Android Extended ListView

I created my own ListView class (extended with TouchEvent detection)

public class MyListView extends ListView{
private ScaleGestureDetector myScaleDetector;
private float myScaleFactor = 1.f;

    public MyListView(Context context) {
        super(context);
        myScaleDetector = new ScaleGestureDetector(context, new myScaleListener());
    }

    @Override
    public boolean onTouchEvent(MotionEvent e) {
        myScaleDetector.onTouchEvent(e);
        return super.onTouchEvent(e);
    }

    private class myScaleListener extends ScaleGestureDetector.
            SimpleOnScaleGestureListener {
        @Override
        public void onScaleEnd(ScaleGestureDetector detector) {
            int a=3; //just for breakpoint
        }
    }

}

this is how i define it in layout contacts_activity.xml

<com.my.aclient.ui.MyListView
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:id="@+id/listView"/>

But application is getting RuntimeException on line where this contacts_activity.xml file is inflated

this.setContentView(R.layout.contacts_activity);

Error reported in Logcat stacktrace

Binary XML file line #106: Error inflating class com.my.aclient.ui.MyListView

When i use only ListView everything works perfectly. What could make this problem?