即使在模拟器运行时，React Native 也无法运行-android

Question

Running the command react-native run-android fails with the following output:

Starting JS server...
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

The curious thing about this problem is that an emulator is running. adb devices returns

List of devices attached 
emulator-5554   device

If these details help, its running in Linux, with the emulator set as Android 6.0 API Level 23, using Google APIs Intel Atom (x86).

Answer 1

I had the same issue just last week. I tried building the project thru Android Studio. I think one of the reasons of this error is that, the build looks for the updated (or compatible) version of the Gradle. What I did was just let Android Studio be the one to update the gradle on the first build.

After that my app runs and builds without any issues.

Hope this helps.

Answer 2

you might check the permissions on android/gradlew

they should be 755 not 644

run

chmod 755 android/gradlew 

inside your app root folder then open your terminal again and run

react-native run-android

and it should work again.