store selected favorites

app/src/main/kotlin/com/simplemobiletools/contacts/adapters/AddFavoritesAdapter.kt

@@ -20,7 +20,8 @@ import com.simplemobiletools.contacts.models.Contact
 import kotlinx.android.synthetic.main.item_add_favorite_with_number.view.*
 import java.util.*
 
-class AddFavoritesAdapter(val activity: SimpleActivity, val contacts: List<Contact>) : RecyclerView.Adapter<AddFavoritesAdapter.ViewHolder>() {
+class AddFavoritesAdapter(val activity: SimpleActivity, val contacts: List<Contact>, val selectedContacts: Set<String>)
+    : RecyclerView.Adapter<AddFavoritesAdapter.ViewHolder>() {
     private val itemViews = SparseArray<View>()
     private val selectedPositions = HashSet<Int>()
     private val config = activity.config
@@ -29,6 +30,14 @@ class AddFavoritesAdapter(val activity: SimpleActivity, val contacts: List<Conta
     private val startNameWithSurname = config.startNameWithSurname
     private val itemLayout = if (config.showPhoneNumbers) R.layout.item_add_favorite_with_number else R.layout.item_add_favorite_without_number
 
+    init {
+        contacts.forEachIndexed { index, contact ->
+            if (selectedContacts.contains(contact.id.toString())) {
+                selectedPositions.add(index)
+            }
+        }
+    }
+
     private fun toggleItemSelection(select: Boolean, pos: Int) {
         if (select) {
             if (itemViews[pos] != null) {

app/src/main/kotlin/com/simplemobiletools/contacts/dialogs/AddFavoritesDialog.kt

@@ -18,7 +18,7 @@ class AddFavoritesDialog(val activity: SimpleActivity, val callback: () -> Unit)
         ContactsHelper(activity).getContacts {
             Contact.sorting = activity.config.sorting
             it.sort()
-            view.add_favorites_list.adapter = AddFavoritesAdapter(activity, it)
+            view.add_favorites_list.adapter = AddFavoritesAdapter(activity, it, activity.config.favorites)
 
             activity.runOnUiThread {
                 dialog = AlertDialog.Builder(activity)
@@ -33,6 +33,10 @@ class AddFavoritesDialog(val activity: SimpleActivity, val callback: () -> Unit)
 
     private fun dialogConfirmed() {
         val selectedItems = (view.add_favorites_list.adapter as AddFavoritesAdapter).getSelectedItemsSet()
+        if (activity.config.favorites != selectedItems) {
+            activity.config.favorites = selectedItems
+            callback()
+        }
         dialog?.dismiss()
     }
 }

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

@@ -15,6 +15,8 @@ class FavoritesFragment(context: Context, attributeSet: AttributeSet) : MyViewPa
                 addNewFavorites()
             }
         }
+
+        initFavorites()
     }
 
     override fun textColorChanged(color: Int) {
@@ -29,9 +31,13 @@ class FavoritesFragment(context: Context, attributeSet: AttributeSet) : MyViewPa
     override fun onActivityResume() {
     }
 
+    private fun initFavorites() {
+
+    }
+
     private fun addNewFavorites() {
         AddFavoritesDialog(activity!!) {
-
+            initFavorites()
         }
     }
 }

app/src/main/kotlin/com/simplemobiletools/contacts/helpers/Config.kt

@@ -4,6 +4,7 @@ import android.content.Context
 import com.simplemobiletools.commons.helpers.BaseConfig
 import com.simplemobiletools.commons.helpers.SORTING
 import com.simplemobiletools.commons.helpers.SORT_BY_FIRST_NAME
+import java.util.*
 
 class Config(context: Context) : BaseConfig(context) {
     companion object {
@@ -39,4 +40,8 @@ class Config(context: Context) : BaseConfig(context) {
     var lastUsedViewPagerPage: Int
         get() = prefs.getInt(LAST_USED_VIEW_PAGER_PAGE, 0)
         set(lastUsedViewPagerPage) = prefs.edit().putInt(LAST_USED_VIEW_PAGER_PAGE, lastUsedViewPagerPage).apply()
+
+    var favorites: Set<String>
+        get() = prefs.getStringSet(FAVORITES, HashSet<String>())
+        set(favorites) = prefs.edit().remove(FAVORITES).putStringSet(FAVORITES, favorites).apply()
 }

app/src/main/kotlin/com/simplemobiletools/contacts/helpers/Constants.kt

@@ -7,6 +7,7 @@ val DISPLAY_CONTACT_SOURCES = "display_contact_sources"
 val START_NAME_WITH_SURNAME = "start_name_with_surname"
 val LAST_USED_CONTACT_SOURCE = "last_used_contact_source"
 val LAST_USED_VIEW_PAGER_PAGE = "last_used_view_pager_page"
+val FAVORITES = "favorites"
 
 val CONTACT_ID = "contact_id"