android-仿QQtab

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout  
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/root" 
    android:layout_width="fill_parent"  
    android:layout_height="fill_parent"  
    > 
    <LinearLayout  
        android:orientation="vertical" 
        android:layout_width="fill_parent"  
        android:layout_height="fill_parent"  
        android:background="@drawable/default_bg" 
        > 
        <LinearLayout  
            android:orientation="horizontal" 
            android:layout_width="fill_parent"  
            android:layout_height="fill_parent"  
            android:layout_weight="6.0" 
            > 
            <RelativeLayout  
                android:id="@+id/layout1" 
                android:layout_width="fill_parent"  
                android:layout_height="wrap_content"  
                android:layout_weight="1.0" 
                android:layout_gravity="center_vertical" 
                > 
                <ImageView 
                    android:id="@+id/tab1" 
                    android:layout_width="wrap_content"