adding some implementation of HeadlessSmsSendService

app/src/main/kotlin/com/simplemobiletools/smsmessenger/services/HeadlessSmsSendService.kt

@@ -2,10 +2,29 @@ package com.simplemobiletools.smsmessenger.services
 
 import android.app.Service
 import android.content.Intent
-import android.os.IBinder
+import com.klinker.android.send_message.Settings
+import com.klinker.android.send_message.Transaction
+import com.simplemobiletools.smsmessenger.extensions.getThreadId
 
 class HeadlessSmsSendService : Service() {
-    override fun onBind(intent: Intent?): IBinder? {
-        return null
+    override fun onBind(intent: Intent?) = null
+
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        try {
+            if (intent == null) {
+                return START_NOT_STICKY
+            }
+
+            val number = intent.dataString!!.removePrefix("sms:").removePrefix("smsto:").removePrefix("mms").removePrefix("mmsto:").trim()
+            val text = intent.getStringExtra(Intent.EXTRA_TEXT)
+            val settings = Settings()
+            settings.useSystemSending = true
+            val transaction = Transaction(this, settings)
+            val message = com.klinker.android.send_message.Message(text, number)
+            transaction.sendNewMessage(message, getThreadId(number))
+        } catch (ignored: Exception) {
+        }
+
+        return super.onStartCommand(intent, flags, startId)
     }
 }