<?xml version="1.0" encoding="utf-8"?>

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:id="@+id/fragment"

    android:layout_width="match_parent"

    android:layout_height="match_parent">

</FrameLayout>

public class MainActivity extends AppCompatActivity implements ItemFragment.OnListFragmentInteractionListener{

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

　　　　　　
　　　　　// 新增传递ItemFrament

        ItemFragment f =  ItemFragment.newInstance (1);

        getSupportFragmentManager().beginTransaction().add(R.id.fragment, f).commit();

    }

　　 // 实现接口

    @Override

    public void onListFragmentInteraction(DummyContent.DummyItem item) {

    }