title: firebase cloud messaging Android push notification not working
body: <p>I have an android app that sends that is supposed to send a push notification to users. When the notification is received by the user, the user taps on the notification and the app is opened and a url is opened in the android webview.</p>
  
  <p>but my app is not receiving any notification. 
  here is the code</p>
  
  <pre><code>    public class MainActivity extends AppCompatActivity {
           private WebView webView;
           private ProgressDialog dialog;
           private BroadcastReceiver mRegistrationBroadcastReciever;
           private final String CHANNEL_ID="notificcation";        
           @Override
           protected void onCreate(Bundle savedInstanceState) {
               super.onCreate(savedInstanceState);
               setContentView(R.layout.activity_main);
               webView=(WebView)findViewById(R.id.webView);
               webView.getSettings().setJavaScriptEnabled(true);
               webView.setWebChromeClient(new WebChromeClient());
               webView.setWebViewClient(new WebViewClient(){
                    @Override
                    public void onPageFinished(WebView view, String url) {
                        if(dialog.isShowing())
                           dialog.dismiss();
                    }
               });     
               mRegistrationBroadcastReciever=new BroadcastReceiver() {
                    @Override
                    public void onReceive(Context context, Intent intent) {
                        if(intent.getAction().equals(Config.STR_PUSH)){
                            String message=intent.getStringExtra(Config.STR_MESSAGE);
                            showNotification("MSG",message);
                        }    
                    }
               };
               onNewIntent(getIntent());
           }
           @Override
           protected void onNewIntent(Intent intent) {
                dialog=new ProgressDialog(this);
                if(intent.getStringExtra(Config.STR_KEY)!=null){
                    dialog.show();
                    dialog.setMessage("Please Wait");
                    webView.loadUrl(intent.getStringExtra(Config.STR_KEY));    
                }
           }    
           private void showNotification(String title, String message) {
                Intent intent =new Intent(getBaseContext(),MainActivity.class);
                intent.putExtra(Config.STR_KEY,message);
                intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
                PendingIntent contentIntent=PendingIntent.getActivity(getBaseContext(),0,intent,PendingIntent.FLAG_UPDATE_CURRENT);
                NotificationCompat.Builder builder=new NotificationCompat.Builder(getBaseContext(),CHANNEL_ID);
                builder.setAutoCancel(true)
                .setWhen(System.currentTimeMillis())
                .setDefaults(Notification.DEFAULT_ALL)
                .setSmallIcon(R.mipmap.ic_launcher_round)
                .setContentTitle(title)
                .setContentText(message)
                .setContentIntent(contentIntent);
  
                NotificationManager notificationManager = (NotificationManager)getBaseContext().getSystemService(Context.NOTIFICATION_SERVICE);
                notificationManager.notify(1,builder.build());
           }
           @Override
           protected void onPause() {
                  LocalBroadcastManager.getInstance(this).unregisterReceiver(mRegistrationBroadcastReciever);
                super.onPause();
           }
           @Override
           protected void onResume() {
                super.onResume();
                LocalBroadcastManager.getInstance(this).registerReceiver(mRegistrationBroadcastReciever,new IntentFilter("registration Complete"));
                LocalBroadcastManager.getInstance(this).registerReceiver(mRegistrationBroadcastReciever,new IntentFilter(Config.STR_PUSH));
           }
      }
  </code></pre>
  
  <p><strong>The FirebaseMessagingService</strong></p>
  
  <pre><code>public class MyFirebaseMessagingService extends FirebaseMessagingService{
      @Override
      public void onMessageReceived(RemoteMessage remoteMessage) {
         handleMessage(remoteMessage.getData().get(Config.STR_KEY));
  
      }
  
      private void handleMessage(String message) {
          Intent pushNotification=new Intent(Config.STR_PUSH);
          pushNotification.putExtra(Config.STR_MESSAGE,message);
          LocalBroadcastManager.getInstance(this).sendBroadcast(pushNotification);
  
  
      }
  
  }
  </code></pre>
  
  <p>The Firebase Instance class</p>
  
  <pre><code>public class MyFirebaseIdService extends FirebaseInstanceIdService {
      @Override
      public void onTokenRefresh() {
          super.onTokenRefresh();
          String token = FirebaseInstanceId.getInstance().getToken();
          sendToServer(token);
  
      }
  
      private void sendToServer(String token) {
  
  
      }
  }
  </code></pre>