以下內容為原創，轉載請注明：

來自天天博客：http://www.cnblogs.com/tiantianbyconan/p/3709957.html

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之前寫過一篇博客，是使用Fragment來實現TabHost的效果，并且模擬TabHost的切換各個fragment生命周期的調用，見http://www.cnblogs.com/tiantianbyconan/p/3360938.html

但是如果要實現的效果是兩級的Tab，比如在第一級tab中又有三個子Tab切換不同的布局，

相當于在Fragment中嵌套來Fragment，這個怎么實現？

也有個官方的實現方法，通過使用android-support-v13.jar包中的getChildFragmentManager方法來獲取一個Manager。

這里帶來我寫的一個新的方案，使用SubLayout來實現。

相關源碼：https://github.com/wangjiegulu/AndroidBucket/tree/master/src/com/wangjie/androidbucket/customviews/sublayout

下面使用一個例子來說下使用方法，先看下最后的效果（項目使用了我的開源AndroidBucket和AndroidInject?請先添加依賴項目，歡迎star／fork）：

效果跟以前的例子大同小異，點擊第一個tab上的TextView，然后Toast提示EditText上的信息，但是使用方式卻是不一樣的。

大體的思路是在MainActivity布局中增加一個FrameLayout，然后在切換過程中不停的用相應的布局去替換FrameLayout中。

main.xml布局如下：

1 <?xml version="1.0" encoding="utf-8"?> 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 3 android:orientation="vertical" 4 android:layout_width="fill_parent" 5 android:layout_height="fill_parent" 6 > 7 8 <FrameLayout 9 android:id="@+id/main_content_view" 10 android:layout_width="match_parent" 11 android:layout_height="0dp" 12 android:layout_weight="1.0" 13 /> 14 15 <RadioGroup 16 android:id="@+id/main_tabs_rg" 17 android:layout_width="fill_parent" 18 android:layout_height="65dp" 19 android:background="#aabbcc" 20 android:gravity="center_vertical" 21 android:orientation="horizontal" > 22 23 <RadioButton 24 android:id="@+id/main_tab_a_rb" 25 style="@style/tab_item_background" 26 android:drawableTop="@drawable/ic_launcher" 27 android:paddingTop="7dp" 28 android:textSize="13sp" 29 android:checked="true" 30 /> 31 32 <RadioButton 33 android:id="@+id/main_tab_b_rb" 34 style="@style/tab_item_background" 35 android:drawableTop="@drawable/ic_launcher" 36 android:paddingTop="7dp" 37 android:textSize="13sp" 38 /> 39 40 <RadioButton 41 android:id="@+id/main_tab_c_rb" 42 style="@style/tab_item_background" 43 android:drawableTop="@drawable/ic_launcher" 44 android:paddingTop="7dp" 45 android:textSize="13sp" 46 /> 47 48 </RadioGroup> 49 50 </LinearLayout>

布局很簡單，一個FrameLayout用于存放不同界面的布局，3個RadioButton表示下面的每一項Tab按鈕。

在MainActivity中代碼如下：

@AILayout(R.layout.main) public class MainActivity extends AIActivity {public static final String TAG = MainActivity.class.getSimpleName();@AIView(R.id.main_content_view)ViewGroup contentView;@AIView(R.id.main_tabs_rg)RadioGroup rg;SubLayoutManager sbManager;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);sbManager = new SubLayoutManager<SubLayout>(context, contentView, TabASubLayout.class, TabBSubLayout.class, TabCSubLayout.class);sbManager.setSwitchListener(new SubLayoutManager.LayoutSwitchListener<SubLayout>() {@Overridepublic void switchSelf(SubLayout subLayout, int position) {Logger.d(TAG, "[switch listener]switchSelf, subLayout: " + subLayout + ", position: " + position);}@Overridepublic void switchCompleted(SubLayout subLayout, int position) {Logger.d(TAG, "[switch listener]switchCompleted, subLayout: " + subLayout + ", position: " + position);}});rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {@Overridepublic void onCheckedChanged(RadioGroup radioGroup, int i) {int index = -1;switch(i){case R.id.main_tab_a_rb:index = 0;break;case R.id.main_tab_b_rb:index = 1;break;case R.id.main_tab_c_rb:index = 2;break;}if(index < 0 || index >= sbManager.getSubLayoutSize()){return;}sbManager.switchLayout(index);}});sbManager.switchLayout(0); // 默認切換第一頁 }@Overrideprotected void onDestroy() {super.onDestroy();sbManager.destoryClear();sbManager = null;}}

上面的SubLayout相當于一個Fragment，SubLayoutManager用于管理多個SubLayout之間的切換。SubLayoutManager可以通過new獲取。

其中構造方法中：

public SubLayoutManager(Context context, ViewGroup contentView, Class<? extends T>... slszzs) {

參數二：contentView表示在MainActivity中預留給SubLayout顯示的FrameLayout。

參數三：是個可變長參數，可以在后面（有序）追加所有需要切換的SubLayout的Class對象。

第一次初始化后各個SubLayout對象不會馬上生成，只會在切換到改頁面時才會生成該對象，會執行SubLayout的initLayout()方法，這個方法只會調用一次（類似onCreate()方法）

需要切換頁面時只需要執行SubLayoutManager的switchLayout()方法，傳入SubLayout的position就可以了，這個position跟參數三的順序一致。

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接下來看下幾個SubLayout是怎么去實現的，因為三個SubLayout大致相同，所以只分析一個就可以了：

TabASubLayout代碼如下：

1 @AILayout(R.layout.tab_a) 2 public class TabASubLayout extends AISubLayout { 3 public static final String TAG = TabASubLayout.class.getSimpleName(); 4 5 6 // @AIView(R.id.tab_a_tv) 7 // TextView tv; 8 @AIView(R.id.tab_a_et) 9 EditText et; 10 11 public TabASubLayout(Context context) { 12 super(context); 13 // setContentView(R.layout.tab_a); 14 15 } 16 17 @Override 18 public void initLayout() { 19 super.initLayout(); 20 Logger.d(TAG, "initLayout..."); 21 } 22 23 @AIClick({R.id.tab_a_tv}) 24 public void onClickCallbackSample(View view) { 25 Toast.makeText(context, "clicked: " + ((TextView)view).getText() + ", " + et.getText(), Toast.LENGTH_SHORT).show(); 26 } 27 28 @Override 29 public void onResume() { 30 super.onResume(); 31 Logger.d(TAG, "onResume..."); 32 } 33 34 @Override 35 public void onPause() { 36 super.onPause(); 37 Logger.d(TAG, "onPause..."); 38 } 39 40 }

代碼很簡單，繼承AISubLayout即可，AISubLayout是AndroidInject中AndroidBucket的子類，實現了SubLayout的注解的支持。當然你也可以直接繼承SubLayout，這樣的話就不能使用注解了，看上面的被注釋的代碼，可以通過setContentView來設置對應的布局，可以通過findViewById來獲取控件對象。

它也有onResume和onPause方法，當前頁A被切換到B的話會調用A的onPause，然后調用B的onResume（如果之前B沒有被初始化過，則先調用initLayout再調用onResume方法）

下面來看看log打印的日志：

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// 以下為啟動應用，默認加載TabA

05-05 08:22:32.216 1086-1086/com.wangjie.sublayouttest D/SubLayoutManager﹕ -----switch start-----------------------
05-05 08:22:32.216 1086-1086/com.wangjie.sublayouttest D/SubLayoutManager﹕ switch before.........: [DelayObj{clazz=class com.wangjie.sublayouttest.TabASubLayout, delayObj=null}, DelayObj{clazz=class com.wangjie.sublayouttest.TabBSubLayout, delayObj=null}, DelayObj{clazz=class com.wangjie.sublayouttest.TabCSubLayout, delayObj=null}]
05-05 08:22:32.336 1086-1086/com.wangjie.sublayouttest D/TabASubLayout﹕ initLayout...
05-05 08:22:32.336 1086-1086/com.wangjie.sublayouttest D/TabASubLayout﹕ onResume...
05-05 08:22:32.336 1086-1086/com.wangjie.sublayouttest D/MainActivity﹕ [switch listener]switchCompleted, subLayout: com.wangjie.sublayouttest.TabASubLayout@b4dff088, position: 0
05-05 08:22:32.336 1086-1086/com.wangjie.sublayouttest D/SubLayoutManager﹕ switch after.........: [DelayObj{clazz=class com.wangjie.sublayouttest.TabASubLayout, delayObj=com.wangjie.sublayouttest.TabASubLayout@b4dff088}, DelayObj{clazz=class com.wangjie.sublayouttest.TabBSubLayout, delayObj=null}, DelayObj{clazz=class com.wangjie.sublayouttest.TabCSubLayout, delayObj=null}]
05-05 08:22:32.336 1086-1086/com.wangjie.sublayouttest D/SubLayoutManager﹕ -----switch end-----------------------

// TabA切換到TabB
05-05 08:22:37.926 1086-1086/com.wangjie.sublayouttest D/SubLayoutManager﹕ -----switch start-----------------------
05-05 08:22:37.926 1086-1086/com.wangjie.sublayouttest D/SubLayoutManager﹕ switch before.........: [DelayObj{clazz=class com.wangjie.sublayouttest.TabASubLayout, delayObj=com.wangjie.sublayouttest.TabASubLayout@b4dff088}, DelayObj{clazz=class com.wangjie.sublayouttest.TabBSubLayout, delayObj=null}, DelayObj{clazz=class com.wangjie.sublayouttest.TabCSubLayout, delayObj=null}]
05-05 08:22:37.946 1086-1086/com.wangjie.sublayouttest D/TabASubLayout﹕ onPause...
05-05 08:22:37.986 1086-1086/com.wangjie.sublayouttest D/TabBSubLayout﹕ initLayout...
05-05 08:22:37.996 1086-1086/com.wangjie.sublayouttest D/TabBSubLayout﹕ onResume...
05-05 08:22:37.996 1086-1086/com.wangjie.sublayouttest D/MainActivity﹕ [switch listener]switchCompleted, subLayout: com.wangjie.sublayouttest.TabBSubLayout@b4de1d80, position: 1
05-05 08:22:37.996 1086-1086/com.wangjie.sublayouttest D/SubLayoutManager﹕ switch after.........: [DelayObj{clazz=class com.wangjie.sublayouttest.TabASubLayout, delayObj=com.wangjie.sublayouttest.TabASubLayout@b4dff088}, DelayObj{clazz=class com.wangjie.sublayouttest.TabBSubLayout, delayObj=com.wangjie.sublayouttest.TabBSubLayout@b4de1d80}, DelayObj{clazz=class com.wangjie.sublayouttest.TabCSubLayout, delayObj=null}]
05-05 08:22:37.996 1086-1086/com.wangjie.sublayouttest D/SubLayoutManager﹕ -----switch end-----------------------

// TabB切換到TabC
05-05 08:22:41.486 1086-1086/com.wangjie.sublayouttest D/SubLayoutManager﹕ -----switch start-----------------------
05-05 08:22:41.486 1086-1086/com.wangjie.sublayouttest D/SubLayoutManager﹕ switch before.........: [DelayObj{clazz=class com.wangjie.sublayouttest.TabASubLayout, delayObj=com.wangjie.sublayouttest.TabASubLayout@b4dff088}, DelayObj{clazz=class com.wangjie.sublayouttest.TabBSubLayout, delayObj=com.wangjie.sublayouttest.TabBSubLayout@b4de1d80}, DelayObj{clazz=class com.wangjie.sublayouttest.TabCSubLayout, delayObj=null}]
05-05 08:22:41.496 1086-1086/com.wangjie.sublayouttest D/TabBSubLayout﹕ onPause...
05-05 08:22:41.516 1086-1086/com.wangjie.sublayouttest D/TabCSubLayout﹕ initLayout...
05-05 08:22:41.516 1086-1086/com.wangjie.sublayouttest D/TabCSubLayout﹕ onResume...
05-05 08:22:41.516 1086-1086/com.wangjie.sublayouttest D/MainActivity﹕ [switch listener]switchCompleted, subLayout: com.wangjie.sublayouttest.TabCSubLayout@b4e17840, position: 2
05-05 08:22:41.516 1086-1086/com.wangjie.sublayouttest D/SubLayoutManager﹕ switch after.........: [DelayObj{clazz=class com.wangjie.sublayouttest.TabASubLayout, delayObj=com.wangjie.sublayouttest.TabASubLayout@b4dff088}, DelayObj{clazz=class com.wangjie.sublayouttest.TabBSubLayout, delayObj=com.wangjie.sublayouttest.TabBSubLayout@b4de1d80}, DelayObj{clazz=class com.wangjie.sublayouttest.TabCSubLayout, delayObj=com.wangjie.sublayouttest.TabCSubLayout@b4e17840}]
05-05 08:22:41.526 1086-1086/com.wangjie.sublayouttest D/SubLayoutManager﹕ -----switch end-----------------------

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// TabC切換到TabA
05-05 08:22:44.086 1086-1086/com.wangjie.sublayouttest D/SubLayoutManager﹕ -----switch start-----------------------
05-05 08:22:44.086 1086-1086/com.wangjie.sublayouttest D/SubLayoutManager﹕ switch before.........: [DelayObj{clazz=class com.wangjie.sublayouttest.TabASubLayout, delayObj=com.wangjie.sublayouttest.TabASubLayout@b4dff088}, DelayObj{clazz=class com.wangjie.sublayouttest.TabBSubLayout, delayObj=com.wangjie.sublayouttest.TabBSubLayout@b4de1d80}, DelayObj{clazz=class com.wangjie.sublayouttest.TabCSubLayout, delayObj=com.wangjie.sublayouttest.TabCSubLayout@b4e17840}]
05-05 08:22:44.086 1086-1086/com.wangjie.sublayouttest D/TabCSubLayout﹕ onPause...
05-05 08:22:44.136 1086-1086/com.wangjie.sublayouttest D/TabASubLayout﹕ onResume...
05-05 08:22:44.136 1086-1086/com.wangjie.sublayouttest D/MainActivity﹕ [switch listener]switchCompleted, subLayout: com.wangjie.sublayouttest.TabASubLayout@b4dff088, position: 0
05-05 08:22:44.136 1086-1086/com.wangjie.sublayouttest D/SubLayoutManager﹕ switch after.........: [DelayObj{clazz=class com.wangjie.sublayouttest.TabASubLayout, delayObj=com.wangjie.sublayouttest.TabASubLayout@b4dff088}, DelayObj{clazz=class com.wangjie.sublayouttest.TabBSubLayout, delayObj=com.wangjie.sublayouttest.TabBSubLayout@b4de1d80}, DelayObj{clazz=class com.wangjie.sublayouttest.TabCSubLayout, delayObj=com.wangjie.sublayouttest.TabCSubLayout@b4e17840}]
05-05 08:22:44.136 1086-1086/com.wangjie.sublayouttest D/SubLayoutManager﹕ -----switch end-----------------------

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轉載于:https://www.cnblogs.com/tiantianbyconan/p/3709957.html

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