moe.rukamori.archivetune.constants.AppLanguageKey
 import moe.rukamori.archivetune.constants.UseSystemLanguageKey
 import moe.rukamori.archivetune.constants.CustomFontUriKey
 import moe.rukamori.archivetune.constants.CustomThemeColorKey
+import moe.rukamori.archivetune.constants.WallpaperExtractionFailedKey
 import moe.rukamori.archivetune.constants.DarkModeKey
 import moe.rukamori.archivetune.constants.DefaultOpenTabKey
 import moe.rukamori.archivetune.constants.DisableAnimationsKey
@@ -286,6 +287,7 @@ import moe.rukamori.archivetune.ui.theme.ArchiveTuneTheme
 import moe.rukamori.archivetune.ui.theme.ColorSaver
 import moe.rukamori.archivetune.ui.theme.DefaultThemeColor
 import moe.rukamori.archivetune.ui.theme.extractThemeColor
+import moe.rukamori.archivetune.ui.theme.extractWallpaperThemeColor
 import moe.rukamori.archivetune.ui.utils.appBarScrollBehavior
 import moe.rukamori.archivetune.ui.utils.backToMain
 import moe.rukamori.archivetune.ui.utils.resetHeightOffset
@@ -833,7 +835,11 @@ class MainActivity : ComponentActivity() {
                         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
                             themeColor = DefaultThemeColor
                         } else {
-                            themeColor = customThemeColor
+                            val wallpaperColor = extractWallpaperThemeColor(this@MainActivity)
+                            themeColor = wallpaperColor ?: customThemeColor
+                            dataStore.edit { prefs ->
+                                prefs[WallpaperExtractionFailedKey] = wallpaperColor == null
+                            }
                         }
                     }
                 }

app/src/main/kotlin/moe/rukamori/archivetune/constants/PreferenceKeys.kt

@@ -23,6 +23,7 @@ val DarkModeKey = stringPreferencesKey("darkMode")
 val PureBlackKey = booleanPreferencesKey("pureBlack")
 val DisableAnimationsKey = booleanPreferencesKey("disableAnimations")
 val ForceHighRefreshRateKey = booleanPreferencesKey("forceHighRefreshRate")
+val WallpaperExtractionFailedKey = booleanPreferencesKey("wallpaperExtractionFailed")
 val EnableHapticFeedbackKey = booleanPreferencesKey("enableHapticFeedback")
 val UseSystemFontKey = booleanPreferencesKey("useSystemFont")
 val FontPreferenceKey = stringPreferencesKey("fontPreference")

app/src/main/kotlin/moe/rukamori/archivetune/ui/screens/settings/AppearanceSettings.kt

@@ -116,6 +116,7 @@ import moe.rukamori.archivetune.constants.SwipeSensitivityKey
 import moe.rukamori.archivetune.constants.SwipeThumbnailKey
 import moe.rukamori.archivetune.constants.SwipeToSongKey
 import moe.rukamori.archivetune.constants.ThumbnailCornerRadiusKey
+import moe.rukamori.archivetune.constants.WallpaperExtractionFailedKey
 import moe.rukamori.archivetune.constants.toLibraryFilterOrder
 import moe.rukamori.archivetune.constants.toLibraryFilterPreference
 import moe.rukamori.archivetune.constants.toPlaylistTagOrder
@@ -154,6 +155,11 @@ fun AppearanceSettings(navController: NavController) {
             DynamicThemeKey,
             defaultValue = true,
         )
+    val (wallpaperExtractionFailed) =
+        rememberPreference(
+            WallpaperExtractionFailedKey,
+            defaultValue = false,
+        )
     val (randomThemeOnStartup, onRandomThemeOnStartupChange) =
         rememberPreference(
             RandomThemeOnStartupKey,
@@ -540,7 +546,23 @@ fun AppearanceSettings(navController: NavController) {
                     )
                 }
 
-                item(visible = !dynamicTheme || Build.VERSION.SDK_INT < Build.VERSION_CODES.S) {
+                item(visible = dynamicTheme && Build.VERSION.SDK_INT < Build.VERSION_CODES.S && wallpaperExtractionFailed) {
+                    PreferenceEntry(
+                        title = { Text(stringResource(R.string.wallpaper_permission)) },
+                        description = stringResource(R.string.wallpaper_permission_desc),
+                        icon = { Icon(painterResource(R.drawable.storage), null) },
+                        onClick = {
+                            val intent =
+                                android.content.Intent(
+                                    android.provider.Settings.ACTION_APPLICATION_DETAILS_SETTINGS,
+                                    android.net.Uri.fromParts("package", context.packageName, null),
+                                )
+                            context.startActivity(intent)
+                        },
+                    )
+                }
+
+                item(visible = !dynamicTheme) {
                     SwitchPreference(
                         title = { Text(stringResource(R.string.random_theme_on_startup)) },
                         description = stringResource(R.string.random_theme_on_startup_desc),

app/src/main/kotlin/moe/rukamori/archivetune/ui/theme/Theme.kt

@@ -7,7 +7,10 @@
 
 package moe.rukamori.archivetune.ui.theme
 
+import android.app.WallpaperManager
+import android.content.Context
 import android.graphics.Bitmap
+import android.graphics.drawable.BitmapDrawable
 import android.os.Build
 import android.util.Base64
 import androidx.compose.animation.animateColorAsState
@@ -450,6 +453,31 @@ fun Bitmap.extractGradientColors(): List<Color> {
         .sortedByDescending { it.luminance() }
 }
 
+fun extractWallpaperThemeColor(context: Context): Color? {
+    return try {
+        val wallpaperManager = WallpaperManager.getInstance(context)
+        val drawable = wallpaperManager.drawable ?: return null
+        val bitmap =
+            if (drawable is BitmapDrawable) {
+                drawable.bitmap
+            } else {
+                val bmp =
+                    Bitmap.createBitmap(
+                        drawable.intrinsicWidth.coerceAtLeast(1),
+                        drawable.intrinsicHeight.coerceAtLeast(1),
+                        Bitmap.Config.ARGB_8888,
+                    )
+                val canvas = android.graphics.Canvas(bmp)
+                drawable.setBounds(0, 0, canvas.width, canvas.height)
+                drawable.draw(canvas)
+                bmp
+            }
+        bitmap.extractThemeColor()
+    } catch (e: Exception) {
+        null
+    }
+}
+
 fun ColorScheme.pureBlack(apply: Boolean) =
     if (apply) {
         copy(

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

@@ -339,6 +339,8 @@
     <string name="app_icon_change_failed">Couldn\'t change the app icon</string>
     <string name="theme">Theme</string>
     <string name="enable_dynamic_theme">Enable dynamic theme</string>
+    <string name="wallpaper_permission">Wallpaper color permission</string>
+    <string name="wallpaper_permission_desc">Grant storage permission to extract colors from your wallpaper on older devices</string>
     <string name="random_theme_on_startup">Random theme on startup</string>
     <string name="random_theme_on_startup_desc">Apply a random color palette every time the app starts</string>
     <string name="font_preference">Font</string>