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I'm having trouble with notifications on Android. I use the code below to generate a notification on the device whenever a GCM message is received by my app. However, it's producing unexpected results.
public class MyGcmListenerService extends GcmListenerService implements Constants {
private static final String TAG = "MyGcmListenerService";
#Override
public void onMessageReceived(String from, Bundle data) {
String message = data.getString("msg");
sendNotification(message);
}
private void sendNotification(String message) {
NotificationManager notificationManager =
(NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
CharSequence name = getString(R.string.gcm_notification_channel_name);
String description = getString(R.string.gcm_notification_channel_description);
int importance = NotificationManager.IMPORTANCE_HIGH;
NotificationChannel channel = new NotificationChannel(GCM_NOTIFICATION_CHANNEL_ID, name,
importance);
channel.setDescription(description);
channel.setLockscreenVisibility(NotificationCompat.VISIBILITY_PUBLIC);
channel.enableVibration(true);
channel.setSound(defaultSoundUri,
new AudioAttributes.Builder()
.setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
.setUsage(AudioAttributes.USAGE_NOTIFICATION_COMMUNICATION_INSTANT)
.build());
notificationManager.createNotificationChannel(channel);
}
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this,
GCM_NOTIFICATION_CHANNEL_ID)
.setContentText(message)
.setContentTitle("My Title")
.setPriority(NotificationCompat.PRIORITY_HIGH)
.setAutoCancel(true)
.setSound(defaultSoundUri)
.setDefaults(Notification.DEFAULT_VIBRATE | Notification.DEFAULT_SOUND)
.setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
.setSmallIcon(R.drawable.ic_notification);
notificationManager.notify(0, notificationBuilder.build());
}
}
If a GCM message is received whilst the app is open (not just running, but actually open on the screen), then the resulting notification has only a title, and doesn't show the message. This screenshot demonstrates this case. Further, if I send multiple GCM messages to the device whilst the app is in the foreground, only one is displayed.
If a message is received whilst the app is either closed or running in the background, the resulting notification shows only the message, and has no title. This screenshot shows the two messages side-by-side - the bottom one was received with the app in the foreground, the top was received with the app in the background. If multiple messages are received whilst the app is in the background, all are displayed (in contrast to what happens when the app is in the foreground). This screenshot shows that multiple messages are displayed when they're received with the app in the background.
Also, the notification only appears as heads-up when the app is in the foreground.
Finally, if received in the foreground, the resulting notification does nothing when tapped. However, if received in the background, the notification opens the app when tapped. Not really bothered by this, just thought it might be indicative of the problem.
FYI: when testing, I tried both keeping the GCM message the same every time, as well as varying it. Both scenarios gave the same result.
What I'd like to figure out:
How to get both the title and message to display regardless of whether app is in foreground or not. This is the most important.
How to get the notification to appear as heads-up when the app is in the background.
Just to pre-empt any responses saying not to abuse heads-up, it's the most important feature of the app (the app must notify users of certain events in real-time), according to our users.
Update:
Bas van Stein's answer allowed me to figure out why the either only the title or message was displayed.
As he correctly pointed out, when the app is in the background, GCM messages are handled by the system. This drove me to inspect the script that is used to send messages by the backend. I realised that the person who wrote this script had sent the message within the title field of the notification field of the GCM message, and there was no body field. So I corrected this issue, and the notifications displayed correctly (for app in background).
This also allowed me to realise that the line String message = data.getString("msg"); in onMessageReceived was returning null. I changed the method as follows:
public void onMessageReceived(String from, Bundle data) {
Bundle notification = data.getBundle("notification");
String title = notification.getString("title");
String message = notification.getString("body");
sendNotification(title, message);
}
Then I added title as a parameter to sendNotification and changed the line that sets the notification title to: .setContentTitle(title). Now notifications are displayed correctly when the app is in the foreground.
Further, I added a static int to the class that I use as the notification ID (incremented every time), so now multiple notifications display correctly.
Still not solved:
I'm still unable to have notifications appear as heads-up when the app is in the background. I tried adding "priority": "high" to the GCM message notification payload, but this had no effect - apparently this is the default for a GCM notification anyway.
This answer will be only a part of the complete solution but here we go:
First issue, the background and foreground notifications seem to be generated by two different functions, you can test this by applying a break point in your code and attach the debugger. You will likely see that the background notification is not triggering the break point in this code. Perhaps you miss a manifest service?
Second issue, that only one notification is being shown is because of this line:
notificationManager.notify(0, notificationBuilder.build());
The 0 here is the notification id, if you create multiple notifications with the same id it will overwrite the notification instead of showing a new one.
Third issue, that the application is not opened on notification tab, is because there is no intent attached to the notification you generate in your code.
You can use something like this for an intent:
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pIntent = PendingIntent.getActivity(this, 0, intent,
PendingIntent.FLAG_ONE_SHOT);
notificationBuilder.setContentIntent(pIntent);
The intent is being called when you click on the notification, this could be any intent so you can open a special activity for example.
Hope this brings you in the correct direction.
i want to make a notification when the app is closed.
Im new to Java and i dont now if a need a service or use AlarmManager.
My idea is to make a txt(in my server) with a number, if is 0 dont make the notifiacion, if is 1 make the notificacion and read all the content of other txt and use that text in the notificacion.
I need to check the txt with the number every 1 hour.
And i need this to happen even if the app is closed.
Thanks
What you want to do is called push messaging I recommend looking at Firebase https://firebase.google.com/docs/cloud-messaging/ or Amazon's implementation.
Services are exactly what you are looking for.
They run in background
Can be started again, even if the application is cleared from recent apps
Can be timed to suit your requirements
Very easy to implement
Here is the official documentation.
And this can be a good start tutorial.
You can use this code for sending notification. But do not forget this, onStop method is also valid for clicking on home and recents button. So, whenever you click on home or recents button, a notification will pop up. You can improve this code by listening home and recents button.
public void onStop() {
NotificationCompat.Builder notificationBuilder = (NotificationCompat.Builder) new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.icon24)
.setContentTitle("App Closed")
.setContentText("You've closed the app")
.setTicker("You've closed the app")
.setAutoCancel(true)
.setLargeIcon(BitmapFactory.decodeResource(getApplicationContext().getResources(), R.drawable.icon96))
.setDefaults(Notification.DEFAULT_ALL);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
notificationBuilder.setPriority(Notification.PRIORITY_HIGH);
}
NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(0, notificationBuilder.build());
super.onStop();
}
I need a program that will add a notification on Android. And when someone clicks on the notification, it should lead them to my second activity.
I have established code. The notification should be working, but for some reason it is not working. The Notification isn't showing at all. I don't know what am I missing.
Code of those files:
Notification n = new Notification.Builder(this)
.setContentTitle("New mail from " + "test#gmail.com")
.setContentText("Subject")
.setContentIntent(pIntent).setAutoCancel(true)
.setStyle(new Notification.BigTextStyle().bigText(longText))
.build();
NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
// Hide the notification after it's selected
notificationManager.notify(0, n);
The code won't work without an icon. So, add the setSmallIcon call to the builder chain like this for it to work:
.setSmallIcon(R.drawable.icon)
Android Oreo (8.0) and above
Android 8 introduced a new requirement of setting the channelId property by using a NotificationChannel.
NotificationManager mNotificationManager;
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(mContext.getApplicationContext(), "notify_001");
Intent ii = new Intent(mContext.getApplicationContext(), RootActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(mContext, 0, ii, 0);
NotificationCompat.BigTextStyle bigText = new NotificationCompat.BigTextStyle();
bigText.bigText(verseurl);
bigText.setBigContentTitle("Today's Bible Verse");
bigText.setSummaryText("Text in detail");
mBuilder.setContentIntent(pendingIntent);
mBuilder.setSmallIcon(R.mipmap.ic_launcher_round);
mBuilder.setContentTitle("Your Title");
mBuilder.setContentText("Your text");
mBuilder.setPriority(Notification.PRIORITY_MAX);
mBuilder.setStyle(bigText);
mNotificationManager =
(NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE);
// === Removed some obsoletes
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
{
String channelId = "Your_channel_id";
NotificationChannel channel = new NotificationChannel(
channelId,
"Channel human readable title",
NotificationManager.IMPORTANCE_HIGH);
mNotificationManager.createNotificationChannel(channel);
mBuilder.setChannelId(channelId);
}
mNotificationManager.notify(0, mBuilder.build());
Actually the answer by ƒernando Valle doesn't seem to be correct. Then again, your question is overly vague because you fail to mention what is wrong or isn't working.
Looking at your code I am assuming the Notification simply isn't showing.
Your notification is not showing, because you didn't provide an icon. Even though the SDK documentation doesn't mention it being required, it is in fact very much so and your Notification will not show without one.
addAction is only available since 4.1. Prior to that you would use the PendingIntent to launch an Activity. You seem to specify a PendingIntent, so your problem lies elsewhere. Logically, one must conclude it's the missing icon.
You were missing the small icon.
I did the same mistake and the above step resolved it.
As per the official documentation:
A Notification object must contain the following:
A small icon, set by setSmallIcon()
A title, set by setContentTitle()
Detail text, set by setContentText()
On Android 8.0 (API level 26) and higher, a valid notification channel ID, set by setChannelId() or provided in the NotificationCompat.Builder constructor when creating a channel.
See http://developer.android.com/guide/topics/ui/notifiers/notifications.html
This tripped me up today, but I realized it was because on Android 9.0 (Pie), Do Not Disturb by default also hides all notifications, rather than just silencing them like in Android 8.1 (Oreo) and before. This doesn't apply to notifications.
I like having DND on for my development device, so going into the DND settings and changing the setting to simply silence the notifications (but not hide them) fixed it for me.
Creation of notification channels are compulsory for Android versions after Android 8.1 (Oreo) for making notifications visible. If notifications are not visible in your app for Oreo+ Androids, you need to call the following function when your app starts -
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 = getString(R.string.channel_name);
String description = getString(R.string.channel_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 behaviours after this
NotificationManager notificationManager =
getSystemService(NotificationManager.class);
notificationManager.createNotificationChannel(channel);
}
}
You also need to change the build.gradle file, and add the used Android SDK version into it:
implementation 'com.android.support:appcompat-v7:28.0.0'
This worked like a charm in my case.
I think that you forget the
addAction(int icon, CharSequence title, PendingIntent intent)
Look here: Add Action
I had the same issue with my Android app. I was trying out notifications and found that notifications were showing on my Android emulator which ran a Android 7.0 (Nougat) system, whereas it wasn't running on my phone which had Android 8.1 (Oreo).
After reading the documentation, I found that Android had a feature called notification channel, without which notifications won't show up on Oreo devices. Below is the link to official Android documentation on notification channels.
Notifications Overview, Notification anatomy
Create and Manage Notification Channels
For me it was an issue with deviceToken. Please check if the receiver and sender device token is properly updated in your database or wherever you are accessing it to send notifications.
For instance, use the following to update the device token on app launch. Therefore it will be always updated properly.
// Device token for push notifications
FirebaseInstanceId.getInstance().getInstanceId().addOnSuccessListener(
new OnSuccessListener<InstanceIdResult>() {
#Override
public void onSuccess(InstanceIdResult instanceIdResult) {
deviceToken = instanceIdResult.getToken();
// Insert device token into Firebase database
fbDbRefRoot.child("user_detail_profile").child(currentUserId).child("device_token")).setValue(deviceToken)
.addOnSuccessListener(
new OnSuccessListener<Void>() {
#Override
public void onSuccess(Void aVoid) {
}
});
}
});
I encountered a similar problem to yours and while searching for a solution I found these answers but they weren't as direct as I hoped they would be but it gives an Idea; Your notifications may not be showing because for versions >=8 notifications are done relatively differently there is a NotificationChannel which aids in managing notifications this helped me. Happy coding.
void Note(){
//Creating a notification channel
NotificationChannel channel=new NotificationChannel("channel1",
"hello",
NotificationManager.IMPORTANCE_HIGH);
NotificationManager manager=(NotificationManager) getSystemService(NOTIFICATION_SERVICE);
manager.createNotificationChannel(channel);
//Creating the notification object
NotificationCompat.Builder notification=new NotificationCompat.Builder(this,"channel1");
//notification.setAutoCancel(true);
notification.setContentTitle("Hi this is a notification");
notification.setContentText("Hello you");
notification.setSmallIcon(R.drawable.ic_launcher_foreground);
//make the notification manager to issue a notification on the notification's channel
manager.notify(121,notification.build());
}
Make sure your notificationId is unique. I couldn't figure out why my test pushes weren't showing up, but it's because the notification ids were generated based on the push content, and since I was pushing the same notification over and over again, the notification id remained the same.
Notifications may not be shown if you show the notifications rapidly one after the other or cancel an existing one, then right away show it again (e.g. to trigger a heads-up-notification to notify the user about a change in an ongoing notification). In these cases the system may decide to just block the notification when it feels they might become too overwhelming/spammy for the user.
Please note, that at least on stock Android (tested with 10) from the outside this behavior looks a bit random: it just sometimes happens and sometimes it doesn't. My guess is, there is a very short time threshold during which you are not allowed to send too many notifications. Calling NotificationManager.cancel() and then NotificationManager.notify() might then sometimes cause this behavior.
If you have the option, when updating a notification don't cancel it before, but just call NotificationManager.notify() with the updated notification. This doesn't seem to trigger the aforementioned blocking by the system.
If you are on version >= Android 8.1 (Oreo) while using a Notification channel, set its importance to high:
int importance = NotificationManager.IMPORTANCE_HIGH;
NotificationChannel channel = new NotificationChannel(CHANNEL_ID, name, importance);
val pendingIntent = PendingIntent.getActivity(applicationContext, 0, Intent(), 0)
var notification = NotificationCompat.Builder(applicationContext, CHANNEL_ID)
.setContentTitle("Title")
.setContentText("Text")
.setSmallIcon(R.drawable.icon)
.setPriority(NotificationCompat.PRIORITY_HIGH)
.setContentIntent(pendingIntent)
.build()
val mNotificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
mNotificationManager.notify(sameId, notification)
I am able to create notifications. Currently when a user gets a friend request, it says "New friend request from someUsername". However, if the user receives multiple friend requests, I want to update the text to say "New friend requests."
From my understanding, I just have to change the text using the same Builder object I used to create the initial notification.
My idea was to create a HashMap mapping all the IDs used in NotificationManager's notify( int id, Builder builder ) to the Builder objects.
When a notification is clicked, the notification disappears (due to my use of setAutoCancel(true) ), however, I don't know how to detect this so I can remove the Builder object from the HashMap as well.
The reason I would like to remove the Builder object is because when the HashMap's get(id) method returns null, I'll know to display "New friend request from " instead of "New friend requests".
If my algorithm is over-complicated, by all means correct me. Otherwise, how can I detect when a notification is canceled?
Side note: I plan on doing this same thing for messages and possibly other kinds of notifications.
In case it's needed, this is my function that creates the notifications (the id is hardcoded for now):
private void triggerNotification(String content, Context context) {
Log.i("Thread", "notification triggered");
NotificationCompat.Builder builder =
new NotificationCompat.Builder(context)
.setSmallIcon(R.drawable.ic_launcher)
.setContentTitle("Anime Chatter")
.setContentText( content );
builder.setAutoCancel( true );
Intent i = new Intent(context, Friends.class);
PendingIntent contentIntent = PendingIntent.getActivity(context, 0, i, 0);
builder.setContentIntent(contentIntent);
NotificationManager mNotificationManager = (NotificationManager) context.getSystemService( Context.NOTIFICATION_SERVICE );
mNotificationManager.notify( 1010, builder.build());
}
The most solid way to go at this is to create a dedicated table to deal with notifications.
That may be too much work, but it's how the biggest apps deal with notifications - which has been seen and which hasn't etc.
For a more simple approach just add some code in your activity, when dealing with the intent, that tracks the last notification clicked in a persistent way (SharedPrefs?) so that whatever controller is dispatching the notifications knows if there should be more than one notification to be seen or not (for example if the user dismisses a notification without clicking on it, there is still more than one friend request he doesnt know about). This controller should also keep track of the last sent notification (SharedPrefs again). This way when the controller dispatches the notification it can compare the last sent and the last clicked and see if there is only one, or several.
Seems pretty straight forward to me. Can help you with code if needed.
What you're looking for is Notification.Builder#setDeleteIntent(PendingIntent).
The pending intent you set here (you should wrap a Broadcast Intent) will be fired when the notification is canceled by the user. You can respond to the broadcast and update your persistent storage (db, shared prefs, whatever) where you're keeping track of active notifications to determine what you should show when the next one comes in.
I want to create an android app
that will send the device location after the app's installation
and every 15 minutes
What is the best way to do so?
1) I can create a timer inside the App's main Activity.
but then it will be stopped when the app is on the background. So I understand I have to create a service.
But then, how do I register it to work from device start up (after turning the device on and forever after)?
2) I saw this push notification tutorial, I think it doesn't fit my needs as the server sends the notification in broadcast, no?
I want different notifications to users based on their current location.
I want the user to actively send GPS location and then receive custom push to his location
(GEO based push notification)
Would you use something like the guy answered here?
If you want to do something on a time-based interval, I suggest looking into AlarmManager:
Alarms (based on the AlarmManager class) give you a way to perform time-based operations outside the lifetime of your application.
http://developer.android.com/training/scheduling/alarms.html
You can start the service by making a broadcast Receiver which listens to boot completed. Then start service in it. As far as getting location every 15 minutes is concerned you can use following code to get location every 15 minutes :-
locationManager.requestLocationUpdates(usedLocationService, updateTime, updateDistance, this);
replace updateTime with 90000 for 15 minutes. You should implement locationManager in your service.
If you are using google map android api, then there is a interface calls
locationOnChange(LatLng points), this will be called every X min or sec ( X is defined by you ), that bascially gets your current location at giving LatLng point. Then if I was you, I would use NotificationManager to push the notification with the updated point to my phone
Here is the code I would do for this.
//At OnCreate
mLocationClient = new LocationClient(this, this, this);
mLocationRequest = LocationRequest.create();
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
mLocationRequest.setInterval(UPDATE_INTERVAL);
mLocationRequest.setFastestInterval(FASTEST_INTERVAL);
mLocationClient.requestLocationUpdates(mLocationRequest, this)
//Google Map interface
#Override
public void onLocationChanged(Location location)
//inside I would use the notificationManager to push the location
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(
context).setSmallIcon(R.drawable.btn_star)
.setContentTitle("My notification~~~~")
.setContentText("Hello World!~~~~")
.setStyle(new NotificationCompat.BigTextStyle().bigText(s));
NotificationManager mNotificationManager = (NotificationManager) context
.getSystemService(Context.NOTIFICATION_SERVICE);
mNotificationManager.notify(123, mBuilder.build());