Day 9 設置完專案編號後，用指令 adb devices 查看目前連到桌機的實體手機裝置列表。

List of devices attached
(省略) device
(省略) device

指令 npx expo run:android --device，在實體手機裝置上開啟 React Android 應用程式。
但出現下列錯誤訊息：

📝 Android package Learn more: https://expo.fyi/android-package

CommandError: Input is required, but 'npx expo' is in non-interactive mode.
Project must have a android.package set in the Expo config (app.json or app.config.js).

AI 提示需要先設定 package 名稱。位置在 expo 的 android 區塊裡面，如下：

檔案 app.json
{
  "expo": {
    "name": "NotificationProgress",
    "slug": "NotificationProgress",
    "version": "1.0.0",
    "orientation": "portrait",
    "icon": "./assets/icon.png",
    "userInterfaceStyle": "light",
    "splash": {
      "image": "./assets/splash.png",
      "resizeMode": "contain",
      "backgroundColor": "#ffffff"
    },
    "ios": {
      "supportsTablet": true
    },
    "android": {
      "adaptiveIcon": {
        "foregroundImage": "./assets/adaptive-icon.png",
        "backgroundColor": "#ffffff"
      },
      "package": "你的 package 名稱"
    },
    "web": {
      "favicon": "./assets/favicon.png"
    },
    "extra": {
      "eas": {
        "projectId": "省略"
      }
    }
  }
}