如果您使用模拟器为本地服务器运行您的应用程序.提及本地 ip 为 10.0.2.2 并且必须向您的应用授予 Internet 权限:

if you are using emulator to run your app for local server. mention the local ipas 10.0.2.2 and have to give Internet permission into your app :

<uses-permission  android:name="android.permission.INTERNET" />