alert/drawable-anydpi-v21/ic_add_alert_black_24dp.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
        android:width="24dp"
        android:height="24dp"
        android:viewportWidth="24.0"
        android:viewportHeight="24.0">
    <path
        android:fillColor="#FF000000"
        android:pathData="M10.01,21.01c0,1.1 0.89,1.99 1.99,1.99s1.99,-0.89 1.99,-1.99h-3.98zM18.88,16.82L18.88,11c0,-3.25 -2.25,-5.97 -5.29,-6.69v-0.72C13.59,2.71 12.88,2 12,2s-1.59,0.71 -1.59,1.59v0.72C7.37,5.03 5.12,7.75 5.12,11v5.82L3,18.94L3,20h18v-1.06l-2.12,-2.12zM16,13.01h-3v3h-2v-3L8,13.01L8,11h3L11,8h2v3h3v2.01z"/>
</vector>