I want to create a custom Button in my app, like the image below: 
 
 
This is a Button from an app where when I press it, another Activity starts.
How can I create a Button like this?
I'll appreciate any help.
Editted:
button_back.xml :
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" >
<gradient
    android:angle="90"
    android:startColor="#4080FE"
    android:centerColor="#4080FE"
    android:endColor="#4080FE"
    android:type="linear" />
<corners
    android:radius="500dp"/>
<size
    android:width="40dp"
    android:height="40dp"
    />
and in layout :
<Button
    android:layout_width="wrap_content"
    android:layout_height="80dp"
    android:drawableLeft="@drawable/btn"
    android:background="@drawable/button_back" 
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="94dp" />
I don't want those red circles to be shown; I want my button be the same as first picture without any boredr.
Thank you for your helping.
Last Edition:
I used imageButton instead of button and it is correct solution for my case.

 
     
    

 
    
 
     
     
     
    