Error failed to launch emulator reason could not start emulator within 30 seconds

My answer is, If you have changed the directory of avds, you should set ANDROID_SDK_HOME environment variable to the parent directory of .android.

Here is the detail:
It seems like when you run «emulator -list-avds» in cmd, the result is empty. (be sure to first add «ANDROID_HOME» with value of your sdk directory to your user environment variable, and «%ANDROID_HOME%emulator» in the Path too.)

After checking the official documents:
https://developer.android.com/studio/run/emulator-commandline#starting
It said:
«$ emulator -list-avds

When you use this option, it displays a list of AVD names from your Android home directory. Note that you can override the default home directory by setting the ANDROID_SDK_HOME environment variable: the root of the user-specific directory where all configuration and AVD content is stored. You could set the environment variable in the terminal window before launching a virtual device, or you could set it through your user settings in the operating system.»

and in another page:
https://developer.android.com/studio/command-line/variables#envar
it said:
«Some older tools, such as Android Studio 4.3 and below, do not read ANDROID_USER_HOME. To override the user preferences location for those older tools set ANDROID_SDK_HOME to the parent directory you would like the .android directory to be created under.»

So I guess the reason is «npx react-native run-android» will invoke «emulator -list-avds» to find the emulator. And «emulator» is really an older tools, so ANDROID_SDK_HOME environment variable is necessary.

And if all goes well, you really don’t need to run android studio before run «npx reactive-native run-android».

yarn run v1.22.10
$ react-native run-android
info Running jetifier to migrate libraries to AndroidX. You can disable it using "--no-jetifier" flag.
Jetifier found 1755 file(s) to forward-jetify. Using 8 workers...
info Starting JS server...
info Launching emulator...
error Failed to launch emulator. Reason: Could not start emulator within 30 seconds..
warn Please launch an emulator manually or connect a device. Otherwise app may fail to launch.
info Installing the app...

error Failed to install the app. Make sure you have the Android development environment set up: https://reactnative.dev/docs/environment-setup. Run CLI with --verbose flag for more details.
Error: spawn ./gradlew EACCES
    at Process.ChildProcess._handle.onexit (node:internal/child_process:282:19)
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

3 ответа

export ANDROID_HOME=$HOME/Library/Android/sdk
export PATH=$PATH:$ANDROID_HOME/emulator
export PATH=$PATH:$ANDROID_HOME/tools
export PATH=$PATH:$ANDROID_HOME/tools/bin
export PATH=$PATH:$ANDROID_HOME/platform-tools

chmod 755 android/gradlew

npx react-native run-android

Issue

I can’t launch my Android simulator. I have Android Studio installed as well as a couple of simulators. Any help appreciated!

error Failed to launch emulator. Reason: No emulators found as an output of `emulator -list-avds`.
warn Please launch an emulator manually or connect a device. Otherwise app may fail to launch.
info Installing the app...
The operation couldn’t be completed. Unable to locate a Java Runtime.
Please visit http://www.java.com for information on installing Java.


error Failed to install the app. Make sure you have the Android development environment set up: https://reactnative.dev/docs/environment-setup.
Error: Command failed: ./gradlew app:installDebug -PreactNativeDevServerPort=8081
The operation couldn’t be completed. Unable to locate a Java Runtime.
Please visit http://www.java.com for information on installing Java.

Solution

you have to set the environment variable in your mac system.

export ANDROID_HOME=$HOME/Library/Android/sdk
export PATH=$PATH:$ANDROID_HOME/emulator
export PATH=$PATH:$ANDROID_HOME/tools
export PATH=$PATH:$ANDROID_HOME/tools/bin
export PATH=$PATH:$ANDROID_HOME/platform-tools
copy those texts
type nano ~/.zshrc in mac terminal
source ~/.zshrc
paste copied texts
To save it, hit Ctrl + X, type Y to save, and then enter to keep the file name as it is.

Answered By — Bhavin Parghi
Answer Checked By — Terry (JavaFixing Volunteer)

can’t compile and run my react native app #25936

I just can’t compile and run my react native app, and I’m getting this message :

FAILURE: Build failed with an exception.

Where:
Script ‘C:UsersmeReactNativeMyAppnode_modules@react-native-communitycli-platform-androidnative_modules.gradle’ line: 190

What went wrong:
A problem occurred evaluating settings ‘MyApp’.

Unable to determine the current character, it is not a string, number, array, or object

The current character read is ‘E’ with an int value of 69
Unable to determine the current character, it is not a string, number, array, or object
line number 1
index number 0.

React Native version:

Steps To Reproduce

Describe what you expected to happen:

Snack, code example, screenshot, or link to a repository:

The text was updated successfully, but these errors were encountered:

I finally found the solution, something I was quite sure about doing, but thanks to this this guy #24733 (comment) :I had to delete «appbuildintermediatessigning_configdebugoutsigning-config.json» and now it works.

thanks, you just saved my ass in the nick of a meeting

hi, i’m facing this problem and its weird cause it happened when i created a new project with react-native init two days ago. i can run the old project but when i try to use command react-native run-android in the new project it gives me an error.( i don’t even have a build folder to delete ((: )
System:
OS: Windows 10
CPU: (8) x64 Intel(R) Core(TM) i7-2670QM CPU @ 2.20GHz
Memory: 2.20 GB / 7.95 GB
Binaries:
Node: 8.11.3 — C:Program Filesnodejsnode.EXE
npm: 5.6.0 — C:Program Filesnodejsnpm.CMD
IDEs:
Android Studio: Version 3.5.0.0 AI-191.8026.42.35.5791312
npmPackages:
react: 16.9.0 => 16.9.0
react-native: 0.61.2 => 0.61.2

info Running jetifier to migrate libraries to AndroidX. You can disable it using «—no-jetifier» flag.
Jetifier found 863 file(s) to forward-jetify. Using 8 workers.
info Starting JS server.
‘C:Program’ is not recognized as an internal or external command,
operable program or batch file.
info Launching emulator.
‘C:Program’ is not recognized as an internal or external command,
operable program or batch file.
error Failed to launch emulator. Reason: Emulator exited before boot..
warn Please launch an emulator manually or connect a device. Otherwise app may fail to launch.
info Installing the app.

FAILURE: Build failed with an exception.

Where:
Script ‘C:UsersomidazmDesktopweblearningreact-nativegreen26node_modules@react-native-communitycli-platform-androidnative_modules.gradle’ line: 182

What went wrong:
A problem occurred evaluating script.

Unable to determine the current character, it is not a string, number, array, or object

Try:
Run with —stacktrace option to get the stack trace. Run with —info or —debug option to get more log output. Run with —scan to get full insights.

BUILD FAILED in 23s

error Failed to install the app. Make sure you have the Android development environment set up: https://facebook.github.io/react-native/docs/getting-started.html#android-development-environment. Run CLI with —verbose flag for more details.
Error: Command failed: gradlew.bat app:installDebug -PreactNativeDevServerPort=8081

FAILURE: Build failed with an exception.

Where:
Script ‘C:UsersomidazmDesktopweblearningreact-nativegreen26node_modules@react-native-communitycli-platform-androidnative_modules.gradle’ line: 182

What went wrong:
A problem occurred evaluating script.

Unable to determine the current character, it is not a string, number, array, or object

Try:
Run with —stacktrace option to get the stack trace. Run with —info or —debug option to get more log output. Run with —scan to get full insights.

BUILD FAILED in 23s

hi, i’m facing this problem and its weird cause it happened when i created a new project with react-native init two days ago. i can run the old project but when i try to use command react-native run-android in the new project it gives me an error.( i don’t even have a build folder to delete ((: )
System:
OS: Windows 10
CPU: (8) x64 Intel(R) Core(TM) i7-2670QM CPU @ 2.20GHz
Memory: 2.20 GB / 7.95 GB
Binaries:
Node: 8.11.3 — C:Program Filesnodejsnode.EXE
npm: 5.6.0 — C:Program Filesnodejsnpm.CMD
IDEs:
Android Studio: Version 3.5.0.0 AI-191.8026.42.35.5791312
npmPackages:
react: 16.9.0 => 16.9.0
react-native: 0.61.2 => 0.61.2

info Running jetifier to migrate libraries to AndroidX. You can disable it using «—no-jetifier» flag.
Jetifier found 863 file(s) to forward-jetify. Using 8 workers.
info Starting JS server.
‘C:Program’ is not recognized as an internal or external command,
operable program or batch file.
info Launching emulator.
‘C:Program’ is not recognized as an internal or external command,
operable program or batch file.
‘C:Program’ is not recognized as an internal or external command,
operable program or batch file.
‘C:Program’ is not recognized as an internal or external command,
operable program or batch file.
‘C:Program’ is not recognized as an internal or external command,
operable program or batch file.
‘C:Program’ is not recognized as an internal or external command,
operable program or batch file.
‘C:Program’ is not recognized as an internal or external command,
operable program or batch file.
error Failed to launch emulator. Reason: Emulator exited before boot..
warn Please launch an emulator manually or connect a device. Otherwise app may fail to launch.
info Installing the app.

FAILURE: Build failed with an exception.

• Where:
  Script ‘C:UsersomidazmDesktopweblearningreact-nativegreen26node_modules@react-native-communitycli-platform-androidnative_modules.gradle’ line: 182
• What went wrong:
  A problem occurred evaluating script.

Unable to determine the current character, it is not a string, number, array, or object

• Try:
  Run with —stacktrace option to get the stack trace. Run with —info or —debug option to get more log output. Run with —scan to get full insights.
• Get more help at https://help.gradle.org

BUILD FAILED in 23s

error Failed to install the app. Make sure you have the Android development environment set up: https://facebook.github.io/react-native/docs/getting-started.html#android-development-environment. Run CLI with —verbose flag for more details.
Error: Command failed: gradlew.bat app:installDebug -PreactNativeDevServerPort=8081

FAILURE: Build failed with an exception.

• Where:
  Script ‘C:UsersomidazmDesktopweblearningreact-nativegreen26node_modules@react-native-communitycli-platform-androidnative_modules.gradle’ line: 182
• What went wrong:
  A problem occurred evaluating script.

Unable to determine the current character, it is not a string, number, array, or object

• Try:
  Run with —stacktrace option to get the stack trace. Run with —info or —debug option to get more log output. Run with —scan to get full insights.
• Get more help at https://help.gradle.org

BUILD FAILED in 23s

same problem here i just ran the react-native run-android after i init the project

Источник

Не удалось запустить эмулятор. Причина: эмулятор завершился до загрузки в React Native, когда реагирует на собственный запуск-android

Я устанавливаю React Native в соответствии с этим сайтом https://medium.com/@leonardobrunolima/react-native-tips-setting-up-your-development-environment-for-windows-d326635604ea , это очень полезно, пока я не запустил команду react-native run-android , это ошибка, которую я получаю:

У меня версия узла 10, и я работаю в Windows, пожалуйста, помогите, спасибо.

1. Проверьте свою конфигурацию и настройку среды с помощью инструкций здесь , будьте очень осторожны с настройками путей. Проверьте $ PATH в терминале IDE.
2. проверьте в AVD, что определенная ОС Android выбрана и установлена ​​для используемого вами виртуального устройства (в моем случае этого не было, у меня был желтый восклицательный знак предупреждения в столбце «Действия» в списке устройств AVD).
3. Обновите Gradle до версии не ниже 6.6 в

1. В Ubuntu после запуска мне приходилось «нажимать» кнопку включения на виртуальном устройстве.

Наконец, я запустил его как в Windows 10, так и в Ubuntu 20.04 LTS с Android 30.

В моем случае мне нужно стереть данные на виртуальном устройстве. Android Studio -> AVD -> Действия (↓) -> Wipe Data

Я столкнулся с аналогичной проблемой при выполнении моего собственного кода реакции на физическом устройстве Android. Не уверен, поможет ли мое решение.

Все мы знаем, что ADB требует авторизации от устройства Android для связи с ним. Только разрешив отладку по USB и проверив отпечаток ключа RSA компьютера, мы позволяем демону ADB подключаться к нашему телефону и управлять им. Это функция безопасности.

Мой телефон был подключен к USB, и при изменении конфигурации USB на устройстве мой телефон выдал мне еще один запрос: «Разрешить отладку по USB?». Изображение доступно для справки . У меня есть решение по отладке reallow USB

Источник

Failed to launch emulator. Reason: No emulators found as an output of emulator -list-avds #29617

After I run the project flutter, running the react_native project won’t connect to the simulator.
Failed to launch emulator. Reason: No emulators found as an output of emulator -list-avds
why?How to solve.

The text was updated successfully, but these errors were encountered:

Please stop posting these issues on facebook/react-native .
It has nothing to do with this library!

Getting same error : error Failed to install the app. Make sure you have the Android development environment set up: https://reactnative.dev/docs/environment-setup. Run CLI with —verbose flag for more details.
Error: Command failed: ./gradlew app:installDebug -PreactNativeDevServerPort=8081

React native Info:
Node: 12.18.4 — /usr/local/bin/node
Yarn: Not Found
npm: 6.14.8 — /usr/local/bin/npm
Watchman: 4.9.0 — /usr/local/bin/watchman
Managers:
CocoaPods: 1.9.3 — /usr/local/bin/pod
SDKs:
iOS SDK:
Platforms: iOS 14.0, DriverKit 19.0, macOS 10.15, tvOS 14.0, watchOS 7.0
Android SDK: Not Found
IDEs:
Android Studio: 4.0 AI-193.6911.18.40.6626763
Xcode: 12.0/12A7209 — /usr/bin/xcodebuild
Languages:
Java: javac 15 — /usr/bin/javac
Python: 2.7.16 — /usr/bin/python
npmPackages:
@react-native-community/cli: Not Found
react: 16.13.1 => 16.13.1
react-native: 0.63.2 => 0.63.2
react-native-macos: Not Found
npmGlobalPackages:
react-native: Not Found

My answer is, If you have changed the directory of avds, you should set ANDROID_SDK_HOME environment variable to the parent directory of .android.

Here is the detail:
It seems like when you run «emulator -list-avds» in cmd, the result is empty. (be sure to first add «ANDROID_HOME» with value of your sdk directory to your user environment variable, and «%ANDROID_HOME%emulator» in the Path too.)

When you use this option, it displays a list of AVD names from your Android home directory. Note that you can override the default home directory by setting the ANDROID_SDK_HOME environment variable: the root of the user-specific directory where all configuration and AVD content is stored. You could set the environment variable in the terminal window before launching a virtual device, or you could set it through your user settings in the operating system.»

and in another page:
https://developer.android.com/studio/command-line/variables#envar
it said:
«Some older tools, such as Android Studio 4.3 and below, do not read ANDROID_USER_HOME. To override the user preferences location for those older tools set ANDROID_SDK_HOME to the parent directory you would like the .android directory to be created under.»

So I guess the reason is «npx react-native run-android» will invoke «emulator -list-avds» to find the emulator. And «emulator» is really an older tools, so ANDROID_SDK_HOME environment variable is necessary.

And if all goes well, you really don’t need to run android studio before run «npx reactive-native run-android».

So I guess the reason is «npx react-native run-android» will invoke «emulator -list-avds» to find the emulator. And «emulator» is really an older tools, so ANDROID_SDK_HOME environment variable is necessary.

Yes that’s exactly the case. Thanks for your thorough explanation @akaigyouhou.

Closing as the issue is not necessarily related to React Native, but more to your Android SDK setup. If you manage to call emulator -list-avds and get a valid result in your terminal, then run-android will also work.

Источник

Won’t find Android studio emulator. #1

am running your app on an android studio emulator and it looks like this demo can’t find it!

Whenever I run react-native run-android it gives error

My emulator is up and other projects can use it and install apps normally.

The text was updated successfully, but these errors were encountered:

@maotora You may specify which emulator to run on like ..
react-native run-android —deviceId emulator-5554

To get list of emulators run
adb devices -l

Thanks for replying.

I tried your method unfortunately still fails.

The problem is not that it cant find the Android Emulator, There’s an error in compiling your projects, have you linked your dependencies well ?

Hi @aivene25 ,
Thank you for your response but it still doesn’t work.

I re-cloned the project, then ran yarn then react-native link then ran yarn again then npm run start and lastly react-native run android still same issue.

Facing the same issue, any fix yet?

Hi, this might resolve the issue —

1. Just run sudo chmod -R 777 react-native-track-player-demo(Project Name) after that
2. npm install
3. react-native link
4. react-native run android

I didn’t work, sadly.

This repo is not active for last couple of months.
Try the new example Instead.

I tried your solution and it gave a different error.

⚠️ long stacktrace ahead.

I can see some light in this, do you have any solutions to this issue?

Now I feel stupid..

Ran npm install & react-native link

Ran react-native run-android

Gets a different error.

@moonstruck that’s the only branch I have.

@maotora Open emulator and try this
git clone https://github.com/react-native-kit/react-native-track-player.git
git checkout dev
cd example
yarn install
react-native run-android

Hey, is the dev branch still working?

info Running jetifier to migrate libraries to AndroidX. You can disable it using «—no-jetifier» flag.
Jetifier found 959 file(s) to forward-jetify. Using 2 workers.
info Starting JS server.
info Launching emulator.
error Failed to launch emulator. Reason: No emulators found as an output of emulator -list-avds .
warn Please launch an emulator manually or connect a device. Otherwise app may fail to launch.
info Installing the app.

every run my project always appear error like that
do you can handle my problem?

I found that specifically adding the emulator path (and in fact the platform-tools) folders to my PATH environment variable, those issues go away. Why it doesn’t append to the ANDROID_SDK_ROOT environment variable in Windows I’m not sure.

Hi Guys, if anyone still has this issue. An easy fix is just to open the ‘android‘ folder from your react-native project in android studio and build directly from there. None of the other solutions above worked for me. however this worked straight away.

Hi Guys, if anyone still has this issue. An easy fix is just to open the ‘android‘ folder from your react-native project in android studio and build directly from there. None of the other solutions above worked for me. however this worked straight away.

where did you build? I dont have a build button when I go into Android studio -> Android folder.

Hi Guys, if anyone still has this issue. An easy fix is just to open the ‘android‘ folder from your react-native project in android studio and build directly from there. None of the other solutions above worked for me. however this worked straight away.

where did you build? I dont have a build button when I go into Android studio -> Android folder.

Make sure you’re opening the build.gradle file found in the /android directory in your react-native app folder when opening in Android Studio. Then you should be able to press the green ‘play’ button at the top of Android Studio. If this doesn’t work make sure you’ve opened the emulator first and have it selected in the dropdown menu next to the ‘play’ button. Hope this helps 🙂

Flutter is able to detect open emulator, but react-native is not able to.
Facing same issue as others are facing it here.
What’s the final call for resolution?

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