ERR_INVALID_RESPONSE when loading webView in android 9
Question
My code is working very good in android below 9, but in android 9 I have a problem with webView when loading a resource and it show me the error message:
"Web page not available The web page at data:text/html; charset=utf-8;charset=utf-8;base64, could not be loaded because: net::ERR_INVALID_RESPONSE"
I think the problem is from UTF8 in android 9. I find this:
In Android 9, the UTF-8 decoder for Java language is stricter and follows the Unicode standard.
in android-9.0-migration https://developer.android.com/about/versions/pie/android-9.0-migration
My code is:
public void loadResourcePage() {
loadDataWithBaseURL(basePath, "<html><body><p> some text </p></body></html>", "text/html", "UTF-8", null); }
2 answers
solution1
0 2019-07-02 05:21:49
The documents at this page (https://developer.android.com/about/versions/pie/android-9.0-migration) mention that:
In Android 9, the UTF-8 decoder for Java language is stricter and follows the Unicode standard.
So try converting the UTF-8 into Base64 and use loadData()
try {
String base64 = null;
base64 = android.util.Base64.encodeToString(lecureHtmlData.getBytes("UTF-8"),
android.util.Base64.DEFAULT);
wvLecture.loadData(base64, "text/html; charset=utf-8", "base64");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
solution2
-1 2019-07-01 08:29:18
Actually you should avoid using http, but if there is no way you can do this:
Add @xml/network_security_config into your resources:
<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
<domain-config cleartextTrafficPermitted="true">
<domain includeSubdomains="true">www.smedk.ru</domain>
</domain-config>
</network-security-config>
Add this security config to your Manifest like this:
<application
...
android:networkSecurityConfig="@xml/network_security_config"
...>
...
</application>
Now you allowed using HTTP connection on www.smedk.ru subdomains.
You can read more in https://developer.android.com/training/articles/security-config#CleartextTrafficPermitted
Note: The guidance in this section applies only to apps that target Android 8.1 (API level 27) or lower. Starting with Android 9 (API level 28), cleartext support is disabled by default.
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