Develop Reference

Android Emulator simply will not load

I am using Android Studio on a Ubuntu virtual machine.
I not yet got to the point where I am debugging my code. I am only trying to launch the emulator in Android Studio. After learned that my computer could not handle a high resolution emulators, I picked the appropriate ARM image. But when I launched the device from teh Device Manager, I could see that it seemed the emulator was trying to load but it stopped after just a few seconds with this error.
Logcat is, of coure empty. I have not even gotten to the point where I am debugging code.

I am using Windows OS and when I get this error, I open the task manager, find the qemu-system-x86_64.exe process and kill it.
You can do something like this in Ubuntu.

How to fix avd emulator process killed?

I am new to Android Development and I ran across this issue while building Flutter apps.
Every time I try to run a previously initialized Android Virtual Device I get a dialogue box saying: "Emulator process for AVD{name} was killed."
What Happens:
AVD runs fine if I create a fresh device. It runs fine.
If I restart my computer and run the AVD again, it starts to show the error.
If I close AVD and android studio and re-run the AVD without restarting, it runs fine.
I checked the logs and here is what I found:
Emulator: Failed to open /qemu.conf, err: 2
I have enough space in my disk, so that cannot be the issue.
If it matters I have Valorant installed and there is a dialogue box saying that it is not compatible with android studio. I have it set to disabled on startup so I don't think Volarant is an issue.

I found out the issue.
Apparently setting the navigation method of the AVD to gesture causes this problem. If it is set to 3 button navigation, the issue is fixed.

I am not able to start my AVD or Emulator in android Studio

While running Emulator its shows Emulator was Killed.
In Activity Log I can see an error named as:
"Emulator: Process finished with exit code -1073741515 (0xC0000135)"
I have tried---->
To clean/wipe and cold reset
Even I have tried by creating a new Emulator with RAM size 4 Gb also. But still, I faced the same problem which I had encountered earlier.
My IDE and SDK are updated.
I had also tried to configure my AVD's Graphics from Automatic to Software-GLS 2.0 but that doesn't work too.
But the same project can be run on my Android Phone.
My PC's Virtualisation is "Enabled"
Please Help me with that...

There's some suggestions in here about running the emulator from the command line, so you get some more useful info.
Since you mentioned RAM size, make sure you have enough local storage on the virtual device too - I've had a lot of problems where I've tried to keep it low (it'll be fine! I'm only installing one small app!) and the emulator misbehaves and won't run properly

Android Studio emulator appears in the task manager for 10 seconds and disappears. The emulator window is never displayed

It was working fine till I updated the Android SDK tools from the SDK Manager to version 24.1.2. However a virtual device was running at the time of the update and it asked me to close 3 processes in order for the update to continue. I thought the virtual device was interfering so I closed it and tried to proceed with the update,it gave me the same error. Therefore I cancelled the update and closed the studio. After restarting the studio,it gave an error saying the SDK could not be found and would not let me do anything else. I uninstalled the studio after deleting the SDK folder and reinstalled it. I downloaded the system images needed for the virtual devices and some other packages and created a new virtual device. When I tried to run the application,it gave me the dialogue box to chose the virtual device,I chose the newly created one and it gave the command to start the device. Yet no emulator window for the device appeared.
D:\sdk\tools\emulator.exe -netdelay none -netspeed full -avd MTK
emulator: device fd:5500
HAX is working and emulator runs in fast virt mode
HAXM is installed and it worked fine before. On checking the task manager upon launching the application,an emulator-x86.exe process appears briefly before disappearing. Nothing happens after that. Launching the program again gives the same result. If I try to launch the device from the AVD manager,I get the same result. I have tried using the arm images,varying the ram size,snapshot enabled/disabled,use HOST GPU enabled/disabled,system restarted,removal of /.android content,setting up the SDK in a different drive and deleting the ANDROID_SDK_HOME system variable and resetting it.
I have also tried with Genymotion. The virtual device window briefly appears and I can the see the android logo at startup but then it says "player.exe has encountered a problem and needs to close. We are sorry for the inconvenience." I have tried it using both the Genymotion Android SDK tools and the custom Android SDK tools to no avail. If I try to delete the device it says please stop the virtual device before deleting it even though it is not running.

I spent most of my day trying to solve exactly the same problem until one of my colleagues remembered he had exactly the same issue and that was related to Docker.
Docker uses Hypervisor Framework which is incompatible with the HAXM used by the Android emulator. Therefore if you try to run the Android emulator while Docker is running it will just quit without a warning. Quitting Docker will allow to use the simulator - Docker for Mac conflict with Android emulator

Sometimes it is because you are low on memory, or it might be an AVD specific glitch. I had many (20) devices saved in my AVD and was lower than normal on memory on my laptop. The native emulator folder would disappear right away but genymotion worked fine.
I removed the old devices and create a new one from scratch in AVD and the problem disappeared.

Android Studio emulator not running for hours

Android studio emulator doesn't run even if the run button was pressed for hours
Waiting for device.
"C:\Program Files\Android\android-studio\sdk\tools\emulator.exe" -avd MyAvd0 -netspeed full -netdelay none
appeared for hours.
It has not running since my second startup for the Android Studio. It faced the fatal error saying that the cache is blocked. After changing the permission of the user for adding full control access, it starts.I did add an sd card of 1024MB for the emulator before.The emulator still not starting up. I have even tried to uninstall and reinstall it
found this now in adb
DeviceMonitor: Adb connection Error:An existing connection was forcibly closed by the remote host
Starting emulator for AVD 'MyAvd0'
emulator: ERROR: Unable to load VM from snapshot. The snapshot has been saved for a different hardware configuration.

I'd highly encourage you to try Genymotion. You'll probably set it up faster than solving your avd issues, and in general terms, it works pretty much better.

It sounds like the Snapshot option is enabled for your VM, but you have changed it's config after the snapshot was saved. To fix this try the following:
Open the Android Virtual Device Manager
Select your AVD, then click the Edit button
In the dialog that shows, uncheck the Snapshot option (it is under Emulation Options).
Now try to start the emulator again.
Alternately, just open the Android Virtual Device Manager, delete the AVD, and create a new AVD.
Note:
As ssantos mentions, Genymotion is a fantastic emulator and I personally use it for my day-to-day testing. It is definitely worth checking out if you have the time :)

Check while creating the avd in Android Virtual Device Manager if there were any warnings, for me there was it said (paraphrasing) "for windows RAM size greater the 768 MB might cause problems in emulator". After making the RAM size 768 MB it worked and started immediately

I was also facing similar issue but there were no errors in my case, only the emulator keeped on starting but not displaying the home screen.
So I just Opened the AVD Manager then
Under Actions Tab
Click the Third Icon (pointing downwards), It will open the some options
Select Wipe Data
And you are Done :)