Is there any way to open react native app and simulator using one command..
i mean some thing like : react-native run-android --emulator 'PIXEL_API_27'
i also try :
"scripts": {
"start": "node node_modules/react-native/local-cli/cli.js start",
"android": "react-native run-android --emulator 'PIXEL_API_27'",
"test": "jest"
},
and run command npm run android but its complaining that error: unknown option--simulator'`
i am very new with react native. pls help me ....
There is currently no way to open a terminal by passing additional flags to react-native run-android.
So your problem is two fold. First how to run the emulator from the command line, and second how to chain that command with running your react-native project. Let's deal with them in that order.
Opening the emulator from the command line
It is possible to open an emulator via the command line. that is done with the emulator #avd command, replacing #avd with the name of your android virtual device. For example:
emulator #Nexus_5X_API_27_x86
To get the names of the installed android virtual devices on your machine run emulator -list-avds.
Now that your emulator is running let's get react-native running too.
Running the emulator and then running react-native run-android
I have found one issue with running the emulator from the command line, the emulator command keeps executing meaning that you cannot chain commands using &&. However you can run the emulator terminal in the background, by using & so we can chain the commands in the following way:
emulator #Nexus_5X_API_27_x86 & react-native run-android
If you are happy running the terminal in the background, this could be the solution for you.
For more settings for running the emulator from the command line see the docs
Be warned you may get errors when you try to run the emulator command. The most common that I have come across is the PANIC: Missing emulator engine program for 'x86' CPUS. This may require you to dive into your .bashrc or your .bash_profile to get the emulator command to behave. You can see more here
Related
im trying to run the app in my real device using android studio, eveything is ready and correct, but when i run react-native run-android it will first says connect to the server but then this error appears:
want to use the device as debugger
For running expo apps, you would normally do this using the command line.
Navigate to the root of your project, then (if you still have all the defaults set) you should be able to open a terminal in that directory and type npm run start. This will start the metro bundler and the other react native tools.
The first time doing this might take a while, but when it's done, you should see a QR code. Scan it with your device, you should be prompted to download the expo app and then your application will run on your phone. You only need to download the expo app once, and all the apps you develop using expo will run on it.
I'm not totally sure if this answers your question, but I hope this helped.
*note that this assumes that you have and use npm, the process is slightly different for yarn and other package managers. If npm run start doesn't work for you, make sure you have npm in the PATH variable, and check the package.json file. You should see an entry in scripts - "start": "expo start". You need to type npm run then whatever your key is for the script that has a value of "expo start"
while running npx react-native run-android it shows an error
This issue is happening because you are connected with any Android device or any emulator, to connect with your emulator, you need to add a virtual device, to add a virtual device please follow these links https://developer.android.com/studio/run/managing-avds and https://developers.foxitsoftware.com/kb/article/create-an-emulator-for-testing-in-android-studio/
then run adb devices in your root-project in terminal, you must be able to run the app..
React-native run iOS, error unrecognised command run iOS
Info Run "react-native --help" to see a list of all available commands.
These error occur many time
I haven't answer
Please use the right command
react-native run-ios
Instead
React-native run iOS
How to run react native app in iOS Stimulator?
I'm using npm run ios but I'm getting this error missing srcipt: ios
How to solve this?
You can run your project with just simple
react-native run-ios
And if you want to run on any particular simulator device run this
react-native run-ios --simulator="iPhone 6s" // Check your available devices
Usually we have package.json with any command line scripts, for example:
"scripts": {
"test": "node ./node_modules/jest/bin/jest.js --watchAll",
"dev": "exp start --dev --lan",
"build-android": "exp build:android",
"build-ios": "exp build:ios"
},
In your case, I am not sure from which source you initialized or cloned your project. But you will need to add and you can add without any issue the missing scripts.
You can label them by anything, e.g. "test" can be named by "mytest".
The example I have given above, you can see command exp, this is a module that you will need to install globally in order to run this command.
using npm install -g exp command. Then you can run the custom added scripts.
Find anything confusing, ask again.
Did you try running react-native run-ios?
https://facebook.github.io/react-native/docs/running-on-simulator-ios.html
If that doesn't work, you can always open project-directory/app/ios/[your-project-name].xcodeproj in xcode, and run the simulator in xcode directly.
I am getting this error when I try to run react-native application on my device.
Steps I did:
react-native init SampleApp
cd SampleApp
react-native run-android
react-native start
PS: On first attempt I did successfully run react-native app. Now I am getting this error. I searched a lot but couldn't find solution yet.
Normally, running react-native run-android will open up another command prompt to start the React Packager.
If the packager is somehow not started properly, you can try the following steps:
Run react-native start first to start the packager server manually.
Run react-native run-android which it will detect the packager is running and proceed with deploying the application into the device/emulator.
First, you mus open the react-native local packet server:
react-native start or npm start.
If there is still a problem, may be:
The IP address might be wrong.
Phone cannot access the IP address
Shake your devices show Menu(or click your devices Menu), click the last item dev config setup your computer ip, like 192.168.*.*:8081
The reason is that another application takes port 8081, which is needed for running Metro Bundler. After doing some research, I found out someone does "react-native start" to start the bundler before running "react-native run-ios/android". Running "react-native run-ios" is successful when I previously started the Bundler. After running "react-native run-android", the app can be viewed. However, after could click R to reload the app, it shows 404.
Make sure your port 8081 is not taken by another app. If so, every time when we type "react-native run-ios/android", the Bundler can be automatically started.
When the app is loaded, the window of Bundler should have a progress bar showing the detail of loading the bundle file under ios/android.
BUNDLE [android, dev] ./index.js ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓ 100.0% (481/481), done.