How to solve Android P DownloadManager stopping with "Cleartext HTTP traffic to 127.0.0.1 not permitted"?
android, android-9.0-pie
Solution
Create a XML res/xml/network_security_config.xml
<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
<base-config cleartextTrafficPermitted="true" />
</network-security-config>
Reference this file in your tag Application, inside AndroidManifest.xml. Like:
android:networkSecurityConfig="@xml/network_security_config"
Problem
I have already defined a custom network security config and included it in my manifest as recommended here res/xml/network_security_config.xml: ``` <?xml version="1.0" encoding="utf-8"?> <network-security-config> <domain-config cleartextTrafficPermitted="true"> <domain includeSubdomains="true">127.0.0.1</domain> <domain includeSubdomains="true">localhost</domain> </domain-config> </network-security-config> ``` and this is in my Android.manifest: ``` <application android:icon="@drawable/icon" 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.