任务'：app：installDebug'的React Native BUILD FAILED执行失败

Question

运行cmd> react-native run-android时出现以下错误指导我修复此问题。

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:installDebug'.
> com.android.builder.testing.api.DeviceException: No connected devices!

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 1 mins 27.72 secs
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

Answer 1

似乎没有连接的设备，或者无法检测到该设备。执行adb devices以查看已连接设备的列表。如果没有设备出现，请确保模拟器已打开，或者设备已连接并且启用了USB调试模式。

如果仍不能解决问题，请通过运行adb kill-server然后重新启动adb服务器adb start-server（sudo如果使用linux或mac ，则可能需要与之一起运行）

但是，如果adb devices显示未经授权，则只需解锁手机并授予计算机访问权限。