Everytime I try to launch a react native project I got this error
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
I reinstalled nodejs, python and jdk using choco as suggested on official docs. Every single packages is installed as well as sdk 23.0.1
I can see my virtual device if I run adb devices USB debugging is activated and it's running android 6.
I setup ANDROID_HOME path in environment variables, I'm using same sdk path as you can see in the picture. I also setup another one for JAVA_HOME and Python.
My PATH looks like this:
I just don't understand what I'm supposed to do. I'm using a surface pro 4, Windows 10. I can run projects using expo. I literally tried everything, restart computer, start cmd using admin, create new virtual devices, uninstall everything and start from scratch, it just don't work.
You have pointed out two issues; first, make sure you have an android emulator running. To do that, you run adb devices and you say you can see you device.
The other issue is with the environment. To make sure your environment is setup properly for android, go to the root of your react-native project. Open the android project using android studio.
All errors with your environment will show up, use the automatic fixes provided by android studio. Clean the project in android studio. Close studio and go back to command line, run react-native run-android
Everything should work now.
When doing react-native start it will intentionally hang at "Loading dependency graph" (its not really hanging, its just waiting to receive build/bundle signals). This is correct. You have to open a second terminal then do react-native run-android.
If you get errors, then cd android in your project folder then run ./gradlew clean, then after that do another react-native start then react-native run-android.
Solution is to delete all java JDK and reinstall v8 / change JAVA_HOME to the new path.
Also changing gradle-wrapper.propertiesfile for each project you want to run
# update gradle to latest version
distributionUrl=https\://services.gradle.org/distributions/gradle-4.4.1-all.zip
Sometimes it dosen't compile with v4 so I have to use v3. React native is definitely confusing.
after install dan update environment JDK now I can install app on my device
Related
After running npx expo run:android once, the app was pushed to the device and the app started up.
I then uninstalled the app on the device and then when I run npx expo run:android once again I get the error:
CommandError: No development build (<package-name>) for this project is installed. Please make and install a development build on the device first.
Learn more: https://docs.expo.dev/development/build/
I started another dummy project with another package name and the same thing can be reproduced after uninstalling once.
The built app is not installing once again on the Android device and then starting up.
The docs referenced in the error states https://docs.expo.dev/development/build/#locally-with-xcode-and-android-studio the following:
If you are comfortable setting up Xcode, Android Studio, and related dependencies, you can build and distribute your app the same as any other iOS or Android app.
The npx expo run commands will create a new build, install it on to your emulator or device, and start running it.
Not sure what I am doing wrong. Any help is appreciated.
I was trying execute myapp to android but an error occurred.
To clarify what happened, first time I install nodejs and Android Studio.
Later I used the following commands:
npx react-native init 'app'
cd app
npx react-native run-android
Its my fisrt time messing with react native, I was following this page:
https://learn.microsoft.com/pt-br/windows/dev-environment/javascript/react-native-for-android
And the error is:
The error
I want coding in real time for android app.
How can I fix this?
Looks like the terminal output gives you several steps to do/check.
Make sure you have properly set up your android environment. Use this link to do so. You can use Expo-Cli or React-Native-Cli.
SDK location not found. This could be an off-shoot error of not properly doing step 1. However, to cover all of your bases, ensure you have properly set up your Android Emulator. This doc is a great walkthrough.
Once your Android studio and AVD Manager is properly set up, and your development environment is properly set, you should have no issues!
Please let me know if doing the above to steps did or did not solve your errors.
If you follow the steps, https://reactnative.dev/docs/environment-setup and https://developer.android.com/studio/run/emulator there will be no problem.
As a React Native fan on Windows 10, I'd like to mention just few points you need to check.
First, please check following user variables in Environment Variables ( You can see it from System Properties).
adb="C:\Users{username}\AppData\Local\Android\Sdk\platform-tools"
ANDROID_HOME="C:\Users{username}\AppData\Local\Android\Sdk"
JAVA_HOME="C:\Program Files\OpenJDK\openjdk-11.0.15_10"
Path: check if contains {ANDROID_HOME}\platform-tools
Eg:"C:\Users{username}\AppData\Local\Android\Sdk\platform-tools"
Second, if you are using Android Sdk emulator, please make sure that it configured correctly in emulator list in Android Studio.
For an instance, I created a android emulator using android sdk-29 and you can check the followings.
Third, I recommend you, deploy first app on emulator in Android Studio.
Because we need to download gradle zip file and others, it's essential to run your first android app in Android Studio.
When you confirmed your first android app(Deploy empty project app is also okay), you can run your React Native App by Expo-cli or react-native-cli.
I use react-native with actual version and have tried to create a simple project. But while trying to create it by using
expo init AwesomeProject
the whole process hangs.
I have tried to look for a solution by searching on the internet but without any luck.
The error could be seen in the following screenshot:
That error generally means that a file is being accessed by two different things at 'around' the same time. And 90% of those times it is because of an anti-virus or similar.
Its a permission error, so my advice, try to do it after a fresh reboot and boot the powershell as admin, disable antivirus etc..
If still does not work reinstall nodejs/npm.
I had the same experience. The project gets created using React-native. When you try to run it, the 'Metro' interface comes up. There is an android phone on the USB drive which has previously been used to run Android Studio created projects successfully. However, on the command shell the app hangs in Metro.
While trying to run the project from Android Studio snow cat, there are build errors (red) in the App manifest file and there is this exception.
Build failed due to java.lang.NullPointerException
Installed expo-cli (C:\Reactive-native>npm install -g expo-cli). The app fails to run and hangs on the connected Android phone(Samsung 21) using the Expo Go client. This client has no problem having been tested in Snackbar.
I have a question in the Expo forum and probably someone will answer!
Is it possible to build app in React Native using Windows instead of linux ?
I am a really beginner. On the official website ReatNative we can read:
Assuming that you have Node installed, you can use npm to install the
create-react-native-app command line utility:
npm install -g create-react-native-app Then run the following commands
to create a new React Native project called "AwesomeProject":
create-react-native-app AwesomeProject
cd AwesomeProject npm start
But how to do that on windows ?
There is no information about that
Take a look at this page - Getting Started
Please note that you have to select Building Projects with Native Code Tab. Then you can select Windows and Android
On Windows you can only develop react native app for Android. Then if you want to build apps for iOS you need a IDE called Xcode. And Xcode is only available on mac OS. Other way to build apps for iOS is creating a mac OS virtual machine that runs on Windows. your pc / laptop must have enough computing power to run it. I think 8GB RAM, and SSD and a Intel i5 7x series would be enough.
For installing Node.js and other tools you need for your development on Windows you have to use the command prompt. That is what you was asking for. I hope it helps you. Let me know if you have success.
Take a look here
How to use the Windows command line
Getting Started with React Native Development on Windows
I just moved to Ubuntu from Windows 10, I have installed react-native on my laptop and everytime I do react-native init it creates a project as expected. react-native run-android & react-native start commands are working as you'd expect them to be.
My main problem is I just copied a react native project from my Windows 10 machine to Ubuntu and now everytime I do react-native run-android This is the error I see on my console
This is the error I see on my console
Starting JS server...
Running /home/adeel/Android/Sdk//platform-tools/adb reverse tcp:8081 tcp:8081
Building and installing the app on the device (cd android && ./gradlew installDebug...
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
The problem was the React Native project was created in Windows and I was trying to run it in a Linux based platform. So what I did was I created a brand new project in my Linux environment and copied my RN code in the newly created project.
This was I believe due to the android file it created which is platform dependent. Windows and Linux have different GRADLE files. I hope this helps anyone who is having this issue.
Seems like it is not recognizing your device/emulator. Run "adb devices" to check. I guess you did the whole Android setup and installed Android Studio (SDK).