CODEWITHSUNDEEP
androidchromium
stacker
stacker

Reputation: 47

Where does 'mobile' keyword in the useragent come from in chromium?

I'm confused that on mobile devices(phone) on Android system, the useragent of chromium based browser(eg webview) have Mobile keyword, but on some mobile devices(eg tablets) it does not exist, so where is distinguished in the chrmoium code?

The mobile devices which have the Mobile keyword:

"Mozilla/5.0 (Linux; Android 5.1.1; Nexus 6 Build/LYZ28E) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.23 Mobile Safari/537.36"

Upvotes: 1

Views: 232

Answers (1)

bitchainer
bitchainer

Reputation: 535

Maybe you can check and reference the DeviceUtils.java and aw_content_client.cc in chromium source, it will check the device type by DeviceFormFactor.isTablet() in DeviceUtils.java to decide whether it need to add the Mobile keyword, and set the Mobile keyword in aw_content_client.cc, hopes this information can help you:

//DeviceUtils.java
package org.chromium.content.browser;

import android.content.Context;

import org.chromium.base.CommandLine;
import org.chromium.content.common.ContentSwitches;
import org.chromium.ui.base.DeviceFormFactor;

/**
 * A utility class that has helper methods for device configuration.
 */
public class DeviceUtils {

    /**
     * Appends the switch specifying which user agent should be used for this device.
     * @param context The context for the caller activity.
     */
    public static void addDeviceSpecificUserAgentSwitch(Context context) {
        if (DeviceFormFactor.isTablet(context)) {
            CommandLine.getInstance().appendSwitch(ContentSwitches.USE_MOBILE_UA);
        }
    }
}



   //aw_content_client.cc
   std::string GetUserAgent() {
  // "Version/4.0" had been hardcoded in the legacy WebView.
  std::string product = "Version/4.0 " + GetProduct();
  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
        switches::kUseMobileUserAgent)) {
    product += " Mobile";
  }
  return content::BuildUserAgentFromProductAndExtraOSInfo(
          product,
          GetExtraOSUserAgentInfo());
}

Upvotes: 1

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