Android9.0处理方法

network-security-config.xml在res里面XML文件夹

<network-security-config>
    <base-config cleartextTrafficPermitted="true">
        <trust-anchors>
            <certificates src="system" />
        </trust-anchors>
    </base-config>
</network-security-config>

AndroidManifest.xml

<application
    ....
    android:networkSecurityConfig="@xml/network_security_config" >

如果还不行就改一下下面的targetSdkVersion

android {
    compileSdkVersion 28
    defaultConfig {
        minSdkVersion 17
        targetSdkVersion 27