Android Text view position with custom buttons in the layout

I've the following layout

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

    <Button android:id="@+id/mq_categories" android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:layout_margin="5dp"
        android:text="Browse Quiz Categories" android:textColor="#EDFF99"
        android:background="@drawable/custom_button" />
    <Button android:id="@+id/mq_random" android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:layout_margin="5dp"
        android:text="Enter Random Quiz" android:textColor="#EDFF99"
        android:background="@drawable/custom_button" />
    <Button android:id="@+id/mq_profile" android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:layout_margin="5dp"
        android:text="My Profile" android:textColor="#EDFF99"
        android:background="@drawable/custom_button" />

</LinearLayout>

which gives the output as

Now I need to add a welcome text at the top section of the screen

When I added the text view like this, only welcome text is displayed and no buttons and no scroll

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

    <TextView xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/mg_userinfo" android:layout_width="fill_parent"
        android:layout_height="fill_parent" android:text="Welcome"
        android:gravity="center" />

    <Button android:id="开发者_C百科@+id/mq_categories" android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:layout_margin="5dp"
        android:text="Browse Quiz Categories" android:textColor="#EDFF99"
        android:background="@drawable/custom_button" />
    <Button android:id="@+id/mq_random" android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:layout_margin="5dp"
        android:text="Enter Random Quiz" android:textColor="#EDFF99"
        android:background="@drawable/custom_button" />
    <Button android:id="@+id/mq_profile" android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:layout_margin="5dp"
        android:text="My Profile" android:textColor="#EDFF99"
        android:background="@drawable/custom_button" />


</LinearLayout>

When tried below lay out welcome text is displayed at the bottom of the buttons, but buttons got shifted to the top of the screen

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

    <Button android:id="@+id/mq_categories" android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:layout_margin="5dp"
        android:text="Browse Quiz Categories" android:textColor="#EDFF99"
        android:background="@drawable/custom_button" />
    <Button android:id="@+id/mq_random" android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:layout_margin="5dp"
        android:text="Enter Random Quiz" android:textColor="#EDFF99"
        android:background="@drawable/custom_button" />
    <Button android:id="@+id/mq_profile" android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:layout_margin="5dp"
        android:text="My Profile" android:textColor="#EDFF99"
        android:background="@drawable/custom_button" />

    <TextView xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/mg_userinfo" android:layout_width="fill_parent"
        android:layout_height="fill_parent" android:text="Welcome"
        android:gravity="center" />

</LinearLayout>

How can I need to add a welcome text at the top section of the screen with button on the center?

Change the following property of textview:

android:layout_width="wrap_content"
android:layout_height="wrap_content" 

And put your textview above the buttons.

if you use

android:layout_height="fill_parent"

android will fill to full screen. you can use

android:layout_height="20DIP"

or

android:layout_height="20px"