keyboard_popupkey_background.xml

<?xml version="1.0" encoding="utf-8"?>

<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:state_pressed="true">

        <layer-list>

            <item>

                <shape android:shape="rectangle">

                    <padding android:bottom="@dimen/keyboard_key_pressed_padding"/>

                    <solid android:color="#00000000"/>

                </shape>

            </item>

            <item>

                <shape android:shape="rectangle">

                    <padding android:bottom="@dimen/keyboard_key_pressed_padding"/>

                    <solid android:color="#10000000"/>

                </shape>

            </item>

            <item>

                <shape android:shape="rectangle">

                    <padding android:bottom="@dimen/keyboard_key_pressed_padding"/>

                    <solid android:color="#20000000"/>

                </shape>

            </item>

            <item>

                <shape android:shape="rectangle">

                    <padding android:bottom="@dimen/keyboard_key_pressed_padding"/>

                    <solid android:color="#30000000"/>

                </shape>

            </item>

            <item>

                <shape android:shape="rectangle">

                    <padding android:bottom="@dimen/keyboard_key_pressed_padding"/>

                    <solid android:color="#50000000"/>

                </shape>

            </item>

            <item>

                <shape android:shape="rectangle" android:tint="@color/void_color"/>

            </item>

        </layer-list>

    </item>

    <item android:state_hovered="true">

        <layer-list>

            <item>

                <shape android:shape="rectangle">

                    <padding android:bottom="@dimen/keyboard_key_pressed_padding"/>

                    <solid android:color="#00000000"/>

                </shape>

            </item>

            <item>

                <shape android:shape="rectangle">

                    <padding android:bottom="@dimen/keyboard_key_pressed_padding"/>

                    <solid android:color="#10000000"/>

                </shape>

            </item>

            <item>

                <shape android:shape="rectangle">

                    <padding android:bottom="@dimen/keyboard_key_pressed_padding"/>

                    <solid android:color="#20000000"/>

                </shape>

            </item>

            <item>

                <shape android:shape="rectangle">

                    <padding android:bottom="@dimen/keyboard_key_pressed_padding"/>

                    <solid android:color="#30000000"/>

                </shape>

            </item>

            <item>

                <shape android:shape="rectangle">

                    <padding android:bottom="@dimen/keyboard_key_pressed_padding"/>

                    <solid android:color="#50000000"/>

                </shape>

            </item>

            <item>

                <shape android:shape="rectangle" android:tint="@color/azure"/>

            </item>

        </layer-list>

    </item>

    <item android:state_hovered="false" android:drawable="@null">

        <layer-list>

            <item>

                <shape android:shape="rectangle">

                    <padding android:bottom="@dimen/keyboard_key_pressed_padding"/>

                    <solid android:color="#00000000"/>

                </shape>

            </item>

            <item>

                <shape android:shape="rectangle">

                    <padding android:bottom="@dimen/keyboard_key_pressed_padding"/>

                    <solid android:color="#10000000"/>

                </shape>

            </item>

            <item>

                <shape android:shape="rectangle">

                    <padding android:bottom="@dimen/keyboard_key_pressed_padding"/>

                    <solid android:color="#20000000"/>

                </shape>

            </item>

            <item>

                <shape android:shape="rectangle">

                    <padding android:bottom="@dimen/keyboard_key_pressed_padding"/>

                    <solid android:color="#30000000"/>

                </shape>

            </item>

            <item>

                <shape android:shape="rectangle">

                    <padding android:bottom="@dimen/keyboard_key_pressed_padding"/>

                    <solid android:color="#50000000"/>

                </shape>

            </item>

            <item>

                <shape android:shape="rectangle" android:tint="@color/fog"/>

            </item>

        </layer-list>

    </item>

</selector>