remove ShowTipKnownIssues & fix StartOrStopForegroundService

src/ST.Client.Android/Extensions/ContextExtensions.2.cs

@@ -18,20 +18,13 @@ namespace System
         {
             Intent intent = new(context, typeof(TService));
             intent.SetAction(startOrStop ? NativeService.START : NativeService.STOP);
-            if (startOrStop)
+            if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
             {
-                if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
-                {
-                    context.StartForegroundService(intent);
-                }
-                else
-                {
-                    context.StartService(intent);
-                }
+                context.StartForegroundService(intent);
             }
             else
             {
-                context.StopService(intent);
+                context.StartService(intent);
             }
         }
     }

src/ST.Client.Android/UI/Activities/ProxySettingsActivity.cs

@@ -178,10 +178,6 @@ namespace System.Application.UI.Activities
             {
                 IsVpnMode.Value = !IsVpnMode.Value;
                 SetIsVpnMode();
-                if (IsVpnMode.Value)
-                {
-                    CommunityFixFragment.ShowTipKnownIssues();
-                }
                 return;
             }
 

src/ST.Client.Android/UI/Fragments/CommunityFixFragment.cs

@@ -145,15 +145,6 @@ namespace System.Application.UI.Fragments
             }
         }
 
-        public static void ShowTipKnownIssues()
-        {
-            MessageBox.Show(string.Join(Environment.NewLine, new[] {
-                "VPN 模式不能正常工作",
-                "需要在 Wifi 或 流量 上手动设置代理地址，关闭时手动清除设置",
-                "Android 7+ 不信任用户证书",
-            }), "已知问题");
-        }
-
         void StartProxyButton_Click(bool start)
             => AndroidPlatformServiceImpl.StartOrStopForegroundService(
                 RequireActivity(), nameof(ProxyService), start);
@@ -163,13 +154,6 @@ namespace System.Application.UI.Fragments
             if (view.Id == Resource.Id.btnStartProxyService)
             {
                 StartProxyButton_Click(true);
-                const string KEY = "CommunityFixFragment_IsShowTip";
-                var isShowTip = Preferences2.Get(KEY, false);
-                if (!isShowTip)
-                {
-                    ShowTipKnownIssues();
-                    Preferences2.Set(KEY, true);
-                }
                 return true;
             }
             else if (view.Id == Resource.Id.btnStopProxyService)