React Native won't recognize the Android SDK

Question

I have a React Native application, that runs fine on iOS, I tried to run it on Android too, but I always get the error:

error Failed to install the app. Make sure you have the Android development environment set up: https://reactnative.dev/docs/environment-setup. Run CLI with --verbose flag for more details.
Error: Command failed: ./gradlew app:installDebug -PreactNativeDevServerPort=8081
D8: Cannot fit requested classes in a single dex file (# methods: 116691 > 65536 ; # fields: 80012 > 65536)

I tried every solution I saw, nothing worked.

I ran the react-native-community cli doctor and it seems like React Native won't recognize the Android SDK. I checked, and the emulator sdk and the gradle sdk versions are the same. echoing ANDROID_HOME on the terminal properly gives me the sdk path, I followed the React Native getting started again to see if I missed something, but it seems like everything is install correctly.

I can't figure out why this won't run.

Have you tested a “hello world” apps a sanity check? The complaint about class size means it appears to be trying to run. — Dave Newton
– Dave Newton, Commented Sep 19, 2020 at 11:40
@DaveNewton Yes, I have the application running great on iOS, on Android I can't run it. I also tried to run native Android application, to check if everything really installed properly, I have no problem running a native app. — John Doah
– John Doah, Commented Sep 19, 2020 at 11:46

kareem adel · Accepted Answer · 2020-09-20 01:23:47Z

1

In your android\app\build.gradle try adding

android {
    ...
    defaultConfig {
        ...
        multiDexEnabled true
   }
}

answered Sep 20, 2020 at 1:23

kareem adel

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