Android 模拟器在 Visual Studio 2019 中首次启动时未显示在调试菜单中

Question

I have a weird problem going on with Android Emulators in Visual Studio 2019. Whenever I launch a new instance of VS2019 my emulator devices do not show up in the debug menu. The debug toolbar comes up with an empty list:

Although I have devices installed:

But when I go into SDK Manager and change something like installing or removing a new/existing SDK or tool, even the unrelated ones, the emulators suddenly start appearing in the list again:

And I can debug with no problems. But after this step if I close and re-launch Visual Studio or start a new instance without closing, everything goes back to step 1.

I've tried every solution I could find online and nothing seems to do the trick.

• My Visual Studio version: Microsoft Visual Studio Community 2019 Version 16.11.7
• I'm running VS as admin
• Android Emulator version: 31.1.4
• I also have Android Studio Installed ( I don't know if it has anything to do with this issue.)
• OS: Windows 10 Pro 19043.1348

Any help would be appreciated. Thank you.

Edit (12/17/2021 18:44 UTC):

I forgot to mention; Restart Adb Server option in VS > Tools > Android is always greyed out. Maybe somehow it is related to this issue.

UPDATE (12/19/2021 06:55 UTC)

---

@ToolmakerSteve: Here's my Android SDK location:

I also tried to change it to point to another folder and re-downloading all SDKs into the new folder. Unfortunately no change.

And I don't have anything related to ANDROID_HOME in Environment Variables . And I don't have C:\Users\Emre\AppData\Local\Android\Sdk folder in my system.

I also tried to uninstall VS and remove everything in the Android SDK folder and reinstall. But no change.

Answer 1

If you want to display the Android virtual machine you created in the Android Emulators menu, generally speaking, it can be recognized. If not recognized, you need to open the Android Device Manager first.

Select the device you want to run and click the Start button, so that the virtual machine can be started and detected, and then your virtual machine The device will be added to the Android Emulators menu.

Answer 2

This usually means a different version of "adb.exe" (the bridge between VS and emulator) is already running.

Things to try:

1. Sign out (or reboot pc), then sign in again. Run VS, open your project, wait several minutes. Does it find the devices? Hopefully once it has done it once, it will do better next time.

2. Task manager, show more details, find any adb.exe , End Task. If there are more than one, kill them all.

3. I don't think Android Studio interferes, unless you run it. If you do, you'll need to do either (1) or (2), so VS can use its own adb.exe .

4. Maybe check Task Manager / Startup - disable anything there that mentions Android or adb? Then reboot.

5. Wen xu Li's answer (start device via Android Device Manager) should always get you past this - though it won't permanently fix the situation.

Answer 3

Within Android Manifest, I had to lower the API versions from API Level 33 to API Level 30:

Then the emulators displayed in Visual Studio.