React native: Android project not found. Maybe run react-native android first? - react-native

Question

I had an issue in my React-Native project which was working fine earlier but suddenly it stopped working. Whenever I used the command:
react-native run-android
I was getting an error:
Android project not found. Maybe run react-native android first?
I tried running:
react-native android
But it said:
Unrecognized command 'android' Run react-native --help to see list of
all available commands
After trying:
D:\ProjectRoot\ReactNativeProjects\AwesomeProject>react-native eject
The error returned was:
Scanning folders for symlinks in
D:\ProjectRoot\ReactNativeProjects\AwesomeProject\node_modules (48ms)
App name must be defined in the app.json config file to define the
project name. It must not contain any spaces or dashes.
This is the app.json file:
{
"expo": {
"name": "AwesomeProject",
"description": "A very interesting project.",
"slug": "AwesomeProject",
"privacy": "public",
"sdkVersion": "30.0.0",
"platforms": ["ios", "android"],
"ios": {
"supportsTablet": true
},
"android": {
"package": "com.project.first"
},
"version": "1.0.0",
"orientation": "portrait",
"icon": "./assets/images/icon.png",
"splash": {
"image": "./assets/images/splash.png",
"resizeMode": "contain",
"backgroundColor": "#ffffff"
},
"updates": {
"fallbackToCacheTimeout": 0
},
"assetBundlePatterns": [
"**/*"
]
}
}

Answer 1

I raised this question and answered myself as I thought it will help others who are facing similar issue. I struggled a lot to find out the real reason behind it as the error shown in terminal was not precise.
To resolve the issue please upgrade the react-native package.
Go to the Project root.
Upgrade the React native package in the Command Prompt by typing :
react-native upgrade.
Then Accept to update all the Files by typing y (Yes) in the Command Prompt.
Reference: https://github.com/facebook/react-native/issues/9312

Answer 2

Open your React Native Project Root Directory and locate android -> app -> build -> intermediates -> signing_config -> debug -> out -> signing-config.json .
delete signing-config.json this file
try again
Or
1)Sometimes if we have older version of react native and some of newly installed packages dose not support older version. Then you have to update the react native project using react-native upgrade command.
After done updating current project to new version this error should resolved.

Answer 3

I know it is an old question but any of those solutions did not work for me and maybe there are others like me. I solved my problem running this command before run-android
react-native eject

Answer 4

Make sure to start the project using command (non-expo):
react-native init <your-project-name>
If existing folder, then follow:
react-native eject
In the latest version of react-native this suggestion comes when you try to issue the command:
react-native eject
Scanning folders for symlinks in
D:\ProjectRoot\ReactNativeProjects\AwesomeProject\node_modules (48ms)
App name must be defined in the app.json config file to define the
project name. It must not contain any spaces or dashes.
Now when you issue the following command:
D:\ProjectRoot\ReactNativeProjects\AwesomeProject>react-native upgrade
The following shows up:
Scanning folders for symlinks in
D:\ProjectRoot\ReactNativeProjects\AwesomeProject\node_modules (56ms)
You should consider using the new upgrade tool based on Git. It makes
upgrades easier by resolving most conflicts automatically. To use it:
- Go back to the old version of React Native
- Run "npm install -g react-native-git-upgrade"
- Run "react-native-git-upgrade" See https://facebook.github.io/react-native/docs/upgrading.html
react-native version in "package.json" doesn't match the installed
version in "node_modules". Try running "npm install" to fix this.
Aborting.
In the Facebook react-native commands suggestions, there is a clear solution.
These commands check the current version and whether there is update needed or not.
One more solution:
react-native: Command run-android unrecognized. Maybe caused by npm install
Please also see:
Solution to "Expo : cannot find a module LogReporter"

Answer 5

Open Command Prompt as Administrator and goto the project folder, run android(npx react-native run-android)

Answer 6

I did like this... Worked !!
In the CMD Project root run react-native upgrade.
if you are still getting issues, make sure you have react-native
in dependencies json in package.json, add it if not
if you are still getting issues, get the version of react native in cmd using react-native -v and check if the value returned in cmd and package.json are same. update the package.json with the value returned in cmd
Here my problem solved.

Answer 7

I had to restyle my AndroidManifest.xml because I had a syntax error somewhere (I had an extra "/" somewhere). Now it's fixed. Be very careful with your syntax...

Answer 8

Remove the file: React Native Project Root Directory and locate android -> app -> build -> intermediates -> signing_config -> debug -> out -> signing-config.json .

Answer 9

Running Terminal as Administrator in Windows did the trick for me... Other solutions did not work.

Answer 10

Open your React Native Project Root Directory and locate android -> app -> build -> intermediates -> signing_config -> debug -> out -> signing-config.json
Delete the file and try again.

Answer 11

I faced this problem today, and none of the solutions worked for me, so I found another one.
Badly Formatted AndroidManifest.xml will cause this problem, perhaps you set the splash screen like me today, and didn't formatted AndroidManifest in the correct way

Answer 12

We had this issue because files from android folder gradlew and gradlew.bat (Gradle startup script for the UN*X, Windows respectively) somehow got into the global .gitignore file, and so were not presented on local environments.
Actually running react-native upgrade command restore those files, thus fixing the problem.

Answer 13

As a complement, in the case react-native command is not found, you should install react-native CLI:
npm install -g react-native-cli
Then you can follow the steps people said above.
More details: react-native: command not found

Answer 14

Delete signing-config.json next try again react-native run-android
signing-config.json file Path : android -> app -> build -> intermediates -> signing_config -> debug -> out -> signing-config.json

Answer 15

If you started your project by following
npm install -g create-react-native-app
create-react-native-app MyReactNative
npm install -g react-native-cli
npm start
after this, you can face problem mention above in question So the solution is :
npm run eject

Answer 16

I'm using Android Studio (non-expo) and this works for me
react-native init <your-project-name>

Answer 17

I think one more simple thing you could have checked, is if previously you ran the project as different role of a user, like in windows if you ran previously the react-native run-android with an administrator role.

Answer 18

This error simply means you don't have 'android' and 'ios' folders in your root directory of the project. Their location is important.
SOLUTION:-
Open your project folder search for 'android' and iso 'folder', move these folders in your root folder of the project and then start the project with react-native run-android

Answer 19

For me, "rm -rf android/app/build/" worked
Run your command with "--verbose". I got the error that it couldn't read a file (in android/app/build/generated/not_namespaced_r_class_sources/). I deleted this folder, and it worked

Answer 20

My working solution is below, none of the above worked for me:
CD into your project folder and type expo start --android.
Or the long way:
Open AVD manager in Android Studio and run a virtual device (you can
close AS afterwards)
CMD into your project folder and type 'expo start'
Once Expo has started choose option 2 which is "Press a for Android
emulator"
It will install expo on the virtual device and you can test from there

Answer 21

Here, app.json does not have name, but it has expo related config.
So just add name and display name fields in app.json.
app.json (first two lines) :
{
"name": "AwesomeProject",
"displayName": "Awesome Project",
"expo": {
"name": "AwesomeProject",
"description": "A very interesting project.",
"slug": "AwesomeProject",
"privacy": "public",
"sdkVersion": "30.0.0",
"platforms": ["ios", "android"],
"ios": {
"supportsTablet": true
},
"android": {
"package": "com.project.first"
},
"version": "1.0.0",
"orientation": "portrait",
"icon": "./assets/images/icon.png",
"splash": {
"image": "./assets/images/splash.png",
"resizeMode": "contain",
"backgroundColor": "#ffffff"
},
"updates": {
"fallbackToCacheTimeout": 0
},
"assetBundlePatterns": [
"**/*"
]
}
}
After this, just run :
$ react-native eject
info Generating the iOS folder.
info Generating the Android folder.
No need to do react-native upgrade.

Answer 22

You have to run your cmd with admin priviliges. That solved the same issue for me.
Didnt do "eject" or anything else.

Answer 23

In my case, I've forgotten to add Sudo. Fixed as follows,
sudo npx react-native run-android

Answer 24

Delete react native android build folder and then retry command npx react-native run-android

Answer 25

In my case i didn't had the right permissions for my project folder.
If this is your case just click with the right button on the folder > Properties > Security > Advanced and then change the ownership of the folder to your user, including the subfolders. That should do it

Answer 26

So if there is anyone having this issue here what worked for me,
{
"name": "ZedMusic",
"displayName": "zedmusic",
"expo": {}
}
the project name must be outside expo, then run npx react-native eject

Answer 27

When I ran react-native eject, I got this error:
Both the iOS and Android folders already exist! Please delete `ios` and/or `android` before ejecting.
Delete the MyProject/android folder.
Run react-native eject This generated the android folder
Then run react-native run-android to build android

Answer 28

You should consider using the new upgrade tool based on Git. It makes upgrades easier by resolving most conflicts automatically.
To use it:
- Go back to the old version of React Native
- Run "npm install -g react-native-git-upgrade"
- Run "react-native-git-upgrade"
See https://facebook.github.io/react-native/docs/upgrading.html

Answer 29

If you have created your project with the expo command, like expo init projectname, then afterwards you have to eject your project:
expo eject
If you have created you project by react-native init projectName then you have to use
react-native eject

Answer 30

May be it's too late, I replaced the Android folder from a backup file. It worked for me.