Ensure default subscription on removals

Add removeSubscriptionWithDefault in SettingsManager to remove a subscription and recreate a default subscription if none remain. Modify MmkvManager.decodeAllServerList to include servers from DEFAULT_SUBSCRIPTION_ID when it's not listed, and remove the defensive check in MmkvManager.removeSubscription so removals are delegated to SettingsManager. Update callers (SubEditActivity, SubscriptionsViewModel) to use SettingsManager.removeSubscriptionWithDefault, remove UI restrictions hiding the delete action for the default subscription, and simplify group-display logic in MainViewModel. These changes ensure a default subscription always exists and server lists include default servers when appropriate.

V2rayNG/app/src/main/java/com/v2ray/ang/handler/MmkvManager.kt

@@ -114,9 +114,15 @@ object MmkvManager {
      */
     fun decodeAllServerList(): MutableList<String> {
         val allServers = mutableListOf<String>()
+        val subsList = decodeSubsList()
 
-        // Add servers from all subscriptions (including default subscription)
-        decodeSubsList().forEach { guid ->
+        // If DEFAULT_SUBSCRIPTION_ID is not in the subscriptions list, add its servers
+        if (!subsList.contains(DEFAULT_SUBSCRIPTION_ID)) {
+            allServers.addAll(decodeServerList(DEFAULT_SUBSCRIPTION_ID))
+        }
+
+        // Add servers from all subscriptions
+        subsList.forEach { guid ->
             allServers.addAll(decodeServerList(guid))
         }
 
@@ -381,11 +387,6 @@ object MmkvManager {
      * @param subid The subscription ID.
      */
     fun removeSubscription(subid: String) {
-        // Protect default subscription from being deleted
-        if (subid == DEFAULT_SUBSCRIPTION_ID) {
-            return
-        }
-
         subStorage.remove(subid)
         val subsList = decodeSubsList()
         subsList.remove(subid)

V2rayNG/app/src/main/java/com/v2ray/ang/handler/SettingsManager.kt

@@ -25,6 +25,7 @@ import com.v2ray.ang.handler.MmkvManager.decodeServerConfig
 import com.v2ray.ang.handler.MmkvManager.decodeSubsList
 import com.v2ray.ang.handler.MmkvManager.decodeSubscription
 import com.v2ray.ang.handler.MmkvManager.encodeSubscription
+import com.v2ray.ang.handler.MmkvManager.removeSubscription
 import com.v2ray.ang.util.JsonUtil
 import com.v2ray.ang.util.Utils
 import java.io.File
@@ -36,7 +37,7 @@ object SettingsManager {
 
     fun initApp(context: Context) {
         ensureDefaultSettings()
-        ensureDefaultSubscription()
+        //ensureDefaultSubscription()
         initRoutingRulesets(context)
         migrateServerListToSubscriptions()
         migrateHysteria2PinSHA256()
@@ -240,6 +241,33 @@ object SettingsManager {
             .firstOrNull { it.remarks == remarks }
     }
 
+    /**
+     * Removes the subscription.
+     * If there are no remaining subscriptions,
+     * it creates a new default subscription to ensure that ungroup
+     **/
+    fun removeSubscriptionWithDefault(subid: String) {
+//        val subsList = decodeSubsList()
+//        if (subsList.size == 1 && subsList.first() == DEFAULT_SUBSCRIPTION_ID) {
+//            Log.i(ANG_PACKAGE,"Attempted to remove the only existing default subscription, operation ignored.")
+//            return
+//        }
+
+        // Remove the subscription
+        removeSubscription(subid)
+
+        // After removal, check if there are any subscriptions left. If not, create a default subscription.
+        val subsList2 = decodeSubsList()
+        if (subsList2.isNotEmpty()) {
+            return
+        }
+
+        val defaultSub = SubscriptionItem(
+            remarks = "Default",
+        )
+        encodeSubscription(DEFAULT_SUBSCRIPTION_ID, defaultSub)
+    }
+
     /**
      * Get the SOCKS port.
      * @return The SOCKS port.

V2rayNG/app/src/main/java/com/v2ray/ang/ui/SubEditActivity.kt

@@ -14,6 +14,7 @@ import com.v2ray.ang.extension.toast
 import com.v2ray.ang.extension.toastSuccess
 import com.v2ray.ang.handler.MmkvManager
 import com.v2ray.ang.handler.SettingsChangeManager
+import com.v2ray.ang.handler.SettingsManager
 import com.v2ray.ang.util.Utils
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
@@ -118,7 +119,7 @@ class SubEditActivity : BaseActivity() {
                 AlertDialog.Builder(this).setMessage(R.string.del_config_comfirm)
                     .setPositiveButton(android.R.string.ok) { _, _ ->
                         lifecycleScope.launch(Dispatchers.IO) {
-                            MmkvManager.removeSubscription(editSubId)
+                            SettingsManager.removeSubscriptionWithDefault(editSubId)
                             launch(Dispatchers.Main) {
                                 finish()
                             }
@@ -130,7 +131,7 @@ class SubEditActivity : BaseActivity() {
                     .show()
             } else {
                 lifecycleScope.launch(Dispatchers.IO) {
-                    MmkvManager.removeSubscription(editSubId)
+                    SettingsManager.removeSubscriptionWithDefault(editSubId)
                     launch(Dispatchers.Main) {
                         finish()
                     }
@@ -145,10 +146,6 @@ class SubEditActivity : BaseActivity() {
         del_config = menu.findItem(R.id.del_config)
         save_config = menu.findItem(R.id.save_config)
 
-        if (editSubId.isEmpty() || editSubId == AppConfig.DEFAULT_SUBSCRIPTION_ID) {
-            del_config?.isVisible = false
-        }
-
         return super.onCreateOptionsMenu(menu)
     }
 

V2rayNG/app/src/main/java/com/v2ray/ang/ui/SubSettingRecyclerAdapter.kt

@@ -39,7 +39,6 @@ class SubSettingRecyclerAdapter(
         holder.itemSubSettingBinding.layoutRemove.setOnClickListener {
             adapterListener?.onRemove(subId, position)
         }
-        holder.itemSubSettingBinding.layoutRemove.isVisible = subId != AppConfig.DEFAULT_SUBSCRIPTION_ID
 
         holder.itemSubSettingBinding.chkEnable.setOnCheckedChangeListener { it, isChecked ->
             if (!it.isPressed) return@setOnCheckedChangeListener

V2rayNG/app/src/main/java/com/v2ray/ang/viewmodel/MainViewModel.kt

@@ -252,9 +252,7 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
         }
 
         val groups = mutableListOf<GroupMapItem>()
-        if (subscriptions.size > 1
-            && MmkvManager.decodeSettingsBool(AppConfig.PREF_GROUP_ALL_DISPLAY)
-        ) {
+        if (MmkvManager.decodeSettingsBool(AppConfig.PREF_GROUP_ALL_DISPLAY)) {
             groups.add(
                 GroupMapItem(
                     id = "",

V2rayNG/app/src/main/java/com/v2ray/ang/viewmodel/SubscriptionsViewModel.kt

@@ -21,7 +21,7 @@ class SubscriptionsViewModel : ViewModel() {
     fun remove(subId: String): Boolean {
         val changed = subscriptions.removeAll { it.guid == subId }
         if (changed) {
-            MmkvManager.removeSubscription(subId)
+            SettingsManager.removeSubscriptionWithDefault(subId)
             SettingsChangeManager.makeSetupGroupTab()
         }
         return changed