adding a letters fastscroller at the contact selector dialog

app/src/main/kotlin/com/simplemobiletools/dialer/dialogs/SelectContactDialog.kt

@@ -1,21 +1,42 @@
 package com.simplemobiletools.dialer.dialogs
 
 import androidx.appcompat.app.AlertDialog
+import com.reddit.indicatorfastscroll.FastScrollItemIndicator
+import com.simplemobiletools.commons.extensions.getColorStateList
+import com.simplemobiletools.commons.extensions.getContrastColor
 import com.simplemobiletools.commons.extensions.setupDialogStuff
 import com.simplemobiletools.commons.models.SimpleContact
 import com.simplemobiletools.dialer.R
 import com.simplemobiletools.dialer.activities.SimpleActivity
 import com.simplemobiletools.dialer.adapters.ContactsAdapter
-import kotlinx.android.synthetic.main.layout_select_contact.view.*
+import com.simplemobiletools.dialer.extensions.config
+import kotlinx.android.synthetic.main.dialog_select_contact.view.*
+import java.util.*
 
-class SelectContactDialog(val activity: SimpleActivity, allContacts: ArrayList<SimpleContact>, val callback: (selectedContact: SimpleContact) -> Unit) {
+class SelectContactDialog(val activity: SimpleActivity, contacts: ArrayList<SimpleContact>, val callback: (selectedContact: SimpleContact) -> Unit) {
     private var dialog: AlertDialog? = null
-    private var view = activity.layoutInflater.inflate(R.layout.layout_select_contact, null)
+    private var view = activity.layoutInflater.inflate(R.layout.dialog_select_contact, null)
 
     init {
-        view.select_contact_list.adapter = ContactsAdapter(activity, allContacts, view.select_contact_list) {
+        view.apply {
-            callback(it as SimpleContact)
+            letter_fastscroller.textColor = context.config.textColor.getColorStateList()
-            dialog?.dismiss()
+            letter_fastscroller_thumb.setupWithFastScroller(letter_fastscroller)
+            letter_fastscroller_thumb.textColor = context.config.primaryColor.getContrastColor()
+
+            letter_fastscroller.setupWithRecyclerView(select_contact_list, { position ->
+                try {
+                    val name = contacts[position].name
+                    val character = if (name.isNotEmpty()) name.substring(0, 1) else ""
+                    FastScrollItemIndicator.Text(character.toUpperCase(Locale.getDefault()))
+                } catch (e: Exception) {
+                    FastScrollItemIndicator.Text("")
+                }
+            })
+
+            select_contact_list.adapter = ContactsAdapter(activity, contacts, select_contact_list) {
+                callback(it as SimpleContact)
+                dialog?.dismiss()
+            }
         }
 
         dialog = AlertDialog.Builder(activity)

app/src/main/res/layout/dialog_select_contact.xml

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/select_contact_holder"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content">
+
+    <com.simplemobiletools.commons.views.MyRecyclerView
+        android:id="@+id/select_contact_list"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:clipToPadding="false"
+        android:scrollbars="none"
+        app:layoutManager="com.simplemobiletools.commons.views.MyLinearLayoutManager" />
+
+    <com.reddit.indicatorfastscroll.FastScrollerView
+        android:id="@+id/letter_fastscroller"
+        android:layout_width="32dp"
+        android:layout_height="wrap_content"
+        android:layout_alignParentEnd="true"
+        android:paddingTop="@dimen/big_margin"
+        android:paddingBottom="@dimen/big_margin" />
+
+    <com.reddit.indicatorfastscroll.FastScrollerThumbView
+        android:id="@+id/letter_fastscroller_thumb"
+        android:layout_width="@dimen/fab_size"
+        android:layout_height="match_parent"
+        android:layout_alignTop="@+id/letter_fastscroller"
+        android:layout_alignBottom="@+id/letter_fastscroller"
+        android:layout_marginEnd="@dimen/activity_margin"
+        android:layout_toStartOf="@+id/letter_fastscroller" />
+
+</RelativeLayout>

app/src/main/res/layout/layout_select_contact.xml

@@ -1,16 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    android:id="@+id/select_contact_holder"
-    android:layout_width="match_parent"
-    android:layout_height="wrap_content">
-
-    <com.simplemobiletools.commons.views.MyRecyclerView
-        android:id="@+id/select_contact_list"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:clipToPadding="false"
-        android:scrollbars="none"
-        app:layoutManager="com.simplemobiletools.commons.views.MyLinearLayoutManager" />
-
-</RelativeLayout>