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Emulator: Unexpected feature list: MultiDisplay VulkanNullOptionalStrings YUV420888toNV21 YUVCache

My android emulator showing error & not opening.
If someone helped, I am very thankful.
Emulator: WARNING: unexpected system image feature string, emulator might not function correctly, please try updating the emulator.
Emulator: Unexpected feature list: MultiDisplay VulkanNullOptionalStrings YUV420888toNV21 YUVCache
Gradle build finished in 11 s 518 ms
ADB rejected shell command (getprop): closed
Emulator: Process finished with exit code -1073741819 (0xC0000005)

I had the same problem, you have to update your emulator in sdk manager:
1.launch sdk manager
2.settings->appearance and behavior->system settings->android sdk
3.SDK Tools
Update Android Emulator

I have Dell G5 5587 with Win10 and I have exactly same issue from yesterday morning. After some updates to Android studio emulator stop working and crash on start up. I was trying to install Android.Q (API 29) x86 and x86_64 versions everything without any success. I try to change GPU to auto, software, hardware, change amount of RAM and all with the same crash result.
Unfortunatelly I can't say what to do to resolve the issue but i try to install new Virtual Device with Android Pie (API 28) with default settings and it's working so at least I can continue with my work till issue is resolved.
Based on the error message I think it's connect somehow to graphic card itself (I have Nvidia Geforce MAXQ 1060) or graphic drivers (notice that nvidia control center icon suddenly disapper from startup icons).

This happened to me when I was trying to run the API 29 emulator with Hyper-V instead of HAXM. To work around it, I turned off Hyper-V and installed HAXM.

29 is partially installed and we can do nothing about it except to wait for the big update...

Android studio unable to run emulator: Process finished with exit code 2

I am trying to use an emulator in Android Studio 3.1.4, but I keep getting the error messages:
Emulator: Could not launch
'C:\Users\Ian\AppData\Local\Android\Sdk\emulator/qemu/windows-x86_64/qemu-system-i386.exe':
No such file or directory.
and
Emulator: Process finished with exit code 2.
This happens with every device I am trying to emulate.
I tried increasing the RAM on the emulator, but it had no effect. Any insight into what my problem is would be great.

1)Lower your AVD Memory if it set to default try running below 600 MB RAM
2) Try reinstalling the Emulator sdk

This can be solved by the following step:
Please ensure "Windows Hypervisor Platform" is installed. If it's not installed, install it, restart your computer and you will be good to go.

ERROR: resizing partition e2fsck failed with exit code 8

I'm new to android studio. When I try to run my first programme in android studio on the emulator, I get this error.
I have searched through other comments and have also tried decreasing my build.gradle from 24.0.0 to 23.0.3 as shown below, but it still doesn't work. I'm running on Nexus 5X API 23.
android {
compileSdkVersion 24
buildToolsVersion "23.0.3"
}
The error shown is:
Cannot launch AVD in emulator.
Output:
emulator: WARNING: userdata partition is resized from 756 M to 800 M ERROR: resizing partition e2fsck failed with exit code 8
Hax is enabled
Hax ram_size 0x60000000
HAX is working and emulator runs in fast virt mode.
emulator: Listening for console connections on port: 5554
emulator: Serial number of this emulator (for ADB): emulator-5554

I had the same issue after updating Android SDK tools package to version 25.2.2. To fix the problem i've restarted Android SDK Manager and then created new virtual device instead of using the old one.

I know this is an "old" question, but the following command solved the problem for me:
./emulator -data /sdk/path/here/system-images/android-API/default/x86/userdata.img -avd your_avd_name
where API is the api level you want to use. I found that this is only needed for API<20
Note: I had that problem with libstdc++, so I had to use the LD_PRELOAD envvar. I removed it in the example, so for me, the complete command looks like this:
LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libstdc++.so.6 ./emulator -data /home/username/Android/Sdk/system-images/android-API/default/x86/userdata.img -avd Whatever

I ran into the same type of problem after installing an update to one the SDK platforms, except my output log contained more than complaints. It contained a possible solution to the problem. See the log below.
emulator: WARNING: userdata partition is resized from 769 M to 770 MERROR: resizing partition e2fsck failed with exit code 8
Hax is enabled
Hax ram_size 0x40000000
HAX is working and emulator runs in fast virt mode.
emulator: Listening for console connections on port: 5554
emulator: Serial number of this emulator (for ADB): emulator-5554
Your emulator is out of date, please update by launching Android Studio:
- Start Android Studio
- Select menu "Tools > Android > SDK Manager"
- Click "SDK Tools" tab
- Check "Android SDK Tools" checkbox
- Click "OK"
Emulator Android_Accelerated_x86_Nougat is running.
Waiting for emulator to be ready...
Solution 1: Update the SDK Tools
Open Android SDKs and Tools window.
Go to the Tools tab (the name of this tab has changed).
Expand the Android SDK Tools group and make sure you select the
latest available version.
Click Apply Changes.
Possible problem with this solution:
You may run into a new problem by following this solution. When you run the emulator it will do a cold boot and ask you for a decryption password. If you don't provide the right password, it will display a black screen and then tell you that the decryption failed.
So this did not work in my case, but your mileage may vary.
Solution 2: Factory reset the emulator
I don't use Android Studio. I use Xamarin with Visual Studio. Installing the Xamarin Device Manager and doing a factory reset of the emulator is what fixed the problem for me.
You should have a similar option if you are using Android Studio. But if you would like to, you can try downloading and installing the Xamarin Device Manager by Microsoft. It's an independent application that does not require installation of Visual Studio or Xamarin.

The misleading ERROR: resizing partition e2fsck failed with exit code 8 when starting an Android Virtual Device (AVD) can occur when you have an old version of Android SDK installed, but without the Android Studio. The old standalone graphical SDK Manager is deprecated as of SDK Tools v25.2.3 - running it does not report any errors, but does not properly update your Android SDK.
Use the new command line SDK Manager ./sdkmanager --update to properly update your Android SDK and the e2fsck failed with exit code 8 problem will be gone.
More information: How to update Android emulator without Android Studio?

WARNING: userdata partition is resized from 756 M to 800 M
For this warning set Internal Storage = 756 MB
error warning will be removed.

Change disk.dataPartition.size to 756M in:
~/.android/avd/your_avd_name.avd/config.ini

I had the same issue, and tried everything that is suggested above, without success.
Being desperate, I tried every menu I could find in AVD. So, I came on "show on disk" menu, at the right of the line of my device, in AVD device list.
Android Studio opened an explorer window, and showed me a directory with a name not matching my device name... Probably because I had renamed my device in AVD, and Android Studio had not reported this change on disk.
So I deleted my device, created a new one with same parameters, verified that directory and name matched, and launched the device... and it worked!!!
Hope this will be helpfull to anyone...

None of the answers here solved my issue, but I did find this after searching for a while and it solved my issue. If all else fails, check out the answer here:
Emulator: ERROR: resizing partition e2fsck failed with exit code 1

Android Studio can't connect to AVD or real device

My Android Studio version is 2.1.2 in Windows 10. there is no problem before, but today this occurred. And I can not debug my app.
How to solve ?
emulator: WARNING: VM heap size set below hardware specified minimum of 384MB
emulator: WARNING: Setting VM heap size to 384MB
And
emulator: WARNING: ./android/metrics/metrics_reporter_toolbar.cpp:164: Can't upload usage metrics: Error
Run
Event Log

go to tools-->android-->avd manager
edit android virtual device and select show advanced settings
go to memory and storage and set VM heap 400MB
click finish and run avd

Do you see any errors? Try to
adb kill-server

Connect only one device through usb, close all the running emulators. Now run the project. It would show the device to run. Later start emulator and run the app, this time the emulator also would be shown to run the app.
This happened to me also, I have resolved in the above said way.

emulator-x86.exe has stopped working

I am getting these error at console.
hax is not working and emulator runs in emulation mode eclipse.
So I am unable to run the app in emulator.

After spending a lot of time,I am come up with the answer.
If you are getting emulator-x86.exe has stopped working Error means:
Try these two steps:
Change the resolution of the device 1280X800 to 800X600.
Reduce the size of the Ram by 512 MB or less.
If you are getting Hax is not working Error means:
Try these three steps:
1.Hax software would be located
in
C:\Program
Files\Android\android-sdk\extras\intel\Hardware_Accelerated_Execution_Manager
Install the HAXM Driver by running "IntelHaxm.exe" in command Prompt.
2.. if the installer fails with message that Intel VT must be turned on,
you need to enable this in BIOS.
For Eg:
if You are using windows 7, press F12 key to enter into bios setting.
There you can see the Intel Virtualization Technology placed in System Performance.Turn it on as enabled
3.Then again run the "IntelHaxm.exe" in command Prompt.Everything will be works fine.

In Android Studio, AVD Manager, edit the AVD you want and disable Use Host GPU under Emulated Performance. This eliminated this problem for me.

In my case, I solved this by un-selecting Multi-Core CPU.