react-native run-android Building Error ':app:generateDebugBuildConfig'

Question

I am having a problem to build a new project. I am using React-Native and Android Emulator (AVD) but when I use the command react-native run-android I get the f

Answer 1

React Native

Faced similar issue while building react native app. Running on the different port as the default port (8081) is used by some other app.

Command to build the app.

react-native run-android --port=8082

Solution My case

(Removed extra attribute android:screenOrientation="portrait". If you check the log, it says

lineNumber: 26; columnNumber: 56; Attribute "screenOrientation" bound to namespace "http://schemas.android.com/apk/res/android" was already specified for element "activity".

hence removed the same attribute. This was being added multiple times

Error log

Configure project :react-native-webview
:react-native-webview:reactNativeAndroidRoot /Users/PROJECT_PATH/node_modules/react-native/android

Task :app:generateDebugBuildConfig FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:generateDebugBuildConfig'.
org.xml.sax.SAXParseException; systemId: file:/Users/PROJECT_PATH/android/app/src/main/AndroidManifest.xml; lineNumber: 26; columnNumber: 56; Attribute "screenOrientation" bound to namespace "http://schemas.android.com/apk/res/android" was already specified for element "activity".

* 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 1s
32 actionable tasks: 1 executed, 31 up-to-date
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/getting-started.html

Command failed: ./gradlew installDebug

Answer 2

cd android //Navigate into the android folder from the root directory

gradlew clean // Run this

Answer 3

Navigate into the android folder of your react-native project and type the following:

gradlew cleanBuildCache

Then fire up something like Android Studio do a build and you should find the issue is resolved. If you still get errors check the log carefully the information is in there just hard to find.

Answer 4

Create rn.sh file in your root of React native project with following content

 cd android/app/
 rm -rf build
 cd ..
 cd ..
react-native run-android

Then run from terminal or cmd

./rn.sh

Recommendation

VSCode must be run as Admistrator or GitDesktop must be run as Administrator

Answer 5

@diego-barreto

Added the value C:\....\AppData\Local\Android\sdk\tools to the variable Path and I got build sucessful. Problem solved. Yay.