运行第一个可用的模拟器:

~/Library/Android/sdk/tools/emulator -avd `~/Library/Android/sdk/tools/emulator -list-avds | awk '{print $1}'`

(Linux) 在你的终端复制粘贴和改变三个蓝色的字段

/home/YouUser/Folder/adt-bundle-linux-x86_64-20140702/sdk/tools/emulator64-x86 -avd Android5.1.1

YouUser = user of session in linux
Folder = path of folfer
Android5.1.1 = You version of android in the emulator,for example (Android4.4.2)

你可以在你的文件夹home中查看模拟器 cd /home/Youuser/.android/avd/

我假设你已经构建了你的项目，只需要启动它，但你没有创建任何avd，必须使用命令行进行所有操作。你必须做以下事情。

Create a new virtual device (AVD) for the platform you need. If you have to use command line for creating your AVD, you can call android create avd -n <name> -t <targetID> where targetID is the API level you need. If you can use GUI, just type in android avd and it will launch the manager, where you can do the same. You can read more about AVD management through GUI and through command line. Run the AVD either by using command emulator -avd <name> or through previously launched GUI. Wait until the emulator fully loads, it takes some time. You can read about additional options here. Now you have to install the application to your AVD. Usually during development you just use the same Ant script you used to build the project, just select install target. However, you can install the application manually using command adb install <path-to-your-APK>. Now switch to emulator and launch your application like on any normal device, through the launcher. Or, as an alternative, you can use the following command: adb shell am start -a android.intent.action.MAIN -n <package>/<activity class>. For example: adb shell am start -a android.intent.action.MAIN -n org.sample.helloworld/org.sample.helloworld.HelloWorld. As a commenter suggested, you can also replace org.sample.helloworld.HelloWorld in the line above with just .HelloWorld, and it will work too.

列出所有模拟器:

emulator -list-avds

运行一个带-avd标志的模拟器:

emulator -avd name-of-your-emulator

模拟器可执行文件在下面:

${ANDROID_SDK}/tools/emulator

或者，对于更新的sdk，尝试:

cd ${ANDROID_HOME}/emulator
emulator -avd name-of-your-emulator

在这里补充一下，每当你得到“错误:设备离线”意味着与模拟器和adb桥接器的连接由于模拟器启动所花费的时间而中断。

而不是重新启动模拟器在这一点上，尝试以下两个命令停止&启动adb桥再次。

亚行kill-server 亚洲开发银行启动服务器

在windows中，我使用这个PowerShell脚本来启动它。

$em = $env:USERPROFILE+"\AppData\Local\Android\sdk\tools\emulator.exe"; 
Start-Process $em " -avd Nexus_5X_API_24" -WindowStyle Hidden;