Windows phone emulator requires Hyper-V to run, but Android emulator in turn requires Intel Hardware Acceleration Manager (HAXM), which is intolerant to Hyper-V.
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This is probably the best work around:
http://blogs.msdn.com/b/virtual_pc_guy/archive/2008/04/14/creating-a-no-hypervisor-boot-entry.aspx
You keep two BCD entries referring to same Windows 10 partition, but one with Hyper-V activated (hypervisorlaunchtype Auto), and another one with Hyper-V suppressed (hypervisorlaunchtype Off). Still you have to reboot the system, but no need to install/uninstall Hyper-V, which is a significant relief.
A proposito, this article uses bcdedit which is a standard Windows command line utility. As an alternative, you can use a GUI application Visual BCD editor
You cannot disable Hyper-V without booting.
The only way to "remove" the Hyper-V below the Windows is restarting the machine.
Update to Windows 10 v1801 and April 2018 update and it will work. Windows now supports Android emulation using Hyper-V. Thanks to @JunleLi for the tip.
https://blogs.msdn.microsoft.com/visualstudio/2018/05/08/hyper-v-android-emulator-support/