allow sending MMS, sadly it needs internet access

app/src/main/AndroidManifest.xml

@@ -11,6 +11,11 @@
     <uses-permission android:name="android.provider.Telephony.SMS_RECEIVED" />
     <uses-permission android:name="android.permission.WAKE_LOCK" />
 
+    <!-- Internet is needed and used at sending MMS only -->
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+
     <uses-permission android:name="android.permission.READ_CONTACTS" />
     <uses-permission
         android:name="android.permission.USE_FINGERPRINT"
@@ -107,6 +112,8 @@
             </intent-filter>
         </service>
 
+        <service android:name="com.android.mms.transaction.TransactionService"/>
+
         <receiver
             android:name=".receivers.SmsReceiver"
             android:permission="android.permission.BROADCAST_SMS">
@@ -126,6 +133,10 @@
             </intent-filter>
         </receiver>
 
+        <receiver
+            android:name=".receivers.MmsSentReceiver"
+            android:taskAffinity="com.klinker.android.messaging.MMS_SENT"/>
+
         <receiver
             android:name=".receivers.MmsReceiver"
             android:exported="true"

app/src/main/kotlin/com/simplemobiletools/smsmessenger/activities/ThreadActivity.kt

@@ -6,6 +6,7 @@ import android.content.Intent
 import android.graphics.drawable.Drawable
 import android.net.Uri
 import android.os.Bundle
+import android.provider.MediaStore
 import android.provider.Telephony
 import android.telephony.SmsManager
 import android.text.TextUtils
@@ -27,6 +28,8 @@ 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.klinker.android.send_message.Settings
+import com.klinker.android.send_message.Transaction
 import com.simplemobiletools.commons.dialogs.ConfirmationDialog
 import com.simplemobiletools.commons.extensions.*
 import com.simplemobiletools.commons.helpers.ensureBackgroundThread
@@ -154,22 +157,7 @@ class ThreadActivity : SimpleActivity() {
         thread_add_attachment.applyColorFilter(config.textColor)
 
         thread_send_message.setOnClickListener {
-            val msg = thread_type_message.value
-            if (msg.isEmpty()) {
-                return@setOnClickListener
-            }
-
-            participants.forEach {
-                val intent = Intent(this, SmsSentReceiver::class.java).apply {
-                    putExtra(MESSAGE_BODY, msg)
-                    putExtra(MESSAGE_ADDRESS, it.phoneNumber)
-                }
-
-                val pendingIntent = PendingIntent.getBroadcast(this, threadId, intent, PendingIntent.FLAG_UPDATE_CURRENT)
-                val smsManager = SmsManager.getDefault()
-                smsManager.sendTextMessage(it.phoneNumber, null, msg, pendingIntent, null)
-            }
-            thread_type_message.setText("")
+            sendMessage()
         }
 
         thread_send_message.isClickable = false
@@ -346,6 +334,36 @@ class ThreadActivity : SimpleActivity() {
         }
     }
 
+    private fun sendMessage() {
+        val msg = thread_type_message.value
+        if (msg.isEmpty()) {
+            return
+        }
+
+        participants.forEach {
+            if (attachmentUris.isEmpty()) {
+                val intent = Intent(this, SmsSentReceiver::class.java).apply {
+                    putExtra(MESSAGE_BODY, msg)
+                    putExtra(MESSAGE_ADDRESS, it.phoneNumber)
+                }
+
+                val pendingIntent = PendingIntent.getBroadcast(this, threadId, intent, PendingIntent.FLAG_UPDATE_CURRENT)
+                val smsManager = SmsManager.getDefault()
+                smsManager.sendTextMessage(it.phoneNumber, null, msg, pendingIntent, null)
+            } else {
+                val settings = Settings()
+                settings.useSystemSending = true
+                val transaction = Transaction(this, settings)
+                val message = com.klinker.android.send_message.Message(msg, it.phoneNumber)
+                val bitmap = MediaStore.Images.Media.getBitmap(contentResolver, attachmentUris.first())
+                message.setImage(bitmap)
+                transaction.sendNewMessage(message, threadId.toLong())
+            }
+        }
+
+        thread_type_message.setText("")
+    }
+
     // show selected contacts, properly split to new lines when appropriate
     // based on https://stackoverflow.com/a/13505029/1967672
     private fun showSelectedContact(views: ArrayList<View>) {

app/src/main/kotlin/com/simplemobiletools/smsmessenger/receivers/MmsSentReceiver.kt

@@ -0,0 +1,15 @@
+package com.simplemobiletools.smsmessenger.receivers
+
+import android.app.Activity
+import android.content.Context
+import android.content.Intent
+import com.simplemobiletools.smsmessenger.helpers.refreshMessages
+
+class MmsSentReceiver : com.klinker.android.send_message.MmsSentReceiver() {
+    override fun onMessageStatusUpdated(context: Context?, intent: Intent?, resultCode: Int) {
+        super.onMessageStatusUpdated(context, intent, resultCode)
+        if (resultCode == Activity.RESULT_OK) {
+            refreshMessages()
+        }
+    }
+}