<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="40dp"
    android:orientation="horizontal" >

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="37dp"
        android:layout_weight="1"
        android:gravity="center"
        android:orientation="vertical" >

        <TextView
            android:id="@+id/main"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/weixin" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="37dp"
        android:layout_weight="1"
        android:gravity="center"
        android:orientation="vertical" >

        <TextView
            android:id="@+id/find"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/find" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="37dp"
        android:layout_weight="1"
        android:gravity="center"
        android:orientation="vertical" >

        <TextView
            android:id="@+id/mine"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/mine" />
    </LinearLayout>

</LinearLayout>

引用头部：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.itfanr.weixinlearn.MainActivity" >

    <include 
        layout="@layout/top1"/>
    <include 
        layout = "@layout/top2"
        />   

</LinearLayout>

效果图：

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