Use shape drawable for button asset, enable shadows

        <set>

            <objectAnimator android:propertyName="translationZ"

                            android:duration="@integer/button_pressed_animation_duration"

                            android:valueTo="@dimen/button_pressed_z"

                            android:valueTo="@dimen/button_pressed_z_material"

                            android:valueType="floatType"/>

            <objectAnimator android:propertyName="elevation"

                            android:duration="0"

                            android:valueTo="@dimen/button_elevation_material"

                            android:valueType="floatType"/>

        </set>

    </item>

    <!-- base state -->

    <item>

    <item android:state_enabled="true">

        <set>

            <objectAnimator android:propertyName="translationZ"

                            android:duration="@integer/button_pressed_animation_duration"

                            android:valueTo="0"

                            android:startDelay="@integer/button_pressed_animation_delay"

                            android:valueType="floatType"/>

            <objectAnimator android:propertyName="elevation"

                            android:duration="0"

                            android:valueTo="@dimen/button_elevation_material"

                            android:valueType="floatType" />

        </set>

    </item>

    <item>

        <set>

            <objectAnimator android:propertyName="translationZ"

                            android:duration="0"

                            android:valueTo="0"

                            android:valueType="floatType"/>

            <objectAnimator android:propertyName="elevation"

                            android:duration="0"

                            android:valueTo="0"

                            android:valueType="floatType"/>

        </set>

    </item>