button_login_facebook.xml

<?xml version="1.0" encoding="utf-8"?>
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
	android:color="@color/blue_facebook_dark">
	<item>
		<shape android:shape="rectangle" >
			<corners android:radius="10dp"/>
			<solid android:color="@color/blue_facebook"/>
		</shape>
	</item>
</ripple>

button_login_facebook_active.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <corners android:radius="10dp" />
    <solid android:color="@color/blue_facebook_dark" />
</shape>

colors.xml

<resources>
    <color name="blue_facebook">#3B5898</color>
    <color name="blue_facebook_dark">#314B86</color>
</resources>

facebook_button.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/facebook_login_button"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@drawable/button_login_facebook"
    android:gravity="center">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:drawableLeft="@drawable/fb_f_icon"
        android:drawableStart="@drawable/fb_f_icon"
        android:text="@string/facebook_login_text"
        android:drawablePadding="@dimen/content_margin_8"
        android:background="@null"
        android:clickable="false"
        android:textColor="@color/white" />

</LinearLayout>