[notifications] Continue android implementation

lib/modules/notifications/Notification.js

@@ -4,16 +4,19 @@
  */
 import AndroidNotification from './AndroidNotification';
 import IOSNotification from './IOSNotification';
-import { isObject } from '../../utils';
+import { generatePushID, isObject } from '../../utils';
 
 import type { NativeAndroidNotification } from './AndroidNotification';
 import type { NativeIOSNotification } from './IOSNotification';
+import type { Schedule } from './';
 
 type NativeNotification = {|
   android: NativeAndroidNotification,
   body: string,
   data: { [string]: string },
   ios: NativeIOSNotification,
+  notificationId: string,
+  schedule?: Schedule,
   sound?: string,
   subtitle?: string,
   title: string,
@@ -25,6 +28,7 @@ export default class Notification {
   _body: string; // alertBody | body | contentText
   _data: { [string]: string }; // userInfo | userInfo | extras
   _ios: IOSNotification;
+  _notificationId: string;
   _sound: string | void; // soundName | sound | sound
   _subtitle: string | void; // N/A | subtitle | subText
   _title: string; // alertTitle | title | contentTitle
@@ -33,6 +37,8 @@ export default class Notification {
     this._android = new AndroidNotification(this);
     this._data = {};
     this._ios = new IOSNotification(this);
+    // TODO: Is this the best way to generate an ID?
+    this._notificationId = generatePushID();
   }
 
   get android(): AndroidNotification {
@@ -68,6 +74,16 @@ export default class Notification {
     return this;
   }
 
+  /**
+   *
+   * @param notificationId
+   * @returns {Notification}
+   */
+  setNotificationId(notificationId: string): Notification {
+    this._notificationId = notificationId;
+    return this;
+  }
+
   /**
    *
    * @param sound
@@ -101,9 +117,13 @@ export default class Notification {
   build(): NativeNotification {
     // Android required fields: body, title, smallicon
     // iOS required fields: TODO
-    if (!this.body) {
+    if (!this._body) {
       throw new Error('Notification: Missing required `body` property');
-    } else if (!this.title) {
+    } else if (!this._notificationId) {
+      throw new Error(
+        'Notification: Missing required `notificationId` property'
+      );
+    } else if (!this._title) {
       throw new Error('Notification: Missing required `title` property');
     }
 
@@ -112,6 +132,7 @@ export default class Notification {
       body: this._body,
       data: this._data,
       ios: this._ios.build(),
+      notificationId: this._notificationId,
       sound: this._sound,
       subtitle: this._subtitle,
       title: this._title,