Add locate FAB and scroll-to-selected server

https://github.com/2dust/v2rayNG/issues/5165

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

@@ -280,4 +280,38 @@ class GroupServerFragment : BaseFragment<FragmentGroupServerBinding>(),
         ownerActivity.importConfigViaSub()
         binding.refreshLayout.isRefreshing = false
     }
+
+    /**
+     * Scrolls to the currently selected server in the RecyclerView
+     */
+    fun scrollToSelectedServer() {
+        val selectedGuid = MmkvManager.getSelectServer()
+        if (selectedGuid.isNullOrEmpty()) {
+            ownerActivity.toast(R.string.title_file_chooser)
+            return
+        }
+
+        // Find the position of the selected server
+        val serversCache = mainViewModel.serversCache
+        val position = serversCache.indexOfFirst { it.guid == selectedGuid }
+        val recyclerView = binding.recyclerView
+
+        if (position >= 0) {
+            // Get the layout manager
+            val layoutManager = recyclerView.layoutManager as? GridLayoutManager
+
+            if (layoutManager != null) {
+                // Scroll to position with offset to center it on screen
+                // First scroll to position, then adjust to center
+                recyclerView.post {
+                    layoutManager.scrollToPositionWithOffset(position, recyclerView.height / 3)
+                }
+            } else {
+                // Fallback to smooth scroll if layout manager is not GridLayoutManager
+                recyclerView.smoothScrollToPosition(position)
+            }
+        } else {
+            ownerActivity.toast(R.string.toast_server_not_found_in_group)
+        }
+    }
 }

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

@@ -94,6 +94,7 @@ class MainActivity : HelperBaseActivity(), NavigationView.OnNavigationItemSelect
         })
 
         binding.fab.setOnClickListener { handleFabAction() }
+        binding.fabLocate.setOnClickListener { locateSelectedServer() }
         binding.layoutTest.setOnClickListener { handleLayoutTestClick() }
 
         setupGroupTab()
@@ -569,6 +570,47 @@ class MainActivity : HelperBaseActivity(), NavigationView.OnNavigationItemSelect
         }
     }
 
+    /**
+     * Locates and scrolls to the currently selected server.
+     * If the selected server is in a different group, automatically switches to that group first.
+     */
+    private fun locateSelectedServer() {
+        val targetSubscriptionId = mainViewModel.findSubscriptionIdBySelect()
+        if (targetSubscriptionId.isNullOrEmpty()) {
+            toast(R.string.title_file_chooser)
+            return
+        }
+
+        val targetGroupIndex = groupPagerAdapter.groups.indexOfFirst { it.id == targetSubscriptionId }
+        if (targetGroupIndex < 0) {
+            toast(R.string.toast_server_not_found_in_group)
+            return
+        }
+
+        // Switch to target group if needed, then scroll to the server
+        if (binding.viewPager.currentItem != targetGroupIndex) {
+            binding.viewPager.setCurrentItem(targetGroupIndex, true)
+            binding.viewPager.postDelayed({ scrollToSelectedServer(targetGroupIndex) }, 1000)
+        } else {
+            scrollToSelectedServer(targetGroupIndex)
+        }
+    }
+
+    /**
+     * Scrolls to the selected server in the specified fragment.
+     * @param groupIndex The index of the group/fragment to scroll in
+     */
+    private fun scrollToSelectedServer(groupIndex: Int) {
+        val itemId = groupPagerAdapter.getItemId(groupIndex)
+        val fragment = supportFragmentManager.findFragmentByTag("f$itemId") as? GroupServerFragment
+
+        if (fragment?.isAdded == true && fragment.view != null) {
+            fragment.scrollToSelectedServer()
+        } else {
+            toast(R.string.toast_fragment_not_available)
+        }
+    }
+
     override fun onKeyDown(keyCode: Int, event: KeyEvent): Boolean {
         if (keyCode == KeyEvent.KEYCODE_BACK || keyCode == KeyEvent.KEYCODE_BUTTON_B) {
             moveTaskToBack(false)

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

@@ -402,6 +402,17 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
         reloadServerList()
     }
 
+    fun findSubscriptionIdBySelect(): String? {
+        // Get the selected server GUID
+        val selectedGuid = MmkvManager.getSelectServer()
+        if (selectedGuid.isNullOrEmpty()) {
+            return null
+        }
+
+        val config = MmkvManager.decodeServerConfig(selectedGuid)
+        return config?.subscriptionId
+    }
+
     fun onTestsFinished() {
         viewModelScope.launch(Dispatchers.Default) {
             if (MmkvManager.decodeSettingsBool(AppConfig.PREF_AUTO_REMOVE_INVALID_AFTER_TEST)) {

V2rayNG/app/src/main/res/layout/activity_main.xml

@@ -96,6 +96,18 @@
                     android:layout_gravity="bottom|end"
                     android:layout_marginEnd="@dimen/padding_spacing_dp16">
 
+                    <com.google.android.material.floatingactionbutton.FloatingActionButton
+                        android:id="@+id/fab_locate"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:layout_gravity="bottom|end"
+                        android:layout_marginBottom="@dimen/view_height_dp120"
+                        android:clickable="true"
+                        android:contentDescription="@string/title_server"
+                        android:focusable="true"
+                        android:src="@android:drawable/ic_menu_mylocation"
+                        app:layout_anchorGravity="bottom|right|end" />
+
                     <com.google.android.material.floatingactionbutton.FloatingActionButton
                         android:id="@+id/fab"
                         android:layout_width="wrap_content"

V2rayNG/app/src/main/res/values-ar/strings.xml

@@ -299,6 +299,8 @@
     <string name="title_update_config_count">Update %d configurations</string>
     <string name="title_update_subscription_result">Updated %1$d configs (%2$d success, %3$d failed, %4$d skipped)</string>
     <string name="title_update_subscription_no_subscription">No subscriptions</string>
+    <string name="toast_server_not_found_in_group">Selected server not found in current group</string>
+    <string name="toast_fragment_not_available">Unable to locate current view</string>
     <string name="tasker_start_service">بدء الخدمة</string>
     <string name="tasker_setting_confirm">تأكيد</string>
 

V2rayNG/app/src/main/res/values-bn/strings.xml

@@ -298,6 +298,8 @@
     <string name="title_update_config_count">Update %d configurations</string>
     <string name="title_update_subscription_result">Updated %1$d configs (%2$d success, %3$d failed, %4$d skipped)</string>
     <string name="title_update_subscription_no_subscription">No subscriptions</string>
+    <string name="toast_server_not_found_in_group">Selected server not found in current group</string>
+    <string name="toast_fragment_not_available">Unable to locate current view</string>
     <string name="tasker_start_service">সার্ভিস শুরু করুন</string>
     <string name="tasker_setting_confirm">নিশ্চিত করুন</string>
 

V2rayNG/app/src/main/res/values-bqi-rIR/strings.xml

@@ -299,6 +299,8 @@
     <string name="title_update_config_count">ورۊ کردن %d کانفیگ</string>
     <string name="title_update_subscription_result">%1$d کانفیگ ورۊ وابی (مووفق: %2$d، شکست خرده: %3$d، رڌ وابیڌه: %4$d)</string>
     <string name="title_update_subscription_no_subscription">بؽ اشتراک</string>
+    <string name="toast_server_not_found_in_group">Selected server not found in current group</string>
+    <string name="toast_fragment_not_available">Unable to locate current view</string>
     <string name="tasker_start_service">ره وندن خدمات</string>
     <string name="tasker_setting_confirm">قوۊل</string>
 

V2rayNG/app/src/main/res/values-fa/strings.xml

@@ -296,6 +296,8 @@
     <string name="title_update_config_count">آپدیت کردن %d کانفیگ</string>
     <string name="title_update_subscription_result">Updated %1$d configs (%2$d success, %3$d failed, %4$d skipped)</string>
     <string name="title_update_subscription_no_subscription">No subscriptions</string>
+    <string name="toast_server_not_found_in_group">Selected server not found in current group</string>
+    <string name="toast_fragment_not_available">Unable to locate current view</string>
     <string name="tasker_start_service">شروع خدمات</string>
     <string name="tasker_setting_confirm">تایید</string>
 

V2rayNG/app/src/main/res/values-ru/strings.xml

@@ -297,6 +297,8 @@
     <string name="title_update_config_count">Обновлено профилей: %d</string>
     <string name="title_update_subscription_result">Обновлено профилей: %1$d (успешно: %2$d, ошибок: %3$d, пропущено: %4$d)</string>
     <string name="title_update_subscription_no_subscription">Нет подписок</string>
+    <string name="toast_server_not_found_in_group">Selected server not found in current group</string>
+    <string name="toast_fragment_not_available">Unable to locate current view</string>
 
     <string name="tasker_start_service">Запуск службы</string>
     <string name="tasker_setting_confirm">Подтвердить</string>

V2rayNG/app/src/main/res/values-vi/strings.xml

@@ -299,6 +299,8 @@
     <string name="title_update_config_count">Update %d configurations</string>
     <string name="title_update_subscription_result">Updated %1$d configs (%2$d success, %3$d failed, %4$d skipped)</string>
     <string name="title_update_subscription_no_subscription">No subscriptions</string>
+    <string name="toast_server_not_found_in_group">Selected server not found in current group</string>
+    <string name="toast_fragment_not_available">Unable to locate current view</string>
     <string name="tasker_start_service">Khởi động v2rayNG</string>
     <string name="tasker_setting_confirm">Xác nhận</string>
 

V2rayNG/app/src/main/res/values-zh-rCN/strings.xml

@@ -297,6 +297,8 @@
     <string name="title_update_config_count">更新 %d 个配置</string>
     <string name="title_update_subscription_result">更新了 %1$d 个配置（%2$d 个成功，%3$d 个失败，%4$d 个跳过）</string>
     <string name="title_update_subscription_no_subscription">无订阅</string>
+    <string name="toast_server_not_found_in_group">当前分组中未找到选中的服务器</string>
+    <string name="toast_fragment_not_available">无法定位当前视图</string>
     <string name="tasker_start_service">启动服务</string>
     <string name="tasker_setting_confirm">确定</string>
 

V2rayNG/app/src/main/res/values-zh-rTW/strings.xml

@@ -297,6 +297,8 @@
     <string name="title_update_config_count">更新 %d 個配置</string>
     <string name="title_update_subscription_result">更新了 %1$d 個配置（%2$d 個成功，%3$d 個失敗，%4$d 個跳過）</string>
     <string name="title_update_subscription_no_subscription">無訂閱</string>
+    <string name="toast_server_not_found_in_group">當前分組中未找到選中的伺服器</string>
+    <string name="toast_fragment_not_available">無法定位當前視圖</string>
     <string name="tasker_start_service">啟動服務</string>
     <string name="tasker_setting_confirm">確定</string>
 

V2rayNG/app/src/main/res/values/dimens.xml

@@ -7,5 +7,6 @@
     <dimen name="view_height_dp36">36dp</dimen>
     <dimen name="view_height_dp48">48dp</dimen>
     <dimen name="view_height_dp64">64dp</dimen>
+    <dimen name="view_height_dp120">120dp</dimen>
     <dimen name="view_height_dp160">160dp</dimen>
 </resources>

V2rayNG/app/src/main/res/values/strings.xml

@@ -303,6 +303,8 @@
     <string name="title_update_config_count">Update %d configs</string>
     <string name="title_update_subscription_result">Updated %1$d configs (%2$d success, %3$d failed, %4$d skipped)</string>
     <string name="title_update_subscription_no_subscription">No subscriptions</string>
+    <string name="toast_server_not_found_in_group">Selected server not found in current group</string>
+    <string name="toast_fragment_not_available">Unable to locate current view</string>
 
     <string name="tasker_start_service">Start Service</string>
     <string name="tasker_setting_confirm">Confirm</string>