Color button text should be primary for better contrast

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

    <item android:state_enabled="false"

          android:alpha="?attr/disabledAlpha"

          android:color="?attr/textColorSecondary" />

    <item android:color="?attr/textColorSecondaryInverse" />

          android:color="?attr/textColorPrimary" />

    <item android:color="?attr/textColorPrimaryInverse" />

</selector>