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how to get the default HTTP USER AGENT from the android device?

Posted by: admin May 14, 2020 Leave a comment

Questions:

How to get the default HTTP USER AGENT and its default settings from the android device?

thanks
Nohsib

How to&Answers:

Edit: See Prakash’s answer, which is better for 2.1+.

Try http://developer.android.com/reference/android/webkit/WebSettings.html#getUserAgentString

Note that this User Agent will only apply for the embedded WebKit browser that’s used by default in Android. Unfortunately, you’ll need to create a new WebView object to get the user agent. Fortunately, the user agent doesn’t change often, so you should only need to run this code once in your application lifetime (unless don’t care about performance). Just do:

String userAgent = new WebView(this).getSettings().getUserAgentString();

Alternatively, you can use the JavaScript method navigator.getUserAgent().

Answer:

as Varundroid mentioned in his answer,

String userAgent = System.getProperty("http.agent"); 

is better way to do it for Android 2.1 and above.

====================

From android source code.

public static String getDefaultUserAgent() {
    StringBuilder result = new StringBuilder(64);
    result.append("Dalvik/");
    result.append(System.getProperty("java.vm.version")); // such as 1.1.0
    result.append(" (Linux; U; Android ");

    String version = Build.VERSION.RELEASE; // "1.0" or "3.4b5"
    result.append(version.length() > 0 ? version : "1.0");

    // add the model for the release build
    if ("REL".equals(Build.VERSION.CODENAME)) {
        String model = Build.MODEL;
        if (model.length() > 0) {
            result.append("; ");
            result.append(model);
        }
    }
    String id = Build.ID; // "MASTER" or "M4-rc20"
    if (id.length() > 0) {
        result.append(" Build/");
        result.append(id);
    }
    result.append(")");
    return result.toString();
}   

Answer:

When you use web view to access the user-agent, make sure you run the

new WebView(this).getSettings().getUserAgentString();

on the UI thread.

If you want access the user agent on background thread.
use

System.getProperty("http.agent")

To check whether a user-agent is valid or not use this
https://deviceatlas.com/device-data/user-agent-tester

Answer:

An alternative

if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN_MR1) {
    String userAgent = WebSettings.getDefaultUserAgent(context);
}