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

<!-- Colored rectangle-->
<item>
    <shape android:shape="rectangle">
        <size
            android:width="100dp"
            android:height="40dp" />
        <solid android:color="#5EB888" />
        <corners android:radius="0dp"/>
    </shape>
</item>

<!-- This rectangle for the top arrow edge -->
<!-- Its color should be the same as the layout's background -->
<item
    android:top="-40dp"
    android:bottom="65dp"
    android:right="-30dp">
    <rotate
        android:fromDegrees="45">
        <shape android:shape="rectangle">
            <solid android:color="#ffffff" />
        </shape>
    </rotate>
</item>

<!-- This rectangle for the lower arrow edge -->
<!-- Its color should be the same as the layout's background -->
<item
    android:top="65dp"
    android:bottom="-40dp"
    android:right="-30dp">
    <rotate
        android:fromDegrees="-45">
        <shape android:shape="rectangle">
            <solid android:color="#ffffff" />
        </shape>
    </rotate>
</item>

</layer-list>

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@drawable/arrow_shape"/>

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

<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
    <item android:width="50dp" android:height="10dp" android:right="6dp">
        <shape>
            <solid android:color="@android:color/holo_green_dark"/>
            <corners
                android:bottomLeftRadius="2dp"
                android:topLeftRadius="2dp"/>
        </shape>
    </item>

    <item android:width="7dp" android:height="7dp"
        android:left="50dp">
        <rotate android:fromDegrees="45"
            android:pivotX="0"
            android:pivotY="0">
            <shape>
                <solid android:color="@android:color/holo_green_dark"/>
            </shape>
        </rotate>

    </item>

</layer-list>