Correct Layout

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#ffffff"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="fill_parent"
        android:layout_height="0px"
        android:layout_weight="3"
        android:gravity="center_horizontal"
        android:text="@string/welcome_message"
        android:textSize="30sp" />

    <ImageView android:src="@drawable/logo"
            android:layout_width="fill_parent"
            android:gravity="center_horizontal"
            android:layout_height="wrap_content"
            android:layout_weight="3"
            />

    <View
        android:layout_width="fill_parent"
        android:layout_height="0sp"
        android:layout_weight="1" />

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="0sp"
        android:layout_weight="2"
        android:orientation="horizontal" >

        <View
        android:layout_width="0sp"
        android:layout_height="fill_parent"
        android:layout_weight="1" />

        <TextView
            android:layout_width="0sp"
            android:layout_height="match_parent"
            android:text="User Name"
            android:textSize="22sp"
            android:layout_weight="1" />

        <EditText
            android:layout_width="0sp"
            android:layout_weight="1"
            android:layout_height="wrap_content" />

        <View
        android:layout_width="0sp"
        android:layout_height="fill_parent"
        android:layout_weight="1" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="0sp"
        android:layout_weight="2"
        android:orientation="horizontal" >

        <View
        android:layout_width="0sp"
        android:layout_height="fill_parent"
        android:layout_weight="1" />

        <TextView
            android:layout_width="0sp"
            android:layout_height="match_parent"
            android:text="Password"
            android:textSize="22sp"
            android:layout_weight="1" />

        <EditText
            android:layout_width="0sp"
            android:layout_weight="1"
            android:layout_height="wrap_content"
            android:inputType="textPassword" />

        <View
        android:layout_width="0sp"
        android:layout_height="fill_parent"
        android:layout_weight="1" />

    </LinearLayout>

    <View
        android:layout_width="fill_parent"
        android:layout_height="0sp"
        android:layout_weight="8" />

</LinearLayout>