1.Fragment的生命周期：
简单在新建一个MyFragment继承自Fragment，重写各个生命周期回调方法，各个方法中直接输出标识相关函数被调用的信息。
重写MainActivity的各个生命周期回调方法，同样输出标识信息。
MyFragment.java：
1 public class MyFragment extends Fragment { 2 3 @Override 4 5 public void onActivityCreated(Bundle savedInstanceState) { 6 7 // TODO Auto-generated method stub 8 9 super.onActivityCreated(savedInstanceState); 10 11 Log.i("FRAGMENT","onActivityCreated()"); 12 13 } 14 15 @Override 16 17 public View onCreateView(LayoutInflater inflater, ViewGroup container, 18 19 Bundle savedInstanceState) { 20 21 // TODO Auto-generated method stub 22 23 Log.i("FRAGMENT","onCreateView()"); 24 25 TextView textView = new TextView(getActivity()); 26 27 textView.setText("This is a fragment"); 28 29 return textView; 30 31 } 32 33 @Override 34 35 public void onDestroyView() { 36 37 // TODO Auto-generated method stub 38 39 super.onDestroyView(); 40 41 Log.i("FRAGMENT","onDestroyView()"); 42 43 } 44 45 @Override 46 47 public void onAttach(Activity activity) { 48 49 // TODO Auto-generated method stub 50 51 super.onAttach(activity); 52 53 Log.i("FRAGMENT","onAttach()"); 54 55 } 56 57 @Override 58 59 public void onCreate(Bundle savedInstanceState) { 60 61 // TODO Auto-generated method stub 62 63 super.onCreate(savedInstanceState); 64 65 Log.i("FRAGMENT","onCreate()"); 66 67 } 68 69 @Override 70 71 public void onStart() { 72 73 // TODO Auto-generated method stub 74 75 super.onStart(); 76 77 Log.i("FRAGMENT","onStart()"); 78 79 } 80 81 @Override 82 83 public void onResume() { 84 85 // TODO Auto-generated method stub 86 87 super.onResume(); 88 89 Log.i("FRAGMENT","onResume()"); 90 91 } 92 93 @Override 94 95 public void onPause() { 96 97 // TODO Auto-generated method stub 98 99 super.onPause();100 101 Log.i("FRAGMENT","onPause()");102 103 }104 105 @Override106 107 public void onStop() {108 109 // TODO Auto-generated method stub110 111 super.onStop();112 113 Log.i("FRAGMENT","onStop()");114 115 }116 117 @Override118 119 public void onDestroy() {120 121 // TODO Auto-generated method stub122 123 super.onDestroy();124 125 Log.i("FRAGMENT","onDestroy()");126 127 }128 129 @Override130 131 public void onDetach() {132 133 // TODO Auto-generated method stub134 135 super.onDetach();136 137 Log.i("FRAGMENT","onDetach()");138 139 }140 141 }
注意：onCreateView()方法中需返回一个View对象。
MainActivity.java:
1 public class MainActivity extends ActionBarActivity { 2 3 @Override 4 5 protected void onCreate(Bundle savedInstanceState) { 6 7 super.onCreate(savedInstanceState); 8 9 setContentView(R.layout.activity_main);10 11 Log.i("ACTIVITY","onCreate()");12 13 }14 15 @Override16 17 protected void onStop() {18 19 // TODO Auto-generated method stub20 21 super.onStop();22 23 Log.i("ACTIVITY","onStop()");24 25 }26 27 @Override28 29 protected void onDestroy() {30 31 // TODO Auto-generated method stub32 33 super.onDestroy();34 35 Log.i("ACTIVITY","onDestroy()");36 37 }38 39 @Override40 41 protected void onPause() {42 43 // TODO Auto-generated method stub44 45 super.onPause();46 47 Log.i("ACTIVITY","onPause()");48 49 }50 51 @Override52 53 protected void onResume() {54 55 // TODO Auto-generated method stub56 57 super.onResume();58 59 Log.i("ACTIVITY","onResume()");60 61 }62 63 @Override64 65 protected void onStart() {66 67 // TODO Auto-generated method stub68 69 super.onStart();70 71 Log.i("ACTIVITY","onStart()");72 73 }74 75 @Override76 77 protected void onRestart() {78 79 // TODO Auto-generated method stub80 81 super.onRestart();82 83 Log.i("ACTIVITY","onRestart()");84 85 }86 87 }
布局文件：
1 <fragment2 3 android:id="@+id/frag"4 5 android:name="cn.csc.fragment.MyFragment"6 7 android:layout_width="wrap_content"8 9 android:layout_height="wrap_content"/>
注意，添加的fragment需要通过name属性指定自己新建的fragment的权限定名。
运行结果：
按下模拟器的BACK按钮：
中间插入了dalvik的垃圾回收，不过整体的顺序是没有改变的：
整个生命周期各个回调函数的调用过程如下：
显示到前台：
MyFragment onAttach() 附加到activity上
MyFragment onCreate() fragment创建
MyFragment onCreateView() fragment创建自己的视图
MainActivity onCreate() activity创建
MyFragment onActivityCreated()
MainActivity onStart()
MyFragment onStart()
MainActivity onResume()
MyFragment onResume()
按后退键
MyFragment onPause()
MainActivity onPause()
MyFragment onStop()
MainActivity onStop()
MyFragment onDestoryView() 销毁掉自己的视图
MyFragment onDestory()
MyFragment onDetach() 解除和activity的关系
MainActivity onDetory()
2.一个简单的两个Fragmet联系的示例，点击其中一个另一个发生变化：
1)新建MyFragment继承自ListFragment:
public class MyFragment extends ListFragment { @Override public void onActivityCreated(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onActivityCreated(savedInstanceState); setListAdapter(new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_activated_1, android.R.id.text1, new String[]{"6:00","6:30","7:20","8:00","8:40"})); } @Override public void onListItemClick(ListView l, View v, int position, long id) { // TODO Auto-generated method stub super.onListItemClick(l, v, position, id); //设置为单选模式，单击选中 getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE); getListView().setItemChecked(position, true); FragmentManager fm = getFragmentManager(); FragmentTransaction ft = fm.beginTransaction(); Fragment fr = new TmpFragment(position); ft.replace(R.id.frame, fr); ft.commit(); }}
2)新建TmpFragment继承自Fragment:
1 public class TmpFragment extends Fragment { 2 3 private int index; 4 5 private static String[] items = new String[]{"起床洗漱","打拳散步","吃早饭","等公交","打卡"}; 6 7 public TmpFragment(int index) { 8 9 super();10 11 this.index = index;12 13 }14 15 @Override16 17 public View onCreateView(LayoutInflater inflater, ViewGroup container,18 19 Bundle savedInstanceState) {20 21 // TODO Auto-generated method stub22 23 TextView tv = new TextView(getActivity());24 25 tv.setText(items[index]);26 27 return tv;28 29 }30 31 }
3)布局文件：
1 <fragment 2 3 android:id="@+id/frag" 4 5 android:name="cn.csc.fragment1.MyFragment" 6 7 android:layout_width="0dp" 8 9 android:layout_height="match_parent"10 11 android:layout_weight="1"12 13 />14 15 <FrameLayout16 17 android:id="@+id/frame"18 19 android:layout_width="0dp"20 21 android:layout_height="wrap_content"22 23 android:layout_weight="1">24 25 </FrameLayout>
4)运行结果：
以上就是Fragment的简单学习，需要时再认真学下……