<RadioGroup
        android:id="@+id/main_tab_RadioGroup"
       android:layout_width="match_parent"
      android:layout_height="wrap_content"
          android:layout_gravity="bottom"
          android:background="@drawable/toolbar_bkg"
          android:gravity="center_vertical"
        android:orientation="horizontal" >
  
        <RadioButton
             android:id="@+id/model1"
             style="@style/tab"
             android:checked="true"
             android:drawableTop="@drawable/model1"
             android:text="@string/model1"/>"
 
         <RadioButton
             android:id="@+id/model2"
             style="@style/tab"
             android:drawableTop="@drawable/model2"
             android:text="@string/model2" />
 
         <RadioButton
             android:id="@+id/model3"
             style="@style/tab"
             android:drawableTop="@drawable/model3"
             android:text="@string/model3" />
     </RadioGroup>
tab样式如下：

          <style name="tab">
          <item name="android:layout_width">match_parent</item>
          <item name="android:layout_height">match_parent</item>
          <item name="android:textSize">12dp</item>
          <item name="android:layout_weight">1.0</item>
         <item name="android:button">@null</item>
          <item name="android:layout_gravity">center_horizontal</item>
          <item name="android:gravity">center_horizontal</item>
          <item name="android:paddingTop">2dp</item>
         <item name="android:singleLine">true</item>
         <item name="android:textColor">@drawable/textcolor</item>
     </style>
model1的样式如下：

 <?xml version="1.0" encoding="utf-8"?>
 <selector xmlns:android="http://schemas.android.com/apk/res/android" >
     <item android:state_checked="false" android:drawable="@drawable/tab_color_highlight"/>
     <item android:state_checked="true" android:drawable="@drawable/tab_color_normal"/>
 </selector>