Remove firstName and lastName from contact interface,

move some implementations from AndroidContact to Contact interface

data/contacts/src/main/java/de/mm20/launcher2/contacts/AndroidContact.kt

@@ -10,7 +10,6 @@ import de.mm20.launcher2.icons.ColorLayer
 import de.mm20.launcher2.icons.LauncherIcon
 import de.mm20.launcher2.icons.StaticIconLayer
 import de.mm20.launcher2.icons.StaticLauncherIcon
-import de.mm20.launcher2.icons.TextLayer
 import de.mm20.launcher2.ktx.asBitmap
 import de.mm20.launcher2.ktx.tryStartActivity
 import de.mm20.launcher2.search.Contact
@@ -24,9 +23,7 @@ import kotlinx.coroutines.withContext
 
 internal data class AndroidContact(
     internal val id: Long,
-    override val firstName: String,
-    override val lastName: String,
-    override val displayName: String,
+    override val name: String,
     override val phoneNumbers: List<PhoneNumber>,
     override val emailAddresses: List<EmailAddress>,
     override val postalAddresses: List<PostalAddress>,
@@ -39,8 +36,7 @@ internal data class AndroidContact(
     override val domain: String = Domain
     override val key: String
         get() = "$Domain://$id"
-    override val label: String
-        get() = displayName.takeIf { it.isNotBlank() } ?: "$firstName $lastName"
+    override val label: String = name
 
     override val summary: String
         get() {
@@ -58,16 +54,6 @@ internal data class AndroidContact(
         return context.tryStartActivity(intent, options)
     }
 
-    override fun getPlaceholderIcon(context: Context): StaticLauncherIcon {
-        val iconText =
-            if (firstName.isNotEmpty()) firstName[0].toString() else "" + if (lastName.isNotEmpty()) lastName[0].toString() else ""
-
-        return StaticLauncherIcon(
-            foregroundLayer = TextLayer(text = iconText, color = 0xFF2364AA.toInt()),
-            backgroundLayer = ColorLayer(0xFF2364AA.toInt())
-        )
-    }
-
     override suspend fun loadIcon(
         context: Context,
         size: Int,

data/contacts/src/main/java/de/mm20/launcher2/contacts/ContactRepository.kt

@@ -65,9 +65,9 @@ internal class ContactRepository(
                 ContactsContract.Data.CONTENT_URI,
                 null, s, null, null
             ) ?: return@withContext null
-            var firstName = ""
-            var lastName = ""
-            var displayName = ""
+            var firstName: String? = null
+            var lastName: String? = null
+            var displayName: String? = null
             val phoneNumbers = mutableListOf<PhoneNumber>()
             val emailAddresses = mutableListOf<EmailAddress>()
             val postalAddresses = mutableListOf<PostalAddress>()
@@ -133,9 +133,9 @@ internal class ContactRepository(
                         }
 
                     ContactsContract.CommonDataKinds.StructuredName.CONTENT_ITEM_TYPE -> {
-                        firstName = dataCursor.getStringOrNull(givenNameColumn) ?: ""
-                        lastName = dataCursor.getStringOrNull(familyNameColumn) ?: ""
-                        displayName = dataCursor.getStringOrNull(displayNameColumn) ?: ""
+                        firstName = dataCursor.getStringOrNull(givenNameColumn)
+                        lastName = dataCursor.getStringOrNull(familyNameColumn)
+                        displayName = dataCursor.getStringOrNull(displayNameColumn)
                     }
 
                     else -> {
@@ -170,9 +170,9 @@ internal class ContactRepository(
 
             return@withContext AndroidContact(
                 id = id,
-                firstName = firstName,
-                lastName = lastName,
-                displayName = displayName,
+                name = displayName
+                    ?: listOfNotNull(firstName, lastName).joinToString(" ").takeIf { it.isNotBlank() }
+                            ?: return@withContext null,
                 phoneNumbers = phoneNumbers.sortedByDescending {
                     it.number.count { !PhoneNumberUtils.isReallyDialable(it) }
                 }.map {