代码清单1-3：ItemFragment.java
package com.enterpriseandroidbook.fragmentframework;
      
import android.app.ActionBar.Tab;
import android.app.ActionBar.TabListener;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.content.res.Configuration;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.FrameLayout;
      
public class ItemFragment extends Fragment implements TabListener, 
      TabbedActivity.SetData {

// String for logging the class name
private final String CLASSNAME = getClass().getSimpleName();

//Turn logging on or off
private final boolean L = true;

public void onAttach(Activity activity) {
super.onAttach(activity);

// Notification that the fragment is associated with an Activity
if (L) Log.i(CLASSNAME, "onAttach " + activity.getClass().getSimpleName());
}

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

// Notification that
Log.i(CLASSNAME, "onCreate");
}

public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState) {
FrameLayout content = (FrameLayout) inflater.inflate(R.layout.content, 
      container, false);
if (L) Log.i(CLASSNAME, "onCreateView");
return content;

}
      
public void onStart() {
super.onStart();
Log.i(CLASSNAME, "onStart");
}

public void onresume() {
super.onResume();
Log.i(CLASSNAME, "onResume");
}

public void onPause() {
super.onPause();
Log.i(CLASSNAME, "onPause");
}

public void onStop() {
super.onStop();
Log.i(CLASSNAME, "onStop");
}

public void onDestroyView() {
super.onDestroyView();
Log.i(CLASSNAME, "onDestroyView");
}

public void onDestroy() {
super.onDestroy();
Log.i(CLASSNAME, "onDestroy");
}

public void onDetach() {
super.onDetach();
Log.i(CLASSNAME, "onDetach");
}

///////////////////////////////////////////////////////////////////////
// Minor lifecycle methods
///////////////////////////////////////////////////////////////////////

public void onActivityCreated() {
// Notification that the containing activiy and its View hierarchy exist
Log.i(CLASSNAME, "onActivityCreated");
}

///////////////////////////////////////////////////////////////////////
// Overrides of the implementations ComponentCallbacks methods in Fragment
///////////////////////////////////////////////////////////////////////

@Override
public void onConfigurationChanged(Configuration newConfiguration) {
super.onConfigurationChanged(newConfiguration);

// This won't happen unless we declare changes we handle in the manifest
if (L) Log.i(CLASSNAME, "onConfigurationChanged");
}

@Override
public void onLowMemory() {
// No guarantee this is called before or after other callbacks
if (L) Log.i(CLASSNAME, "onLowMemory");
}

///////////////////////////////////////////////////////////////////////
// Implementation of TabListener
///////////////////////////////////////////////////////////////////////

同所有需要响应生命周期方法的其他类一样，这里实现了这些方法并记录了日志。所以你可以很容易地看到何时调用它们。

以下三个方法实现TabListener接口。把它们传入一个FragmentTransaction对象，该对象聚合了在片段之间导航时所发生的所有操作。这里，只需显示或隐藏片段。
 

@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub

}
      
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
ft.show(this);

}
      
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
ft.hide(this);

}

///////////////////////////////////////////////////////////////////////
// Implementation of SetData
///////////////////////////////////////////////////////////////////////
下面是setData()方法，它实现SetData接口。此接口告诉片段哪些数据应该显示。
@Override
public void setData(Bundle data) {
// Display the number
EditText t = (EditText) getActivity().findViewById(R.id.editText1);
int i = data.getInt("place");
t.setText(Integer.toString(i));
}
      
}