i want use fragment this way ,but failed

i check many pages ,want to find a way use fragment in a page,but find nothing, so i decide myself to resolved this problem,i use this way,this my renderer,

        [assembly: ExportRenderer(typeof(Student.BaiduMapView), typeof(Student.BaiduMapViewRenderer))]
        namespace Student
        {
            public class BaiduMapViewRenderer:ViewRenderer
            {
                public BaiduMapViewRenderer ()
                {

                }
                protected override void OnElementChanged (ElementChangedEventArgs<View> e)
                {
                    base.OnElementChanged (e);

                    Android.Views.LayoutInflater layoutInflater = Android.Views.LayoutInflater.FromContext(this.Context); 
                    Android.Views.View view = layoutInflater.Inflate (Resource.Layout.chatlistfragment, null);
                    this.AddView (fr.View);
                }
            }
}

this is the layout chatlistfragment,

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:baselineAligned="false" >
    <fragment
        android:id="@+id/fragment1"
        android:name="student.TestFragment"
        android:layout_width="0dip"
        android:layout_height="match_parent"
        android:layout_weight="1" />
</LinearLayout>

but when i run,i meet a exception, Error inflating class fragment,if i remove fragment,the exception gone,i sure there have no error in the test fragment,because i have test it in a activity.
why ?i can't layoutInflater a layout containing a fragment?and how can i get a view of fragment and add to a page.