How to focus an item in Gridview

Question

I am trying a calendar application. I used Baseadapter and Gridview for work the calendar. I want, when an user clicks an item in calendar, clicked items change background color.

I found several methods for this. setSelection method, requestFocus method etc. Then I decided using the requestFocus.

My Problem

When I click an item in calendar, It sends requestFocus and everything is okay. Then I click another item and It works okay. Main problem starts here, When I click an item that I've already clicked on, It doesn't work. So an item works only once. I hope you can understand my question. Please suggest a solution to me.

thank you.

PlaceholderFragment.java

calendarAdapter = new CalendarAdapter( whole_list, getActivity() );

        calendarGridView = ( GridView ) rootView.findViewById( R.id.calendarGridView );
        calendarGridView.setAdapter( calendarAdapter );
        calendarGridView.setOnItemClickListener( new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick( AdapterView< ? > parent, View view, int position, long id ) {
                DaysSettings get_spesific = whole_list.get( position );

                RelativeLayout r = ( RelativeLayout ) view.findViewById( R.id.calendar_border );
                r.setFocusable( true );
                r.setFocusableInTouchMode( true );
                r.requestFocus();
            }
        } );

calendar_inflate.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:orientation="vertical"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                >

    <RelativeLayout
        android:background="@drawable/selector"
        android:layout_marginTop="@dimen/calendar_rl_margin"
        android:layout_marginBottom="@dimen/calendar_rl_margin"
        android:layout_width="@dimen/calendar_circle_wh"
        android:layout_height="@dimen/calendar_circle_wh"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:id="@+id/calendar_border">

        <RelativeLayout
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:id="@+id/calendarparentlayout"
            android:layout_margin="1dp"
            >
            <ImageView
                android:contentDescription="Cinsel ilişki olduğunda kalp işareti çıkması için kullanılır."
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/had_sex"
                android:src="@drawable/heart"
                android:layout_alignParentTop="true"
                android:layout_alignParentRight="true"
                android:layout_alignParentEnd="true"
                android:background="@drawable/circle_white"
                android:padding="3dp"
                android:visibility="gone"
                />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="10sp"
                android:text="0"
                android:id="@+id/calendarTextiew"
                android:textColor="@color/main_color_one"
                android:layout_centerHorizontal="true"
                android:layout_centerVertical="true"
                />

            <LinearLayout
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:layout_below="@id/calendarTextiew"
                android:gravity="center_horizontal">

                <ImageView
                    android:contentDescription="İlaç hatırlatırıcı resmidir."
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:id="@+id/medicine_reminder"
                    android:src="@drawable/pill"
                    android:layout_marginRight="2dp"
                    android:layout_marginLeft="2dp"
                    android:visibility="gone"
                    />

                <ImageView
                    android:contentDescription="Note eklendi resmidir."
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:id="@+id/adding_note"
                    android:src="@drawable/plus"
                    android:layout_marginRight="2dp"
                    android:layout_marginLeft="2dp"
                    android:visibility="gone"
                    />
            </LinearLayout>
        </RelativeLayout>
    </RelativeLayout>
</RelativeLayout>