[android help] gridView vertical separator not visible in android

I generated a custom grid view, by passing to my adapter an ArrayList with Arrays of Strings.

Everything is working fine, my gridView is generated as I want (every String Array represents a column in my gridView).

The only problem is, that I can not see vertical separators in the gridview, only the horizontal ones are visible. I really need the vertical separators as well. Please help me with this.

Here is my xml

    android:id="@+id/gridview"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:columnWidth="130dp"
    android:horizontalSpacing="10dp"
    android:verticalSpacing="10dp"
    android:gravity="center"
    android:stretchMode="columnWidth"/>

Here is my code

ArrayList list = new ArrayList();
String [] id = {"IDs", "S001","S002","S003","S004","S005","S006","S007"};
String [] name = {"NAMES", "Rohit","Rahul","Ravi","Amit","Arun","Anil","Kashif"};
String [] products = {"Products", "Bear","Tea","Apple","Food","Color","Program","Telephone"};
String [] stuff = {"Stuffs", "Stuff_01","Stuff_02","Stuff_03","Stuff_04","Stuff_05","Stuff_06","Stuff_07"};
list.add(id);
list.add(name);
list.add(products);
list.add(stuff);

gridview = (GridView) findViewById(R.id.gridview);  
gridview.setAdapter(new DataAdapter(this, list));

My Custom Adapter

public class DataAdapter extends BaseAdapter {

Context mContext;
private ArrayList list;
private LayoutInflater mInflater;
private ArrayList layouts = new ArrayList();

public DataAdapter(Context c, ArrayList myList)
{
    mContext=c;
    mInflater = LayoutInflater.from(c);

    list = myList;
}

@Override
public int getCount()
{
    return list.get(0).length;
}

@Override
public Object getItem(int position)
{
    return layouts.get(position);
}

@Override
public long getItemId(int position)
{
    return position;
}


@Override
public View getView(int position, View convertView, ViewGroup parent)
{    
    LinearLayout view;

    if (convertView == null) {
        view = new LinearLayout(mContext);

        for (int i = 0; i < list.size(); i++) {

            TextView tv = new TextView(mContext);
            tv.setLayoutParams(new GridView.LayoutParams(80, 30));

            view.addView(tv);   
        }

        layouts.add(position, view);
    }
    else {
        view = (LinearLayout) convertView;
    }

    for (int i = 0; i < view.getChildCount(); i++) {
        TextView tv = (TextView) view.getChildAt(i);
        tv.setText(list.get(i)[position]);
    }

    view.setBackgroundColor(Color.BLUE);

    return view;
}

}

.

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