[Android]AndroidBucket增加碎片SubLayout功能及AISubLayout的注解支持

以下内容为原创，转载请注明：

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

之前写过一篇博客，是使用Fragment来实现TabHost的效果，并且模拟TabHost的切换各个fragment生命周期的调用，见http://www.cnblogs.com/tiantianbyconan/p/3360938.html

但是如果要实现的效果是两级的Tab，比如在第一级tab中又有三个子Tab切换不同的布局，

相当于在Fragment中嵌套来Fragment，这个怎么实现？

也有个官方的实现方法，通过使用android-support-v13.jar包中的getChildFragmentManager方法来获取一个Manager。

这里带来我写的一个新的方案，使用SubLayout来实现。

相关源码：https://github.com/wangjiegulu/AndroidBucket/tree/master/src/com/wangjie/androidbucket/customviews/sublayout

下面使用一个例子来说下使用方法，先看下最后的效果（项目使用了我的开源AndroidBucket和AndroidInject请先添加依赖项目，欢迎star／fork）：

效果跟以前的例子大同小异，点击第一个tab上的TextView，然后Toast提示EditText上的信息，但是使用方式却是不一样的。

大体的思路是在MainActivity布局中增加一个FrameLayout，然后在切换过程中不停的用相应的布局去替换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     <RadioGroup16             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         <RadioButton24                 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         <RadioButton33                 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         <RadioButton41                 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>

布局很简单，一个FrameLayout用于存放不同界面的布局，3个RadioButton表示下面的每一项Tab按钮。

在MainActivity中代码如下：

@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;    @Override    public 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>() {            @Override            public void switchSelf(SubLayout subLayout, int position) {                Logger.d(TAG, "[switch listener]switchSelf, subLayout: " + subLayout + ", position: " + position);            }            @Override            public void switchCompleted(SubLayout subLayout, int position) {                Logger.d(TAG, "[switch listener]switchCompleted, subLayout: " + subLayout + ", position: " + position);            }        });        rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {            @Override            public 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); // 默认切换第一页    }    @Override    protected void onDestroy() {        super.onDestroy();        sbManager.destoryClear();        sbManager = null;    }}

上面的SubLayout相当于一个Fragment，SubLayoutManager用于管理多个SubLayout之间的切换。SubLayoutManager可以通过new获取。

其中构造方法中：

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

参数二：contentView表示在MainActivity中预留给SubLayout显示的FrameLayout。

参数三：是个可变长参数，可以在后面（有序）追加所有需要切换的SubLayout的Class对象。

第一次初始化后各个SubLayout对象不会马上生成，只会在切换到改页面时才会生成该对象，会执行SubLayout的initLayout()方法，这个方法只会调用一次（类似onCreate()方法）

需要切换页面时只需要执行SubLayoutManager的switchLayout()方法，传入SubLayout的position就可以了，这个position跟参数三的顺序一致。

接下来看下几个SubLayout是怎么去实现的，因为三个SubLayout大致相同，所以只分析一个就可以了：

TabASubLayout代码如下：

 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     @Override18     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     @Override29     public void onResume() {30         super.onResume();31         Logger.d(TAG, "onResume...");32     }33 34     @Override35     public void onPause() {36         super.onPause();37         Logger.d(TAG, "onPause...");38     }39 40 }

代码很简单，继承AISubLayout即可，AISubLayout是AndroidInject中AndroidBucket的子类，实现了SubLayout的注解的支持。当然你也可以直接继承SubLayout，这样的话就不能使用注解了，看上面的被注释的代码，可以通过setContentView来设置对应的布局，可以通过findViewById来获取控件对象。

它也有onResume和onPause方法，当前页A被切换到B的话会调用A的onPause，然后调用B的onResume（如果之前B没有被初始化过，则先调用initLayout再调用onResume方法）

下面来看看log打印的日志：

// 以下为启动应用，默认加载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切换到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切换到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-----------------------

// TabC切换到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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