LinearLayout中TextView基准线问题

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal" >

<TextView
android:layout_width="0dp"
android:layout_height="48dp"
android:layout_weight="1"
android:background="#44ff0000"
android:gravity="center"
android:text="1111111111111111111" />

<TextView
android:layout_width="0dp"
android:layout_height="48dp"
android:layout_weight="2"
android:background="#4400ff00"
android:gravity="center"
android:text="2" />

<TextView
android:layout_width="0dp"
android:layout_height="48dp"
android:layout_weight="3"
android:background="#440000ff"
android:gravity="center"
android:text="3" />

</LinearLayout>