这个错误非常普遍，这种症状可能是由于一百万个完全不同的问题中的任何一个造成的。 你要做的是找到更多关于正在发生的事情的信息，这样你就不会看起来像一只瞎鸡在啄食令人作呕的石头。 因此，让我们得到调试步骤:

first thing is to find the logs of Android studio. In doubt, stackoverflow already has a section to help you How to find the logs on android studio?. The text file should be named: "idea.log". You can open it with notepad, but only open it after android studio is closed (in windows 10). There will be a lot of events inside. Search by "manager.EmulatorProcessHandler" and the last date that you had the error. A good trick to facilitate your life, after having found the log file, is to close Android studio: delete the log file; reopen android studio and retry to open the emulator. The log file will be recreated with a lot less history and so it will be so much easier to search. In my case, i found: manager.EmulatorProcessHandler - Emulator: emulator: ERROR: Another emulator instance is running. Please close it or run all emulators with -read-only flag.. Given that, it is easy to solve. I just had to open a process manager and terminate the emu process that didn't correctly close for some unknown reason. Of course, in our case the log will be completely different. But now you have a clue of the hidden criminal.

我认为这是Android studio 2更新的问题或要解决的问题，请更新Android sdk版本，然后正常工作。

尽管这个问题是专门为Windows提出的，但我将为MacOS 11.4 Big Sur给出我的答案，因为这个线程是谷歌上搜索这个问题时的第一个热点，而且已经给出的答案都没有解决我的问题。

我在这里找到了问题的解决方案-出于保留的原因，我将重复详细的步骤:

打开终端，进入目录/Users/<username>/Library/Android/sdk/emulator/qemu/darwin-x86_64/ 创建一个名为entitled . XML的XML文件，内容如下:

<?xml version="1.0" encoding="UTF-8"?>
     <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" 
     "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
     <plist version="1.0">
     <dict>
         <key>com.apple.security.hypervisor</key>
         <true/>
     </dict>
     </plist>

退出模拟器

Codesign -s -——entitlement entitlement .xml——force qemu-system-x86_64

启动模拟器

这个错误非常普遍，这种症状可能是由于一百万个完全不同的问题中的任何一个造成的。 你要做的是找到更多关于正在发生的事情的信息，这样你就不会看起来像一只瞎鸡在啄食令人作呕的石头。 因此，让我们得到调试步骤:

first thing is to find the logs of Android studio. In doubt, stackoverflow already has a section to help you How to find the logs on android studio?. The text file should be named: "idea.log". You can open it with notepad, but only open it after android studio is closed (in windows 10). There will be a lot of events inside. Search by "manager.EmulatorProcessHandler" and the last date that you had the error. A good trick to facilitate your life, after having found the log file, is to close Android studio: delete the log file; reopen android studio and retry to open the emulator. The log file will be recreated with a lot less history and so it will be so much easier to search. In my case, i found: manager.EmulatorProcessHandler - Emulator: emulator: ERROR: Another emulator instance is running. Please close it or run all emulators with -read-only flag.. Given that, it is easy to solve. I just had to open a process manager and terminate the emu process that didn't correctly close for some unknown reason. Of course, in our case the log will be completely different. But now you have a clue of the hidden criminal.

我重新安装了Intel x86 Emulator Accelerator (HAXM安装程序)

在此之前，我尝试了很多方法，但只有一种有效:

配置->设置->外观和行为\系统设置\Android SDK -> SDK工具(选项卡)->取消选择“Intel x86 Emulator Accelerator (HAXM installer)”-> OK

现在，当你试图运行你的应用程序，或从AVD管理器启动设备时，它会给出“安装模拟器”错误->单击确定。这将自动下载新的“Intel x86 Emulator Accelerator (HAXM installer)”，我选择了512 RAM，它可以工作。

之后，我再次进行了所有这些处理，并选择了2 GB的RAM，它仍然工作。

检查模拟器安装驱动器的剩余空间是否大于5gb