I have already defined a custom network security config and included it in my manifest as recommended here
res/xml/network_security_config.xml:
127.0.0.1
localhost
and this is in my Android.manifest:
android:allowBackup="false"
android:usesCleartextTraffic="true"
android:networkSecurityConfig="@xml/network_security_config"
android:label="@string/app_name"
android:theme="@style/AppTheme"
android:persistent="true" >
Even with these changes when attempting to communicate via HTTP to 127.0.0.1 I see this in logcat:
08-09 10:50:34.395 30791 3607 D NetworkSecurityConfig: Using Network Security Config from resource network_security_config debugBuild: true
08-09 10:50:34.397 30791 3607 D NetworkSecurityConfig: Using Network Security Config from resource network_security_config debugBuild: true
08-09 10:50:34.401 30791 3607 W DownloadManager: [647] Stop requested with status HTTP_DATA_ERROR: Cleartext HTTP traffic to 127.0.0.1 not permitted
08-09 10:50:34.402 30791 3607 D DownloadManager: [647] Finished with status WAITING_TO_RETRY
EDIT: Update (21 Aug 2018) after "fixing" this issue it seems that a couple of hours after the app is installed the DownloadManager mysteriously stops accepting cleartext HTTP.
I can't explain what's happening. If I reboot the device things work great for a period of time then DownloadManager refuses cleartext again. I'm writing this off as an Android P bug that I hope gets resolved.
EDIT 2: Update (17 Jan 2019) my pixel2 is now running android 9 with a patch from 5 Jan 2019 and I no longer see the issue (so far). I'm guessing this got resolved in some patch since August.
解决方案
Create a XML res/xml/network_security_config.xml
Reference this file in your tag Application, inside AndroidManifest.xml. Like:
android:networkSecurityConfig="@xml/network_security_config"