[android] Waiting for Target Device to Come Online

I recently updated to Android Studio 2.3, and now when I try to run the application, the emulator does not come online. It times out after 300 seconds.

Additionally, The app has been experiencing a FATAL EXCEPTION ERROR (OOM), and I am not sure how to fix that either, or if that is part of the emulator problem.

Any help is much appreciated. Again, my knowledge in the program is very limited so if your answer can be kept simple, that would be great.

Finally, I solve this problem by setting the right export path in bash file:

export ANDROID_HOME=/Users/[username]/Library/Android/sdk

Check you don't have the deviced unauthorized, unauthorized devices reply the same error in the Android Studio, check the emulator once is on with the adb command.

$ adb devices

List of devices attached

emulator-5554 unauthorized

If you have of this way the emulator the Android Studio is waiting for be authorized and maybe this can solve the problem.

Authorized Devices

This is a error I have solved in Windows 10 with Android Studio 2.3.3

After trying all these solutions without success the one that fixed my problem was simply changing the Graphics configuration for the virtual device from Auto to Software (tried hardware first without success)

Question is too old but may be helpful to someone in future. After search many things, most of them is not worked for me. SO, as per my try This solution is worked for me. In short uninstall and install "Android SDK Tools" in Android SDK.

Few steps for that are below:-

1. go to "SDK Manager" in Android Studio
2. go to "SDK Tools" tab
3. Uninstall "Android SDK Tools" (means remove check(uncheck) ahead of "Android SDK Tools" and Apply then OK)
4. Close and Restart Android Studio
5. Install "Android SDK Tools" (means check ahead of "Android SDK Tools" and Apply then OK)

Image of Uninstall and Install Android SDK Tools again

I was having the same problem as you, android studio said I had Emulator 25.3.1 already installed

I deleted the Emulator folder (it's inside the SDK folder)

And then reinstalled Emulator 25.3.1 Sdk manager--> SDKtools --> instal the emulator 25.3.1

This time it worked :)

Make sure you have enabled USB debugging on your device

Depending on the version of Android you're using, proceed as follows:

• On Android 8.0 and higher, go to Settings > System > About phone and tap Build number seven times.
• On Android 4.2 through 7.1.2, go to Settings > About phone and tap Build number seven times.

Return to the main Settings menu to find Developer options at the bottom. In the Developer options menu, scroll down and enable USB debugging.

Did not read all the answers. Anyway Accepted one didn't work for me. What did was upgrading the android studio to last stable version and then created a new virtual device. I guess my nexus 5p virtual device got out of sync with the android studio environment.

Go to AVD Manager in your Android Studio.Right Click on your emulator,and then select wipe data.Then run your app again. The emulator will perform a clean boot and then install your apk then your app will finally run.

Summary:AVD Manager---Right Click Emulator----Wipe Data----Run App Again

If the problem presists,then simply go back to your avd manager ,uninstall emulator,then add a new emulator.Once the new emulator is added,in your avd manager,run the emulator...Then run your app. Its much simpler if you have an emulator already running from the onset before running your application for the first time

The problem is that there is no link between ide and the emulator.

In our case - we lowered version of android for the app, that frustrated ide in emulator linking.

If we install Android 25 and bind project to it, and AVD Device on Android 25 as well - it links and apllies changes on the fly. If we downgrade to Android 14 and device on android 14 - it doesn't.

Used Android Studio 2.3.

To play with versions you can set in Gradle Scripts - build.gradle (Module: app):

android {
  compileSdkVersion 25
  defaultConfig {
    minSdkVersion 15
    targetSdkVersion 15
  }
}

As a result app won't run on an Android 25 device with a message:

Installation failed with message Failed to finalize session : -26: Package ru.asv.test new target SDK 15 doesn't support runtime permissions but the old target SDK 25 does.. It is possible that this issue is resolved by uninstalling an existing version of the apk if it is present, and then re-installing.

WARNING: Uninstalling will remove the application data!

Go to terminal and type android avd. Select your AVD and select "Edit". Make sure you do not see No CPU/ABI system image available for this target - it will show in red font at the bottom. Change the target to the one that is available or download the ABI image. Sometimes, if you create an AVD from inside Android Studio, it does not ensure this requirement.

Seems that in my case the problem was in that the "Google APIs ARM EABI v7a System Image" wasn't automatically installed during installation of Android Studio.

After installing the image, the emulator began to work.

Screenshot of the SDK manager

Go to Run/Debug configuration -> General tab

Select blank device in Prefer Android Virtual Device combo box

Now every time when you run the app, it will run on the device already open. If no Device is running, it will throw error

I also ran into this problem and probably found the solution that may help. The key is launching the AVD in the emulator first then run your App.

Following are the steps:

1. In the Your Virtual Devices screen, select the device you just created and click Launch this AVD in the emulator
2. Once the emulator is booted up, click the app module in the Project window and then select Run → Run
3. In the Select Deployment Target window, select the emulator and click OK.

I am working on notebook, Windows 8. I solved this issue change mode from battery saving mode to balanced mode. Before that, an emulator didn't work and I see "Target Device to Come Online". Also didn't work Genymotion

Tools - Android - Sdk manager - tab Sdk tools - install emulator 25.3.1

I had this issue twice and tried everything in this thread with no results, I finally fixed it closing "BlueStacks" emulator.

If BlueStacks (and maybe others android emulators) are running when I run the app, by default Android Studio installs the app there, even when I never selected it as a device in AVD Manager, then Android Studio waits for an incorrect device "to come online".

Closing BlueStacks (or any other Android emulator) solved the conflict between devices for me.

I hope this info helps someone!

Seems like Android Studio (using version 3.5.1) gets into a weird state after a while. This worked for me.

File -> Invalidate Caches / Restart -> Invalidate and Restart

Fix for this issue is simple :

• Go to SDK tools > SDK Tools
• Check Android Emulator and click Apply

and sometimes you might see there's an update available next to it, you just need to let it finish the update

I've had the same problem (AVD not coming online) in a Linux system. In my case, I have solved it setting this environment variable:

$ export ANDROID_EMULATOR_USE_SYSTEM_LIBS = 1

This case is documented here: https://developer.android.com/studio/command-line/variables.html#studio_jdk

After trying almost all the solutions listed above, what finally worked for me was to create a new virtual device using a "Google APIs" image instead of a "Google Play" image.

Below steps work for me

1. Close running emulator
2. Go to AVD Manager
3. Choose available emulator
4. In that action tab (last one), click on drop down arrow & select COLD BOOT NOW
5. Finally run your application

Three days on this, and I believe there's a race condition between adb and the emulator. On a request to run an app, with no emulator already running, you see the "Initializing ADB", then the emulator choice, it starts and you get "Waiting for target to come online". An adb kill-server, or a kill -9, or an "End Process" of adb with the task manager will cause adb to die, restart, your APK installs and you're good to go. It does seem funky to me that an "adb kill-server" causes adb to die and then restart here, but that's another mystery, maybe.

Once again, please wait for a while, sometimes you missed that it actually worked but you are feeling really stressed and could not wait(I was).

Not sure why I fixed the same issue that happened on my Macbook, however, choose Nexus 5X API R would work somehow. OR below

1. Wipe Data: Tools->Open AVD Manager and click ? the emu "Wipe Data"

2. Cold Boots Now: Tools->Open AVD Manager and click ? the emu "Cold Boots Now"

3. Uninstall & Reinstall Android Emulator from SDK: Tools->Open SDK Manager->Android SDK(left-side menu)->SDK tools(middle in the main screen), then click "Android Emulator" and APPLY, then again click "Android Emulator" apply to reinstall, so finish

Following worked for me on Android Studio 3.x.

Step 1: Open AVD Manager.

Step 2: Right click and Wipe data for the virtual device you're testing on.

This solution works for me : Tools -> AVD Manager -> click drop down arrow -> select Cold Boot Now

1. Another case is Android Emulator should be reinstalled. This can happen, when you install a higher version of Android Studio, then update SDK for it, and go back to previous one.

   Tools - Android - SDK Manager - SDK Tools - Android Emulator - uncheck, apply, check, apply

2. Disable Docker app if you have it (Mac users).

3. Restart emulator:

   Tools - Android - AVD Manager (or kill adb process in task manager).

I discovered that having a running instance of Docker on my machine (OSX) prevented the Android Emulator from running (see Android Studio Unable to run AVD)

Previously, my emulator would appear to start, then fail before any device window was shown.

I also had to use 'kill -9' (as per @MarkDubya ) to get Android Studio to connect to the virtual device.

Like urupvog's answer, make sure that you aren't running any other virtual machines like VirtualBox. When I restarted my computer, AVD worked until I started Vagrant for backend development (then it wouldn't launch).

See Android emulator and virtualbox cannot run at same time for more info.

Go to the Sdk manager--> SDKtools --> instal the emulator 25.3.1

None of solutions above worked for me, so I had to wipe content of

C:\Users\your_name\.android\avd

and re-create emulated device

For Linux users using KVM and facing this problem try setting the Graphics option on the Android Virtual Device to Software instead of Automatic or Hardware . As previously mentioned in this answer.

I can confirm that the method works for Arch Linux, Ubuntu 16.04, as well as windows with or without a proprietary graphics card using Android Studio version 2.3.1+

In case you are on Mac, ensure that you exit Docker for Mac. This worked for me.

Probably if you haven't solved it yet ... the class name uses accented letters ...

I had a similar problem when updated my android studio. Somehow it changed my SDK path. I just changed it to my updated SDK path and it worked.

Android Studio -> File -> Settings -> Appearance & Behaviour -> System Settings -> Android SDK

Here you will find Android SDK location just click on edit link in front of that and browse and select the Android SDK from the file browser. Select and click on Apply.

Select AVD manager and start Emulator. This solution worked for me.