android TabHost小结

TabHost是整个Tab的容器，包括两部分，TabWidget和FrameLayout。TabWidget就是每个tab的标签，FrameLayout则是tab内容。

1、如果我们使用extends TabAcitivty，如同ListActivity，TabHost必须设置为@android:id/tabhost
2、TabWidget必须设置android:id为@android:id/tabs
3、FrameLayout需要设置android:id为@android:id/tabcontent
4、参考这儿：aspx">http://blog.csdn.net/flowingflying/archive/2011/04/06/6304289.aspx

先自定义一个xml文件：
Java代码 
<?xml version="1.0" encoding="utf-8"?> 
<TabHost xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@android:id/tabhost" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"> 
    <LinearLayout 
        android:orientation="vertical" 
        android:layout_width="fill_parent" 
        android:layout_height="fill_parent"> 
    <FrameLayout 
        android:id="@android:id/tabcontent" 
        android:layout_width="fill_parent" 
        android:layout_height="fill_parent" 
         android:layout_weight="1.0" 
        android:paddingBottom="53px"/> 
    <TabWidget 
        android:id="@android:id/tabs" 
        android:layout_alignParentBottom="true" 
        android:layout_width="fill_parent" 
        android:layout_height="50px"  
        android:visibility="gone" 
        android:layout_weight="0.0"/> 
        <RadioGroup 
            android:gravity="center_vertical" 
            android:orientation="horizontal" 
            android:id="@+id/main_radio" 
            android:background="@drawable/radiogroup_background" 
            android:layout_width="fill_parent" 
            android:layout_height="50dip" 
            android:layout_gravity="bottom"> 
            <RadioButton 
                android:id="@+id/main_index_button" 
                android:layout_marginTop="1.0dip" 
                android:layout_marginRight="5dip" 
                android:text="@string/main_name" 
                android:drawableTop="@drawable/unistall" 
                style="@style/main_tab_bottom" 
                android:background="@drawable/radio_bg"/> 
            <RadioButton 
                android:id="@+id/main_running_button" 
                android:layout_marginTop="1.0dip" 
                android:layout_marginRight="5dip" 
                android:text="@string/run_manager_name" 
                android:drawableTop="@drawable/unistall" 
                style="@style/main_tab_bottom" 
                android:background="@drawable/radio_bg"/> 
            <RadioButton 
                android:id="@+id/main_uninstall_button" 
                android:layout_marginTop="1.0dip" 
                android:text="@string/uninstall_manager_name" 
                android:drawableTop="@drawable/unistall" 
                style="@style/main_tab_bottom" 
                android:background="@drawable/radio_bg"/> 
        </RadioGroup> 
    </LinearLayout> 
</TabHost> 

为了让tabHost显示在下方，要将RadioGroup的layout_gravity设置为bottom，再将FrameLayout的layout_weight设置为1，这样就可以将RadioGroup撑到最下方。style="@style/main_tab_bottom"里面定义了样式文件。

接下来就是在activity中初始化并添加tabhost：
Java代码 
tabHost = (TabHost) findViewById(android.R.id.tabhost); 
        tabHost.addTab(Constant.tabHost.newTabSpec("Main") 
                .setIndicator(getString(R.string.main_name),null) 
                .setContent(new Intent(this, Main.class))); 
        tabHost.addTab(Constant.tabHost.newTabSpec("RunManager") 
                .setIndicator(getString(R.string.run_manager_name),null) 
                .setContent(new Intent(this, RunManager.class))); 
        tabHost.addTab(Constant.tabHost.newTabSpec("UninstallManager") 
                .setIndicator(getString(R.string.uninstall_manager_name),null) 
                .setContent(new Intent(this, UninstallManager.class))); 

初始化每个RadioButton并为其添加setOnCheck