added notifications for mobile

android/app/src/main/AndroidManifest.xml

@@ -8,7 +8,8 @@
         android:roundIcon="@mipmap/ic_launcher"
         android:supportsRtl="true"
         android:theme="@style/AppTheme"
-        android:requestLegacyExternalStorage="true">
+        android:requestLegacyExternalStorage="true"
+        android:usesCleartextTraffic="true">
         <activity
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|smallestScreenSize|screenLayout|uiMode"
             android:name=".MainActivity"
@@ -40,4 +41,5 @@
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
+<uses-permission android:name="android.permission.SCHEDULE_EXACT_ALARM" />
 </manifest>

android/app/src/main/java/com/example/app/BackgroundFetchHeadlessTask.java

@@ -0,0 +1,31 @@
+package com.example.app;
+
+
+import android.content.Context;
+import android.util.Log;
+
+import com.transistorsoft.tsbackgroundfetch.BackgroundFetch;
+import com.transistorsoft.tsbackgroundfetch.BGTask;
+
+public class BackgroundFetchHeadlessTask{
+    public void onFetch(Context context,  BGTask task) {
+        // Get a reference to the BackgroundFetch Android API.
+        BackgroundFetch backgroundFetch = BackgroundFetch.getInstance(context);
+        // Get the taskId.
+        String taskId = task.getTaskId();
+        // Log a message to adb logcat.
+        Log.d("MyHeadlessTask", "BackgroundFetchHeadlessTask onFetch -- CUSTOM IMPLEMENTATION: " + taskId);
+
+        boolean isTimeout = task.getTimedOut();
+        // Is this a timeout?
+        if (isTimeout) {
+          backgroundFetch.finish(taskId);
+          return;
+        }
+        // Do your work here...
+        //
+        //
+        // Signal finish just like the Javascript API.
+        backgroundFetch.finish(taskId);
+    }
+}