无法将自定义listSelector应用于ListView

您正在列表项内使用ImageButton。因此，无论何时单击该项目，ImageButton都会获得焦点。

但是在您的情况下，您将ImageButton设置为背景

  android:background="@null"

它使您看不到焦点。如果删除此行，则可以看到问题。

要从列表项获得焦点，可以在xml的根视图中使用此代码。

android:descendantFocusability="blocksDescendants"   

<?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="wrap_content"
    android:descendantFocusability="blocksDescendants" 
    android:padding="5dp">

    <ImageButton android:id="@+id/contextMenuIcon"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_action_overflow"
        android:background="@null"/>

    <TextView android:id="@+id/noteTitle"
        android:layout_alignParentLeft="true"
        android:layout_toLeftOf="@id/contextMenuIcon"
        android:layout_alignBottom="@id/contextMenuIcon"
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:layout_alignParentTop="true"
        android:textIsSelectable="false"
        android:ellipsize="end"
        android:singleLine="true"
        android:textSize="20sp"
        android:textColor="@android:color/black"/>

    <TextView android:id="@+id/noteCreationDate"
        android:layout_alignParentLeft="true"
        android:layout_alignParentBottom="true"
        android:layout_below="@id/noteTitle" 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="18sp"
        android:textColor="#808080"/>

    <TextView android:id="@+id/notePrivacy"
        android:layout_alignParentRight="true"
        android:layout_alignParentBottom="true"
        android:layout_below="@id/contextMenuIcon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="18sp"
        android:textColor="#808080" />

</RelativeLayout>  

我用您的xml创建了一个快速测试，它可以正常工作。

public class MainActivity extends ActionBarActivity {

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

        if (savedInstanceState == null) {
            getSupportFragmentManager().beginTransaction().add(R.id.container, new PlaceholderFragment()).commit();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    /**
     * A placeholder fragment containing a simple view.
     */
    public class PlaceholderFragment extends Fragment {

        public PlaceholderFragment() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_main, container, false);

            ListView list = (ListView)rootView.findViewById(R.id.list);

            ArrayList<MyItem> listItem = genListItem(20);
            MyAdapter adapter = new MyAdapter(MainActivity.this, android.R.layout.simple_list_item_1, listItem);
            list.setAdapter(adapter);


            return rootView;
        }

        private ArrayList<MyItem> genListItem(int size) {
            ArrayList<MyItem> listItem = new ArrayList<MainActivity.MyItem>();
            for (int i = 0; i < size; i++) {
                MyItem item = new MyItem();
                item.setName("item " + i);
                listItem.add(item);
            }

            return listItem;
        }
    }

    public static class MyItem{
        String Name;
        /**
         * @return the name
         */
        public String getName() {
            return Name;
        }
        /**
         * @param name the name to set
         */
        public void setName(String name) {
            Name = name;
        }


    }

    public class MyAdapter extends ArrayAdapter<MyItem>{

        private LayoutInflater inflator;
        private Context mContext;
        public MyAdapter(Context context, int resource, List<MyItem> objects) {
            super(context, resource, objects);
            mContext = context;
            inflator = ((Activity) context).getLayoutInflater();
        }

        @Override
        public View getView(final int position, View convertView, ViewGroup parent) {

            final ViewHolder holder;
            if (convertView == null) {
                convertView = inflator.inflate(R.layout.list_entry, null);
                holder = new ViewHolder();
                holder.Name = (TextView) convertView.findViewById(R.id.noteTitle);
                convertView.setTag(holder);
            } else {
                holder = (ViewHolder) convertView.getTag();
            }

            MyItem item = getItem(position);
            holder.Name.setText(item.getName());


            return convertView;
        }

        class ViewHolder {
            public TextView Name;
        }


    }

}