CheckedTextView not checked

I want a Multiselected (checked) listview. When I select an item then the green check mark must appear. For this I use CheckedTextViews. The ListView gets the data from the database. I'm using a SimpleCursorAdapter for that. When you click on the button then the selected entries(IDs) will be passed to the next activity.

My problem is that the check marks of the CheckedTextView does not appear. But the IDs will be passed to the next activity. What am I doing wrong? How to fix it?

selecttest.xml

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

        <Spinner
        android:id="@+id/spinner_select_language"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true" />

        <Button
            style="@style/btn_Font"
            android:id="@+id/selecttest_start"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/spinner_test"
            android:onClick="onClick"
            android:text="@string/selecttest_start" />

        <ListView
            android:id="@+id/lv_lesson"
            android:layout_width="match_parent"
            android:layout_height="200dp"
            android:fadeScrollbars="false"
            android:choiceMode="multipleChoice"
            android:layout_alignParentLeft="true"
            android:cacheColorHint="#00000000"
            android:layout_below="@+id/selecttest_start" >
        </ListView>

</RelativeLayout>

dataset_ctv_lesson.xml

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

    <CheckedTextView
        style="@style/tv_Font"
        android:id="@+id/ctv_lesson"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:text="@string/none" 
        android:checkMark="@drawable/ctv_state_checker"
        />

</RelativeLayout>

ctv_state_checker.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:state_checked="false"
          android:drawable="@drawable/btn_check_buttonless_off" />
    <item android:state_checked="true"
          android:drawable="@drawable/btn_check_buttonless_on" />

</selector>

SelectTestActivity.java

public class SelectTestActivity 
extends Activity
implements OnItemSelectedListener 
{
    Database db;
    SimpleCursorAdapter adaptercursor, lv_adaptercursor;
    ListView lv_lesson;

    // Arraylist for checked item in the lesson view
    ArrayList<String> checkedlessons = new ArrayList<String>();

    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.selecttest);

        // Create Database
        db = new Database(this);

        // Drop-Down-Menu to select a language
        Spinner spinner_language = (Spinner) findViewById(R.id.spinner_select_language);
        spinner_language.setOnItemSelectedListener(this);

        Cursor cursor = db.createListViewCursor();

        String[] displaycolumn = new String[]{"language"};
        int[] displayview = new int[] {R.id.tv_language};

        adaptercursor = new SimpleCursorAdapter(this, R.layout.datasetlanguage, cursor, displaycolumn, displayview, 0);
        spinner_language.setAdapter(adaptercursor);

        // ListView to select a lesson
        lv_lesson = (ListView) findViewById(R.id.lv_lesson);

        cursor = db.createListViewLessonCursor(getSelectedItemIDFromSpinnerLanguage());

        displaycolumn = new String[]{"lesson"};
        int[] displayview2 = new int[] {R.id.ctv_lesson};

        lv_adaptercursor = new SimpleCursorAdapter(this, R.layout.dataset_ctv_lesson, cursor, displaycolumn, displayview2, 0);
        lv_lesson.setAdapter(lv_adaptercursor);

        lv_lesson.setOnItemClickListener(new ListView.OnItemClickListener() 
        {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) 
            {
                if (!checkedlessons.contains(Long.toString(id)))
                {
                    checkedlessons.add(Long.toString(id));

                    // checked textview
                    lv_lesson.setItemChecked(position, true);
                }
                else 
                {
                    checkedlessons.remove(Long.toString(id));

                    // unchecked textview
                    lv_lesson.setItemChecked(position, false);      
                }
            }
        });

        // Close the database
        db.close();
    }

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