react-native run-android issue - error Android project not found

Question

I create a react native app in C9. Now, I want to develop this app on my local machine with android settings. I downloaded the project.

cd myProjectFolder
react-native start
npm install
react-native run-android

Also, I add a project name in package.json.

The error is below:

error Android project not found. Are you sure this is a React Native project?

Answer 1

如果 android 项目/文件夹未在您的根项目中退出，则运行：

react-native eject

Answer 2

I encountered this issue after I ruan ./gradlew clean . Tried serval methods but vain. Then I ran ./gradlew in the Android directory. It worked for me.

// Android
./gradlew