Setup color programmatically when view created dynamically.

app/src/main/AndroidManifest.xml

@@ -13,13 +13,15 @@
       android:supportsRtl="true"
       android:theme="@style/AppTheme"
       >
-    <activity android:name=".MainActivity">
+    <activity android:name=".SampleActivity">
       <intent-filter>
         <action android:name="android.intent.action.MAIN"/>
 
         <category android:name="android.intent.category.LAUNCHER"/>
       </intent-filter>
     </activity>
+    <activity android:name=".MainActivity"/>
+    <activity android:name=".ProgrammaticallyActivity"/>
   </application>
 
 </manifest>

app/src/main/java/com/chahinem/pageindicator/sample/MainActivity.kt

@@ -1,5 +1,7 @@
 package com.chahinem.pageindicator.sample
 
+import android.content.Context
+import android.content.Intent
 import android.os.Bundle
 import androidx.appcompat.app.AppCompatActivity
 import androidx.recyclerview.widget.LinearSnapHelper
@@ -25,7 +27,7 @@ class MainActivity : AppCompatActivity() {
     val adapter = MyAdapter(picasso)
     list.adapter = adapter
     LinearSnapHelper().attachToRecyclerView(list)
-    adapter.swapData(LIST_ITEMS)
+    adapter.setItems(LIST_ITEMS)
     pageIndicator attachTo list
 
     // ViewPager
@@ -70,5 +72,10 @@ class MainActivity : AppCompatActivity() {
             "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod",
             "https://scontent-cdg2-1.cdninstagram.com/t51.2885-15/e35/23161047_853121148199404_5154039615094521856_n.jpg")
     )
+
+    fun start(context: Context) {
+      context.startActivity(
+          Intent(context, MainActivity::class.java))
+    }
   }
 }

app/src/main/java/com/chahinem/pageindicator/sample/MyAdapter.kt

@@ -24,7 +24,7 @@ class MyAdapter(private val picasso: Picasso) : RecyclerView.Adapter<MyViewHolde
     holder.bind(picasso, items[holder.adapterPosition])
   }
 
-  fun swapData(data: Iterable<MyItem>?) {
+  fun setItems(data: Iterable<MyItem>?) {
     items.clear()
     data?.let { items.addAll(data) }
     notifyDataSetChanged()

app/src/main/java/com/chahinem/pageindicator/sample/ProgrammaticallyActivity.kt

@@ -0,0 +1,113 @@
+package com.chahinem.pageindicator.sample
+
+import android.content.Context
+import android.content.Intent
+import android.graphics.Color
+import android.os.Bundle
+import android.view.Gravity
+import android.view.View
+import android.view.ViewGroup.LayoutParams
+import android.widget.LinearLayout
+import android.widget.LinearLayout.VERTICAL
+import androidx.appcompat.app.AppCompatActivity
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.PagerSnapHelper
+import androidx.recyclerview.widget.RecyclerView
+import com.chahinem.pageindicator.PageIndicator
+import com.chahinem.pageindicator.sample.MyAdapter.MyItem
+import com.squareup.picasso.Picasso.Builder
+
+class ProgrammaticallyActivity : AppCompatActivity() {
+
+  override fun onCreate(savedInstanceState: Bundle?) {
+    super.onCreate(savedInstanceState)
+    setContentView(createContent())
+  }
+
+  private fun createContent(): View {
+    val verticalContainer = createVerticalContainer()
+    val pageIndicator = createPageIndicator()
+    val recyclerView = createRecyclerView()
+    pageIndicator.attachTo(recyclerView)
+
+
+    verticalContainer.addView(recyclerView)
+    verticalContainer.addView(pageIndicator)
+
+    return verticalContainer
+  }
+
+  private fun createVerticalContainer(): LinearLayout =
+      LinearLayout(this).apply { orientation = VERTICAL }
+
+  private fun createPageIndicator(): PageIndicator =
+      PageIndicator(this)
+          .apply {
+            layoutParams =
+                LinearLayout
+                    .LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT)
+                    .apply { gravity = Gravity.CENTER_HORIZONTAL }
+            defaultColor = Color.parseColor("#C2DEFA")
+            selectedColor = Color.parseColor("#0075EB")
+          }
+
+  private fun createRecyclerView(): RecyclerView {
+    val recyclerView = RecyclerView(this)
+    val adapter = createAdapter()
+
+    val linearLayoutManager =
+        LinearLayoutManager(this, RecyclerView.HORIZONTAL, false)
+
+    recyclerView.setHasFixedSize(true)
+    recyclerView.layoutManager = linearLayoutManager
+    recyclerView.adapter = adapter
+
+    val snapHelper = PagerSnapHelper()
+    snapHelper.attachToRecyclerView(recyclerView)
+
+    return recyclerView
+  }
+
+  private fun createAdapter(): MyAdapter {
+    val picasso = Builder(this).build()
+    return MyAdapter(picasso).apply { setItems(LIST_ITEMS) }
+  }
+
+  companion object {
+    private val LIST_ITEMS = listOf(
+        MyItem(
+            "San Francisco, California",
+            "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod",
+            "https://scontent-cdg2-1.cdninstagram.com/t51.2885-15/e35/25024416_182774512460963_6661054269581426688_n.jpg"),
+        MyItem(
+            "Valensole",
+            "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod",
+            "https://scontent-cdg2-1.cdninstagram.com/t51.2885-15/e35/25022757_375109192929045_3153371362454667264_n.jpg"),
+        MyItem(
+            "Étretat",
+            "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod",
+            "https://scontent-cdg2-1.cdninstagram.com/t51.2885-15/e35/25005816_2020789231533395_4507938399037947904_n.jpg"),
+        MyItem(
+            "Tokyo, Japan",
+            "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod",
+            "https://scontent-cdg2-1.cdninstagram.com/t51.2885-15/e35/23421860_192904647945945_6319320906002857984_n.jpg"),
+        MyItem(
+            "Paris, France",
+            "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod",
+            "https://scontent-cdg2-1.cdninstagram.com/t51.2885-15/e35/23347334_633654673691303_8149777143685971968_n.jpg"),
+        MyItem(
+            "New York, New York",
+            "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod",
+            "https://scontent-cdg2-1.cdninstagram.com/t51.2885-15/e35/23101824_1822687121355425_8930059065124454400_n.jpg"),
+        MyItem(
+            "New York, New York",
+            "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod",
+            "https://scontent-cdg2-1.cdninstagram.com/t51.2885-15/e35/23161047_853121148199404_5154039615094521856_n.jpg")
+    )
+
+    fun start(context: Context) {
+      context.startActivity(
+          Intent(context, ProgrammaticallyActivity::class.java))
+    }
+  }
+}

app/src/main/java/com/chahinem/pageindicator/sample/SampleActivity.kt

@@ -0,0 +1,47 @@
+package com.chahinem.pageindicator.sample
+
+import android.os.Bundle
+import android.view.View
+import android.widget.Button
+import android.widget.LinearLayout
+import androidx.appcompat.app.AppCompatActivity
+
+class SampleActivity : AppCompatActivity() {
+
+  override fun onCreate(savedInstanceState: Bundle?) {
+    super.onCreate(savedInstanceState)
+    setContentView(createContentView())
+  }
+
+  private fun createContentView(): View {
+    val container = createVerticalContainer()
+    BUTTONS.map { title ->
+      container.addView(createButton(title))
+    }
+    return container
+  }
+
+  private fun createButton(title: String): View =
+      Button(this).apply {
+        text = title
+        setOnClickListener {
+          handleClick((it as Button).text.toString())
+        }
+      }
+
+  private fun handleClick(text: String) {
+    when (text) {
+      LAYOUT_PROGRAMMATICALLY -> ProgrammaticallyActivity.start(this)
+      else -> MainActivity.start(this)
+    }
+  }
+
+  private fun createVerticalContainer(): LinearLayout =
+      LinearLayout(this).apply { orientation = LinearLayout.VERTICAL }
+
+  companion object {
+    private const val LAYOUT_FROM_XML = "LAYOUT FROM XML"
+    private const val LAYOUT_PROGRAMMATICALLY = "LAYOUT PROGRAMMATICALLY"
+    private val BUTTONS = listOf(LAYOUT_FROM_XML, LAYOUT_PROGRAMMATICALLY)
+  }
+}

dependencies.gradle

@@ -3,7 +3,7 @@ ext {
   minSdkVersion = 14
   compileSdkVersion = 28
   targetSdkVersion = 28
-  gradleVersion = '3.2.1'
+  gradleVersion = '3.3.2'
   kotlinVersion = '1.3.20'
 
   supportLibraryVersion = '27.1.1'

pageindicator/src/main/java/com/chahinem/pageindicator/PageIndicator.kt

@@ -24,10 +24,23 @@ class PageIndicator @JvmOverloads constructor(
 
   private lateinit var dotSizes: IntArray
   private lateinit var dotAnimators: Array<ValueAnimator>
-
   private val defaultPaint = Paint().apply { isAntiAlias = true }
   private val selectedPaint = Paint().apply { isAntiAlias = true }
 
+  var defaultColor: Int = ContextCompat.getColor(getContext(), R.color.pi_default_color)
+    set(value) {
+      field = value
+      defaultPaint.apply { color = value }
+      invalidate()
+    }
+
+  var selectedColor: Int = ContextCompat.getColor(getContext(), R.color.pi_selected_color)
+    set(value) {
+      field = value
+      selectedPaint.apply { color = value }
+      invalidate()
+    }
+
   private val dotSize: Int
   private val dotSizeMap: Map<Byte, Int>
   private val dotBound: Int
@@ -81,11 +94,9 @@ class PageIndicator @JvmOverloads constructor(
     animDuration = ta.getInteger(
         R.styleable.PageIndicator_piAnimDuration, DEFAULT_ANIM_DURATION).toLong()
     defaultPaint.color = ta.getColor(
-        R.styleable.PageIndicator_piDefaultColor,
-        ContextCompat.getColor(getContext(), R.color.pi_default_color))
+        R.styleable.PageIndicator_piDefaultColor, defaultColor)
     selectedPaint.color = ta.getColor(
-        R.styleable.PageIndicator_piSelectedColor,
-        ContextCompat.getColor(getContext(), R.color.pi_selected_color))
+        R.styleable.PageIndicator_piSelectedColor, selectedColor)
     animInterpolator = AnimationUtils.loadInterpolator(context, ta.getResourceId(
         R.styleable.PageIndicator_piAnimInterpolator,
         R.anim.pi_default_interpolator))