Rewrite, move SMS related code into the app

app/src/main/kotlin/com/simplemobiletools/smsmessenger/messaging/SendStatusReceiver.kt

@@ -0,0 +1,33 @@
+package com.simplemobiletools.smsmessenger.messaging
+
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import com.simplemobiletools.commons.helpers.ensureBackgroundThread
+
+abstract class SendStatusReceiver : BroadcastReceiver() {
+    // Updates the status of the message in the internal database
+    abstract fun updateAndroidDatabase(context: Context, intent: Intent, receiverResultCode: Int)
+
+    // allows the implementer to update the status of the message in their database
+    abstract fun updateAppDatabase(context: Context, intent: Intent, receiverResultCode: Int)
+
+    override fun onReceive(context: Context, intent: Intent) {
+        val resultCode = resultCode
+        ensureBackgroundThread {
+            updateAndroidDatabase(context, intent, resultCode)
+            updateAppDatabase(context, intent, resultCode)
+        }
+    }
+
+    companion object {
+        const val MESSAGE_SENT_ACTION = "com.simplemobiletools.smsmessenger.receiver.SendStatusReceiver.MESSAGE_SENT"
+        const val MESSAGE_DELIVERED_ACTION = "com.simplemobiletools.smsmessenger.receiver.SendStatusReceiver.MESSAGE_DELIVERED"
+
+        // Defined by platform, but no constant provided. See docs for SmsManager.sendTextMessage.
+        const val EXTRA_ERROR_CODE = "errorCode"
+        const val EXTRA_SUB_ID = "subId"
+
+        const val NO_ERROR_CODE = -1
+    }
+}