implement contact deletion

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

@@ -14,6 +14,7 @@ import com.bumptech.glide.load.resource.drawable.DrawableTransitionOptions
 import com.bumptech.glide.request.RequestListener
 import com.bumptech.glide.request.RequestOptions
 import com.bumptech.glide.request.target.Target
+import com.simplemobiletools.commons.dialogs.ConfirmationDialog
 import com.simplemobiletools.commons.extensions.*
 import com.simplemobiletools.commons.helpers.PERMISSION_READ_CONTACTS
 import com.simplemobiletools.commons.helpers.PERMISSION_WRITE_CONTACTS
@@ -163,7 +164,10 @@ class ContactActivity : SimpleActivity() {
     }
 
     private fun deleteContact() {
-
+        ConfirmationDialog(this) {
+            ContactsHelper(this).deleteContact(contact!!)
+            finish()
+        }
     }
 
     private fun showAccountSourcePicker() {

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

@@ -87,6 +87,7 @@ class MainActivity : SimpleActivity(), RefreshRecyclerViewListener {
         contacts_placeholder_2.setOnClickListener {
             showFilterDialog()
         }
+        initContacts()
     }
 
     override fun onPause() {
@@ -140,11 +141,14 @@ class MainActivity : SimpleActivity(), RefreshRecyclerViewListener {
         ContactsHelper(this).getContacts {
             Contact.sorting = config.sorting
             it.sort()
+
+            if (it.hashCode() != (contacts_list.adapter as? ContactsAdapter)?.contactItems?.hashCode()) {
                 runOnUiThread {
                     setupContacts(it)
                 }
             }
         }
+    }
 
     private fun setupContacts(contacts: ArrayList<Contact>) {
         contacts_placeholder_2.beVisibleIf(contacts.isEmpty())

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

@@ -18,6 +18,7 @@ import com.simplemobiletools.contacts.R
 import com.simplemobiletools.contacts.activities.SimpleActivity
 import com.simplemobiletools.contacts.extensions.config
 import com.simplemobiletools.contacts.extensions.openContact
+import com.simplemobiletools.contacts.helpers.ContactsHelper
 import com.simplemobiletools.contacts.models.Contact
 import kotlinx.android.synthetic.main.item_contact.view.*
 
@@ -91,7 +92,14 @@ class ContactsAdapter(activity: SimpleActivity, var contactItems: MutableList<Co
     }
 
     private fun deleteContacts() {
+        if (selectedPositions.isEmpty()) {
+            return
+        }
 
+        val contacts = ArrayList<Contact>()
+        selectedPositions.forEach { contacts.add(contactItems[it]) }
+        ContactsHelper(activity).deleteContacts(contacts)
+        removeSelectedItems()
     }
 
     override fun onViewRecycled(holder: ViewHolder?) {

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

@@ -1,7 +1,9 @@
 package com.simplemobiletools.contacts.helpers
 
+import android.content.ContentProviderOperation
 import android.database.Cursor
 import android.provider.ContactsContract
+import com.simplemobiletools.commons.activities.BaseSimpleActivity
 import com.simplemobiletools.commons.extensions.getIntValue
 import com.simplemobiletools.commons.extensions.getStringValue
 import com.simplemobiletools.commons.extensions.showErrorToast
@@ -9,13 +11,12 @@ import com.simplemobiletools.commons.helpers.SORT_BY_FIRST_NAME
 import com.simplemobiletools.commons.helpers.SORT_BY_MIDDLE_NAME
 import com.simplemobiletools.commons.helpers.SORT_BY_SURNAME
 import com.simplemobiletools.commons.helpers.SORT_DESCENDING
-import com.simplemobiletools.contacts.activities.SimpleActivity
 import com.simplemobiletools.contacts.extensions.config
 import com.simplemobiletools.contacts.models.Contact
 import com.simplemobiletools.contacts.overloads.times
 import java.util.*
 
-class ContactsHelper(val activity: SimpleActivity) {
+class ContactsHelper(val activity: BaseSimpleActivity) {
     fun getContactSources(callback: (ArrayList<String>) -> Unit) {
         val accounts = HashSet<String>()
         Thread {
@@ -242,4 +243,20 @@ class ContactsHelper(val activity: SimpleActivity) {
         }
         return sort
     }
+
+    fun deleteContact(contact: Contact) = deleteContacts(arrayListOf(contact))
+
+    fun deleteContacts(contacts: ArrayList<Contact>) {
+        try {
+            val operations = ArrayList<ContentProviderOperation>()
+            val selection = "${ContactsContract.CommonDataKinds.Phone.CONTACT_ID} = ?"
+            contacts.forEach {
+                val selectionArgs = arrayOf(it.id.toString())
+                operations.add(ContentProviderOperation.newDelete(ContactsContract.RawContacts.CONTENT_URI).withSelection(selection, selectionArgs).build())
+            }
+            activity.contentResolver.applyBatch(ContactsContract.AUTHORITY, operations)
+        } catch (e: Exception) {
+            activity.showErrorToast(e)
+        }
+    }
 }