layout login with google and facebook

fragment_login.xml

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

    <LinearLayout
        android:layout_height="wrap_content"
        android:layout_width="match_parent">
        <ImageView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:src="@drawable/bg_welcome"
            android:contentDescription="@string/app_name"/>
    </LinearLayout>

    <LinearLayout
        android:layout_height="match_parent"
        android:layout_width="match_parent"
        android:padding="@dimen/activity_horizontal_margin"
        android:layout_gravity="bottom"
        android:gravity="bottom"
        android:orientation="vertical">
        <com.google.android.gms.common.SignInButton
            android:id="@+id/google_login"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp"
            android:layout_marginBottom="20dp" />
        <com.facebook.login.widget.LoginButton
            android:id="@+id/facebook_login"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp"
            android:layout_marginBottom="20dp" />
    </LinearLayout>

</RelativeLayout>