Android add traslucid overlayer to image

I'm begginer in android. I'm developing an app, and I want this effect:

I think it is a background image, an overlay whit traslucid color, and a textView.

My layout is this:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent" >

<ImageView
    android:id="@+id/backgroundImage"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    android:contentDescription="Description" />

<ImageView
    android:id="@+id/overlay"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    android:background="#AAFF0000"
    android:contentDescription="Description" />

<TextView
    android:id="@+id/textoOpcion"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    android:text="TextView" />

</RelativeLayout>

But this doesn't work.

Any idea to do it?

try like this i hope it will work for u..

this image is exist by giving textview background color as #44ff0000

u can chane the opacity of color by changing first two values of color code 00 to ff

#44ff0000 here 44 is opacity for coloor ff0000

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent" >

<ImageView
    android:id="@+id/backgroundImage"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    android:contentDescription="Description"
    android:src="@drawable/ic_launcher" />

<TextView
    android:id="@+id/textoOpcion"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBottom="@+id/backgroundImage"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    android:layout_alignRight="@+id/backgroundImage"
    android:background="#44000000"
    android:gravity="bottom"
    android:text="TextView"
    android:textColor="#ffffff" />

</RelativeLayout>