create an interface for all fragments

app/src/main/kotlin/com/simplemobiletools/contacts/activities/MainActivity.kt

@@ -115,8 +115,8 @@ class MainActivity : SimpleActivity(), RefreshContactsListener {
         if (storedPrimaryColor != configPrimaryColor) {
             main_tabs_holder.setSelectedTabIndicatorColor(getAdjustedPrimaryColor())
             main_tabs_holder.getTabAt(viewpager.currentItem)?.icon?.applyColorFilter(getAdjustedPrimaryColor())
-            contacts_fragment?.primaryColorChanged()
+            contacts_fragment?.primaryColorChanged(configPrimaryColor)
-            favorites_fragment?.primaryColorChanged()
+            favorites_fragment?.primaryColorChanged(configPrimaryColor)
         }
 
         val configStartNameWithSurname = config.startNameWithSurname
@@ -130,9 +130,9 @@ class MainActivity : SimpleActivity(), RefreshContactsListener {
                 initFragments()
             }
 
-            contacts_fragment?.initContacts()
+            contacts_fragment?.refreshContacts()
             contacts_fragment?.onActivityResume()
-            favorites_fragment?.initContacts()
+            favorites_fragment?.refreshContacts()
             favorites_fragment?.onActivityResume()
         }
 
@@ -306,15 +306,15 @@ class MainActivity : SimpleActivity(), RefreshContactsListener {
 
     private fun showSortingDialog() {
         ChangeSortingDialog(this) {
-            contacts_fragment?.initContacts()
+            contacts_fragment?.refreshContacts()
-            favorites_fragment?.initContacts()
+            favorites_fragment?.refreshContacts()
         }
     }
 
     fun showFilterDialog() {
         FilterContactSourcesDialog(this) {
             contacts_fragment?.forceListRedraw = true
-            contacts_fragment?.initContacts()
+            contacts_fragment?.refreshContacts()
         }
     }
 
@@ -400,12 +400,12 @@ class MainActivity : SimpleActivity(), RefreshContactsListener {
     }
 
     override fun refreshContacts() {
-        contacts_fragment.initContacts()
+        contacts_fragment.refreshContacts()
-        favorites_fragment.initContacts()
+        favorites_fragment.refreshContacts()
     }
 
     override fun refreshFavorites() {
-        favorites_fragment?.initContacts()
+        favorites_fragment?.refreshContacts()
     }
 
     private fun checkWhatsNewDialog() {

app/src/main/kotlin/com/simplemobiletools/contacts/fragments/FavoritesFragment.kt

@@ -16,7 +16,7 @@ class FavoritesFragment(context: Context, attributeSet: AttributeSet) : MyViewPa
 
     private fun showAddFavoritesDialog() {
         AddFavoritesDialog(activity!!) {
-            initContacts()
+            refreshContacts()
         }
     }
 }

app/src/main/kotlin/com/simplemobiletools/contacts/fragments/GroupsFragment.kt

@@ -3,7 +3,19 @@ package com.simplemobiletools.contacts.fragments
 import android.content.Context
 import android.support.design.widget.CoordinatorLayout
 import android.util.AttributeSet
+import com.simplemobiletools.contacts.activities.MainActivity
+import com.simplemobiletools.contacts.interfaces.FragmentInterface
 
-class GroupsFragment(context: Context, attributeSet: AttributeSet) : CoordinatorLayout(context, attributeSet) {
+class GroupsFragment(context: Context, attributeSet: AttributeSet) : CoordinatorLayout(context, attributeSet), FragmentInterface {
+    override fun setupFragment(activity: MainActivity) {
+    }
 
+    override fun textColorChanged(color: Int) {
+    }
+
+    override fun primaryColorChanged(color: Int) {
+    }
+
+    override fun refreshContacts() {
+    }
 }

app/src/main/kotlin/com/simplemobiletools/contacts/fragments/MyViewPagerFragment.kt

@@ -16,10 +16,11 @@ import com.simplemobiletools.contacts.extensions.editContact
 import com.simplemobiletools.contacts.extensions.tryStartCall
 import com.simplemobiletools.contacts.extensions.viewContact
 import com.simplemobiletools.contacts.helpers.*
+import com.simplemobiletools.contacts.interfaces.FragmentInterface
 import com.simplemobiletools.contacts.models.Contact
 import kotlinx.android.synthetic.main.fragment_layout.view.*
 
-abstract class MyViewPagerFragment(context: Context, attributeSet: AttributeSet) : CoordinatorLayout(context, attributeSet) {
+abstract class MyViewPagerFragment(context: Context, attributeSet: AttributeSet) : CoordinatorLayout(context, attributeSet), FragmentInterface {
     protected var activity: MainActivity? = null
     private var lastHashCode = 0
     private var contactsIgnoringSearch = ArrayList<Contact>()
@@ -27,7 +28,7 @@ abstract class MyViewPagerFragment(context: Context, attributeSet: AttributeSet)
 
     var forceListRedraw = false
 
-    fun setupFragment(activity: MainActivity) {
+    override fun setupFragment(activity: MainActivity) {
         config = activity.config
         if (this.activity == null) {
             this.activity = activity
@@ -48,17 +49,17 @@ abstract class MyViewPagerFragment(context: Context, attributeSet: AttributeSet)
             }
         }
 
-        initContacts()
+        refreshContacts()
     }
 
-    fun textColorChanged(color: Int) {
+    override fun textColorChanged(color: Int) {
         (fragment_list.adapter as ContactsAdapter).apply {
             updateTextColor(color)
             initDrawables()
         }
     }
 
-    fun primaryColorChanged() {
+    override fun primaryColorChanged(color: Int) {
         fragment_fastscroller.updatePrimaryColor()
         fragment_fastscroller.updateBubblePrimaryColor()
     }
@@ -66,11 +67,11 @@ abstract class MyViewPagerFragment(context: Context, attributeSet: AttributeSet)
     fun startNameWithSurnameChanged(startNameWithSurname: Boolean) {
         (fragment_list.adapter as ContactsAdapter).apply {
             config.sorting = if (startNameWithSurname) SORT_BY_SURNAME else SORT_BY_FIRST_NAME
-            initContacts()
+            refreshContacts()
         }
     }
 
-    fun initContacts() {
+    override fun refreshContacts() {
         if (activity == null || activity!!.isActivityDestroyed()) {
             return
         }

app/src/main/kotlin/com/simplemobiletools/contacts/interfaces/FragmentInterface.kt

@@ -0,0 +1,13 @@
+package com.simplemobiletools.contacts.interfaces
+
+import com.simplemobiletools.contacts.activities.MainActivity
+
+interface FragmentInterface {
+    fun setupFragment(activity: MainActivity)
+
+    fun textColorChanged(color: Int)
+
+    fun primaryColorChanged(color: Int)
+
+    fun refreshContacts()
+}