android – React Native adb reverse ENOENT-ThrowExceptions

Exception or error:

I am trying to get React-Native to work with Android V4.2.2 (Genymotion) but I am unable to test the app on the Emulator. When I ran react-native run-android, I get this error Could not run adb reverse: spawnSync

Here is a log

JS server already running.
Running ~/Library/Android/sdk/platform-tools/adb reverse tcp:8081 tcp:8081
Could not run adb reverse: spawnSync ~/Library/Android/sdk/platform-tools/adb ENOENT
Building and installing the app on the device (cd android && ./gradlew installDebug...

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring project ':app'.
> The SDK directory '~/Library/Android/sdk' does not exist.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 3.785 secs
Could not install the app on the device, read the error above for details.
Make sure you have an Android emulator running or a device connected and have
set up your Android development environment:
https://facebook.github.io/react-native/docs/android-setup.html

NOTE: In the log it saids SDK directory does not exist, I have double check that I do have the SDK installed in that directory.

I found my android emulator when executing adb devices

List of devices attached
192.168.56.101:5555 device

I have tried the following steps from Stack Overflow post, but still no luck
https://stackoverflow.com/a/38536290/4540216

How to solve:

I got the same issue. I updated my ANDROID_HOME env variable again it worked for me.

Follow this React-native android-setup documentation

ex:

export ANDROID_HOME=~/Library/Android/sdk

Windows:

set ANDROID_HOME=c:/Users/whoever/AppData/Local/Android/Sdk

Mac:

1 – Open your bash profile:

open .bash_profile

Add this to your bash_profile:

 export ANDROID_SDK=/Users/<your_computer_name>/Library/Android/sdk
 export PATH=/Users/<your_computer_name>/Library/Android/sdk/platform-tools:$PATH

Save and close

Compile your changes

source ~/.bash_profile

Edit: Updated document link

###

I also got the same issue. And I updated my ANDROID_HOME env variable again in same cmd and it was worked fine.

> export ANDROID_HOME=~/Android/Sdk 
> export PATH=$PATH:$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools

good luck

###

First I have setup the path in .bash_profile like this

export PATH="~/Library/Android/sdk/platform-tools":$PATH
export ANDROID_HOME="~/Library/Android/sdk/platform-tools"

But it does not resolve my problem.

For me by adding following npm script in package.json under script tag worked like charm on Mac.

"android-dev": "adb reverse tcp:8081 tcp:8081 && react-native run-android"

Then I am simply running npm run android-dev and it’s all set. Make sure that in your app setting Live reload is enabled already, in this way I can worked on development server on my mobile and see the coding changes immediately in app.

###

I solved this error with installing adb

On Linux

sudo apt-get install android-tools-adb

###

Starting with macOS Catalina, your Mac uses zsh as the default login shell and interactive shell. You can make zsh the default in earlier versions of macOS as well.
More details on zsh from Apple

So on your Mac:

1 – Open your .zshrc file:

open ~/.zshrc

2 – if .zshrc file doesn’t exist, you need to create one & open again(Step 1)

touch ~/.zshrc

3 – Add this to your .zshrc file

export ANDROID_SDK=/Users/<your_computer_name>/Library/Android/sdk
export PATH=/Users/<your_computer_name>/Library/Android/sdk/platform-tools:$PATH

4 – Save and close

5 – Compile your changes

source ~/.zshrc

& make sure to restart your terminal.

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