android.webkit.WebSettings#getDefaultUserAgent ( )源码实例Demo

/**
 * 获取UserAgent
 *
 * @return UserAgent
 */
@NonNull
public static String getUserAgent() {
    String userAgent = "";
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
        try {
            userAgent = WebSettings.getDefaultUserAgent(AppUtils.getContext());
        } catch (Exception e) {
            userAgent = System.getProperty("http.agent");
        }
    } else {
        userAgent = System.getProperty("http.agent");
    }
    StringBuffer sb = new StringBuffer();
    for (int i = 0, length = userAgent.length(); i < length; i++) {
        char c = userAgent.charAt(i);
        if (c <= '\u001f' || c >= '\u007f') {
            sb.append(String.format("\\u%04x", (int) c));
        } else {
            sb.append(c);
        }
    }
    return sb.toString();
}
 

private void toggleDesktopMode(boolean enabled) {
    WebSettings settings = web.getSettings();

    settings.setLoadWithOverviewMode(enabled);
    settings.setUseWideViewPort(enabled);

    settings.setSupportZoom(enabled);
    settings.setBuiltInZoomControls(enabled);
    settings.setDisplayZoomControls(!enabled);

    String userAgent = enabled ? "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.4) Gecko/20100101 Firefox/4.0" : WebSettings.getDefaultUserAgent(this);
    userAgent += " Aria2App/" + BuildConfig.VERSION_NAME + "-" + BuildConfig.FLAVOR;
    settings.setUserAgentString(userAgent);
}
 

public boolean isWebViewFound(Context context) {
    if (webViewFound == null) {
        try {
            WebSettings.getDefaultUserAgent(context);
            webViewFound = true;
        } catch (Exception e) {
            webViewFound = false;
        }
    }
    return webViewFound;
}
 

public static String getUserAgent(Context context) {
    if (sUserAgent != null) {
        return sUserAgent;
    }
    String agent = context == null ? "" : WebSettings.getDefaultUserAgent(context);
    sUserAgent = agent + " ; MaterialUp-App/" + BuildConfig.VERSION_CODE;
    return sUserAgent;
}
 

/**
 * Gets ua.
 *
 * @return the ua
 */
public final String getUA() {
  final String systemUa = System.getProperty("http.agent");
  String result;
  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
    result = WebSettings.getDefaultUserAgent(context) + "__" + systemUa;
  } else {
    result = new WebView(context).getSettings().getUserAgentString() + "__" + systemUa;
  }
  return CheckValidityUtil.checkValidData(result);
}
 

private String getUserAgent() {
    if (Build.VERSION.SDK_INT < 19) {
        WebView webView = new WebView(this);
        WebSettings settings = webView.getSettings();
        return settings.getUserAgentString();
    }

    // api >= 19
    return WebSettings.getDefaultUserAgent(this);
}
 

public static int getChromeVersion(Context context) {
    String chromeString = "Chrome/";
    String defaultUserAgent = WebSettings.getDefaultUserAgent(context);
    if (defaultUserAgent.contains(chromeString)) {
        int chromeIndex = defaultUserAgent.indexOf(chromeString);
        int dotIndex = defaultUserAgent.indexOf('.', chromeIndex);
        String version = defaultUserAgent.substring(chromeIndex + chromeString.length(), dotIndex);
        return Integer.parseInt(version);
    } else return -1;
}
 

@ReactMethod(isBlockingSynchronousMethod = true)
public String getUserAgentSync() {
  try {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
      return WebSettings.getDefaultUserAgent(getReactApplicationContext());
    } else {
      return System.getProperty("http.agent");
    }
  } catch (RuntimeException e) {
    return System.getProperty("http.agent");
  }
}
 

public static void getUserAgent(Context context) {
    WebSettings.getDefaultUserAgent(context);
}