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error: cannot find symbol method getSystemService(Class<NotificationManager>)

I get this code from google android developer website, but I'm not sure why I'm getting this error. First I did this in my MainActivity and it works fine, and then I created another at AlarmReceiver.java but error occurred.
error: cannot find symbol method getSystemService(Class)
public class AlarmReceiver extends BroadcastReceiver{
private final String CHANNEL_ID = "Notification";
#Override
public void onReceive(Context context, Intent intent) {
createNotificationChannel();
Intent notificationIntent = new Intent(context, MapsActivity.class);
TaskStackBuilder stackBuilder = TaskStackBuilder.create(context);
stackBuilder.addParentStack(MapsActivity.class);
stackBuilder.addNextIntent(notificationIntent);
PendingIntent pendingIntent = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);
NotificationCompat.Builder builder = new NotificationCompat.Builder(context);
Notification notification = builder.setContentTitle("Demo App Notification")
.setContentText("New Notification From Demo App..")
.setTicker("New Message Alert!")
.setSmallIcon(R.mipmap.ic_launcher)
.setContentIntent(pendingIntent).build();
NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(0, notification);
}
private void createNotificationChannel(){
// Create the NotificationChannel, but only on API 26+ because
// the NotificationChannel class is new and not in the support library
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
CharSequence name = "NOTIFICATION";
String description = "DESCRIPTION";
int importance = NotificationManager.IMPORTANCE_DEFAULT;
NotificationChannel channel = new NotificationChannel(CHANNEL_ID, name, importance);
channel.setDescription(description);
// Register the channel with the system; you can't change the importance
// or other notification behaviors after this
NotificationManager notificationManager = getSystemService(NotificationManager.class);
notificationManager.createNotificationChannel(channel);
}
}
}

Failed to post notification on channel “null”

I have an App which can send notifications to the users but since the new PlayStore Updates needs to match targetSdkVersion 26 the notifications dont work anymore with the error toast Failed to post notification on channel “null”. There are some threads about it but i didnt get the solution. Here is my actual FirebaseMessagingService class:
public class FirebaseMessagingService extends com.google.firebase.messaging.FirebaseMessagingService {
#Override
public void onMessageReceived(RemoteMessage remoteMessage) {
super.onMessageReceived(remoteMessage);
String notification_title = remoteMessage.getNotification().getTitle();
String notification_message = remoteMessage.getNotification().getBody();
String click_action = remoteMessage.getNotification().getClickAction();
String from_user_id = remoteMessage.getData().get("from_user_id");
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(this)
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle(notification_title)
.setContentText(notification_message);
Intent resultIntent = new Intent(click_action);
resultIntent.putExtra("user_id", from_user_id);
PendingIntent resultPendingIntent =
PendingIntent.getActivity(
this,
0,
resultIntent,
PendingIntent.FLAG_UPDATE_CURRENT
);
mBuilder.setContentIntent(resultPendingIntent);
int mNotificationId = (int) System.currentTimeMillis();
NotificationManager mNotifyMgr =
(NotificationManager) getSystemService(NOTIFICATION_SERVICE);
mNotifyMgr.notify(mNotificationId, mBuilder.build());
}
}
What do I need to change to make it working again? It would be good if it also works for devices from sdk 24 up.

Since Android Oreo, you need a Channel to send your notifications.
You can do something like this (not tested) :
public class FirebaseMessagingService extends com.google.firebase.messaging.FirebaseMessagingService {
public static final String NOTIFICATION_CHANNEL_ID = "10001";
#Override
public void onMessageReceived(RemoteMessage remoteMessage) {
super.onMessageReceived(remoteMessage);
String notification_title = remoteMessage.getNotification().getTitle();
String notification_message = remoteMessage.getNotification().getBody();
String click_action = remoteMessage.getNotification().getClickAction();
String from_user_id = remoteMessage.getData().get("from_user_id");
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(this)
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle(notification_title)
.setContentText(notification_message);
Intent resultIntent = new Intent(click_action);
resultIntent.putExtra("user_id", from_user_id);
PendingIntent resultPendingIntent =
PendingIntent.getActivity(
this,
0,
resultIntent,
PendingIntent.FLAG_UPDATE_CURRENT
);
mBuilder.setContentIntent(resultPendingIntent);
int mNotificationId = (int) System.currentTimeMillis();
NotificationManager mNotifyMgr =
(NotificationManager) getSystemService(NOTIFICATION_SERVICE);
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O)
{
int importance = NotificationManager.IMPORTANCE_HIGH;
NotificationChannel notificationChannel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, "NOTIFICATION_CHANNEL_NAME", importance);
mBuilder.setChannelId(NOTIFICATION_CHANNEL_ID);
mNotifyMgr.createNotificationChannel(notificationChannel);
}
mNotifyMgr.notify(mNotificationId, mBuilder.build());
}
}

Calling a notification in onReceive of broadcast receiver

public class MyBroadcaseciver extends BroadcastReceiver {
MediaPlayer mymedia;
#Override
public void onReceive(Context context, Intent intent) {
mymedia=MediaPlayer.create(context,R.raw.alarm);
mymedia.start();
Toast.makeText(context, "Alarm....", Toast.LENGTH_LONG).show();
}
}
The code above is my broadcast receiver, which plays a song when it fires. This is working as expected, however I wish to call a push notification to pop here and also my notification isn't working here.
Notification.Builder bulider = new Notification.Builder(this)
.setContentTitle("Rainfall Alert")
.setContentText("Todays Rain");
Notification notification = bulider.build();
NotificationManager manager = (NotificationManager)
getSystemService(Context.NOTIFICATION_SERVICE);
manager.notify(0,notification);
Help is appreciated.

public void sendNotification(String title, String body, Intent intent,int pushid) {
Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(context)
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle(title)
.setStyle(new NotificationCompat.BigTextStyle()
.bigText(body))
.setContentText(body)
.setAutoCancel(true)
.setSound(defaultSoundUri);
if(intent!=null) {
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent,
PendingIntent.FLAG_ONE_SHOT);
notificationBuilder.setContentIntent(pendingIntent);
}
NotificationManager notificationManager =
(NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(0, notificationBuilder.build());
}
call this funcation in onrecive method
Intent intent = new Intent(context, Mainscreen.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
sendNotification("title","message", intent, 0);

public class MyBroadcaseciver extends BroadcastReceiver {
MediaPlayer mymedia;
#Override
public void onReceive(Context context, Intent intent) {
mymedia=MediaPlayer.create(context,R.raw.alarm);
mymedia.start();
Toast.makeText(context, "Alarm....", Toast.LENGTH_LONG).show();
Intent intent = new Intent(context, Mainscreen.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
sendNotification("title","message", intent, 0);
}
public void sendNotification(String title, String body, Intent intent,int pushid) {
Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(context)
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle(title)
.setStyle(new NotificationCompat.BigTextStyle()
.bigText(body))
.setContentText(body)
.setAutoCancel(true)
.setSound(defaultSoundUri);
if(intent!=null) {
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent,
PendingIntent.FLAG_ONE_SHOT);
notificationBuilder.setContentIntent(pendingIntent);
}
NotificationManager notificationManager =
(NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(0, notificationBuilder.build());
}
}

How to know when push is opened; Azure Push Notifications Notification Hub?

I have implemented push notifications using Azure's Notification Hub. I have noticed that they only have three override methods when extending NotificationHandler:
public void onReceive(Context context, Bundle bundle)
public void onUnregistered(Context context, String gcmRegistrationId)
public void onRegistered(Context context, String gcmRegistrationId)
Most push notification services have an onPushOpen() or onOpen() callback method which is called when a user presses on the push notification they received. How do I know when someone has clicked on the received push notification? I am experimenting with the demo. Everything works minus the concern I have said.
Link: https://github.com/Azure/azure-notificationhubs-samples/blob/master/Android/GetStartedFirebase/app/src/main/java/com/example/microsoft/getstartednh/MyHandler.java
public class MyHandler extends NotificationsHandler {
public static final int NOTIFICATION_ID = 1;
private NotificationManager mNotificationManager;
NotificationCompat.Builder builder;
Context ctx;
#Override
public void onReceive(Context context, Bundle bundle) {
ctx = context;
String nhMessage = bundle.getString("message");
sendNotification(nhMessage);
if (MainActivity.isVisible) {
MainActivity.mainActivity.ToastNotify(nhMessage);
}
}
private void sendNotification(String msg) {
Intent intent = new Intent(ctx, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
mNotificationManager = (NotificationManager)
ctx.getSystemService(Context.NOTIFICATION_SERVICE);
PendingIntent contentIntent = PendingIntent.getActivity(ctx, 0,
intent, PendingIntent.FLAG_ONE_SHOT);
Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(ctx)
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle("Notification Hub Demo")
.setStyle(new NotificationCompat.BigTextStyle()
.bigText(msg))
.setSound(defaultSoundUri)
.setContentText(msg);
mBuilder.setContentIntent(contentIntent);
mNotificationManager.notify(NOTIFICATION_ID, mBuilder.build());
}
}

For anyone else trying to figure this out, it is actually pretty simple. In the sendNotification() method, whatever information you want to keep track of when the push notification is opened add it as extras to your intent. For example.
private void sendNotification(String msg) {
Intent intent = new Intent(ctx, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
// seeking to do something specific when notification is opened if flag is set
intent.putExtra("onPushOpen", "performSomeAction");
mNotificationManager = (NotificationManager)
ctx.getSystemService(Context.NOTIFICATION_SERVICE);
PendingIntent contentIntent = PendingIntent.getActivity(ctx, 0,
intent, PendingIntent.FLAG_ONE_SHOT);
Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(ctx)
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle("Notification Hub Demo")
.setStyle(new NotificationCompat.BigTextStyle()
.bigText(msg))
.setSound(defaultSoundUri)
.setContentText(msg);
mBuilder.setContentIntent(contentIntent);
mNotificationManager.notify(NOTIFICATION_ID, mBuilder.build());
}
Now that you have done this. In onResume() check for that information. It will be empty (null) when push notification is not invoked, otherwise, it will have your information.
Bundle b = getIntent().getExtras();
// now retrieve what you want from the bundle.

Notification Does Not Open Intent

When I click on the notification that pops up it doesn't open BaseApplication.class. What am I doing wrong here? I want the notification to open BaseApplication.class
public static void sendBasicNotification(int minor, int major, String task) {
Intent notifyIntent = new Intent(currentContext, BaseApplication.class);
notifyIntent.putExtra("t", task);
notifyIntent.putExtra("ma", major);
notifyIntent.putExtra("mi", minor);
notifyIntent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
PendingIntent pendingIntent = PendingIntent.getActivities(currentContext, 0, new Intent[] { notifyIntent },
PendingIntent.FLAG_UPDATE_CURRENT);
int notificationID = 21;
NotificationCompat.Builder builder = new NotificationCompat.Builder(currentContext)
.setContentText("You have started the task: " + task).setContentTitle("Task Alert")
.setSmallIcon(R.drawable.ic_launcher).setAutoCancel(true).setContentIntent(pendingIntent)
.setWhen(System.currentTimeMillis()).setDefaults(Notification.DEFAULT_ALL);
Notification notification = builder.getNotification();
NotificationManager notificationManager = getNotificationManager(currentContext);
notificationManager.notify(notificationID, notification);
}
static NotificationManager getNotificationManager(Context context) {
return (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
}

Turns out I was sending the intent to the wrong class. Thanks all, fixed now. That code works just fine.

try adding this line
notifyIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | FLAG_ACTIVITY_SINGLE_TOP);

private void sendNotification(String msg) {
Log.d(TAG, "Preparing to send notification...: " + msg);
mNotificationManager = (NotificationManager) this
.getSystemService(Context.NOTIFICATION_SERVICE);
PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
new Intent(this, MainActivity.class), 0);
// MainActivity is the Notification Intent that open by intent
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(
this).setSmallIcon(R.drawable.ic_launcher)
.setContentTitle("Application name")
.setStyle(new NotificationCompat.BigTextStyle().bigText(msg))
.setContentText(msg);
mBuilder.setContentIntent(contentIntent);
mNotificationManager.notify(NOTIFICATION_ID, mBuilder.build());
Log.d(TAG, "Notification sent successfully.");
}
hope it will work