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

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.

1. Go to the Project root.

2. Upgrade the React native package in the Command Prompt by typing :

   react-native upgrade.

3. 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.

2. 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

I did like this... Worked !!

1. In the CMD Project root run react-native upgrade.
2. if you are still getting issues, make sure you have react-native in dependencies json in package.json, add it if not
3. 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 6

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

Answer 7

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

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

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 10

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 11

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 12

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 13

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 14

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 15

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 16

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 17

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 18

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 19

I'm using Android Studio (non-expo) and this works for me

react-native init <your-project-name>

Answer 20

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

Answer 21

In my case, I've forgotten to add Sudo. Fixed as follows,

sudo npx react-native run-android

Answer 22

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

Answer 23

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 24

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:

1. Open AVD manager in Android Studio and run a virtual device (you can close AS afterwards)
2. CMD into your project folder and type 'expo start'
3. 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 25

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 26

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 27

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 28

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

Answer 29

I solved the issue by killing all instances of java.exe with: taskkill /f /im java.exe.

Answer 30

I had the same error in a project (created with React Native CLI):

turns out I had a syntax error in my android manifest file (android/app/src/main/AndroidManifest.xml).