API call in Android 9 configuration devices and emulator shows connection error

问题

I am using Android 9 emulator, it has internet connection from system and I have added internet permission in manifest. When I try to call api it shows error message as : connection error.

回答1:

As piyush commented in my question the answer is to add android:usesCleartextTraffic="true" in manifest file with in application tag

    <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="com.mypackage">

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

    <application
        android:allowBackup="true"
        android:icon="@drawable/appicon"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme"
        android:usesCleartextTraffic="true">
 <activity />
</application>

回答2:

Just add below in manifest's application tag

android:networkSecurityConfig="@xml/network_security_config"

Add below code inside the application where we add activities

 <uses-library android:name="org.apache.http.legacy" android:required="false"/>

Add xml folder in res folder. and create a network_security_config.xml file in xml folder.

    <?xml version="1.0" encoding="utf-8"?>
    <network-security-config>
        <domain-config cleartextTrafficPermitted="true">
            <domain includeSubdomains="true">your domain which is your base url for webservice.com</domain>
        </domain-config>
    </network-security-config>

来源：https://stackoverflow.com/questions/53368470/api-call-in-android-9-configuration-devices-and-emulator-shows-connection-error