Error while executing npx react-native run-android

react-native run-android not working windows
react-native run-android error
error unrecognized command "run-android".
npx react-native run-ios
yarn react-native run-android
react native cli
npx react-native start
react native run https

I am new to React native and trying to connect my android device but it is showing the following error. I have probably made some mistakes during installation. What should I do so that the emulator will start?

    C:\Users\Bhavna>cd AwesomeProject

C:\Users\Bhavna\AwesomeProject>npx react-native run-android
info Running jetifier to migrate libraries to AndroidX. You can disable it using "--no-jetifier" flag.
Jetifier found 864 file(s) to forward-jetify. Using 4 workers...
info JS server already running.
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...
> Task :app:installDebug FAILED

Deprecated Gradle features were used in this build, making it incompatible with Gradle 6.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/5.5/userguide/command_line_interface.html#sec:command_line_warnings
27 actionable tasks: 2 executed, 25 up-to-date

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:installDebug'.
> com.android.builder.testing.api.DeviceException: No connected devices!

* 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 6s

error Failed to install the app. Make sure you have an Android emulator running or a device connected. Run CLI with --verbose flag for more details.
Error: Command failed: gradlew.bat app:installDebug -PreactNativeDevServerPort=8081

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:installDebug'.
> com.android.builder.testing.api.DeviceException: No connected devices!

* 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 6s

    at checkExecSyncError (child_process.js:621:11)
    at execFileSync (child_process.js:639:15)
    at runOnAllDevices (C:\Users\Bhavna\AwesomeProject\node_modules\@react-native-community\cli-platform-android\build\commands\runAndroid\runOnAllDevices.js:94:39)
    at processTicksAndRejections (internal/process/task_queues.js:93:5)

You should connect a physical device or launch simulator from android studio, before running react-native run-android

> com.android.builder.testing.api.DeviceException: No connected devices!

npx react-native run-android not working � Issue #28480 � facebook , tuandt commented on Apr 3. Make sure you have an Android emulator running or a device connected and have. That� I was working on a react-native APP in the same environment for a long time, but my computer had a problem and I had to change it. I've been trying to run the same APP in the new environment for a few days (I haven't changed anything in the code and I believe I did the setup correctly)

You should check if you enable the debug mode in your phone. And follow this.

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

adb reverse tcp:8081 tcp:8081

adb shell input keyevent 82

The first one enables adb in your terminal. And the second onen enables 8081 port. If you run the third one then you could see the developer menu in your app.

Error running 'react-native run-android' in version 0.61 � Issue , Error running 'react-native run-android' in version 0.61 #26929. Open : ReactNative:Cannot run program "npx": error=2, Arquivo ou diret�rio� No such file or directory, open 'app\build\intermediates\merged_manifests\debug\AndroidManifest.xml' in React-Native Hot Network Questions Grep all lines with exactly one instance of a specific character

I tried changing option from 'charging this device' to 'transfer files' and now it's working fine. Thank you everyone!

Unable to run app on android (npx react-native run-android) � Issue , Error: C:\Users\muks\Documents\Shabdkoshish\dev\FunKhelHN>npx react- native run-android info Running jetifier to migrate libraries to� Try executing these line by line. 1. yarn 2. yarn start. On a new terminal tab 1. react-native run-android. Check whether 'jetifier' running output is displayed on the terminal. Something similar to this. "Running jetifier to migrate libraries to AndroidX. You can disable it using "--no-jetifier" flag."

npx react-native run-android: Task :app:installDebug FAILED � Issue , Description: I am trying to run react native app to my real android device. V/ ddms: execute: running am get-config 07:14:18 V/ddms: execute 'am Get more help at https://help.gradle.org BUILD FAILED in 18s error Failed� so , in the Node.js command prompt , react-native start and react-native run-android both works well ,the problem only occurs on my company's computer. the VS Code version is '0.10.11', extensions are React Native Tools and Reactjs code snippets,etc. the same VS Code in other computer works well ,the same project also works well in that

Running On Device � React Native, Running your app on Android devices use the React Native CLI to generate and run a Release build (e.g. npx react-native run-android --variant=release ). Teams. Q&A for Work. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

Troubleshooting � React Native, These are some common issues you may run into while setting up React npx react-native start --port=8088 If you encounter an error such as npm WARN locking Error: EACCES while using the React Native CLI, try running the following: Execution failed for task ':app:installDebug'. com.android.builder. testing.api. react-native run-android Command 'run-android' unrecognized. Make sure that you have run 'npm install' and that you are inside a react-native project. I have run npm install before, does not work anyways

Comments
  • But i have already connected the device. And how can I launch the simulator from android studio.
  • if you have connected device check if USB debugging si activated in developer options of your device, but before that be sure your development environment is good see facebook.github.io/react-native/docs/getting-started
  • yes i have enabled USB debugging it is still not working. what should i do now?
  • check if ANDROID_HOME environment variable is set, when your device is plugged run adb devices you should see your device listed. I recommande you to follow react-native docs facebook.github.io/react-native/docs/getting-started to set your development environment.
  • I tried everything as mentioned but the thing is my Pc is not detecting my Redmi Note 4 while it is detecting every other device. why is this happening? I even tried downloading necessary drivers. ps: sorry for the late reply.