Allow clear-text traffic (sync with http://) explicitly for Android 9

app/src/main/java/at/bitfire/davdroid/ui/CollectionInfoFragment.kt

@@ -10,14 +10,9 @@ package at.bitfire.davdroid.ui
 
 import android.annotation.SuppressLint
 import android.app.Dialog
-import android.content.ClipData
-import android.content.ClipboardManager
-import android.content.Context
-import android.net.Uri
 import android.os.Bundle
 import android.support.v4.app.DialogFragment
 import android.support.v7.app.AlertDialog
-import android.widget.Toast
 import at.bitfire.davdroid.R
 import at.bitfire.davdroid.model.CollectionInfo
 import kotlinx.android.synthetic.main.collection_properties.view.*

app/src/main/res/xml/network_security_config.xml

@@ -8,7 +8,7 @@
   -->
 
 <network-security-config>
-    <base-config>
+    <base-config cleartextTrafficPermitted="true">
         <trust-anchors>
             <certificates src="system"/>
             <certificates src="user"/>