android – listview setItemChecked不起作用

String[] str = getresources().getStringArray(R.array.brush_typE);
sizeArrayAdapter = new ArrayAdapter<String>(this.getContext(),R.layout.drawing_list_item,str);

listType = SIZE_LIST;
listView.setAdapter(sizeArrayAdapter);

// Populate the listView
listView.setItemchecked(4,truE);

这是列表项：

<checkedTextView
        xmlns:android="http://scheR_335_11845@as.android.com/apk/res/android"
        android:id="@+id/drawingcheckedTextView"
        android:layout_width="fill_parent"
        android:layout_height="?android:attr/listPreferredItemHeight"
        android:gravity="center_vertical"
        android:checkmark="?android:attr/listChoiceInDicatorSingle"
        android:BACkground="@drawable/list_panel"
        android:paddingLeft="6dip"
        android:paddingRight="6dip"/>

请帮帮我.