res/drawable/toggle_speaker_selector.xml

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

    <item android:state_checked="false"><layer-list>
            <item><shape android:shape="rectangle">
                    <solid android:color="@color/sfl_blue_0" />

                    <stroke android:width="1dp" android:color="@color/sfl_blue_lines" />

                    <corners android:radius="2dp" />

                    <padding android:bottom="10dp" android:left="10dp" android:right="10dp" android:top="10dp" />
                </shape></item>
            <item><bitmap android:gravity="center_horizontal" android:src="@drawable/ic_action_volume_on" />
            </item>
        </layer-list></item>
    <item android:state_checked="true"><layer-list>
            <item><shape android:shape="rectangle">
                    <solid android:color="@color/sfl_action_blue" />

                    <stroke android:width="1dp" android:color="@color/sfl_blue_lines" />

                    <corners android:radius="2dp" />

                    <padding android:bottom="10dp" android:left="10dp" android:right="10dp" android:top="10dp" />
                </shape></item>
            <item><bitmap android:gravity="center_horizontal" android:src="@drawable/ic_action_volume_on" />
            </item>
        </layer-list></item>

</selector>