Android, setting background color of button loses ripple effect

After adding color to an android button, it loses its ripple effect that makes the user feel like there is a responsive click. How do I fix this? I've searched through many solutions but I couldn't find a definite one that wasn't ambiguous.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                xmlns:tools="http://schemas.android.com/tools"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                tools:context=".ClockInOutFragment">


    <AnalogClock
        android:id="@+id/clock"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:layout_toRightOf="@+id/date_and_time"/>


    <RelativeLayout
        android:id="@+id/date_and_time"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="10dp">

        <TextView
            android:id="@+id/time_digits"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="12:10"
            android:textSize="45sp"/>

        <TextView
            android:id="@+id/am_pm"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBaseline="@+id/time_digits"
            android:layout_toRightOf="@+id/time_digits"
            android:paddingLeft="3dp"
            android:text="PM"
            android:textSize="20sp"/>

        <TextView
            android:id="@+id/date"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/time_digits"
            android:text="Mon, July 11"
            android:textSize="22sp"/>
    </RelativeLayout>

    <!--Clock in and out buttons-->
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:orientation="horizontal">

        <Button
            android:id="@+id/textView3"
            android:layout_width="0dp"
            android:layout_height="56dp"
            android:layout_weight="1"
            android:background="#4CAF50"
            android:gravity="center"
            android:text="Clock In"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:textColor="#FFFFFF"/>

        <!--Divider between the clock in and out button-->
        <View
            android:layout_width="1dp"
            android:layout_height="match_parent"
            android:background="#B6B6B6"/>

        <Button
            android:id="@+id/textView4"
            android:layout_width="0dp"
            android:layout_height="56dp"
            android:layout_weight="1"
            android:background="#FF5252"
            android:gravity="center"
            android:text="Clock Out"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:textColor="#FFFFFF"/>
    </LinearLayout>


</RelativeLayout>

You can add the ripple effect & background color with an additionnal ripple drawable:

your layout :

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

    <Button
        android:id="@+id/button_connect"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dip"
        android:fontFamily="sans-serif"
        android:text="Connect"
        android:background="@drawable/ripple"
        android:textColor="#FFFFFF"
        android:textSize="18sp" />

</LinearLayout>

ripple.xml (this is where you can add background color in addition to the ripple effect) :

<?xml version="1.0" encoding="utf-8"?>
<!-- in drawable folder-->
<ripple
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:color="?android:colorControlHighlight">

    <item android:id="@android:id/mask">
        <shape android:shape="rectangle">
            <solid android:color="?android:colorAccent" />
        </shape>
    </item>

    <item>
        <shape android:shape="rectangle">
            <!-- put your background color here-->
            <solid android:color="@color/default_color" />
        </shape>
    </item>

</ripple>