React native run-android do not updating modified

问题:

I am using React native 0.52.0 and react-native-cli 2.0.1 on my Windows PC for android development. Despite all the changes i have made. When I run react-native run-android, it builds successfully but when I run it, I get the default react native screen.

The result when I run react-native run-android-

The app I get-

index.js

import { AppRegistry } from 'react-native';
import App from './App';

AppRegistry.registerComponent('albums', () => App);

app.js

import React from 'react'
import ReactNative, { Text } from 'react-native'

export default const App = () => {
  return (
    <Text>Hello World</Text>
  )
}

When i ran react-native init albums, it was just an index.js file that was created, there was no index.android.js or index.ios.js file What am I doing wrong?

回答1:

Assuming that you are in the right folder, try to do this:

react-native bundle --platform android --dev false --entry-file index.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res/

if you have index.android.js, do this instead:

react-native bundle --platform android --dev false --entry-file index.android.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res/

Then just execute react-native run-android.

回答2:

SOLUTION

react-native bundle --platform android --dev false --entry-file index.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res

OUTPUT will be :

`c:\Users\lenger\Desktop\webrowser>react-native bundle --platform android --dev false --entry-file index.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res
Scanning folders for symlinks in c:\Users\lenger\Desktop\webrowser\node_modules (43ms)
Scanning folders for symlinks in c:\Users\lenger\Desktop\webrowser\node_modules (38ms)
Loading dependency graph, done.
bundle: start
bundle: finish
bundle: Writing bundle output to: android/app/src/main/assets/index.android.bundle
bundle: Done writing bundle output

and after

Run react-native run-android again, you will find your modification work.

https://lengerrong.blogspot.am/2018/01/react-native-run-android-do-not.html

回答3:

You are probably updating the wrong file and not calling it in the AppRegistry class.

Check (or post) your full index.android.js and make sure that the file that it is invoking and importing is the one you are actually modifying.

回答4:

This worked for me. Step 1)

rm -rf /usr/local/var/run/watchman && brew uninstall watchman && brew install watchman

Step2)

react-native start

回答5:

This worked for me:

In your project folder run this

c:\Users\lenger\Desktop\YourProjectFolder>react-native bundle --platform android --dev false --entry-file index.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res

Scanning folders for symlinks in c:

\Users\lenger\Desktop\webrowser\node_modules (43ms)
Scanning folders for symlinks in c:\Users\lenger\Desktop\webrowser\node_modules (38ms)
Loading dependency graph, done.
bundle: start
bundle: finish
bundle: Writing bundle output to: android/app/src/main/assets/index.android.bundle
bundle: Done writing bundle output

Run react-native run-android again

I share the link where i found this solution: https://lengerrong.blogspot.com/2018/01/react-native-run-android-do-not.html

回答6:

For me the problem was that I had removed internet permissions from my AndroidManifest.xml (since it technically wasn't needed). React Native uses that permission to connect your app to the development machine (and enable live-debugging).

<uses-permission android:name="android.permission.INTERNET" />

回答7:

in your terminal window go to your project folder and than try this command

react-native bundle --platform android --dev false --entry-file index.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res/

回答8:

run the script below after that just do 1.gradlew clean 2.react-native link

react-native bundle --platform android --dev false --entry-file index.js --bundle- 
output android/app/src/main/assets/index.android.bundle --assets-dest 
android/app/src/main/res

回答9:

In my case, deleting below line in gradle.properties solved it.

org.gradle.configureondemand = true

回答10:

Open package.json file and update this code.

"scripts": {
"android": "react-native bundle --platform android --dev false --entry-file index.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res && react-native run-android",
"ios": "react-native run-ios"
},

Assuming that you are in the right folder, try to do this:

Run this command only it will automatically both commands.

npm run android

回答11:

In your project directory, there is package.json file. You can add following code snippet in that json file under scripts:. After that you can run application using one command that is npm run android-windows. To work fine you should add below code script.

"android-windows": "react-native bundle --platform android --dev false --entry-file index.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res && react-native run-android"

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