Android Parcelable object when returning loses its value

hoping they are well, I have a concern.

I have two activities 1) List of courses and their children are the activities - 2) Data and evaluation of the course activity

The process is as follows.

I select a course activity from a ExpandableListView which with the position of the group and its child I get the object Activity , previously filled. This happened to the activity (2) with an intent.

So far so good, my problem is when evaluating the activity. The change in the database is correct but when I do the set in the activity object, within the activity (2) the value is maintained, but when I go back the value is lost, since it does not update an image that I have in the list of activities of ExpandableListView

Activity Class

class Activity implements Parcelable{
private Integer id;
private String titlePref;
private String title;
private String teacher;
private String type = "";
private Integer evaluateContent = 0;
private Integer evaluateTeacher = 0;
private Integer canEvaluate = 0;
private Integer isAccomplished = 0;
private Integer isBlocked = 0;
private Integer hvVideo = 0;
private Video videoObj = null;
private String bannerUrl = "";
private String blockName = "";

//default constructor, for video or other who extends of Activity
public Activity(Integer id) { this.setId(id); }
public Activity(Integer id, String titlePref, String title, String teacher, Integer isAccomplished, Integer isBlocked, Integer hvVideo, String bannerUrl, String blockName)
{
    this.setId(id);
    this.setTitlePref(titlePref);
    this.setTitle(title);
    this.setTeacher(teacher);
    this.setIsAccomplished(isAccomplished);
    this.setIsBlocked(isBlocked);
    this.setHvVideo(hvVideo);
    this.setBannerUrl(bannerUrl);
    this.setBlockName(blockName);
}

private Activity(Parcel in)
{
    id              = in.readInt();
    titlePref       = in.readString();
    title           = in.readString();
    teacher         = in.readString();
    canEvaluate     = in.readInt();
    evaluateContent = in.readInt();
    evaluateTeacher = in.readInt();
    isAccomplished  = in.readInt();
    isBlocked       = in.readInt();
    hvVideo         = in.readInt();
    bannerUrl       = in.readString();
    blockName       = in.readString();
}

public static final Parcelable.Creator<Activity> CREATOR = new Parcelable.Creator<Activity>()
{
    @Override
    public Activity createFromParcel(Parcel in) {
        return new Activity(in);
    }

    @Override
    public Activity[] newArray(int size) {
        return new Activity[size];
    }
};

public int describeContents() {
    return 0;
}
public void writeToParcel(Parcel dest, int flags)
{
    dest.writeInt(id);
    dest.writeString(titlePref);
    dest.writeString(title);
    dest.writeString(teacher);
    dest.writeInt(canEvaluate);
    dest.writeInt(evaluateContent);
    dest.writeInt(evaluateTeacher);
    dest.writeInt(isAccomplished);
    dest.writeInt(isBlocked);
    dest.writeInt(hvVideo);
    dest.writeString(bannerUrl);
    dest.writeString(blockName);
}

public Integer getId() {
    return id;
}

public void setId(Integer id) {
    this.id = id;
}

public String getTitlePref() {
    return titlePref;
}

public void setTitlePref(String titlePref) {
    this.titlePref = titlePref;
}

public String getTitle() {
    return title;
}

public void setTitle(String title) {
    this.title = title;
}

public String getTeacher() {
    return teacher;
}

public void setTeacher(String teacher) {
    this.teacher = teacher;
}

public String getType() {
    return type;
}

public void setType(String type) {
    this.type = type;
}

public Integer getEvaluateContent() {
    return evaluateContent;
}

public void setEvaluateContent(Integer evaluateContent) {
    this.evaluateContent = evaluateContent;
}

public Integer getEvaluateTeacher() {
    return evaluateTeacher;
}

public void setEvaluateTeacher(Integer evaluateTeacher) {
    this.evaluateTeacher = evaluateTeacher;
}

public Integer getCanEvaluate() {
    return canEvaluate;
}

public void setCanEvaluate(Integer canEvaluate) {
    this.canEvaluate = canEvaluate;
}

public Integer getIsAccomplished() {
    return isAccomplished;
}

public void setIsAccomplished(Integer isAccomplished) {
    this.isAccomplished = isAccomplished;
}

public Integer getIsBlocked() {
    return isBlocked;
}

public void setIsBlocked(Integer isBlocked) {
    this.isBlocked = isBlocked;
}

public Integer getHvVideo() {
    return hvVideo;
}

public void setHvVideo(Integer hvVideo) {
    this.hvVideo = hvVideo;
}

public Video getVideoObj() {
    return videoObj;
}

public void setVideoObj(Video videoObj) {
    this.videoObj = videoObj;
}

public String getBannerUrl() {
    return bannerUrl;
}

public void setBannerUrl(String bannerUrl) {
    this.bannerUrl = bannerUrl;
}

public String getBlockName() {
    return blockName;
}

public void setBlockName(String blockName) {
    this.blockName = blockName;
}

public Video getVideo()
{
    return videoObj;
}
public Video makeVideo(String video){ return videoObj = new Video(this.getId(), video);}

So I pass the object to the other android activity (2):

listViewMyCoursesBlocks.setOnChildClickListener(new ExpandableListView.OnChildClickListener()
    {
        @Override
        public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id)
        {
            myActivity = (Activity)parent.getExpandableListAdapter().getChild(groupPosition,childPosition);
            if( myActivity.getIsBlocked() == 0 )
            {
                gPosition = groupPosition;
                cPosition = childPosition;
                Intent i = new Intent(getApplicationContext(), MyClassActivity.class);
                i.putExtra("myActivity", myActivity);
                startActivity(i);
                return true;
            }
            return  false;
        };
    });

I receive it like this:

Intent i = getIntent();
myActivity = i.getExtras().getParcelable("myActivity");

I make the set like this:

myActivity.setEvaluateTeacher(3);

When returning to the activity (1):

In my onResume I wanted to update an ExpandableListView image that indicates that this course activity is "evaluated".

but when doing

myActivity.getEvaluateTeacher();

Returns as value 0

I was reading and apparently in JAVA it does not work to pass a value by reference, but by value. Then each object should have value in its own "Android activity", if I did not understand wrong.

How can I set a value in my activity (2) and when I return to the activity (1) I can receive the value I gave ... and do something like:

listAdapter.notifyDataSetChanged();

To update the image of the list.

Thanks