Run react-native on android emulator

Question

I try to run react-native app on genymotion android emulator on my mac. When I write react-native run-android It gets

Running /usr/local/opt/android-sdk/platform-tools/adb reverse tcp:8081 tcp:8081
error: closed
Could not run adb reverse: Command failed: /usr/local/opt/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
MacBook-Pro-MacBook:ART-CarefulPeople macbook$ 

Then I've tried:

1. react-native start
2. react-native run-android

The same result.

Then I've tried:

1. react-native bundle --entry-file index.android.js --platform android --bundle-output android/app/src/main/assets/index.android.bundle

2. curl "http://localhost:8081/index.android.bundle?platform=android" -o "android/app/src/main/assets/index.android.bundle"

3. react-native run-android

The same result.

I've tried just adb reverse tcp:8081 tcp:8081 and it says error: closed

When I try to run app on android-sdk emulator it gets the same error above but without error: closed.

From android studio I can run this app and it works on genymotion. Tell me please what should I do to run my app on android emulator?

Answer 1

I had a similar problem, and after spending so much time and lots of searching about this issue the only trick worked for me:

1. Please Install the Required SDKs as shown in this figure

Configure Required SDKs

2. If You have already installed it, so you must have to update the following SDKs:
   • Android SDK Tool (update it to latest version)
   • Android SDK Platform-tools (update it to latest version)
   • Android SDK Build-tools (update it to latest version)
   • Android Support Repository under Extra folder (update it to latest version)
3. You Must have at least Installed the Same version Android API as the installed Android SDK Build-tools & Android SDK Platform-tools version as shown in the Configure Required SDKs figure above.

Note: Local Maven repository for Support Libraries which is listed as the SDK requirement in the official docs of React-native is now named as Android Support Repository in the SDK Manager .