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Fragment(四)Fragment生命周期分析(转)

Fragment(四)Fragment生命周期分析

转载请注明:http://blog.csdn.net/liaoqianchuan00/article/details/24271607

 

例子一 从Layout中加载Fragment:

 

假设我们有一个Activity的Layout中有两个Fragment:

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

   xmlns:tools="http://schemas.android.com/tools"

   android:id="@+id/container"

   android:layout_width="match_parent"

   android:layout_height="match_parent"

   tools:context="com.example.androidtest.MainActivity"

   android:orientation="horizontal"

   tools:ignore="MergeRootFrame" >

 

   <fragmentandroid:name="com.example.androidtest.FragmentA"

           android:id="@+id/fragmentA"

           android:layout_weight="1"

           android:layout_width="match_parent"

           android:layout_height="match_parent" />

   <fragment android:name="com.example.androidtest.FragmentB"

            android:id="@+id/fragmentB"

           android:layout_weight="1"

           android:layout_width="match_parent"

           android:layout_height="match_parent" />

   

 

</LinearLayout>

 

而我们的Fragment很简单:

public class MainActivity extends FragmentActivity {

       @Override

       protectedvoid onCreate(Bundle savedInstanceState) {

              super.onCreate(savedInstanceState);

              Log.d("==========","MainActivity onCreate");

             

              setContentView(R.layout.activity_main);

              Log.d("==========","MainActivity onCreate finish");

       }

 

 

      

       @Override

       protectedvoid onDestroy() {

              Log.d("==========","MainActivity onDestroy");

              super.onDestroy();

              Log.d("==========","MainActivity onDestroy finish");

             

       }

 

       @Override

       protectedvoid onPause() {

              Log.d("==========","MainActivity onPause");

              super.onPause();

              Log.d("==========","MainActivity onPause finish");

             

       }

 

       @Override

       protectedvoid onResume() {

              Log.d("==========","MainActivity onResume");

              super.onResume();

              Log.d("==========","MainActivity onResume finish");

             

       }

 

       @Override

       protectedvoid onStart() {

              Log.d("==========","MainActivity onStart");

              super.onStart();

              Log.d("==========","MainActivity onStart finish");

             

       }

 

       @Override

       protectedvoid onStop() {

              Log.d("==========","MainActivity onStop");

              super.onStop();

              Log.d("==========","MainActivity onStop finish");

       }

 

}

 

接下来是我们的FragmentA:

public class FragmentA extends Fragment {

 

       @Override

       publicvoid onAttach(Activity activity) {

              super.onAttach(activity);   

              Log.d("==========","FragmentA onAttach");

       }

 

       @Override

       publicvoid onActivityCreated(Bundle savedInstanceState) {

              super.onActivityCreated(savedInstanceState);

              Log.d("==========","FragmentA onActivityCreated");

       }

 

       @Override

       publicvoid onCreate(Bundle savedInstanceState) {

              super.onCreate(savedInstanceState);

              Log.d("==========","FragmentA onCreate");

       }

 

       @Override

       publicView onCreateView(LayoutInflater inflater, ViewGroup container,

                     BundlesavedInstanceState) {

              Log.d("==========","FragmentA onCreateView");

              returninflater.inflate(R.layout.fragment_main, container, false);

       }

 

       @Override

       publicvoid onDestroy() {

              super.onDestroy();

              Log.d("==========","FragmentA onDestroy");

       }

 

       @Override

       publicvoid onDestroyView() {

              super.onDestroyView();

              Log.d("==========","FragmentA onDestroyView");

       }

 

       @Override

       publicvoid onDetach() {

              super.onDetach();

              Log.d("==========","FragmentA onDetach");

       }

 

       @Override

       publicvoid onPause() {

              super.onPause();

              Log.d("==========","FragmentA onPause");

       }

 

       @Override

       publicvoid onResume() {

              super.onResume();

              Log.d("==========","FragmentA onResume");

       }

 

       @Override

       publicvoid onStart() {

              super.onStart();

              Log.d("==========","FragmentA onStart");

       }

 

       @Override

       publicvoid onStop() {

              super.onStop();

              Log.d("==========","FragmentA onStop");

       }

      

      

}

 

Fragment B和A类似,只是log不同。

 

开始测试。运行程序,当出现界面之后,关闭屏幕电源,然后再点亮屏幕,出现屏幕之后再旋转屏幕,最后按back退出程序。

 

查看Log:

======运行程序

04-21 16:54:05.689: D/==========(31589):MainActivity onCreate

04-21 16:54:05.699: D/==========(31589):FragmentA onAttach

04-21 16:54:05.699: D/==========(31589):FragmentA onCreate

04-21 16:54:05.709: D/==========(31589):FragmentA onCreateView

04-21 16:54:05.709: D/==========(31589):FragmentB onAttach

04-21 16:54:05.709: D/==========(31589):FragmentB onCreate

04-21 16:54:05.709: D/==========(31589):FragmentB onCreateView

04-21 16:54:05.709: D/==========(31589):MainActivity onCreate finish

04-21 16:54:05.709: D/==========(31589):MainActivity onStart

04-21 16:54:05.709: D/==========(31589):FragmentA onActivityCreated

04-21 16:54:05.709: D/==========(31589):FragmentB onActivityCreated

04-21 16:54:05.709: D/==========(31589):FragmentA onStart

04-21 16:54:05.709: D/==========(31589):FragmentB onStart

04-21 16:54:05.709: D/==========(31589):MainActivity onStart finish

04-21 16:54:05.709: D/==========(31589):MainActivity onResume

04-21 16:54:05.709: D/==========(31589):MainActivity onResume finish

04-21 16:54:05.709: D/==========(31589):FragmentA onResume

04-21 16:54:05.709: D/==========(31589):FragmentB onResume

======关闭屏幕

04-21 16:54:09.929: D/==========(31589):MainActivity onPause

04-21 16:54:09.989: D/==========(31589):FragmentA onPause

04-21 16:54:09.989: D/==========(31589):FragmentB onPause

04-21 16:54:09.989: D/==========(31589):MainActivity onPause finish

04-21 16:54:09.999: D/==========(31589):MainActivity onStop

04-21 16:54:09.999: D/==========(31589):FragmentA onStop

04-21 16:54:09.999: D/==========(31589):FragmentB onStop

04-21 16:54:09.999: D/==========(31589):MainActivity onStop finish

======再次点亮屏幕

04-21 16:54:22.099: D/==========(31589):MainActivity onStart

04-21 16:54:22.099: D/==========(31589):FragmentA onStart

04-21 16:54:22.099: D/==========(31589):FragmentB onStart

04-21 16:54:22.099: D/==========(31589):MainActivity onStart finish

04-21 16:54:22.109: D/==========(31589):MainActivity onResume

04-21 16:54:22.109: D/==========(31589):MainActivity onResume finish

04-21 16:54:22.109: D/==========(31589):FragmentA onResume

04-21 16:54:22.109: D/==========(31589):FragmentB onResume

======旋转屏幕(导致重新创建ActivityFragment

04-21 16:54:26.729: D/==========(31589):MainActivity onPause

04-21 16:54:26.729: D/==========(31589):FragmentA onPause

04-21 16:54:26.729: D/==========(31589):FragmentB onPause

04-21 16:54:26.729: D/==========(31589):MainActivity onPause finish

04-21 16:54:26.729: D/==========(31589):MainActivity onStop

04-21 16:54:26.729: D/==========(31589):FragmentA onStop

04-21 16:54:26.729: D/==========(31589):FragmentB onStop

04-21 16:54:26.729: D/==========(31589):MainActivity onStop finish

04-21 16:54:26.729: D/==========(31589):MainActivity onDestroy

04-21 16:54:26.729: D/==========(31589):FragmentA onDestroyView

04-21 16:54:26.729: D/==========(31589):FragmentA onDestroy

04-21 16:54:26.729: D/==========(31589):FragmentA onDetach

04-21 16:54:26.729: D/==========(31589):FragmentB onDestroyView

04-21 16:54:26.729: D/==========(31589):FragmentB onDestroy

04-21 16:54:26.729: D/==========(31589):FragmentB onDetach

04-21 16:54:26.729: D/==========(31589):MainActivity onDestroy finish

04-21 16:54:26.739: D/==========(31589):MainActivity onCreate

04-21 16:54:26.749: D/==========(31589):FragmentA onAttach

04-21 16:54:26.749: D/==========(31589):FragmentA onCreate

04-21 16:54:26.749: D/==========(31589):FragmentA onCreateView

04-21 16:54:26.749: D/==========(31589):FragmentB onAttach

04-21 16:54:26.749: D/==========(31589):FragmentB onCreate

04-21 16:54:26.749: D/==========(31589):FragmentB onCreateView

04-21 16:54:26.749: D/==========(31589):MainActivity onCreate finish

04-21 16:54:26.749: D/==========(31589):MainActivity onStart

04-21 16:54:26.749: D/==========(31589):FragmentA onActivityCreated

04-21 16:54:26.749: D/==========(31589):FragmentB onActivityCreated

04-21 16:54:26.749: D/==========(31589):FragmentA onStart

04-21 16:54:26.749: D/==========(31589):FragmentB onStart

04-21 16:54:26.749: D/==========(31589):MainActivity onStart finish

04-21 16:54:26.749: D/==========(31589):MainActivity onResume

04-21 16:54:26.749: D/==========(31589):MainActivity onResume finish

04-21 16:54:26.749: D/==========(31589):FragmentA onResume

04-21 16:54:26.749: D/==========(31589):FragmentB onResume

04-21 16:54:26.759: E/ViewRootImpl(31589):sendUserActionEvent() mView == null

======Back退出程序

04-21 16:54:33.249: D/==========(31589):MainActivity onPause

04-21 16:54:33.249: D/==========(31589):FragmentA onPause

04-21 16:54:33.249: D/==========(31589):FragmentB onPause

04-21 16:54:33.249: D/==========(31589):MainActivity onPause finish

04-21 16:54:33.439:W/IInputConnectionWrapper(31589): showStatusIcon on inactive InputConnection

04-21 16:54:33.469: D/==========(31589):MainActivity onStop

04-21 16:54:33.469: D/==========(31589):FragmentA onStop

04-21 16:54:33.469: D/==========(31589):FragmentB onStop

04-21 16:54:33.469: D/==========(31589):MainActivity onStop finish

04-21 16:54:33.469: D/==========(31589):MainActivity onDestroy

04-21 16:54:33.469: D/==========(31589):FragmentA onDestroyView

04-21 16:54:33.469: D/==========(31589):FragmentA onDestroy

04-21 16:54:33.469: D/==========(31589):FragmentA onDetach

04-21 16:54:33.469: D/==========(31589):FragmentB onDestroyView

04-21 16:54:33.469: D/==========(31589):FragmentB onDestroy

04-21 16:54:33.469: D/==========(31589):FragmentB onDetach

04-21 16:54:33.469: D/==========(31589):MainActivity onDestroy finish

例子二 从代码中加载Fragment

接下来我们将上面的例子改一下,在点击Activity界面一个Button的时候添加两个Fragment。

我们将Activity的layout文件改成如下所示:

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

   xmlns:tools="http://schemas.android.com/tools"

   android:id="@+id/container"

   android:layout_width="match_parent"

   android:layout_height="match_parent"

   android:orientation="horizontal"

   tools:context="com.example.androidtest.MainActivity"

   tools:ignore="MergeRootFrame" >

 

    <Button

       android:id="@+id/btn"

       android:layout_width="wrap_content"

       android:layout_height="wrap_content" >

   </Button>

 

</LinearLayout>

 

将MainActivity的onCreate函数改成如下:

protected void onCreate(Bundle savedInstanceState) {

              super.onCreate(savedInstanceState);

              Log.d("==========","MainActivity onCreate");

             

              setContentView(R.layout.activity_main);

             

              Buttonbtn = (Button) findViewById(R.id.btn);

              btn.setOnClickListener(newOnClickListener() {

                    

                     @Override

                     publicvoid onClick(View arg0) {

                            Fragmenta = new FragmentA();

                            FragmentTransactionft = getSupportFragmentManager().beginTransaction();

                            ft.add(R.id.container,a);

                            ft.commit();

                     }

              });

              Log.d("==========","MainActivity onCreate finish");

       }

开始测试。运行程序,当出现界面之后,点击按钮,出现新的界面的之后,关闭屏幕电源,然后再点亮屏幕,出现屏幕之后再旋转屏幕,最后按back退出程序。

 

查看Log:

======运行程序

04-21 17:08:39.869: D/==========(2830):MainActivity onCreate

04-21 17:08:39.889: D/==========(2830):MainActivity onCreate finish

04-21 17:08:39.889: D/==========(2830):MainActivity onStart

04-21 17:08:39.889: D/==========(2830):MainActivity onStart finish

04-21 17:08:39.889: D/==========(2830):MainActivity onResume

04-21 17:08:39.889: D/==========(2830):MainActivity onResume finish

======点击按钮

04-21 17:08:46.039: D/==========(2830):FragmentA onAttach

04-21 17:08:46.039: D/==========(2830):FragmentA onCreate

04-21 17:08:46.039: D/==========(2830):FragmentA onCreateView

04-21 17:08:46.039: D/==========(2830): FragmentAonActivityCreated

04-21 17:08:46.039: D/==========(2830):FragmentA onStart

04-21 17:08:46.039: D/==========(2830):FragmentA onResume

======关闭屏幕

04-21 17:09:23.239: D/==========(2830):MainActivity onPause

04-21 17:09:23.329: D/==========(2830): FragmentAonPause

04-21 17:09:23.329: D/==========(2830):MainActivity onPause finish

04-21 17:09:23.429: D/==========(2830):MainActivity onStop

04-21 17:09:23.429: D/==========(2830):FragmentA onStop

04-21 17:09:23.429: D/==========(2830):MainActivity onStop finish

======再次点亮屏幕

04-21 17:09:46.779: D/==========(2830):MainActivity onStart

04-21 17:09:46.779: D/==========(2830):FragmentA onStart

04-21 17:09:46.779: D/==========(2830):MainActivity onStart finish

04-21 17:09:46.789: D/==========(2830): MainActivityonResume

04-21 17:09:46.789: D/==========(2830):MainActivity onResume finish

04-21 17:09:46.789: D/==========(2830):FragmentA onResume

======旋转屏幕

04-21 17:09:53.339: D/==========(2830):MainActivity onPause

04-21 17:09:53.339: D/==========(2830):FragmentA onPause

04-21 17:09:53.349: D/==========(2830):MainActivity onPause finish

04-21 17:09:53.349: D/==========(2830):MainActivity onStop

04-21 17:09:53.349: D/==========(2830):FragmentA onStop

04-21 17:09:53.349: D/==========(2830):MainActivity onStop finish

04-21 17:09:53.349: D/==========(2830):MainActivity onDestroy

04-21 17:09:53.349: D/==========(2830):FragmentA onDestroyView

04-21 17:09:53.349: D/==========(2830):FragmentA onDestroy

04-21 17:09:53.349: D/==========(2830):FragmentA onDetach

04-21 17:09:53.349: D/==========(2830):MainActivity onDestroy finish

04-21 17:09:53.359: D/==========(2830):FragmentA onAttach

04-21 17:09:53.359: D/==========(2830):FragmentA onCreate

04-21 17:09:53.359: D/==========(2830):MainActivity onCreate

04-21 17:09:53.379: D/==========(2830):MainActivity onCreate finish

04-21 17:09:53.379: D/==========(2830):MainActivity onStart

04-21 17:09:53.379: D/==========(2830):FragmentA onCreateView

04-21 17:09:53.379: D/==========(2830):FragmentA onActivityCreated

04-21 17:09:53.379: D/==========(2830):FragmentA onStart

04-21 17:09:53.379: D/==========(2830):MainActivity onStart finish

04-21 17:09:53.379: D/==========(2830):MainActivity onResume

04-21 17:09:53.379: D/==========(2830):MainActivity onResume finish

04-21 17:09:53.379: D/==========(2830):FragmentA onResume

04-21 17:09:53.399: E/ViewRootImpl(2830):sendUserActionEvent() mView == null

======back退出程序

04-21 17:10:14.069: D/==========(2830):MainActivity onPause

04-21 17:10:14.069: D/==========(2830):FragmentA onPause

04-21 17:10:14.079: D/==========(2830):MainActivity onPause finish

04-21 17:10:14.249:W/IInputConnectionWrapper(2830): showStatusIcon on inactive InputConnection

04-21 17:10:14.269: D/==========(2830):MainActivity onStop

04-21 17:10:14.269: D/==========(2830):FragmentA onStop

04-21 17:10:14.269: D/==========(2830):MainActivity onStop finish

04-21 17:10:14.269: D/==========(2830):MainActivity onDestroy

04-21 17:10:14.269: D/==========(2830):FragmentA onDestroyView

04-21 17:10:14.269: D/==========(2830):FragmentA onDestroy

04-21 17:10:14.269: D/==========(2830):FragmentA onDetach

04-21 17:10:14.269: D/==========(2830):MainActivity onDestroy finish

 

例子三 Hide Fragment之后的生命周期

我们在main activity中添加两个按钮,一个add fragment,一个hidefragment

 

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

   xmlns:tools="http://schemas.android.com/tools"

   android:id="@+id/container"

   android:layout_width="match_parent"

   android:layout_height="match_parent"

   android:orientation="horizontal"

   tools:context="com.example.androidtest.MainActivity"

   tools:ignore="MergeRootFrame" >

 

    <Button

       android:id="@+id/btn1"

       android:text="add Fragment"

       android:layout_width="wrap_content"

       android:layout_height="wrap_content" >

   </Button>

 

    <Button

       android:id="@+id/btn2"

        android:text="hide Fragment"

       android:layout_width="wrap_content"

       android:layout_height="wrap_content" >

   </Button>

   

</LinearLayout>

 

修改MainActivity的onCreate函数

@Override

       protectedvoid onCreate(Bundle savedInstanceState) {

              super.onCreate(savedInstanceState);

              Log.d("==========","MainActivity onCreate");

             

              setContentView(R.layout.activity_main);

             

              Buttonbtn1 = (Button) findViewById(R.id.btn1);

              btn1.setOnClickListener(newOnClickListener() {

                    

                     @Override

                     publicvoid onClick(View arg0) {

                            Log.d("==========","Add Fragment");

                            Fragmenta = new FragmentA();

                            FragmentTransactionft = getSupportFragmentManager().beginTransaction();

                            ft.add(R.id.container,a,"Fragment A");

                            ft.commit();

                     }

              });

              Buttonbtn2 = (Button) findViewById(R.id.btn2);

              btn2.setOnClickListener(newOnClickListener() {

                    

                     @Override

                     publicvoid onClick(View arg0) {

                            Log.d("==========","Hide Fragment");

                            FragmentTransactionft = getSupportFragmentManager().beginTransaction();

                            ft.hide(getSupportFragmentManager().findFragmentByTag("FragmentA"));

                            ft.commit();

                     }

              });

              Log.d("==========","MainActivity onCreate finish");

       }

 

 

开始测试。运行程序,当出现界面之后,点击add Fragment,出现新的界面的之后,再点击hide Fragment,然后关闭屏幕,接着点亮屏幕。

 

查看Log:

======运行程序

04-21 17:18:53.069: D/==========(3974):MainActivity onCreate

04-21 17:18:53.079: D/==========(3974):MainActivity onCreate finish

04-21 17:18:53.079: D/==========(3974):MainActivity onStart

04-21 17:18:53.079: D/==========(3974):MainActivity onStart finish

04-21 17:18:53.079: D/==========(3974):MainActivity onResume

04-21 17:18:53.079: D/==========(3974):MainActivity onResume finish

======点击add Fragment

04-21 17:18:55.729: D/==========(3974): AddFragment

04-21 17:18:55.729: D/==========(3974):FragmentA onAttach

04-21 17:18:55.729: D/==========(3974):FragmentA onCreate

04-21 17:18:55.729: D/==========(3974):FragmentA onCreateView

04-21 17:18:55.729: D/==========(3974):FragmentA onActivityCreated

04-21 17:18:55.729: D/==========(3974):FragmentA onStart

04-21 17:18:55.729: D/==========(3974):FragmentA onResume

======点击hide Fragment

04-21 17:19:03.409: D/==========(3974):Hide Fragment

======关闭屏幕

04-21 17:19:20.349: D/==========(3974):MainActivity onPause

04-21 17:19:20.369: D/==========(3974):FragmentA onPause

04-21 17:19:20.369: D/==========(3974):MainActivity onPause finish

04-21 17:19:20.379: D/==========(3974):MainActivity onStop

04-21 17:19:20.379: D/==========(3974):FragmentA onStop

04-21 17:19:20.379: D/==========(3974):MainActivity onStop finish

======点亮屏幕

04-21 17:19:35.079: D/==========(3974):MainActivity onStart

04-21 17:19:35.079: D/==========(3974):FragmentA onStart

04-21 17:19:35.079: D/==========(3974):MainActivity onStart finish

04-21 17:19:35.089: D/==========(3974):MainActivity onResume

04-21 17:19:35.089: D/==========(3974):MainActivity onResume finish

04-21 17:19:35.089: D/==========(3974):FragmentA onResume

我们发现虽然我们的Fragment被hide起来了,但是因为他没有被移除掉,所以他的生命周期还是会被宿主Activity影响。

Fragment(四)Fragment生命周期分析(转)