在mac上开发rn项目出错

运行react-native run-ios正常，但run-android时，直接弹出错误：

MacBook-Pro:doa wxd$ react-native run-android

Scanning 579 folders for symlinks in /Users/w9xd/projects/rn/doua/node_modules (40ms)

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

在网上找了相当多的答案，都说是android或者java的sdk位置配置不正确，但配置后一样有毛病，最后终于在github上面看到一位大神的回答，解决了。

@RainliFu
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 run react-native run-android

and it should work again.

这个回答解决几百人的困惑，真的太好了。

网址：https://github.com/facebook/react-native/issues/8868