【发布时间】:2017-08-28 15:47:40
【问题描述】:
您好,我正在尝试在我的 react-native 项目上运行“yarn android”。我遇到了以下错误:
yarn android v0.27.5
$ react-native-scripts android
10:37:45 AM: Starting packager...
10:39:34 AM: Starting Android...
10:39:37 AM: Packager started!
To view your app with live reloading, point the Expo app to this QR code.
You'll find the QR scanner on the Projects tab of the app.
<QR CODE>
Or enter this address in the Expo app's search bar:
exp://172.19.29.31:19000
Your phone will need to be on the same local network as this computer.
For links to install the Expo app, please visit https://expo.io.
Logs from serving your app will appear here. Press Ctrl+C at any time to stop.
Error running adb: Error running app. Error: Activity not started, unable to resolve Intent { act=android.intent.action.VIEW dat=exp://172.19.29.31:19000 flg=0x10000000 }
(node:28009) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): TypeError: Cannot read property 'length' of null
我使用 create-react-native-app 生成器来设置我的应用程序,这是我的项目结构:
<username>$ls
App.js app.json gen package.json
App.test.js assets my-app-key.keystore stylesheet.js
README.md components node_modules yarn.lock
我还尝试使用我的 expo 应用程序扫描 qr 码以在我的手机上运行我的应用程序,但它达到 100%,然后从应用程序中崩溃,或者它给出了深蓝色屏幕,其中错误是“未捕获的错误” “打包程序未在 http::19003 运行”(即使我扫描的端口是 http:19000)。
我刚刚也尝试运行“npm start”,然后为 android 选项运行“a”,但收到以下消息: 上午 11:40:20:启动 Android...
Error running adb: Error running app. Error: Activity not started, unable to resolve Intent { act=android.intent.action.VIEW dat=exp://172.19.29.31:19000 flg=0x10000000 }
› Press a to open Android device or emulator, or i to open iOS emulator.
› Press q to display QR code.
› Press r to restart packager, or R to restart packager and clear cache.
› Press d to toggle development mode. (current mode: development)
(node:31496) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): TypeError: Cannot read property 'length' of null
11:43:30 AM: Running app on SM-T560NU in development mode
11:44:01 AM: [sane] Warning: Lost connection to watchman, reconnecting..
谁能帮我解决这个问题?
【问题讨论】:
-
你能理解这个错误是什么意思“Cannot read property 'length' of null”吗?对我来说似乎是一个 JS 代码。不确定。
标签: android react-native expo create-react-native-app