Add function createChannel for custom Android channel support

README.md

@@ -360,7 +360,23 @@ In the location notification json specify the full file name:
 
 ## Channel Management (Android)
 
-This library doesn't include a full Channel Management at the moment. Channels are generated on the fly when you pass options to `PushNotification.localNotification` or `PushNotification.localNotificationSchedule`.
+To use custom channels, create them at startup and pass the matching `channelId` through to `PushNotification.localNotification`
+
+```javascript
+  PushNotification.createChannel(
+    {
+      channelId: "custom-channel-id", // (required)
+      channelName: "Custom channel", // (required)
+      channelDesc: "A custom channel to categorise your custom notifications", // (optional) default: undefined.
+      soundName: "default", // (optional) See `soundName` parameter of `localNotification` function
+      importance: 4, // (optional) default: 4. Int value of the Android notification importance
+      vibrate: true, // (optional) default: true. Creates the default vibration patten if true.
+    },
+    (created: any) => console.log(`createChannel returned '${created}'`) // (optional) callback returns whether the channel was created, false means it already existed.
+  );
+```
+
+Channels with ids that do not exist are generated on the fly when you pass options to `PushNotification.localNotification` or `PushNotification.localNotificationSchedule`.
 
 The pattern of `channel_id` is:
 

android/src/main/java/com/dieam/reactnativepushnotification/modules/RNPushNotification.java

@@ -297,6 +297,18 @@ public void channelExists(String channel_id, Callback callback) {
       }
     }
 
+    @ReactMethod
+    /**
+     * Creates a channel if it does not already exist. Returns whether the channel was created.
+     */
+    public void createChannel(ReadableMap channelInfo, Callback callback) {
+      boolean created = mRNPushNotificationHelper.createChannel(channelInfo);
+
+      if(callback != null) {
+        callback.invoke(created);
+      }
+    }
+
     @ReactMethod
     /**
      * Check if channel is blocked with a given id

android/src/main/java/com/dieam/reactnativepushnotification/modules/RNPushNotificationHelper.java

@@ -428,31 +428,13 @@ public void sendToNotificationCentreWithPicture(Bundle bundle, Bitmap largeIconB
             Uri soundUri = null;
 
             if (!bundle.containsKey("playSound") || bundle.getBoolean("playSound")) {
-                soundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
-
                 String soundName = bundle.getString("soundName");
-
-                if (soundName != null) {
-                    if (!"default".equalsIgnoreCase(soundName)) {
-
-                        // sound name can be full filename, or just the resource name.
-                        // So the strings 'my_sound.mp3' AND 'my_sound' are accepted
-                        // The reason is to make the iOS and android javascript interfaces compatible
-
-                        int resId;
-                        if (context.getResources().getIdentifier(soundName, "raw", context.getPackageName()) != 0) {
-                            resId = context.getResources().getIdentifier(soundName, "raw", context.getPackageName());
-                        } else {
-                            soundName = soundName.substring(0, soundName.lastIndexOf('.'));
-                            resId = context.getResources().getIdentifier(soundName, "raw", context.getPackageName());
-                        }
-
-                        soundUri = Uri.parse("android.resource://" + context.getPackageName() + "/" + resId);
-                    }
-                } else {
+                if (soundName == null) {
                     soundName = "default";
                 }
 
+                soundUri = getSoundUri(soundName);
+
                 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { // API 26 and higher
                     channel_id = channel_id + "-" + soundName;
                 }
@@ -676,6 +658,27 @@ private void scheduleNextNotificationIfRepeating(Bundle bundle) {
         }
     }
 
+    private Uri getSoundUri(String soundName) {
+        if (soundName == null || "default".equalsIgnoreCase(soundName)) {
+            return RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
+        } else {
+
+            // sound name can be full filename, or just the resource name.
+            // So the strings 'my_sound.mp3' AND 'my_sound' are accepted
+            // The reason is to make the iOS and android javascript interfaces compatible
+
+            int resId;
+            if (context.getResources().getIdentifier(soundName, "raw", context.getPackageName()) != 0) {
+                resId = context.getResources().getIdentifier(soundName, "raw", context.getPackageName());
+            } else {
+                soundName = soundName.substring(0, soundName.lastIndexOf('.'));
+                resId = context.getResources().getIdentifier(soundName, "raw", context.getPackageName());
+            }
+
+            return Uri.parse("android.resource://" + context.getPackageName() + "/" + resId);
+        }
+    }
+
     public void clearNotifications() {
         Log.i(LOG_TAG, "Clearing alerts from the notification centre");
 
@@ -899,11 +902,11 @@ public void deleteChannel(String channel_id) {
         manager.deleteNotificationChannel(channel_id);
     }
 
-    private void checkOrCreateChannel(NotificationManager manager, String channel_id, String channel_name, String channel_description, Uri soundUri, int importance, long[] vibratePattern) {
+    private boolean checkOrCreateChannel(NotificationManager manager, String channel_id, String channel_name, String channel_description, Uri soundUri, int importance, long[] vibratePattern) {
         if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O)
-            return;
+            return false;
         if (manager == null)
-            return;
+            return false;
 
         NotificationChannel channel = manager.getNotificationChannel(channel_id);
 
@@ -920,7 +923,7 @@ private void checkOrCreateChannel(NotificationManager manager, String channel_id
 
             channel.setDescription(channel_description);
             channel.enableLights(true);
-            channel.enableVibration(true);
+            channel.enableVibration(vibratePattern != null);
             channel.setVibrationPattern(vibratePattern);
 
             if (soundUri != null) {
@@ -935,7 +938,28 @@ private void checkOrCreateChannel(NotificationManager manager, String channel_id
             }
 
             manager.createNotificationChannel(channel);
+            return true;
         }
+        return false;
+    }
+
+    public boolean createChannel(ReadableMap channelInfo) {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O)
+            return false;
+
+        String channelId = channelInfo.getString("channelId");
+        String channelName = channelInfo.getString("channelName");
+        String channelDesc = channelInfo.hasKey("channelDesc") ? channelInfo.getString("channelDesc") : null;
+        String soundName = channelInfo.hasKey("soundName") ? channelInfo.getString("soundName") : "default";
+        int importance = channelInfo.hasKey("importance") ? channelInfo.getInt("importance") : 4;
+        boolean vibrate = channelInfo.hasKey("vibrate") && channelInfo.getBoolean("vibrate");
+        long[] vibratePattern = vibrate ? new long[] { DEFAULT_VIBRATION } : null;
+
+        NotificationManager manager = notificationManager();
+
+        Uri soundUri = getSoundUri(soundName);
+
+        return checkOrCreateChannel(manager, channelId, channelName, channelDesc, soundUri, importance, vibratePattern);
     }
 
     public boolean isApplicationInForeground(Context context) {

component/index.android.js

@@ -154,6 +154,10 @@ NotificationsComponent.prototype.channelExists = function(channel_id, callback)
 	RNPushNotification.channelExists(channel_id, callback);
 }
 
+NotificationsComponent.prototype.createChannel = function(channelInfo, callback) {
+	RNPushNotification.createChannel(channelInfo, callback);
+}
+
 NotificationsComponent.prototype.channelBlocked = function(channel_id, callback) {
 	RNPushNotification.channelBlocked(channel_id, callback);
 }

index.js

@@ -513,6 +513,10 @@ Notifications.channelExists = function() {
   return this.callNative('channelExists', arguments);
 };
 
+Notifications.createChannel = function() {
+  return this.callNative('createChannel', arguments);
+};
+
 Notifications.channelBlocked = function() {
   return this.callNative('channelBlocked', arguments);
 };