android 9.0 http無法訪問問題

java.lang.Error: java.net.UnknownServiceException: CLEARTEXT communication to 127.0.0.1 not permitted by network security policy

在res/xml下新建network-security-config.xml

<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
    <base-config cleartextTrafficPermitted="true" />
</network-security-config>

修改AndroidManifest.xml文件 在application標簽上添加 android:networkSecurityConfig="@xml/network_security_config"

<application
        android:name=".conf.MyApp"
        android:allowBackup="true"
        android:icon="@mipmap/ic_logo"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_logo_round"
        android:supportsRtl="true"
        android:networkSecurityConfig="@xml/network_security_config"
        android:theme="@style/AppTheme">

然后就可以使用了（本地搗鼓半天自簽名https證書沒成功，先這么用着）