Loading a remote Java class

Question

I built an android app.

I use an advertising platform, but I'm not sure I would like to stick to it (maybe I'll decide to change it later).

For this purpose, I would like to create an interface, and a class implementing it, calling the ads of the platform.

The idea is that I could later at some point, load another class file from my server (with reflection) replacing the previous one. That way, I will be able to change advertising platform "on the fly" (for instance - Admob/Airpush).

Does someone know how can I load remote classes with Java?

Do you have any code example the shows it?

Have you heard about invention called "API"? Instead of doing hard stuff with i.e. CORBA, wrap your Add provided in own API — Marcin Orlowski, May 12 '14 at 21:53
@MarcinOrlowski, you are right, but sometimes you have some legacy code/systems you need to deal with it! — mohamed.Yassine.SOUBKI, Dec 06 '21 at 09:40

score 2 · Accepted Answer · edited May 23 '17 at 12:01

You need to create your own ClassLoader, give a look at How to use URLClassLoader to load a *.class file?

Here is an example (from http://www.programcreek.com/java-api-examples/index.php?api=java.net.URLClassLoader, there is others with hosted urls):

private void invokeClass(String path, String name, String[] args) throws
        ClassNotFoundException,
        NoSuchMethodException,
        InvocationTargetException,
        MalformedURLException,
        InterruptedException,
        IllegalAccessException {
    File f = new File(path);
    URLClassLoader u = new URLClassLoader(new URL[]{f.toURI().toURL()});
    Class c = u.loadClass(name);
    Method m = c.getMethod("main", new Class[]{args.getClass()});
    m.setAccessible(true);
    int mods = m.getModifiers();
    if (m.getReturnType() != void.class || !Modifier.isStatic(mods) || !Modifier.isPublic(mods)) {
        throw new NoSuchMethodException("main");
    }
    m.invoke(null, new Object[]{args});
    m = null;
    System.gc(); // uh-oh
}

Loading a remote Java class

1 Answers1