themes.gradle

build.gradle

apply plugin: 'com.android.application'
apply from: 'themes.gradle'

def colorDisabled = 0xADADAD
android {
....
     productFlavors.whenObjectAdded { flavor ->
        themes_createExtension(flavor, 0x244124, 0x0B280B, 0x3D5A3D, 0x92bc00, colorDisabled)
    }
....
        productFlavors {
        prod {
        }
....
        devTL {
            //TealLime
            themes.useTheme (0x009688, 0x00796B, 0x19AFA1, 0xC6FF00, colorDisabled)
        }
        devOBG {
            //OrangeBlueGrey
            themes.useTheme (0xF57C00, 0xE65100, 0xFF9519, 0x78909C, colorDisabled)
        }
        devPG {
            //PurpleGreen
            themes.useTheme (0x9B26AF, 0x691A99, 0xB43FC8, 0x68EFAD, colorDisabled)
        }
    }
  }

generated.xml

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

    <!-- Automatically generated file. DO NOT MODIFY -->

    <!-- Values from product flavor: prod -->
    <color name="colorAccent">#92BC00</color>
    <color name="colorAccentA10">#1992BC00</color>
    <color name="colorAccentA20">#3392BC00</color>
    <color name="colorAccentA30">#4C92BC00</color>
    <color name="colorAccentA40">#6692BC00</color>
    <color name="colorAccentA50">#7F92BC00</color>
    <color name="colorAccentA60">#9992BC00</color>
    <color name="colorAccentA70">#B292BC00</color>
    <color name="colorAccentA80">#CC92BC00</color>
    <color name="colorAccentA90">#E592BC00</color>
    <color name="colorDisabled">#ADADAD</color>
    <color name="colorDisabledA10">#19ADADAD</color>
    <color name="colorDisabledA20">#33ADADAD</color>
    <color name="colorDisabledA30">#4CADADAD</color>
    <color name="colorDisabledA40">#66ADADAD</color>
    <color name="colorDisabledA50">#7FADADAD</color>
    <color name="colorDisabledA60">#99ADADAD</color>
    <color name="colorDisabledA70">#B2ADADAD</color>
    <color name="colorDisabledA80">#CCADADAD</color>
    <color name="colorDisabledA90">#E5ADADAD</color>
    <color name="colorPrimary">#244124</color>
    <color name="colorPrimaryA10">#19244124</color>
    <color name="colorPrimaryA20">#33244124</color>
    <color name="colorPrimaryA30">#4C244124</color>
    <color name="colorPrimaryA40">#66244124</color>
    <color name="colorPrimaryA50">#7F244124</color>
    <color name="colorPrimaryA60">#99244124</color>
    <color name="colorPrimaryA70">#B2244124</color>
    <color name="colorPrimaryA80">#CC244124</color>
    <color name="colorPrimaryA90">#E5244124</color>
    <color name="colorPrimaryDark">#0B280B</color>
    <color name="colorPrimaryDarkA10">#190B280B</color>
    <color name="colorPrimaryDarkA20">#330B280B</color>
    <color name="colorPrimaryDarkA30">#4C0B280B</color>
    <color name="colorPrimaryDarkA40">#660B280B</color>
    <color name="colorPrimaryDarkA50">#7F0B280B</color>
    <color name="colorPrimaryDarkA60">#990B280B</color>
    <color name="colorPrimaryDarkA70">#B20B280B</color>
    <color name="colorPrimaryDarkA80">#CC0B280B</color>
    <color name="colorPrimaryDarkA90">#E50B280B</color>
    <color name="colorPrimaryLight">#3D5A3D</color>

</resources>

or_incolors.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <!-- alpha 20% of colorAccent for even month row background -->
    <color name="good_row_month_even">@color/colorAccentA20</color>

</resources>

style.xml

<?xml version="1.0" encoding="utf-8"?>
<resources xmlns:tools="http://schemas.android.com/tools">

    <style name="AppBaseTheme" parent="Theme.AppCompat.Light.NoActionBar">
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
        <item name="alertDialogTheme">@style/AppTheme.Dialog.Alert</item>
    </style>

    <style name="AppTheme" parent="AppBaseTheme">

    </style>

    <style name="AppTheme.Dialog.Alert" parent="Theme.AppCompat.Dialog.Alert">
        <item name="colorAccent">@color/colorAccent</item>
    </style>

    <style name="AppTheme.Light.Dialog" parent="Theme.AppCompat.Light.Dialog">
        <item name="colorAccent">@color/colorAccent</item>
    </style>

</resources>

themes.gradle

public class ThemesExtension {
    def parent

    public ThemesExtension(parentIn, int colorPrimary, int colorPrimaryDark, int colorPrimaryLight, int colorAccent, int colorDisabled) {
        parent = parentIn
        useTheme(colorPrimary, colorPrimaryDark, colorPrimaryLight, colorAccent, colorDisabled)
    }

    public useTheme(int colorPrimary, int colorPrimaryDark, int colorPrimaryLight, int colorAccent, int colorDisabled) {
        def colors = [:]
        colors["colorPrimary"] = String.format("#%06X", colorPrimary)
        colors["colorPrimaryDark"] = String.format("#%06X", colorPrimaryDark)
        colors["colorPrimaryLight"] = String.format("#%06X", colorPrimaryLight)
        colors["colorAccent"] = String.format("#%06X", colorAccent)
        colors["colorDisabled"] = String.format("#%06X", colorDisabled)
        for (i in 1..9) {
            def alpha = (int) (i * 25.5)
            colors["colorPrimary" + "A" + i + "0"] = String.format("#%02X%06X", alpha, colorPrimary)
            colors["colorPrimaryDark" + "A" + i + "0"] = String.format("#%02X%06X", alpha, colorPrimaryDark)
            colors["colorAccent" + "A" + i + "0"] = String.format("#%02X%06X", alpha, colorAccent)
            colors["colorDisabled" + "A" + i + "0"] = String.format("#%02X%06X", alpha, colorDisabled)
        }
        colors.each {n, v ->
            this.parent.resValue("color", n, v)
        }
    }
}
ext {
    themes_createExtension = { parent, colorPrimary, colorPrimaryDark, colorPrimaryLight, colorAccent, colorDisabled ->
        parent.extensions.create("themes", ThemesExtension, parent, colorPrimary, colorPrimaryDark, colorPrimaryLight, colorAccent, colorDisabled)
    }
}