【发布时间】：2020-05-20 10:54:00
【问题描述】：
当我做 react-native run-android 我得到这个错误：
info Running jetifier to migrate libraries to AndroidX. You can disable it using "--no-jetifier" flag.
Jetifier found 960 file(s) to forward-jetify. Using 6 workers...
info Starting JS server...
/bin/sh: 1: adb: 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...
Deprecated Gradle features were used in this build, making it incompatible with Gradle 7.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/6.0.1/userguide/command_line_interface.html#sec:command_line_warnings
FAILURE: Build failed with an exception.
* What went wrong:
Task 'installDebug' not found in project ':app'.
* Try:
Run gradlew tasks to get a list of available tasks. 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 4s
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
FAILURE: Build failed with an exception.
* What went wrong:
Task 'installDebug' not found in project ':app'.
* Try:
Run gradlew tasks to get a list of available tasks. 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
我不明白，在我运行我的 React Native 应用程序之前，我先打开 Android 模拟器。我还注意到我的 android studio 在欢迎页面上没有“配置”，所以如果我想访问 sdk 管理器和 avd 管理器，我必须启动一个项目。
【问题讨论】：
-
我遇到了同样的问题，使用 React native .62 尝试运行以下
react-native run-android --variant PreDebug -
我得到同样的错误
-
我认为您需要检查您的项目 Gradle，从 android studio 打开您的项目平台，然后尝试同步并更新 Gradle 并重建项目
-
尝试运行
npx react-native run-android命令 -
我仍然遇到同样的错误
标签： android react-native