public void run() {
	
	try {

		File dummyClass = copy("net/metropy/SamplePackage.class");
		
		
		
		URL[] urls = new URL[] {mainActivity.getFilesDir().toURL()};
		
		ClassLoader cl = new URLClassLoader(urls);
		
		
		Class cls = cl.loadClass("net.metropy.SamplePackage");
		
		Object object = cls.newInstance();
		
		Method m = cls.getDeclaredMethod("getSample", null);
		
		String retr = (String) m.invoke(object, null);
		
		
	} catch (Exception e) {
		e.printStackTrace();
	}
}

private File copy(String file) {
	
	InputStream is;
	try {
		is = mainActivity.getAssets().open(file);
		File dummyClass = new File(mainActivity.getFilesDir().getAbsoluteFile()+file);
		dummyClass.getParentFile().mkdirs();
		if(dummyClass.exists()) {
			dummyClass.delete();
			dummyClass.createNewFile();
		}
		
		FileOutputStream os = new FileOutputStream(dummyClass);
		
		byte[] buffer = new byte[1000];
		int bytes;

	    
	    while ((bytes = is.read(buffer)) != -1)
	    {
	        os.write(buffer, 0, bytes);
	    }
		
		os.close();
		is.close();
		
		return dummyClass;
		
	} catch (IOException e) {
		e.printStackTrace();
	}
	
	return null;
}