Sends SMS directly on Android

Addresses issue #57

.vscode/launch.json

@@ -5,7 +5,7 @@
     "version": "0.2.0",
     "configurations": [
         {
-            "name": "Flutter",
+            "name": "Example App",
             "request": "launch",
             "type": "dart",
             "program": "example/lib/main.dart"

README.md

@@ -56,6 +56,19 @@ List<String> recipents = ["1234567890", "5556787676"];
 _sendSMS(message, recipents);
 ```
 
+On Android, you can skip the additional dialog with the sendDirect parameter.
+
+``` dart
+String message = "This is a test message!";
+List<String> recipents = ["1234567890", "5556787676"];
+
+ String _result = await sendSMS(message: message, recipients: recipents, sendDirect: true)
+        .catchError((onError) {
+      print(onError);
+    });
+print(_result);
+```
+
 ## Screenshots
 
 iOS SMS             |  Android MMS

android/src/main/kotlin/com/example/flutter_sms/FlutterSmsPlugin.kt

@@ -1,21 +1,25 @@
 package com.example.flutter_sms
 
 import android.annotation.TargetApi
-import io.flutter.plugin.common.MethodCall
-import io.flutter.plugin.common.MethodChannel
-import io.flutter.plugin.common.MethodChannel.MethodCallHandler
-import io.flutter.plugin.common.MethodChannel.Result
-import io.flutter.plugin.common.PluginRegistry.Registrar
 import android.app.Activity
-import android.net.Uri
+import android.app.PendingIntent
 import android.content.Intent
 import android.content.pm.PackageManager
+import android.net.Uri
 import android.os.Build
+import android.telephony.SmsManager
+import android.util.Log
 import androidx.annotation.NonNull
 import io.flutter.embedding.engine.plugins.FlutterPlugin
 import io.flutter.embedding.engine.plugins.activity.ActivityAware
 import io.flutter.embedding.engine.plugins.activity.ActivityPluginBinding
 import io.flutter.plugin.common.BinaryMessenger
+import io.flutter.plugin.common.MethodCall
+import io.flutter.plugin.common.MethodChannel
+import io.flutter.plugin.common.MethodChannel.MethodCallHandler
+import io.flutter.plugin.common.MethodChannel.Result
+import io.flutter.plugin.common.PluginRegistry.Registrar
+
 
 class FlutterSmsPlugin: FlutterPlugin, MethodCallHandler, ActivityAware {
   private lateinit var mChannel: MethodChannel
@@ -76,9 +80,10 @@ class FlutterSmsPlugin: FlutterPlugin, MethodCallHandler, ActivityAware {
                     "A device may be unable to send messages if it does not support messaging or if it is not currently configured to send messages. This only applies to the ability to send text messages via iMessage, SMS, and MMS.")
             return
           }
-          val message = call.argument<String?>("message")
+          val message = call.argument<String?>("message") ?: ""
-          val recipients = call.argument<String?>("recipients")
+          val recipients = call.argument<String?>("recipients") ?: ""
-          sendSMS(result, recipients, message!!)
+          val sendDirect = call.argument<Boolean?>("sendDirect") ?: false
+          sendSMS(result, recipients, message!!, sendDirect)
         }
         "canSendSMS" -> result.success(canSendSMS())
         else -> result.notImplemented()
@@ -95,7 +100,35 @@ class FlutterSmsPlugin: FlutterPlugin, MethodCallHandler, ActivityAware {
     return !(activityInfo == null || !activityInfo.exported)
   }
 
-  private fun sendSMS(result: Result, phones: String?, message: String?) {
+  private fun sendSMS(result: Result, phones: String, message: String, sendDirect: Boolean) {
+    if (sendDirect) {
+      sendSMSDirect(result, phones, message);
+    }
+    else {
+      sendSMSDialog(result, phones, message);
+    }
+  }
+
+  private fun sendSMSDirect(result: Result, phones: String, message: String) {
+    // SmsManager is android.telephony
+    val sentIntent = PendingIntent.getBroadcast(activity, 0, Intent("SMS_SENT_ACTION"), PendingIntent.FLAG_IMMUTABLE)
+    val mSmsManager = SmsManager.getDefault()
+    val numbers = phones.split(";")
+
+    for (num in numbers) {
+      Log.d("Flutter SMS", "msg.length() : " + message.toByteArray().size)
+      if (message.toByteArray().size > 80) {
+        val partMessage = mSmsManager.divideMessage(message)
+        mSmsManager.sendMultipartTextMessage(num, null, partMessage, null, null)
+      } else {
+        mSmsManager.sendTextMessage(num, null, message, sentIntent, null)
+      }
+    }
+
+    result.success("SMS Sent!")
+  }
+
+  private fun sendSMSDialog(result: Result, phones: String, message: String) {
     val intent = Intent(Intent.ACTION_SENDTO)
     intent.data = Uri.parse("smsto:$phones")
     intent.putExtra("sms_body", message)

example/.flutter-plugins-dependencies

@@ -1 +1 @@
-{"info":"This is a generated file; do not edit or check into version control.","plugins":{"ios":[{"name":"flutter_sms","path":"/Users/rodydavis/Developer/GitHub/plugins/packages/flutter_sms/","dependencies":["url_launcher"]},{"name":"url_launcher","path":"/usr/local/Caskroom/flutter/1.2.1/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher-6.0.12/","dependencies":[]}],"android":[{"name":"flutter_sms","path":"/Users/rodydavis/Developer/GitHub/plugins/packages/flutter_sms/","dependencies":["url_launcher"]},{"name":"url_launcher","path":"/usr/local/Caskroom/flutter/1.2.1/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher-6.0.12/","dependencies":[]}],"macos":[{"name":"url_launcher_macos","path":"/usr/local/Caskroom/flutter/1.2.1/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher_macos-2.0.2/","dependencies":[]}],"linux":[{"name":"url_launcher_linux","path":"/usr/local/Caskroom/flutter/1.2.1/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher_linux-2.0.2/","dependencies":[]}],"windows":[{"name":"url_launcher_windows","path":"/usr/local/Caskroom/flutter/1.2.1/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher_windows-2.0.2/","dependencies":[]}],"web":[{"name":"flutter_sms","path":"/Users/rodydavis/Developer/GitHub/plugins/packages/flutter_sms/","dependencies":[]},{"name":"url_launcher_web","path":"/usr/local/Caskroom/flutter/1.2.1/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher_web-2.0.4/","dependencies":[]}]},"dependencyGraph":[{"name":"flutter_sms","dependencies":["url_launcher"]},{"name":"url_launcher","dependencies":["url_launcher_linux","url_launcher_macos","url_launcher_web","url_launcher_windows"]},{"name":"url_launcher_linux","dependencies":[]},{"name":"url_launcher_macos","dependencies":[]},{"name":"url_launcher_web","dependencies":[]},{"name":"url_launcher_windows","dependencies":[]}],"date_created":"2021-09-27 10:56:42.626795","version":"2.5.1"}
+{"info":"This is a generated file; do not edit or check into version control.","plugins":{"ios":[{"name":"flutter_sms","path":"/Users/dsilk/Development/flutter/packages/flutter_sms/","dependencies":[]},{"name":"url_launcher_ios","path":"/Users/dsilk/.pub-cache/hosted/pub.dartlang.org/url_launcher_ios-6.0.15/","dependencies":[]}],"android":[{"name":"flutter_sms","path":"/Users/dsilk/Development/flutter/packages/flutter_sms/","dependencies":[]},{"name":"url_launcher_android","path":"/Users/dsilk/.pub-cache/hosted/pub.dartlang.org/url_launcher_android-6.0.15/","dependencies":[]}],"macos":[{"name":"url_launcher_macos","path":"/Users/dsilk/.pub-cache/hosted/pub.dartlang.org/url_launcher_macos-3.0.0/","dependencies":[]}],"linux":[{"name":"url_launcher_linux","path":"/Users/dsilk/.pub-cache/hosted/pub.dartlang.org/url_launcher_linux-3.0.0/","dependencies":[]}],"windows":[{"name":"url_launcher_windows","path":"/Users/dsilk/.pub-cache/hosted/pub.dartlang.org/url_launcher_windows-3.0.0/","dependencies":[]}],"web":[{"name":"flutter_sms","path":"/Users/dsilk/Development/flutter/packages/flutter_sms/","dependencies":[]},{"name":"url_launcher_web","path":"/Users/dsilk/.pub-cache/hosted/pub.dartlang.org/url_launcher_web-2.0.8/","dependencies":[]}]},"dependencyGraph":[{"name":"flutter_sms","dependencies":["url_launcher"]},{"name":"url_launcher","dependencies":["url_launcher_android","url_launcher_ios","url_launcher_linux","url_launcher_macos","url_launcher_web","url_launcher_windows"]},{"name":"url_launcher_android","dependencies":[]},{"name":"url_launcher_ios","dependencies":[]},{"name":"url_launcher_linux","dependencies":[]},{"name":"url_launcher_macos","dependencies":[]},{"name":"url_launcher_web","dependencies":[]},{"name":"url_launcher_windows","dependencies":[]}],"date_created":"2022-02-14 16:50:47.982162","version":"2.10.1"}

example/android/app/src/main/AndroidManifest.xml

@@ -5,8 +5,11 @@
          In most cases you can leave this as-is, but you if you want to provide
          additional functionality it is fine to subclass or reimplement
          FlutterApplication and put your custom class here. -->
+
+    <uses-permission android:name="android.permission.SEND_SMS"/>
+    
     <application
-        android:name="io.flutter.app.FlutterApplication"
+        android:name="${applicationName}"
         android:label="example"
         android:icon="@mipmap/ic_launcher">
         <activity
@@ -15,6 +18,7 @@
             android:theme="@style/LaunchTheme"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
             android:hardwareAccelerated="true"
+            android:exported="true"
             android:windowSoftInputMode="adjustResize">
             <!-- Specifies an Android theme to apply to this Activity as soon as
                  the Android process has started. This theme is visible to the user

example/android/build.gradle

@@ -1,5 +1,5 @@
 buildscript {
-    ext.kotlin_version = '1.3.50'
+    ext.kotlin_version = '1.6.10'
     repositories {
         google()
         jcenter()

example/lib/main.dart

@@ -15,6 +15,7 @@ class _MyAppState extends State<MyApp> {
   String? _message, body;
   String _canSendSMSMessage = 'Check is not run.';
   List<String> people = [];
+  bool sendDirect = false;
 
   @override
   void initState() {
@@ -30,7 +31,10 @@ class _MyAppState extends State<MyApp> {
   Future<void> _sendSMS(List<String> recipients) async {
     try {
       String _result = await sendSMS(
-          message: _controllerMessage.text, recipients: recipients);
+        message: _controllerMessage.text,
+        recipients: recipients,
+        sendDirect: sendDirect,
+      );
       setState(() => _message = _result);
     } catch (error) {
       setState(() => _message = error.toString());
@@ -89,7 +93,7 @@ class _MyAppState extends State<MyApp> {
         ),
         body: ListView(
           children: <Widget>[
-            if (people == null || people.isEmpty)
+            if (people.isEmpty)
               const SizedBox(height: 0)
             else
               SizedBox(
@@ -144,12 +148,21 @@ class _MyAppState extends State<MyApp> {
                 },
               ),
             ),
+            SwitchListTile(
+                title: const Text('Send Direct'),
+                subtitle: const Text('Should we skip the additional dialog?'),
+                value: sendDirect,
+                onChanged: (bool newValue) {
+                  setState(() {
+                    sendDirect = newValue;
+                  });
+                }),
             Padding(
               padding: const EdgeInsets.all(8),
               child: ElevatedButton(
                 style: ButtonStyle(
                   backgroundColor: MaterialStateProperty.resolveWith(
-                      (states) => Theme.of(context).accentColor),
+                      (states) => Theme.of(context).colorScheme.secondary),
                   padding: MaterialStateProperty.resolveWith(
                       (states) => const EdgeInsets.symmetric(vertical: 16)),
                 ),
@@ -158,7 +171,7 @@ class _MyAppState extends State<MyApp> {
                 },
                 child: Text(
                   'SEND',
-                  style: Theme.of(context).accentTextTheme.button,
+                  style: Theme.of(context).textTheme.displayMedium,
                 ),
               ),
             ),

lib/flutter_sms.dart

@@ -1,16 +1,18 @@
 import 'dart:async';
 
-import 'package:flutter/foundation.dart';
-
 import 'src/flutter_sms_platform.dart';
 
 /// Open SMS Dialog on iOS/Android/Web
 Future<String> sendSMS({
   required String message,
   required List<String> recipients,
+  required bool sendDirect,
 }) =>
-    FlutterSmsPlatform.instance
+    FlutterSmsPlatform.instance.sendSMS(
-        .sendSMS(message: message, recipients: recipients);
+      message: message,
+      recipients: recipients,
+      sendDirect: sendDirect,
+    );
 
 /// Launch SMS Url Scheme on all platforms
 Future<bool> launchSms({

lib/flutter_sms_web.dart

@@ -15,6 +15,7 @@ class FlutterSmsPlugin extends FlutterSmsPlatform {
   Future<String> sendSMS({
     required String message,
     required List<String> recipients,
+    bool sendDirect = false,
   }) async {
     bool _messageSent =
         await FlutterSmsPlatform.instance.launchSmsMulti(recipients, message);

lib/src/flutter_sms_platform.dart

@@ -32,9 +32,12 @@ class FlutterSmsPlatform extends PlatformInterface {
     _instance = instance;
   }
 
+  ///
+  ///
   Future<String> sendSMS({
     required String message,
     required List<String> recipients,
+    required bool sendDirect,
   }) {
     final mapData = <dynamic, dynamic>{};
     mapData['message'] = message;
@@ -46,6 +49,7 @@ class FlutterSmsPlatform extends PlatformInterface {
     } else {
       String _phones = recipients.join(';');
       mapData['recipients'] = _phones;
+      mapData['sendDirect'] = sendDirect;
       return _channel
           .invokeMethod<String>('sendSMS', mapData)
           .then((value) => value ?? 'Error sending sms');