from 4.xx google is using okhttp part of squareup
/**
* This implementation uses HttpEngine to send requests and receive responses. This class may use
* multiple HttpEngines to follow redirects, authentication retries, etc. to retrieve the final
* response body.
*
* <h3>What does 'connected' mean?</h3> This class inherits a {@code connected} field from the
* superclass. That field is <strong>not</strong> used to indicate whether this URLConnection is
* currently connected. Instead, it indicates whether a connection has ever been attempted. Once a
* connection has been attempted, certain properties (request header fields, request method, etc.)
* are immutable.
*/
public class HttpURLConnectionImpl extends HttpURLConnection {
private String defaultUserAgent() {
String agent = System.getProperty("http.agent");
return agent != null ? Util.toHumanReadableAscii(agent) : Version.userAgent();
}
https://github.com/square/okhttp/blob/master/okhttp-urlconnection/src/main/java/okhttp3/internal/huc/HttpURLConnectionImpl.java
http://square.github.io/okhttp/
everything depends on device - what os version u using because api is evolving, u can use reflections but u need know what field is on specific api
see https://github.com/square/okhttp/blob/master/CHANGELOG.md
to compare diffrent api versions use: https://android.googlesource.com/platform/external/okhttp/
u can try at the beginning
System.getProperty("http.agent");
edit:
via reflections
HttpURLConnection connection = (HttpURLConnection) new URL("http://google.com")
.openConnection();
Method method = connection.getClass().getDeclaredMethod("defaultUserAgent");
method.setAccessible(true);
String okEngineVersion = (String) method.invoke(connection, new Object[]{});
same as
String okEngineVersion = System.getProperty("http.agent");
and if u want to bother:
- every class is treated the same way - > as equals ( no versioning - u can only check magic minor major number - java compiler version from class)
- manifest of /system/framework/okhttp.jar doesn't contain version properties
if u want okhttp.internal.Version class then:
File file = new File("/system/framework/okhttp.jar");
// using javaxt-core lib
Jar jar = new Jar(file);
jar.getVersion();
// load dex
DexFile dexfile = DexFile.loadDex(file.getAbsolutePath(),
File.createTempFile("opt", "dex", _context.getCacheDir()).getPath(), 0);
Enumeration<String> dexEntries = dexfile.entries();
ClassLoader systemClassLoader = DexClassLoader.getSystemClassLoader();
while (dexEntries.hasMoreElements()) {
String className = dexEntries.nextElement();
Class<?> aClass = systemClassLoader.loadClass(className);
}
conclusion: If you want to avoid crash of app from library changes delivery
own version of library and load classes on the fly or compile with apk
