feat: disallow enabling keep patched APKs when external cache directory doesn't exist

app/src/main/kotlin/com/aliucord/manager/manager/PathManager.kt

@@ -34,14 +34,13 @@ class PathManager(
     val keystoreFile = aliucordDir.resolve("ks.keystore")
 
     /**
-     * Use the external cache directory (`/storage/emulated/0/Android/data/com.aliucord.manager/cache`)
+     * Uses the external cache directory (`/storage/emulated/0/Android/data/com.aliucord.manager/cache`)
      * when dev mode or preserving APKs is enabled. Otherwise, default to internal app cache.
      */
-    private val cacheDir
+    val cacheDir: File
         get() = when (prefs.devMode || prefs.keepPatchedApks) {
             false -> context.cacheDir
-            true -> context.externalCacheDir
-                ?: throw Error("External cache directory isn't supported")
+            true -> context.externalCacheDir ?: context.cacheDir
         }
 
     /**

app/src/main/kotlin/com/aliucord/manager/manager/PreferencesManager.kt

@@ -1,9 +1,11 @@
 package com.aliucord.manager.manager
 
 import android.content.SharedPreferences
+import androidx.compose.runtime.Stable
 import com.aliucord.manager.manager.base.BasePreferenceManager
 import com.aliucord.manager.ui.components.Theme
 
+@Stable
 class PreferencesManager(preferences: SharedPreferences) : BasePreferenceManager(preferences) {
     var theme by enumPreference("theme", Theme.DARK)
     var dynamicColor by booleanPreference("dynamic_color", false)

app/src/main/kotlin/com/aliucord/manager/ui/screens/settings/SettingsModel.kt

@@ -9,6 +9,8 @@ import com.aliucord.manager.manager.PreferencesManager
 import com.aliucord.manager.ui.components.Theme
 import com.aliucord.manager.util.launchBlock
 import com.aliucord.manager.util.showToast
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
 
 class SettingsModel(
     private val application: Application,
@@ -29,6 +31,19 @@ class SettingsModel(
         preferences.theme = theme
     }
 
+    fun setKeepPatchedApks(value: Boolean) {
+        // Disallow setting keep APKs if externalCacheDir doesn't exist (some ROMs)
+        if (value && application.externalCacheDir == null) {
+            screenModelScope.launch {
+                delay(300)
+                preferences.keepPatchedApks = false
+                application.showToast(R.string.setting_keep_patched_apks_error)
+            }
+        }
+
+        preferences.keepPatchedApks = value
+    }
+
     fun clearCacheDir() = screenModelScope.launchBlock {
         application.externalCacheDir?.deleteRecursively()
         application.showToast(R.string.action_cleared_cache)

app/src/main/kotlin/com/aliucord/manager/ui/screens/settings/SettingsScreen.kt

@@ -98,7 +98,7 @@ class SettingsScreen : Screen, Parcelable {
                     secondaryLabel = stringResource(R.string.setting_keep_patched_apks_desc),
                     icon = { Icon(painterResource(R.drawable.ic_delete_forever), null) },
                     pref = preferences.keepPatchedApks,
-                    onPrefChange = { preferences.keepPatchedApks = it },
+                    onPrefChange = model::setKeepPatchedApks,
                 )
 
                 var clearedCache by rememberSaveable { mutableStateOf(false) }

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

@@ -49,6 +49,7 @@
   <string name="setting_dynamic_color_desc">Enables Material You theming on Android 12+</string>
   <string name="setting_keep_patched_apks">Keep patched APKs</string>
   <string name="setting_keep_patched_apks_desc">Keep all patched files and APKs after installing for debugging.</string>
+  <string name="setting_keep_patched_apks_error">This device does not support external cache directories!</string>
 
   <string name="theme_system">System</string>
   <string name="theme_dark">Dark</string>