diff --git a/chartLib/src/main/kotlin/info/appdev/charting/charts/RadarChart.kt b/chartLib/src/main/kotlin/info/appdev/charting/charts/RadarChart.kt
index b95736816..2ff26e4ac 100644
--- a/chartLib/src/main/kotlin/info/appdev/charting/charts/RadarChart.kt
+++ b/chartLib/src/main/kotlin/info/appdev/charting/charts/RadarChart.kt
@@ -4,6 +4,7 @@ import android.content.Context
 import android.graphics.Canvas
 import android.graphics.Color
 import android.util.AttributeSet
+import androidx.annotation.ColorInt
 import info.appdev.charting.components.YAxis
 import info.appdev.charting.components.YAxis.AxisDependency
 import info.appdev.charting.data.RadarData
@@ -39,6 +40,7 @@ open class RadarChart : PieRadarChartBase<RadarData> {
     /**
      * color for the main web lines
      */
+    @ColorInt
     var webColor: Int = Color.rgb(122, 122, 122)
 
     /**
diff --git a/chartLib/src/main/kotlin/info/appdev/charting/components/AxisBase.kt b/chartLib/src/main/kotlin/info/appdev/charting/components/AxisBase.kt
index b331c3f75..7eaa5d652 100644
--- a/chartLib/src/main/kotlin/info/appdev/charting/components/AxisBase.kt
+++ b/chartLib/src/main/kotlin/info/appdev/charting/components/AxisBase.kt
@@ -3,6 +3,7 @@ package info.appdev.charting.components
 import android.graphics.Color
 import android.graphics.DashPathEffect
 import android.graphics.Paint
+import androidx.annotation.ColorInt
 import info.appdev.charting.formatter.DefaultAxisValueFormatter
 import info.appdev.charting.formatter.IAxisValueFormatter
 import info.appdev.charting.utils.convertDpToPixel
@@ -22,6 +23,7 @@ abstract class AxisBase : ComponentBase() {
      * The color of the grid lines for this axis (the horizontal lines
      * coming from each label).
      */
+    @ColorInt
     var gridColor: Int = Color.GRAY
 
     private var mGridLineWidth = 1f
@@ -29,9 +31,7 @@ abstract class AxisBase : ComponentBase() {
     /**
      * Returns the color of the axis line (line alongside the axis).
      */
-    /**
-     * Sets the color of the border surrounding the chart.
-     */
+    @ColorInt
     var axisLineColor: Int = Color.GRAY
 
     private var mAxisLineWidth = 1f
diff --git a/chartLib/src/main/kotlin/info/appdev/charting/components/ComponentBase.kt b/chartLib/src/main/kotlin/info/appdev/charting/components/ComponentBase.kt
index 5f80c3079..c83b5e926 100644
--- a/chartLib/src/main/kotlin/info/appdev/charting/components/ComponentBase.kt
+++ b/chartLib/src/main/kotlin/info/appdev/charting/components/ComponentBase.kt
@@ -2,6 +2,7 @@ package info.appdev.charting.components
 
 import android.graphics.Color
 import android.graphics.Typeface
+import androidx.annotation.ColorInt
 import info.appdev.charting.utils.convertDpToPixel
 
 /**
@@ -37,6 +38,7 @@ abstract class ComponentBase {
     /**
      * the text color to use for the labels
      */
+    @ColorInt
     open var textColor: Int = Color.BLACK
 
     /**
diff --git a/chartLib/src/main/kotlin/info/appdev/charting/components/LegendEntry.kt b/chartLib/src/main/kotlin/info/appdev/charting/components/LegendEntry.kt
index a7d10135d..1f6401ded 100644
--- a/chartLib/src/main/kotlin/info/appdev/charting/components/LegendEntry.kt
+++ b/chartLib/src/main/kotlin/info/appdev/charting/components/LegendEntry.kt
@@ -1,6 +1,7 @@
 package info.appdev.charting.components
 
 import android.graphics.DashPathEffect
+import androidx.annotation.ColorInt
 import info.appdev.charting.components.Legend.LegendForm
 import info.appdev.charting.utils.ColorTemplate
 
@@ -23,7 +24,7 @@ class LegendEntry {
         formSize: Float,
         formLineWidth: Float,
         formLineDashEffect: DashPathEffect?,
-        formColor: Int
+        @ColorInt formColor: Int
     ) {
         this.label = label
         this.form = form
@@ -72,5 +73,6 @@ class LegendEntry {
     /**
      * The color for drawing the form
      */
+    @ColorInt
     var formColor: Int = ColorTemplate.COLOR_NONE
 }
\ No newline at end of file
diff --git a/chartLib/src/main/kotlin/info/appdev/charting/components/LimitLine.kt b/chartLib/src/main/kotlin/info/appdev/charting/components/LimitLine.kt
index aa149ed11..1a24589b0 100644
--- a/chartLib/src/main/kotlin/info/appdev/charting/components/LimitLine.kt
+++ b/chartLib/src/main/kotlin/info/appdev/charting/components/LimitLine.kt
@@ -3,6 +3,7 @@ package info.appdev.charting.components
 import android.graphics.Color
 import android.graphics.DashPathEffect
 import android.graphics.Paint
+import androidx.annotation.ColorInt
 import info.appdev.charting.utils.convertDpToPixel
 
 /**
@@ -18,6 +19,7 @@ class LimitLine : ComponentBase {
     private var mLineWidth = 2f
 
     /** the color of the limit line  */
+    @ColorInt
     var lineColor: Int = Color.rgb(237, 91, 91)
 
     /** the style of the label text  */
diff --git a/chartLib/src/main/kotlin/info/appdev/charting/components/LimitRange.kt b/chartLib/src/main/kotlin/info/appdev/charting/components/LimitRange.kt
index 04bcc8ec5..e69f15c4e 100644
--- a/chartLib/src/main/kotlin/info/appdev/charting/components/LimitRange.kt
+++ b/chartLib/src/main/kotlin/info/appdev/charting/components/LimitRange.kt
@@ -3,6 +3,7 @@ package info.appdev.charting.components
 import android.graphics.Color
 import android.graphics.DashPathEffect
 import android.graphics.Paint
+import androidx.annotation.ColorInt
 import info.appdev.charting.components.LimitLine.LimitLabelPosition
 import info.appdev.charting.utils.convertDpToPixel
 
@@ -40,11 +41,13 @@ class LimitRange : ComponentBase {
     /**
      * the color of the limit line
      */
+    @ColorInt
     var lineColor: Int = Color.rgb(237, 91, 91)
 
     /**
      * the color of the Range
      */
+    @ColorInt
     var rangeColor: Int = Color.rgb(128, 128, 128)
 
     /**
diff --git a/chartLib/src/main/kotlin/info/appdev/charting/components/YAxis.kt b/chartLib/src/main/kotlin/info/appdev/charting/components/YAxis.kt
index bfde382cd..29938b74a 100644
--- a/chartLib/src/main/kotlin/info/appdev/charting/components/YAxis.kt
+++ b/chartLib/src/main/kotlin/info/appdev/charting/components/YAxis.kt
@@ -2,6 +2,7 @@ package info.appdev.charting.components
 
 import android.graphics.Color
 import android.graphics.Paint
+import androidx.annotation.ColorInt
 import info.appdev.charting.utils.calcTextHeight
 import info.appdev.charting.utils.calcTextWidth
 import info.appdev.charting.utils.convertDpToPixel
@@ -43,6 +44,7 @@ open class YAxis : AxisBase {
     /**
      * Color of the zero line
      */
+    @ColorInt
     var zeroLineColor: Int = Color.GRAY
 
     /**
diff --git a/chartLib/src/main/kotlin/info/appdev/charting/data/BarDataSet.kt b/chartLib/src/main/kotlin/info/appdev/charting/data/BarDataSet.kt
index 7d7505e19..0dc1a85ff 100644
--- a/chartLib/src/main/kotlin/info/appdev/charting/data/BarDataSet.kt
+++ b/chartLib/src/main/kotlin/info/appdev/charting/data/BarDataSet.kt
@@ -1,6 +1,7 @@
 package info.appdev.charting.data
 
 import android.graphics.Color
+import androidx.annotation.ColorInt
 import info.appdev.charting.interfaces.datasets.IBarDataSet
 import info.appdev.charting.utils.Fill
 
@@ -14,10 +15,12 @@ open class BarDataSet(yVals: MutableList<BarEntry>, label: String) : BarLineScat
     /**
      * the color used for drawing the bar shadows
      */
+    @ColorInt
     private var mBarShadowColor = Color.rgb(215, 215, 215)
 
     private var mBarBorderWidth = 0.0f
 
+    @ColorInt
     private var mBarBorderColor = Color.BLACK
 
     /**
@@ -89,7 +92,7 @@ open class BarDataSet(yVals: MutableList<BarEntry>, label: String) : BarLineScat
     /**
      * Sets the start and end color for gradient color, ONLY color that should be used for this DataSet.
      */
-    fun setGradientColor(startColor: Int, endColor: Int) {
+    fun setGradientColor(@ColorInt startColor: Int, @ColorInt endColor: Int) {
         gradients.clear()
         gradients.add(Fill(startColor, endColor))
     }
diff --git a/chartLib/src/main/kotlin/info/appdev/charting/data/BarLineScatterCandleBubbleDataSet.kt b/chartLib/src/main/kotlin/info/appdev/charting/data/BarLineScatterCandleBubbleDataSet.kt
index 8e7ee1f1d..4b5a11391 100644
--- a/chartLib/src/main/kotlin/info/appdev/charting/data/BarLineScatterCandleBubbleDataSet.kt
+++ b/chartLib/src/main/kotlin/info/appdev/charting/data/BarLineScatterCandleBubbleDataSet.kt
@@ -1,6 +1,7 @@
 package info.appdev.charting.data
 
 import android.graphics.Color
+import androidx.annotation.ColorInt
 import info.appdev.charting.interfaces.datasets.IBarLineScatterCandleBubbleDataSet
 
 /**
@@ -11,6 +12,7 @@ abstract class BarLineScatterCandleBubbleDataSet<T : Entry>(yVals: MutableList<T
     /**
      * Sets the color that is used for drawing the highlight indicators.
      */
+    @ColorInt
     override var highLightColor: Int = Color.rgb(255, 187, 115)
 
     protected fun copy(barLineScatterCandleBubbleDataSet: BarLineScatterCandleBubbleDataSet<*>) {
diff --git a/chartLib/src/main/kotlin/info/appdev/charting/data/BaseDataSet.kt b/chartLib/src/main/kotlin/info/appdev/charting/data/BaseDataSet.kt
index aaa9e934b..fb601e939 100644
--- a/chartLib/src/main/kotlin/info/appdev/charting/data/BaseDataSet.kt
+++ b/chartLib/src/main/kotlin/info/appdev/charting/data/BaseDataSet.kt
@@ -4,6 +4,7 @@ import android.content.Context
 import android.graphics.Color
 import android.graphics.DashPathEffect
 import android.graphics.Typeface
+import androidx.annotation.ColorInt
 import androidx.core.content.ContextCompat
 import info.appdev.charting.components.Legend.LegendForm
 import info.appdev.charting.components.YAxis.AxisDependency
@@ -22,11 +23,13 @@ abstract class BaseDataSet<T : Entry>() : IDataSet<T> {
     /**
      * List representing all colors that are used for this DataSet
      */
+    @ColorInt
     protected var mColors: MutableList<Int>
 
     /**
      * List representing all colors that are used for drawing the actual values for this DataSet
      */
+    @ColorInt
     protected var mValueColors: MutableList<Int>
 
     /**
diff --git a/chartLib/src/main/kotlin/info/appdev/charting/data/CandleDataSet.kt b/chartLib/src/main/kotlin/info/appdev/charting/data/CandleDataSet.kt
index e41c653b5..47d4b821e 100644
--- a/chartLib/src/main/kotlin/info/appdev/charting/data/CandleDataSet.kt
+++ b/chartLib/src/main/kotlin/info/appdev/charting/data/CandleDataSet.kt
@@ -1,6 +1,7 @@
 package info.appdev.charting.data
 
 import android.graphics.Paint
+import androidx.annotation.ColorInt
 import info.appdev.charting.interfaces.datasets.ICandleDataSet
 import info.appdev.charting.utils.ColorTemplate
 import info.appdev.charting.utils.convertDpToPixel
@@ -48,21 +49,25 @@ open class CandleDataSet(yVals: MutableList<CandleEntry>?, label: String = "") :
     /**
      * color for open == close
      */
+    @ColorInt
     protected var mNeutralColor: Int = ColorTemplate.COLOR_SKIP
 
     /**
      * color for open < close
      */
+    @ColorInt
     protected var mIncreasingColor: Int = ColorTemplate.COLOR_SKIP
 
     /**
      * color for open > close
      */
+    @ColorInt
     protected var mDecreasingColor: Int = ColorTemplate.COLOR_SKIP
 
     /**
      * shadow line color, set -1 for backward compatibility and uses default color
      */
+    @ColorInt
     protected var mShadowColor: Int = ColorTemplate.COLOR_SKIP
 
     override fun copy(): DataSet<CandleEntry> {
diff --git a/chartLib/src/main/kotlin/info/appdev/charting/data/LineDataSet.kt b/chartLib/src/main/kotlin/info/appdev/charting/data/LineDataSet.kt
index cf952d273..9627f2184 100644
--- a/chartLib/src/main/kotlin/info/appdev/charting/data/LineDataSet.kt
+++ b/chartLib/src/main/kotlin/info/appdev/charting/data/LineDataSet.kt
@@ -3,6 +3,7 @@ package info.appdev.charting.data
 import android.content.Context
 import android.graphics.Color
 import android.graphics.DashPathEffect
+import androidx.annotation.ColorInt
 import androidx.core.content.ContextCompat
 import info.appdev.charting.formatter.DefaultFillFormatter
 import info.appdev.charting.formatter.IFillFormatter
@@ -30,11 +31,13 @@ open class LineDataSet(yVals: MutableList<Entry>?, label: String = "") : LineRad
     /**
      * List representing all colors that are used for the circles
      */
+    @ColorInt
     var circleColors: MutableList<Int> = mutableListOf()
 
     /**
      * the color of the inner circles
      */
+    @ColorInt
     private var mCircleHoleColor = Color.WHITE
 
     /**
@@ -247,7 +250,7 @@ open class LineDataSet(yVals: MutableList<Entry>?, label: String = "") : LineRad
      * this method. Internally, the colors are resolved using
      * getResources().getColor(...)
      */
-    fun setCircleColors(colors: IntArray, context: Context) {
+    fun setCircleColors(@ColorInt colors: IntArray, context: Context) {
         val clrs = this.circleColors
         clrs.clear()
 
diff --git a/chartLib/src/main/kotlin/info/appdev/charting/data/LineRadarDataSet.kt b/chartLib/src/main/kotlin/info/appdev/charting/data/LineRadarDataSet.kt
index b7c8c61ad..5b39cff2d 100644
--- a/chartLib/src/main/kotlin/info/appdev/charting/data/LineRadarDataSet.kt
+++ b/chartLib/src/main/kotlin/info/appdev/charting/data/LineRadarDataSet.kt
@@ -2,6 +2,7 @@ package info.appdev.charting.data
 
 import android.graphics.Color
 import android.graphics.drawable.Drawable
+import androidx.annotation.ColorInt
 import info.appdev.charting.interfaces.datasets.ILineRadarDataSet
 import info.appdev.charting.utils.convertDpToPixel
 
@@ -13,6 +14,7 @@ abstract class LineRadarDataSet<T : Entry>(yVals: MutableList<T>?, label: String
     /**
      * the color that is used for filling the line surface
      */
+    @ColorInt
     private var mFillColor = Color.rgb(140, 234, 255)
 
     /**
diff --git a/chartLib/src/main/kotlin/info/appdev/charting/data/PieDataSet.kt b/chartLib/src/main/kotlin/info/appdev/charting/data/PieDataSet.kt
index bc33c6a30..46cb68f28 100644
--- a/chartLib/src/main/kotlin/info/appdev/charting/data/PieDataSet.kt
+++ b/chartLib/src/main/kotlin/info/appdev/charting/data/PieDataSet.kt
@@ -1,5 +1,6 @@
 package info.appdev.charting.data
 
+import androidx.annotation.ColorInt
 import info.appdev.charting.interfaces.datasets.IPieDataSet
 import info.appdev.charting.utils.convertDpToPixel
 
@@ -24,6 +25,7 @@ open class PieDataSet(yVals: MutableList<PieEntry>?, label: String) : DataSet<Pi
     private var mValueLinePart1Length = 0.3f
     private var mValueLinePart2Length = 0.4f
     private var mIsValueLineVariableLength = true
+    @ColorInt
     private var mHighlightColor: Int? = null
 
     override fun copy(): DataSet<PieEntry> {
diff --git a/chartLib/src/main/kotlin/info/appdev/charting/data/RadarDataSet.kt b/chartLib/src/main/kotlin/info/appdev/charting/data/RadarDataSet.kt
index a195168ad..0b0893046 100644
--- a/chartLib/src/main/kotlin/info/appdev/charting/data/RadarDataSet.kt
+++ b/chartLib/src/main/kotlin/info/appdev/charting/data/RadarDataSet.kt
@@ -1,6 +1,7 @@
 package info.appdev.charting.data
 
 import android.graphics.Color
+import androidx.annotation.ColorInt
 import info.appdev.charting.interfaces.datasets.IRadarDataSet
 import info.appdev.charting.utils.ColorTemplate
 
@@ -8,10 +9,12 @@ open class RadarDataSet(yVals: MutableList<RadarEntry>?, label: String = "") : L
     /** flag indicating whether highlight circle should be drawn or not */
     protected var mDrawHighlightCircleEnabled: Boolean = false
 
+    @ColorInt
     protected var mHighlightCircleFillColor: Int = Color.WHITE
 
     /** The stroke color for highlight circle.
      * If Utils.COLOR_NONE, the color of the dataset is taken. */
+    @ColorInt
     protected var mHighlightCircleStrokeColor: Int = ColorTemplate.COLOR_NONE
 
     protected var mHighlightCircleStrokeAlpha: Int = (0.3 * 255).toInt()
diff --git a/chartLib/src/main/kotlin/info/appdev/charting/data/ScatterDataSet.kt b/chartLib/src/main/kotlin/info/appdev/charting/data/ScatterDataSet.kt
index 9d9d025a6..8ab7fa3b0 100644
--- a/chartLib/src/main/kotlin/info/appdev/charting/data/ScatterDataSet.kt
+++ b/chartLib/src/main/kotlin/info/appdev/charting/data/ScatterDataSet.kt
@@ -1,5 +1,6 @@
 package info.appdev.charting.data
 
+import androidx.annotation.ColorInt
 import info.appdev.charting.charts.ScatterChart.ScatterShape
 import info.appdev.charting.interfaces.datasets.IScatterDataSet
 import info.appdev.charting.renderer.scatter.ChevronDownShapeRenderer
@@ -34,6 +35,7 @@ open class ScatterDataSet(yVals: MutableList<Entry>?, label: String = "") : Line
      * Setting to `ColorTemplate.COLOR_NONE` will behave as transparent.
      * - default: ColorTemplate.COLOR_NONE
      */
+    @ColorInt
     private var mScatterShapeHoleColor = ColorTemplate.COLOR_NONE
 
     override fun copy(): DataSet<Entry> {
diff --git a/chartLib/src/main/kotlin/info/appdev/charting/interfaces/datasets/IBarDataSet.kt b/chartLib/src/main/kotlin/info/appdev/charting/interfaces/datasets/IBarDataSet.kt
index a29dc8da7..0940bc245 100644
--- a/chartLib/src/main/kotlin/info/appdev/charting/interfaces/datasets/IBarDataSet.kt
+++ b/chartLib/src/main/kotlin/info/appdev/charting/interfaces/datasets/IBarDataSet.kt
@@ -1,5 +1,6 @@
 package info.appdev.charting.interfaces.datasets
 
+import androidx.annotation.ColorInt
 import info.appdev.charting.data.BarEntry
 import info.appdev.charting.utils.Fill
 
diff --git a/chartLib/src/main/kotlin/info/appdev/charting/interfaces/datasets/IBarLineScatterCandleBubbleDataSet.kt b/chartLib/src/main/kotlin/info/appdev/charting/interfaces/datasets/IBarLineScatterCandleBubbleDataSet.kt
index c54774425..5246d8c10 100644
--- a/chartLib/src/main/kotlin/info/appdev/charting/interfaces/datasets/IBarLineScatterCandleBubbleDataSet.kt
+++ b/chartLib/src/main/kotlin/info/appdev/charting/interfaces/datasets/IBarLineScatterCandleBubbleDataSet.kt
@@ -1,5 +1,6 @@
 package info.appdev.charting.interfaces.datasets
 
+import androidx.annotation.ColorInt
 import info.appdev.charting.data.Entry
 
 interface IBarLineScatterCandleBubbleDataSet<T : Entry> : IDataSet<T> {
diff --git a/chartLib/src/main/kotlin/info/appdev/charting/interfaces/datasets/ICandleDataSet.kt b/chartLib/src/main/kotlin/info/appdev/charting/interfaces/datasets/ICandleDataSet.kt
index c4cf62b03..366c78344 100644
--- a/chartLib/src/main/kotlin/info/appdev/charting/interfaces/datasets/ICandleDataSet.kt
+++ b/chartLib/src/main/kotlin/info/appdev/charting/interfaces/datasets/ICandleDataSet.kt
@@ -1,6 +1,7 @@
 package info.appdev.charting.interfaces.datasets
 
 import android.graphics.Paint
+import androidx.annotation.ColorInt
 import info.appdev.charting.data.CandleEntry
 
 interface ICandleDataSet : ILineScatterCandleRadarDataSet<CandleEntry> {
diff --git a/chartLib/src/main/kotlin/info/appdev/charting/renderer/LineRadarRenderer.kt b/chartLib/src/main/kotlin/info/appdev/charting/renderer/LineRadarRenderer.kt
index e44d43aa4..802a632dc 100644
--- a/chartLib/src/main/kotlin/info/appdev/charting/renderer/LineRadarRenderer.kt
+++ b/chartLib/src/main/kotlin/info/appdev/charting/renderer/LineRadarRenderer.kt
@@ -4,6 +4,7 @@ import android.graphics.Canvas
 import android.graphics.Paint
 import android.graphics.Path
 import android.graphics.drawable.Drawable
+import androidx.annotation.ColorInt
 import androidx.core.graphics.withClip
 import info.appdev.charting.animation.ChartAnimator
 import info.appdev.charting.utils.ViewPortHandler
@@ -45,7 +46,7 @@ abstract class LineRadarRenderer(
      * @param fillColor
      * @param fillAlpha
      */
-    protected fun drawFilledPath(canvas: Canvas, filledPath: Path, fillColor: Int, fillAlpha: Int) {
+    protected fun drawFilledPath(canvas: Canvas, filledPath: Path, @ColorInt fillColor: Int, fillAlpha: Int) {
         val color = (fillAlpha shl 24) or (fillColor and 0xffffff)
 
         if (clipPathSupported()) {
diff --git a/chartLib/src/main/kotlin/info/appdev/charting/renderer/RadarChartRenderer.kt b/chartLib/src/main/kotlin/info/appdev/charting/renderer/RadarChartRenderer.kt
index 0a1b5c2c3..6304b084d 100644
--- a/chartLib/src/main/kotlin/info/appdev/charting/renderer/RadarChartRenderer.kt
+++ b/chartLib/src/main/kotlin/info/appdev/charting/renderer/RadarChartRenderer.kt
@@ -4,6 +4,7 @@ import android.graphics.Canvas
 import android.graphics.Color
 import android.graphics.Paint
 import android.graphics.Path
+import androidx.annotation.ColorInt
 import androidx.core.graphics.withSave
 import info.appdev.charting.animation.ChartAnimator
 import info.appdev.charting.charts.RadarChart
@@ -366,8 +367,8 @@ open class RadarChartRenderer(
         point: PointF,
         innerRadius: Float,
         outerRadius: Float,
-        fillColor: Int,
-        strokeColor: Int,
+        @ColorInt fillColor: Int,
+        @ColorInt strokeColor: Int,
         strokeWidth: Float
     ) {
         var innerRadiusLocal = innerRadius
diff --git a/chartLib/src/main/kotlin/info/appdev/charting/utils/Fill.kt b/chartLib/src/main/kotlin/info/appdev/charting/utils/Fill.kt
index eb8a124cc..b58d451cf 100644
--- a/chartLib/src/main/kotlin/info/appdev/charting/utils/Fill.kt
+++ b/chartLib/src/main/kotlin/info/appdev/charting/utils/Fill.kt
@@ -1,5 +1,7 @@
 package info.appdev.charting.utils
 
+import android.R.attr.endColor
+import android.R.attr.startColor
 import android.graphics.Canvas
 import android.graphics.LinearGradient
 import android.graphics.Paint
@@ -7,6 +9,7 @@ import android.graphics.Path
 import android.graphics.RectF
 import android.graphics.Shader
 import android.graphics.drawable.Drawable
+import androidx.annotation.ColorInt
 import kotlin.math.floor
 
 open class Fill {
@@ -26,8 +29,10 @@ open class Fill {
     /**
      * the color that is used for filling
      */
+    @ColorInt
     private var mColor: Int? = null
 
+    @ColorInt
     private var mFinalColor: Int? = null
 
     /**
@@ -44,7 +49,7 @@ open class Fill {
      */
     private var mAlpha = 255
 
-    constructor(startColor: Int, endColor: Int) {
+    constructor(@ColorInt startColor: Int, @ColorInt endColor: Int) {
         this.type = Type.LINEAR_GRADIENT
         this.gradientColors = intArrayOf(startColor, endColor)
     }
@@ -56,7 +61,7 @@ open class Fill {
             calculateFinalColor()
         }
 
-    fun setGradientColors(startColor: Int, endColor: Int) {
+    fun setGradientColors(@ColorInt startColor: Int, @ColorInt endColor: Int) {
         this.gradientColors = intArrayOf(startColor, endColor)
     }