adding an initial implementation of the incoming call notification

app/src/main/kotlin/com/simplemobiletools/contacts/pro/activities/CallActivity.kt

@@ -1,11 +1,26 @@
 package com.simplemobiletools.contacts.pro.activities
 
+import android.annotation.SuppressLint
+import android.app.Notification
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.app.PendingIntent
+import android.content.Intent
 import android.os.Bundle
+import android.widget.RemoteViews
+import androidx.core.app.NotificationCompat
+import com.simplemobiletools.commons.extensions.notificationManager
+import com.simplemobiletools.commons.extensions.setText
 import com.simplemobiletools.commons.extensions.updateTextColors
+import com.simplemobiletools.commons.helpers.isOreoPlus
 import com.simplemobiletools.contacts.pro.R
+import com.simplemobiletools.contacts.pro.helpers.ACCEPT_CALL
+import com.simplemobiletools.contacts.pro.helpers.DECLINE_CALL
+import com.simplemobiletools.contacts.pro.receivers.CallActionReceiver
 import kotlinx.android.synthetic.main.activity_call.*
 
 class CallActivity : SimpleActivity() {
+    private val CALL_NOTIFICATION_ID = 1
 
     override fun onCreate(savedInstanceState: Bundle?) {
         supportActionBar?.hide()
@@ -14,6 +29,12 @@ class CallActivity : SimpleActivity() {
 
         updateTextColors(call_holder)
         initButtons()
+        showNotification()
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        notificationManager.cancel(CALL_NOTIFICATION_ID)
     }
 
     private fun initButtons() {
@@ -24,4 +45,55 @@ class CallActivity : SimpleActivity() {
         call_toggle_speaker.setOnClickListener { }
         call_dialpad.setOnClickListener { }
     }
+
+    @SuppressLint("NewApi")
+    private fun showNotification() {
+        val channelId = "simple_contacts_call"
+        if (isOreoPlus()) {
+            val importance = NotificationManager.IMPORTANCE_HIGH
+            val name = "call_notification_channel"
+
+            NotificationChannel(channelId, name, importance).apply {
+                notificationManager.createNotificationChannel(this)
+            }
+        }
+
+        val openAppIntent = Intent(this, CallActivity::class.java)
+        openAppIntent.flags = Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT
+        val openAppPendingIntent = PendingIntent.getActivity(this, 0, openAppIntent, 0)
+
+        val acceptCallIntent = Intent(this, CallActionReceiver::class.java)
+        acceptCallIntent.action = ACCEPT_CALL
+        val acceptPendingIntent = PendingIntent.getBroadcast(this, 0, acceptCallIntent, PendingIntent.FLAG_CANCEL_CURRENT)
+
+        val declineCallIntent = Intent(this, CallActionReceiver::class.java)
+        declineCallIntent.action = DECLINE_CALL
+        val declinePendingIntent = PendingIntent.getBroadcast(this, 1, declineCallIntent, PendingIntent.FLAG_CANCEL_CURRENT)
+
+        val callerName = "Caller name"
+        val contentText = getString(R.string.incoming_call)
+
+        val collapsedView = RemoteViews(packageName, R.layout.call_notification).apply {
+            setText(R.id.notification_caller_name, callerName)
+            setText(R.id.notification_caller_number, contentText)
+
+            setOnClickPendingIntent(R.id.notification_decline_call, declinePendingIntent)
+            setOnClickPendingIntent(R.id.notification_accept_call, acceptPendingIntent)
+        }
+
+        val builder = NotificationCompat.Builder(this, channelId)
+            .setSmallIcon(R.drawable.ic_phone_vector)
+            .setContentIntent(openAppPendingIntent)
+            .setPriority(NotificationCompat.PRIORITY_MAX)
+            .setDefaults(Notification.DEFAULT_LIGHTS)
+            .setCategory(Notification.CATEGORY_EVENT)
+            .setCustomContentView(collapsedView)
+            .setOngoing(true)
+            .setAutoCancel(true)
+            .setChannelId(channelId)
+            .setStyle(NotificationCompat.DecoratedCustomViewStyle())
+
+        val notification = builder.build()
+        notificationManager.notify(CALL_NOTIFICATION_ID, notification)
+    }
 }

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

@@ -34,6 +34,10 @@ const val ADD_NEW_CONTACT_NUMBER = "add_new_contact_number"
 const val FIRST_CONTACT_ID = 1000000
 const val FIRST_GROUP_ID = 10000L
 
+private const val PATH = "com.simplemobiletools.contacts.action."
+const val ACCEPT_CALL = PATH + "accept_call"
+const val DECLINE_CALL = PATH + "decline_call"
+
 // extras used at third party intents
 const val KEY_PHONE = "phone"
 const val KEY_NAME = "name"

app/src/main/kotlin/com/simplemobiletools/contacts/pro/receivers/CallActionReceiver.kt

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

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

@@ -0,0 +1,13 @@
+package com.simplemobiletools.contacts.pro.services
+
+import android.os.Build
+import android.telecom.Call
+import android.telecom.InCallService
+import androidx.annotation.RequiresApi
+
+@RequiresApi(Build.VERSION_CODES.M)
+class CallService : InCallService() {
+    override fun onCallAdded(call: Call) {
+        super.onCallAdded(call)
+    }
+}