DexClassLoader loader = new DexClassLoader("/sdcard/classes.dex";, = getApplicationInfo().dataDir, null, getClass().getClassLoader());
    try {
        Class cl = classLoader.loadClass("com.example.myapplication.MyService");
        Method meth = cl.getMethod("onStartCommand", Intent.class, int.class, int.class);
        meth.invoke(c.newInstance(), null);
    } catch (Exception e) {
        e.printStackTrace();
    }