Java Question @ActivityObject and exposed methods/properties

@ActivityObject
@ShortName("ABYoutube")
@Version(1.04f)
@Author("Alain Bailleul")
@Events(values={"Initialized(Success as Boolean, Message as String)"})
@Permissions(values={"android.permission.INTERNET"})
@DependsOn(values={"youtubeandroidplayerapi"})
public class ABYoutube extends YouTubeBaseActivity implements OnInitializedListener {
...

@Hide
@Override
public void someMethod() {
  super.someMethod();
}

package com.devil.signature;

import java.lang.Object;
import android.app.Activity;
import android.content.Context;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import android.os.Bundle;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.Signature;
import android.util.Base64;
import android.util.Log;


import anywheresoftware.b4a.*;
import anywheresoftware.b4a.BA;
import anywheresoftware.b4a.BA.Permissions;
import anywheresoftware.b4a.BA.ShortName;
import anywheresoftware.b4a.BA.*;


@Version(1.0f)
@ShortName("CheckSignature")
@Author("Devil-App")


/**
*
* @author Devil-App
*
*/

public class CheckSignature extends Activity{
private BA ba;


public static String getPackageName(final BA ba) {
        return ba.applicationContext.getPackageName();
    }

  
public String HashKey(String namepackage) {
......