show a heads up notification at incoming call, not the fullscreen dialer

app/src/main/AndroidManifest.xml

@@ -18,6 +18,7 @@
     <uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS"/>
     <uses-permission android:name="android.permission.ANSWER_PHONE_CALLS"/>
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
+    <uses-permission android:name="android.permission.MANAGE_OWN_CALLS"/>
 
     <uses-feature
         android:name="android.hardware.telephony"
@@ -246,11 +247,23 @@
 
         <service
             android:name=".services.MyIncomingCallService"
+            android:directBootAware="true"
+            android:enabled="true"
+            android:exported="true"
             android:permission="android.permission.BIND_INCALL_SERVICE">
+
             <meta-data
                 android:name="android.telecom.IN_CALL_SERVICE_UI"
                 android:value="true"/>
 
+            <meta-data
+                android:name="android.telecom.IN_CALL_SERVICE_RINGING"
+                android:value="false"/>
+
+            <meta-data
+                android:name="android.telecom.INCLUDE_EXTERNAL_CALLS"
+                android:value="true"/>
+
             <intent-filter>
                 <action android:name="android.telecom.InCallService"/>
             </intent-filter>
@@ -260,9 +273,8 @@
             android:name=".services.MyOutgoingCallService"
             android:exported="true"
             android:permission="android.permission.BIND_TELECOM_CONNECTION_SERVICE">
-
             <intent-filter>
-                <action android:name="android.telecomm.ConnectionService"/>
+                <action android:name="android.telecom.ConnectionService"/>
             </intent-filter>
         </service>
 

app/src/main/kotlin/com/simplemobiletools/contacts/pro/helpers/MyConnection.kt

@@ -0,0 +1,33 @@
+package com.simplemobiletools.contacts.pro.helpers
+
+import android.annotation.TargetApi
+import android.content.Context
+import android.os.Build
+import android.telecom.Connection
+import android.telecom.DisconnectCause
+
+@TargetApi(Build.VERSION_CODES.M)
+class MyConnection(val context: Context) : Connection() {
+    override fun onAnswer() {
+        super.onAnswer()
+        setActive()
+    }
+
+    override fun onReject() {
+        super.onReject()
+        setDisconnected(DisconnectCause(DisconnectCause.LOCAL))
+        destroy()
+    }
+
+    override fun onAbort() {
+        super.onAbort()
+        setDisconnected(DisconnectCause(DisconnectCause.REMOTE))
+        destroy()
+    }
+
+    override fun onDisconnect() {
+        super.onDisconnect()
+        setDisconnected(DisconnectCause(DisconnectCause.CANCELED))
+        destroy()
+    }
+}

app/src/main/kotlin/com/simplemobiletools/contacts/pro/services/DialerCallService.kt

@@ -47,7 +47,7 @@ class DialerCallService : Service() {
         if (isOreoPlus()) {
             val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
             val name = resources.getString(R.string.app_name)
-            val importance = NotificationManager.IMPORTANCE_LOW
+            val importance = NotificationManager.IMPORTANCE_HIGH
             NotificationChannel(channelId, name, importance).apply {
                 enableLights(false)
                 enableVibration(false)

app/src/main/kotlin/com/simplemobiletools/contacts/pro/services/MyIncomingCallService.kt

@@ -6,11 +6,10 @@ import android.os.Build
 import android.telecom.Call
 import android.telecom.InCallService
 import androidx.localbroadcastmanager.content.LocalBroadcastManager
-import com.simplemobiletools.contacts.pro.activities.DialerActivity
 import com.simplemobiletools.contacts.pro.helpers.CALL_NUMBER
 import com.simplemobiletools.contacts.pro.helpers.CALL_STATUS
 import com.simplemobiletools.contacts.pro.helpers.DIALER_INTENT_FILTER
-import com.simplemobiletools.contacts.pro.helpers.INCOMING_CALL
+import com.simplemobiletools.contacts.pro.helpers.IS_INCOMING_CALL
 import com.simplemobiletools.contacts.pro.objects.CallManager
 
 @TargetApi(Build.VERSION_CODES.M)
@@ -27,12 +26,13 @@ class MyIncomingCallService : InCallService() {
             handle
         }
 
-        Intent(this, DialerActivity::class.java).apply {
+        Intent(this, DialerCallService::class.java).apply {
-            action = INCOMING_CALL
             putExtra(CALL_STATUS, call.state)
             putExtra(CALL_NUMBER, callerNumber)
-            startActivity(this)
+            putExtra(IS_INCOMING_CALL, true)
+            startService(this)
         }
+
         CallManager.updateCall(call)
     }
 
@@ -46,6 +46,11 @@ class MyIncomingCallService : InCallService() {
         override fun onStateChanged(call: Call, state: Int) {
             CallManager.updateCall(call)
             sendCallToActivity(call)
+            if (state == Call.STATE_DISCONNECTED) {
+                Intent(applicationContext, DialerCallService::class.java).apply {
+                    stopService(this)
+                }
+            }
         }
     }
 

app/src/main/kotlin/com/simplemobiletools/contacts/pro/services/MyOutgoingCallService.kt

@@ -1,10 +1,18 @@
 package com.simplemobiletools.contacts.pro.services
 
 import android.annotation.TargetApi
+import android.net.Uri
 import android.os.Build
-import android.telecom.ConnectionService
+import android.telecom.*
+import com.simplemobiletools.contacts.pro.helpers.MyConnection
 
 @TargetApi(Build.VERSION_CODES.M)
 class MyOutgoingCallService : ConnectionService() {
-
+    override fun onCreateIncomingConnection(connectionManagerPhoneAccount: PhoneAccountHandle, request: ConnectionRequest): Connection {
+        val connection = MyConnection(applicationContext)
+        val phoneNumber = request.extras.get(TelecomManager.EXTRA_INCOMING_CALL_ADDRESS) as Uri
+        connection.setAddress(phoneNumber, TelecomManager.PRESENTATION_ALLOWED)
+        connection.setRinging()
+        return connection
+    }
 }