9.0后 下载默认 https协议,如要http下载 请修改 :
AndroidManifest.xml
加一句 :android:usesCleartextTraffic="true"
<?xml version="1.0" encoding="utf-8"?>
<manifest ...>
<uses-permission android:name="android.permission.INTERNET" />
<application
...
android:usesCleartextTraffic="true"
...>
...
</application>
</manifest>