Flutter: FCM not sending notifications on android release

See also questions close to this topic

• Flutter: Crash in release mode for android V2 upgrade

  I upgrade my android to V2 and now my app crash at the splash screen in release mode.

  This is the error I see

  Caused by java.lang.IllegalStateException: ensureInitializationComplete must be called after startInitialization
         at io.flutter.embedding.engine.loader.FlutterLoader.ensureInitializationComplete(FlutterLoader.java:292)
         at io.flutter.view.FlutterMain.ensureInitializationComplete(FlutterMain.java:8)
         at io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService.onCreate(FlutterFirebaseMessagingService.java:10)
         at android.app.ActivityThread.handleCreateService(ActivityThread.java:3542)
         at android.app.ActivityThread.-wrap4(ActivityThread.java)
         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1786)
         at android.os.Handler.dispatchMessage(Handler.java:105)
         at android.os.Looper.loop(Looper.java:164)
         at android.app.ActivityThread.main(ActivityThread.java:6938)
         at java.lang.reflect.Method.invoke(Method.java)
         at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
  

  I am using Flutter 1.22.4

  Please let me know how to fix this issue.

  Thanks
• How to remove vertical space between GridView rows

  I'm new to kotlin and I am developing an app that uses a gridview. I've managed to make the gridview work, however I want to remove the space between each row. I've tried setting padding and vertical spacing to 0dp, my listSelector is @null but nothing seems to work. What should I do to remove the vertical space between rows?

  Grid View:

  ---

  <?xml version="1.0" encoding="utf-8"?>
  <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:background="@color/colorPrimary">
  
      <GridView
          android:id="@+id/home_grid"
          android:numColumns="3"
          android:verticalSpacing="0dp"
          android:horizontalSpacing="0dp"
          android:background="@color/colorPrimary"
          android:layout_width="fill_parent"
          android:layout_height="fill_parent"
          android:layout_gravity="top"
          android:stretchMode="columnWidth"
          android:listSelector="@null"
          android:gravity="center"
          android:paddingVertical="0dp"/>
  
  </RelativeLayout>
  

  Image View:

  ---

  <?xml version="1.0" encoding="utf-8"?>
  <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:background="@color/colorPrimary">
      
          <ImageView
              android:id="@+id/grid_image"
              android:layout_width="200dp"
              android:layout_height="200dp"
              android:adjustViewBounds="true"/>
  
  </RelativeLayout>
  
• Cordova Sending Data From Android Java to Javascript

  I am working with Cordova and the inAppBrowser plugin for Android. I am trying to expand upon a previous question,

  https://stackoverflow.com/questions/65534821/cordova-inappbrowser-hide-show-in-java-android/65627954?noredirect=1#comment116337002_65627954
  

  where the inAppBrowser hardware back button was linked to the Javascript .hide function, to hide the browser but not exit it. This problem was solved, however created a new problem, inAppBrowser does not have a visibility status to say if it is either shown or hidden to the user.

  I would like to send a message from Java to Cordova Javascript with the hide update.

  Here is were we left off

  I edited InAppBrowserDialog.java

  I added

  import org.apache.cordova.CordovaArgs;
  import org.json.JSONArray;
  

  And added inside the

  public class InAppBrowserDialog extends Dialog {
  

  the following

  public void hideDialog() {
    CordovaArgs args = new CordovaArgs(new JSONArray());
      try {
        this.inAppBrowser.execute("hide", args, new FakeCallbackContext());
      } catch (JSONException e) {
        e.printStackTrace();
      }
   }
  
  public void showDialog() {
    CordovaArgs args = new CordovaArgs(new JSONArray());
    try {
        this.inAppBrowser.execute("show", args, new FakeCallbackContext());
    } catch (JSONException e) {
        e.printStackTrace();
    }
  } 
  

  I then created a new java file in the same directory, called

  FakeCallbackContext.java
  

  And placed the following code inside

  package org.apache.cordova.inappbrowser;
  
  import org.apache.cordova.CallbackContext;
  import org.apache.cordova.PluginResult;
  
  class FakeCallbackContext extends CallbackContext {
  
  public FakeCallbackContext() {
    super(null, null);
  
  }
  
  @Override
  public void sendPluginResult(PluginResult pluginResult) {
    // Do not send an actual result to the webview
    // Perhaps just log the result
  
    //<<<< This is where I need to send an update back to a Cordova listener 
    //<<<<   so I can let Cordova know that the inAppBrowser is now hidden
  
  }
  }
  

  I have tried to incorporate several different solutions, such as

  webView.loadUrlNow("javascript:" + js);
  

  But from what I have read you have to be inside the main Cordova class, and not a plugin.
• How can I save the page route with Shared Preferences on Flutter?

  I want to save the page route in the Shared preferences so I can be navigated to the same page after restarting the app.
• How to import xml file to dart object

  I'm trying to import an xml file exported by c# XmlSerializer to dart object using xml package but all my tries of importing failed.

  <?xml version="1.0" encoding="utf-8"?>
  <ArrayOfViewReads xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <ViewReads>
      <CounterAccount>7e7386db-ae4e-47f8-a473-8a5534b8b421</CounterAccount>
      <ParentCounter>00000000-0000-0000-0000-000000000000</ParentCounter>
      <CounterGuid>88165f87-113b-4503-bd95-01cfc778cf0e</CounterGuid>
      <CounterID>354</CounterID>
      <AccountName>يحي العامر</AccountName>
      <AreaName>مربع الشارع العام  وغزه</AreaName>
      <AddressDesc>منطقه الوء الاخضر</AddressDesc>
      <Phone>771707009</Phone>
      <FazName>سنجل فاز</FazName>
      <Balance>865.0000</Balance>
      <LastRead>7332.00</LastRead>
    </ViewReads>
    <ViewReads>
      <CounterAccount>46e2bacc-644f-47fb-abe7-6589f880667e</CounterAccount>
      <ParentCounter>00000000-0000-0000-0000-000000000000</ParentCounter>
      <CounterGuid>2d2f1a40-9dcf-4a3c-9fd2-081d3be83aaa</CounterGuid>
      <CounterID>2052</CounterID>
      <AccountName>كمال محمد علي ثامر</AccountName>
      <AreaName>مربع الشارع العام  وغزه</AreaName>
      <AddressDesc>خلف كوافير السلطانه</AddressDesc>
      <Phone>771363922</Phone>
      <FazName>سنجل فاز</FazName>
      <Balance>1560.0000</Balance>
      <LastRead>84.00</LastRead>
      <UserGuid>00000000-0000-0000-0000-000000000000</UserGuid>
    </ViewReads>
  </ArrayOfViewReads>
  

  And here is my importing code from dart using fromJson() method that generated by VSCode:

    final file = File('C:\\Users\\SALMAN\\Desktop\\2021_1_19_559.xml');
    final document = XmlDocument.parse(file.readAsStringSync());
  
    document.children.forEach((e) {
      var v = ViewRead.fromJson(e.toString());
    });
  

  And this is the error after I tried running the code:

  Unhandled exception:
  FormatException: Unexpected character (at character 1)
  <?xml version="1.0" encoding="utf-8"?>
  ^
  
  #0      _ChunkedJsonParser.fail (dart:convert-patch/convert_patch.dart:1404:5)
  #1      _ChunkedJsonParser.parseNumber (dart:convert-patch/convert_patch.dart:1271:9)
  #2      _ChunkedJsonParser.parse (dart:convert-patch/convert_patch.dart:936:22)
  #3      _parseJson (dart:convert-patch/convert_patch.dart:40:10)
  #4      JsonDecoder.convert (dart:convert/json.dart:505:36)
  #5      JsonCodec.decode (dart:convert/json.dart:156:41)
  #6      new ViewRead.fromJson (file:///C:/Users/SALMAN/.IntelliJIdea2019.1/dart/bin/dart.dart:170:70)
  #7      main.<anonymous closure> (file:///C:/Users/SALMAN/.IntelliJIdea2019.1/dart/bin/dart.dart:16:22)
  #8      List.forEach (dart:core-patch/growable_array.dart:313:8)
  #9      _DelegatingIterableBase.forEach (package:collection/src/wrappers.dart:52:45)
  #10     main (file:///C:/Users/SALMAN/.IntelliJIdea2019.1/dart/bin/dart.dart:15:21)
  #11     _startIsolate.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:299:32)
  #12     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:168:12)
  
  
• Running Gradle task 'assembleDebug'. (This is taking an unexpectedly long time.)

  when I created a very basic flutter app and ran it for the first time, it works perfectly, and when I try to add some dependencies in my pubspec.yaml file I get no errors in my project but when I run the app by 'flutter run' I get stuck in

  Running Gradle task 'assembleDebug'...            
  (This is taking an unexpectedly long time.) 
  

  and the app has never worked
  this is my pubspec.yaml file

  name: myPDFApp  
  description: A new Flutter project. 
  publish_to: 'none' 
  version: 1.0.0+1
  environment: 
   sdk: ">=2.7.0 <3.0.0"
  
  dependencies:
  flutter:
     sdk: flutter   
  cupertino_icons: ^1.0.0
  syncfusion_flutter_pdfviewer: ^18.4.35-beta // this is the dep that I want to add
  
  
  dev_dependencies:
  flutter_test:   
    sdk: flutter 
  
  flutter:
    uses-material-design: true
  
• How to display the time elapsed from a timestamp?

  To be more precise, I would like to display the number of minutes passed since a timestamp fetched from an API. Should Stopwatch or Timer be used, or something else?
• Firebase Cloud Messaging - Failed to send notification via server

  I have an application that sends messages from the Server to Android through Firebase and it works. However, I am developing a new project with "andoirdx" and after the new changes in Firebase I am no longer able to use the same PHP server application as the basis for sending notifications. Using the Firebase console I can send notifications to my application. Here is the code of the PHP server I am using as a base.

  send.php

  <?php
  // Enabling error reporting
  error_reporting(-1);
  ini_set('display_errors', 'On');
  
  require_once __DIR__ . '/firebase.php';
  require_once __DIR__ . '/push.php';
  
  $firebase = new Firebase();
  $push = new Push();
  
  $message = isset($_GET['message']) ? $_GET['message'] : '';
  $tipo = isset($_GET['tipo']) ? $_GET['tipo'] : '';
  $latitude = isset($_GET['latitude']) ? $_GET['latitude'] : '';
  $longitude = isset($_GET['longitude']) ? $_GET['longitude'] : '';
  $push_type = isset($_GET['push_type']) ? $_GET['push_type'] : '';
  
  $push->setMessage($message);
  $push->setTipo($tipo);
  $push->setLatitude($latitude);
  $push->setLongitude($longitude);
  $push->setIsBackground(false);
  
  $json = '';
  $response = '';
  
  if ($push_type == 'global') {
      $json = $push->getPush();
      $response = $firebase->sendToTopic('global', $json);
  } 
  else if ($push_type == 'individual') {
      $json = $push->getPush();
      $regId = isset($_GET['token']) ? $_GET['token'] : '';
      $response = $firebase->send($regId, $json);
  }
  
  echo "Request: ".json_encode($json)."<p>";
  echo " - Response: ". json_encode($response)."<p>";
  ?>

  push.php

  <?php
  class Push { 
      private $message;
      private $tipo;
      private $latitude;
      private $longitude;
          
      /* flag indicating whether to show the push notification or not this flag will be useful 
       * when perform some opertation in background when push is recevied     
      */
      private $is_background;
  
      function __construct() {  }
      
  
      public function setMessage($message) {
          $this->message = $message;
      }
  
      public function setIsBackground($is_background) {
          $this->is_background = $is_background;
      }
      
      public function setTipo($tipo) {
          $this->tipo = $tipo;
      }
          
      /**
       * @param field_type $latitude
       */
      public function setLatitude($latitude) {
          $this->latitude = $latitude;
      }
  
      /**
       * @param field_type $longitude
       */
      public function setLongitude($longitude) {
          $this->longitude = $longitude;
      }
  
      public function getPush() {
          $res = array();       
          $res['data']['message'] = $this->message;
          $res['data']['tipo'] = $this->tipo;
          $res['data']['latitude'] = $this->latitude;
          $res['data']['longitude'] = $this->longitude;
          
          return $res;
      }
  }

  firebase.php

  <?php
  class Firebase {
  
      // sending push message to single user by firebase reg id
      public function send($to, $message) {
          $fields = array(
              'to' => $to,
              'data' => $message,
          );
          return $this->sendPushNotification($fields);
      }
  
      // Sending message to a topic by topic name
      public function sendToTopic($to, $message) {
          $fields = array(
              'to' =>'/topics/'. $to,
              'data' => $message,
          );
          return $this->sendPushNotification($fields);
      }
  
      // sending push message to multiple users by firebase registration ids
      public function sendMultiple($registration_ids, $message) {
          $fields = array(
              'to' => $registration_ids,
              'data' => $message,
          );
  
          return $this->sendPushNotification($fields);
      }
  
      // function makes curl request to firebase servers
      private function sendPushNotification($fields) {
          
          require_once __DIR__ . '/config.php';
  
          // Set POST variables
          $url = 'https://fcm.googleapis.com/fcm/send';
  
          $headers = array(
              'Authorization: key=' . FIREBASE_API_KEY,
              'Content-Type: application/json'
          );
          // Open connection
          $ch = curl_init();
  
          // Set the url, number of POST vars, POST data
          curl_setopt($ch, CURLOPT_URL, $url);
  
          curl_setopt($ch, CURLOPT_POST, true);
          curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
          curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  
          // Disabling SSL Certificate support temporarly
          curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
  
          curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($fields));
  
          // Execute post
          $result = curl_exec($ch);
          if ($result === FALSE) {
              die('Curl failed: ' . curl_error($ch));
          }
  
          // Close connection
          curl_close($ch);
          return $result;
      }
  }
  
  ?>

  config.php

  <?php
  
  // Firebase API Key
  define('FIREBASE_API_KEY', 'XXXXXY-xxxx:XXXXXXXxxxxxxxxxxxXXXXXXXXXXXXXXXXXXxxXXXX_XXXXXXXXXXXXXX-0000000-XxX0xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx');
  ?>
• How to sent a notification to all users using FCM?

  I am able to sent a custom notification to my own device using Advanced REST Client using this code:

  https://fcm.googleapis.com/fcm/send

  content-type application/json

  Authorization KEY=XXXXXXXXXX

  {
  "data": {
  "title": "Update",
  "content": "Test"
  },
  "to": "cju4nq0nQ9C8YAkVZZ_lh7:APA91bG........
  }
  

  I have no idea how to send this to all users. I read something about using topics, but don't know how to apply that here.

  Can you point me in a direction or have a solution for this problem?
• FCM getting registration token from not default FCM service

  After update to newest Firebase there is not method for getting FCM registration token for selected fcmSenderId:

    FirebaseInstanceId
           .getInstance()
           .getToken(fcmSenderId, "FCM")
  

  Documentation says to use FirebaseMessaging instead (https://firebase.google.com/docs/reference/android/com/google/firebase/messaging/FirebaseMessaging#getToken()):

      FirebaseMessaging
                  .getInstance()
                  .token
                  .addOnCompleteListener { task ->
                      if (task.isSuccessful) {
                          task.result?.let { token ->
                              println(token)
                          }
                      } else {
                          println(task.exception)
                      }
                  }
  

  but this method doesn't allow to provide custom FCM Sender Id.

  The project has configured google-services.json but need to use another FCM project.