Enable replying from the push notification (#871)

* Enable replying from the push notification

* Fix Android and iOS flow

* Own review

android/app/src/main/java/com/mattermost/rnbeta/NotificationReplyService.java

@@ -0,0 +1,49 @@
+package com.mattermost.rnbeta;
+
+import android.content.Context;
+import android.content.Intent;
+import android.app.NotificationManager;
+import android.app.RemoteInput;
+import android.os.Bundle;
+import android.support.annotation.Nullable;
+
+import com.facebook.react.HeadlessJsTaskService;
+import com.facebook.react.bridge.Arguments;
+import com.facebook.react.jstasks.HeadlessJsTaskConfig;
+
+
+import com.wix.reactnativenotifications.core.NotificationIntentAdapter;
+
+public class NotificationReplyService extends HeadlessJsTaskService {
+
+    @Override
+    protected @Nullable HeadlessJsTaskConfig getTaskConfig(Intent intent) {
+        if (CustomPushNotification.KEY_TEXT_REPLY.equals(intent.getAction())) {
+            CharSequence message = getReplyMessage(intent);
+
+            Bundle bundle = NotificationIntentAdapter.extractPendingNotificationDataFromIntent(intent);
+            String channelId = bundle.getString("channel_id");
+            bundle.putCharSequence("text", message);
+            bundle.putInt("msg_count", CustomPushNotification.getMessageCountInChannel(channelId));
+
+            int notificationId = intent.getIntExtra(CustomPushNotification.NOTIFICATION_ID, -1);
+            CustomPushNotification.clearNotification(notificationId, channelId);
+
+            return new HeadlessJsTaskConfig(
+                    "notificationReplied",
+                    Arguments.fromBundle(bundle),
+                    5000);
+
+        }
+
+        return null;
+    }
+
+    private CharSequence getReplyMessage(Intent intent) {
+        Bundle remoteInput = RemoteInput.getResultsFromIntent(intent);
+        if (remoteInput != null) {
+            return remoteInput.getCharSequence(CustomPushNotification.KEY_TEXT_REPLY);
+        }
+        return null;
+    }
+}