无法在 Android 上运行 React-Native答案

【问题标题】：Failed to run React-Native on Android无法在 Android 上运行 React-Native
【发布时间】：2020-10-01 02:20:17
【问题描述】：

在此处遵循 React Native 的官方指南后，我收到此错误： https://reactnative.dev/docs/environment-setup 我试图打开模拟器并再次运行命令，但我得到了同样的错误。

info Running jetifier to migrate libraries to AndroidX. You can disable it using "--no-jetifier" flag.
Jetifier found 967 file(s) to forward-jetify. Using 4 workers...
info Starting JS server...
/bin/sh: adb: command not found
info Launching emulator...
error Failed to launch emulator. Reason: No emulators found as an output of `emulator -list-avds`.
warn Please launch an emulator manually or connect a device. Otherwise app may fail to launch.
info Installing the app...

FAILURE: Build failed with an exception.

* What went wrong:
Could not initialize class org.codehaus.groovy.runtime.InvokerHelper

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

* Get more help at https://help.gradle.org

BUILD FAILED in 1s

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```

【问题讨论】：

您没有安装任何模拟器。您可以在 Android Studio 中安装模拟器或将您的安卓手机连接到您的机器进行测试。
如果模拟器或安卓设备已经连接，请检查您的adb路径是否配置正确。

标签： android react-native android-studio

【解决方案1】：

你应该连接一个安卓设备（激活开发者模式）或者打开一个模拟器 Android工作室的AVD经理

【讨论】：

【解决方案2】：

请在项目文件夹中的终端运行以下命令

export ANDROID_HOME=/Users/{yourusername}/Library/Android/sdk
export PATH=$ANDROID_HOME/platform-tools:$PATH
export PATH=$ANDROID_HOME/tools:$PATH

然后npm run android

【讨论】：