Android: 自定义Tab样式

1.制作4个9patch的tab样式，可参考android默认的资源

tab_unselected.9.png tab_selected.9.pngtab_press.9.pngtab_focus.9.png

这4个资源分别代表Tab的4种状态。

2.定义Tab的selector样式（就叫它tab_indicator.xml好了），将其放入drawable文件夹下，代码如下：

<?xml version="1.0" encoding="utf-8"?>  
<selector xmlns:android="http://schemas.android.com/apk/res/android">  
    <!-- Non focused states -->  
    <item android:state_focused="false" android:state_selected="false" android:state_pressed="false" android:drawable="@drawable/tab_unselected" />  
    <item android:state_focused="false" android:state_selected="true" android:state_pressed="false" android:drawable="@drawable/tab_selected" />  
    <!-- Focused states -->  
    <item android:state_focused="true" android:state_selected="false" android:state_pressed="false" android:drawable="@drawable/tab_focus" />  
    <item android:state_focused="true" android:state_selected="true" android:state_pressed="false" android:drawable="@drawable/tab_focus" />  
    <!-- Pressed -->  
    <item android:state_pressed="true" android:drawable="@drawable/tab_press" />  
</selector>  

3.编写indicator的布局文件（不妨也叫tab_indicator.xml），将其放入layout文件夹下，代码如下：

<?xml version="1.0" encoding="utf-8"?>  
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:layout_width="0dip"  
    android:layout_height="64dip"  
    android:layout_weight="1"  
    android:layout_marginLeft="-3dip"  
    android:layout_marginRight="-3dip"  
    android:orientation="vertical"  
    android:background="@drawable/tab_indicator">  
    <ImageView android:id="@+id/icon"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_centerHorizontal="true"  
    />  
    <TextView android:id="@+id/title"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_alignParentBottom="true"  
        android:layout_centerHorizontal="true"  
        style="?android:attr/tabWidgetStyle" mce_style="?android:attr/tabWidgetStyle"  
    />  

4.接下来就是在TabActivity中使用我们自己编写的Tab样式了：

// 首先获取TabWidget  
mTabHost = getTabHost();  
LinearLayout ll = (LinearLayout)mTabHost.getChildAt(0);  
TabWidget tw = (TabWidget)ll.getChildAt(0);  

然后用类似如下代码创建TabSpec，就大功告成了。

RelativeLayout tabIndicator1 = (RelativeLayout) LayoutInflater.from(this).inflate(R.layout.tab_indicator, tw, false);  
TextView tvTab1 = (TextView)tabIndicator1.getChildAt(1);  
tvTab1.setText("tab1");  
mTabHot = mTabHost.newTabSpec("TAB_1")  
        .setIndicator(tabIndicator1)  
        .setContent(contentIntent);