how to set a text over an imageView?

Question

I am placing an application bar on the top of the screen and it looks as the following figure:

Answer 1

That's how I did it and it worked exactly as you asked for:

<ImageView
    android:id="@+id/myImageView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/myImageSouce" />

<TextView
    android:id="@+id/myImageViewText"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/myImageView"
    android:layout_alignTop="@+id/myImageView"
    android:layout_alignRight="@+id/myImageView"
    android:layout_alignBottom="@+id/myImageView"
    android:layout_margin="1dp"
    android:gravity="center"
    android:text="Hello"
    android:textColor="#000000" />

Use Relative layout for this

Answer 2

If i guessed correctly you are trying to use Header for you sample..

Set Background as that image and Add text view to that like this..

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_height="55px"
    android:background="@drawable/testheader"
    android:layout_width="fill_parent"
    android:orientation="horizontal">           
        <TextView android:id="@+id/quaddeal_header_text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="12dip"
            android:text="Campus"
            android:textSize="20sp"
            android:textColor="@color/white"
            android:layout_marginLeft="90dip"/>
</RelativeLayout>

Or else You have to merge the Layouts by using Framelayout.

Check this Sample for Frame Layout