Fragmentによる簡単なデータインタラクション

前の文に続いてFragmentの使用を研究し続けて、本文は主にこのような簡単な応用を実現します:左側にタイトルバーを表示して、それからそれをクリックして、右側に異なる内容を表示して、内容は需要によって自分で相応の変化をします.コードは次のとおりです.
MainActivity:

package com.home.testfragment;

import com.home.testfragment.TitleFragment.OnTitleSelectedListener;

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.widget.TextView;

public class MainActivity extends FragmentActivity implements
		OnTitleSelectedListener {
	public static String[] names = { "  ", "  ", "  ", "  ", "  ", "  ", "  ",
			"  ", "  " };
	private TextView detailText;

	@Override
	protected void onCreate(Bundle arg0) {
		super.onCreate(arg0);
		setContentView(R.layout.main);
		detailText = (TextView) findViewById(R.id.main_tv_detail);
	}

	@Override
	public void OnShowDetails(int position) {
		detailText.setText("  " + names[position]);
	}
}

TitleFragment:

package com.home.testfragment;

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class TitleFragment extends ListFragment {
	OnTitleSelectedListener mCallBack;

	public interface OnTitleSelectedListener {
		public void OnShowDetails(int position);
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		return inflater.inflate(R.layout.fragment_title, container, false);
	}

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setListAdapter(new ArrayAdapter<String>(getActivity(),
				android.R.layout.simple_list_item_1, MainActivity.names));
	}

	@Override
	public void onAttach(Activity activity) {
		super.onAttach(activity);
		try {
			mCallBack = (OnTitleSelectedListener) activity;
		} catch (ClassCastException e) {
			e.printStackTrace();
		}
	}

	@Override
	public void onListItemClick(ListView l, View v, int position, long id) {
		super.onListItemClick(l, v, position, id);
		mCallBack.OnShowDetails(position);
	}
}

main.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" >

    <fragment
        android:id="@+id/main_FirstFragment"
        android:name="com.home.testfragment.TitleFragment"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1" />

    <TextView
        android:id="@+id/main_tv_detail"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginLeft="20dp"
        android:layout_weight="0.5"
        android:textSize="40sp" />

</LinearLayout>

fragment_title.xml:

<?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:orientation="vertical" >

    <ListView
        android:id="@id/android:list"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:drawSelectorOnTop="false" />

</LinearLayout>

画像の効果を添付します.