xml:error parsing xml unbound prefix

<LinearLayout
    android:layout_width="fill_parent"
android:layout_height="fill_parent"
    android:orientation="horizontal"
    android:layout_marginTop="380px"
    android:background="#1e72bb"
    anroid:gravity="center">

改为

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal"
    android:layout_marginTop="380px"
    android:background="#1e72bb"
    android:gravity="center">