do not allow using the app, if it isnt the default SMS handler

app/src/main/AndroidManifest.xml

@@ -3,7 +3,14 @@
     xmlns:tools="http://schemas.android.com/tools"
     package="com.simplemobiletools.smsmessenger">
 
+    <uses-permission android:name="android.permission.SEND_SMS" />
+    <uses-permission android:name="android.permission.RECEIVE_SMS" />
     <uses-permission android:name="android.permission.READ_SMS" />
+    <uses-permission android:name="android.permission.WRITE_SMS" />
+    <uses-permission android:name="android.permission.RECEIVE_MMS" />
+    <uses-permission android:name="android.permission.RECEIVE_WAP_PUSH" />
+    <uses-permission android:name="android.provider.Telephony.SMS_RECEIVED" />
+
     <uses-permission android:name="android.permission.READ_CONTACTS" />
     <uses-permission
         android:name="android.permission.USE_FINGERPRINT"
@@ -35,6 +42,21 @@
             android:name=".activities.ThreadActivity"
             android:parentActivityName=".activities.MainActivity" />
 
+        <activity android:name=".activities.NewMessageActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.SEND" />
+                <action android:name="android.intent.action.SENDTO" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+
+                <data android:scheme="sms" />
+                <data android:scheme="smsto" />
+                <data android:scheme="mms" />
+                <data android:scheme="mmsto" />
+            </intent-filter>
+        </activity>
+
         <activity
             android:name=".activities.SettingsActivity"
             android:label="@string/settings"
@@ -59,5 +81,37 @@
             android:name="com.simplemobiletools.commons.activities.FAQActivity"
             android:label="@string/frequently_asked_questions"
             android:parentActivityName="com.simplemobiletools.commons.activities.AboutActivity" />
+
+        <service
+            android:name=".services.HeadlessSmsSendService"
+            android:exported="true"
+            android:permission="android.permission.SEND_RESPOND_VIA_MESSAGE">
+            <intent-filter>
+                <action android:name="android.intent.action.RESPOND_VIA_MESSAGE" />
+                <category android:name="android.intent.category.DEFAULT" />
+
+                <data android:scheme="sms" />
+                <data android:scheme="smsto" />
+                <data android:scheme="mms" />
+                <data android:scheme="mmsto" />
+            </intent-filter>
+        </service>
+
+        <receiver
+            android:name=".receivers.SmsReceiver"
+            android:permission="android.permission.BROADCAST_SMS">
+            <intent-filter>
+                <action android:name="android.provider.Telephony.SMS_DELIVER" />
+            </intent-filter>
+        </receiver>
+
+        <receiver
+            android:name=".receivers.MmsReceiver"
+            android:permission="android.permission.BROADCAST_WAP_PUSH">
+            <intent-filter>
+                <action android:name="android.provider.Telephony.WAP_PUSH_DELIVER" />
+                <data android:mimeType="application/vnd.wap.mms-message" />
+            </intent-filter>
+        </receiver>
     </application>
 </manifest>

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

@@ -1,13 +1,17 @@
 package com.simplemobiletools.smsmessenger.activities
 
+import android.app.Activity
 import android.content.Intent
 import android.os.Bundle
+import android.provider.Telephony
+import android.util.Log
 import android.view.Menu
 import android.view.MenuItem
 import com.simplemobiletools.commons.extensions.appLaunched
 import com.simplemobiletools.commons.extensions.checkAppSideloading
 import com.simplemobiletools.commons.helpers.PERMISSION_READ_CONTACTS
 import com.simplemobiletools.commons.helpers.PERMISSION_READ_SMS
+import com.simplemobiletools.commons.helpers.isQPlus
 import com.simplemobiletools.commons.models.FAQItem
 import com.simplemobiletools.smsmessenger.BuildConfig
 import com.simplemobiletools.smsmessenger.R
@@ -22,6 +26,7 @@ import kotlinx.android.synthetic.main.activity_main.*
 
 class MainActivity : SimpleActivity() {
     private var storedTextColor = 0
+    private val MAKE_DEFAULT_APP_REQUEST = 1
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -32,14 +37,13 @@ class MainActivity : SimpleActivity() {
             return
         }
 
-        // while READ_SMS permission is mandatory, READ_CONTACTS is optional. If we don't have it, we just won't be able to show the contact name in some cases
+        if (Telephony.Sms.getDefaultSmsPackage(this) != packageName) {
-        handlePermission(PERMISSION_READ_SMS) {
+            if (isQPlus()) {
-            if (it) {
+
-                handlePermission(PERMISSION_READ_CONTACTS) {
-                    initMessenger()
-                }
             } else {
-                finish()
+                val intent = Intent(Telephony.Sms.Intents.ACTION_CHANGE_DEFAULT)
+                intent.putExtra(Telephony.Sms.Intents.EXTRA_PACKAGE_NAME, packageName)
+                startActivityForResult(intent, MAKE_DEFAULT_APP_REQUEST)
             }
         }
     }
@@ -70,10 +74,34 @@ class MainActivity : SimpleActivity() {
         return true
     }
 
+    override fun onActivityResult(requestCode: Int, resultCode: Int, resultData: Intent?) {
+        super.onActivityResult(requestCode, resultCode, resultData)
+        if (requestCode == MAKE_DEFAULT_APP_REQUEST) {
+            if (resultCode == Activity.RESULT_OK) {
+                askPermissions()
+            } else {
+                finish()
+            }
+        }
+    }
+
     private fun storeStateVariables() {
         storedTextColor = config.textColor
     }
 
+    // while READ_SMS permission is mandatory, READ_CONTACTS is optional. If we don't have it, we just won't be able to show the contact name in some cases
+    private fun askPermissions() {
+        handlePermission(PERMISSION_READ_SMS) {
+            if (it) {
+                handlePermission(PERMISSION_READ_CONTACTS) {
+                    initMessenger()
+                }
+            } else {
+                finish()
+            }
+        }
+    }
+
     private fun initMessenger() {
         storeStateVariables()
         val messages = getMessages()

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

@@ -0,0 +1,23 @@
+package com.simplemobiletools.smsmessenger.activities
+
+import android.os.Bundle
+import com.simplemobiletools.commons.extensions.applyColorFilter
+import com.simplemobiletools.commons.extensions.onTextChangeListener
+import com.simplemobiletools.commons.extensions.value
+import com.simplemobiletools.smsmessenger.R
+import com.simplemobiletools.smsmessenger.adapters.ThreadAdapter
+import com.simplemobiletools.smsmessenger.extensions.config
+import com.simplemobiletools.smsmessenger.extensions.getMessages
+import com.simplemobiletools.smsmessenger.helpers.THREAD_ID
+import com.simplemobiletools.smsmessenger.helpers.THREAD_NAME
+import com.simplemobiletools.smsmessenger.helpers.THREAD_NUMBER
+import com.simplemobiletools.smsmessenger.models.ThreadDateTime
+import com.simplemobiletools.smsmessenger.models.ThreadItem
+import kotlinx.android.synthetic.main.activity_thread.*
+
+class NewMessageActivity : SimpleActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_new_message)
+    }
+}

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

@@ -0,0 +1,11 @@
+package com.simplemobiletools.smsmessenger.receivers
+
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+
+class MmsReceiver : BroadcastReceiver() {
+    override fun onReceive(context: Context, intent: Intent) {
+
+    }
+}

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

@@ -0,0 +1,11 @@
+package com.simplemobiletools.smsmessenger.receivers
+
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+
+class SmsReceiver : BroadcastReceiver() {
+    override fun onReceive(context: Context, intent: Intent) {
+
+    }
+}

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

@@ -0,0 +1,11 @@
+package com.simplemobiletools.smsmessenger.services
+
+import android.app.Service
+import android.content.Intent
+import android.os.IBinder
+
+class HeadlessSmsSendService : Service() {
+    override fun onBind(intent: Intent?): IBinder? {
+        return null
+    }
+}

app/src/main/res/layout/activity_new_message.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/new_message_holder"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+</RelativeLayout>