[Fix #78] Add notification channel support (Android)

src/Message/PayloadNotification.php

@@ -23,6 +23,13 @@ class PayloadNotification implements Arrayable
      */
     protected $body;
 
+    /**
+     * @internal
+     *
+     * @var null/string
+     */
+    protected $channelId;
+
     /**
      * @internal
      *
@@ -102,6 +109,7 @@ public function __construct(PayloadNotificationBuilder $builder)
     {
         $this->title = $builder->getTitle();
         $this->body = $builder->getBody();
+        $this->channelId = $builder->getChannelId();
         $this->icon = $builder->getIcon();
         $this->sound = $builder->getSound();
         $this->badge = $builder->getBadge();
@@ -124,6 +132,7 @@ public function toArray()
         $notification = [
             'title' => $this->title,
             'body' => $this->body,
+            'android_channel_id' => $this->channelId,
             'icon' => $this->icon,
             'sound' => $this->sound,
             'badge' => $this->badge,

src/Message/PayloadNotificationBuilder.php

@@ -39,6 +39,13 @@ class PayloadNotificationBuilder
      */
     protected $sound;
 
+    /**
+     * @internal
+     *
+     * @var null|string
+     */
+    protected $channelId;
+
     /**
      * @internal
      *
@@ -134,6 +141,20 @@ public function setBody($body)
         return $this;
     }
 
+    /**
+     * Set a channel ID for android API >= 26.
+     *
+     * @param string $channelId
+     *
+     * @return PayloadNotificationBuilder current instance of the builder
+     */
+    public function setChannelId($channelId)
+    {
+        $this->channelId = $channelId;
+
+        return $this;
+    }
+
     /**
      * Supported Android
      * Indicates notification icon. example : Sets value to myicon for drawable resource myicon.
@@ -304,6 +325,16 @@ public function getBody()
         return $this->body;
     }
 
+    /**
+     * Get channel id for android api >= 26
+     *
+     * @return null|string
+     */
+    public function getChannelId()
+    {
+        return $this->channelId;
+    }
+
     /**
      * Get Icon.
      *

tests/MessageTest.php

@@ -90,6 +90,7 @@ public function it_construct_a_valid_json_with_notification()
         $targetFull = '{
 					"title":"test_title",
 					"body":"test_body",
+					"android_channel_id":"test_channel_id",
 					"badge":"test_badge",
 					"sound":"test_sound",
 					"tag":"test_tag",
@@ -112,7 +113,9 @@ public function it_construct_a_valid_json_with_notification()
         $json = json_encode($notificationBuilder->build()->toArray());
         $this->assertJsonStringEqualsJsonString($targetPartial, $json);
 
-        $notificationBuilder->setTag('test_tag')
+        $notificationBuilder
+                    ->setChannelId('test_channel_id')
+                    ->setTag('test_tag')
                     ->setColor('test_color')
                     ->setClickAction('test_click_action')
                     ->setBodyLocationKey('test_body_key')