Develop Reference

Why must you use Intent.setAction and Intent.AddCategory to use singleTop with PendingIntent?

I'm using example code to create a notification, which I then want to handle in onNewIntent() if my App is already running. However, onNewIntent() was not being called. I searched for a few hours and no one seemed to have a proper answer--just some workarounds.
I had to search forever to find the solution here: Android OnNewIntent not called and the answer is not actually explained.
Question
Can anyone explain why we need the lines:
resultIntent.setAction(Intent.ACTION_MAIN);
resultIntent.addCategory(Intent.CATEGORY_LAUNCHER);
in order to receive the notification through onNewIntent()? The App launches just fine without them, but will always go through onCreate() instead.
Example Code
public void createNotification(String s){
// The id of the channel.
String CHANNEL_ID = "my_channel_01";
NotificationCompat.Builder mBuilder =
(NotificationCompat.Builder) new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.icon_missing)
.setContentTitle(getString(R.string.notification_channel_name))
.setContentText(R.string.text);
// Creates an explicit intent for an Activity in your app
Intent resultIntent = new Intent(this, MainActivity.class);
resultIntent.setAction(Intent.ACTION_MAIN);
resultIntent.addCategory(Intent.CATEGORY_LAUNCHER);
// The stack builder object will contain an artificial back stack for the
// started Activity.
// This ensures that navigating backward from the Activity leads out of
// your app to the Home screen.
TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
// Adds the back stack for the Intent (but not the Intent itself)
stackBuilder.addParentStack(MainActivity.class);
// Adds the Intent that starts the Activity to the top of the stack
stackBuilder.addNextIntent(resultIntent);
PendingIntent resultPendingIntent =
stackBuilder.getPendingIntent(
0,
PendingIntent.FLAG_UPDATE_CURRENT
);
mBuilder.setContentIntent(resultPendingIntent);
NotificationManager mNotificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
// mNotificationId is a unique integer your app uses to identify the
// notification. For example, to cancel the notification, you can pass its ID
// number to NotificationManager.cancel().
Notification n = mBuilder.build();
n.flags = n.flags | Notification.FLAG_AUTO_CANCEL;
mNotificationManager.notify(1, n);
}

How to schedule notification in android after application exit?

I am working on an application in which a notification has to fired after some time. The code for firing a notification is in a method. I want to execute this method after some time the application has been exited. I tried Alarm Manager, it runs fine but it needs an intent. I don't want to show an activity , I just want to show notification in status bar. Is there any other way to do this? The method I want to run is fireNotification. Using Alarm Manager seems logical but It can fire an Intent not a method. I need some way to run this method when application is not running.
private void fireNotification(long Id, String Title)
{
//Define sound URI
Uri soundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(this)
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle(Title)
.setContentText("Tap here to view")
.setSound(soundUri)
.setAutoCancel(true);
Intent resultIntent = new Intent(this, ViewActivity.class);
resultIntent.putExtra("noteId", noteId);
TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
// Adds the back stack
stackBuilder.addParentStack(ViewNoteActivity.class);
// Adds the Intent to the top of the stack
stackBuilder.addNextIntent(resultIntent);
// Gets a PendingIntent containing the entire back stack
PendingIntent resultPendingIntent =
stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);
mBuilder.setContentIntent(resultPendingIntent);
// Sets an ID for the notification
int mNotificationId = safeLongToInt(safeLongToInt(Id));
// Gets an instance of the NotificationManager service
NotificationManager mNotifyMgr =
(NotificationManager) getSystemService(NOTIFICATION_SERVICE);
// Builds the notification and issues it.
mNotifyMgr.notify(mNotificationId, mBuilder.build());
}
public static int safeLongToInt(long l) {
if (l < Integer.MIN_VALUE || l > Integer.MAX_VALUE) {
throw new IllegalArgumentException
(l + " cannot be cast to int without changing its value : Notification ID.");
}
return (int) l;
}

android notifications won't run .notify

I'm trying to send an android notification but it keeps failing at the mbuilder.build() part. I do have an alert dialog right after in the same method. I'm posting my code below
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.noteiconcon)
.setContentTitle("Finished search")
.setContentText("We found your account");
System.out.println("failed after setText");
// Creates an explicit intent for an Activity in your app
Intent resultIntent = new Intent(this, MainActivity.class);
System.out.println("failed after result intent");
// The stack builder object will contain an artificial back stack for the
// started Activity.
// This ensures that navigating backward from the Activity leads out of
// your application to the Home screen.
TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
System.out.println("taskstackbuilder passed");
stackBuilder.addParentStack(MainActivity.class);
System.out.println("stackbuilder.appParentstack passed");
stackbuilder.addNextIntent(resultIntent);
System.out.println("stackbuilder.addnextintent passed");
PendingIntent resultPendingIntent =
stackBuilder.getPendingIntent(
0,
PendingIntent.FLAG_UPDATE_CURRENT
);
System.out.println("pending intent passed");
mBuilder.setContentIntent(resultPendingIntent);
System.out.println("mbuilder.setcontentintent passed");
NotificationManager mNotificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
System.out.println("notification manager passed");
// mId allows you to update the notification later on.
mNotificationManager.notify(mId,mBuilder.build());
System.out.println("notificationManager.notify passed"+ mId);
I already added the meta data task but the log cat says.
Bogus static initialization, type 4 in field type Landroid/support/v4/app/NotificationCompat$NotificationCompatImpl; for Landroid/support/v4/app/NotificationCompat; at index 1
Like I said I added the meta data tag and this is being called in an asychtask after an alert dialog. Ive commented out the alert dialog but it still works.
If I drop the last line .notify it doesn't crash but obviously doesn't send a notification.

I had to use a different notification method which it accepted the notification then.
// Set the icon, scrolling text and timestamp
NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
String MyText = "Finished searching";
Notification mNotification = new Notification(R.drawable.passicon, MyText, System.currentTimeMillis() );
//The three parameters are: 1. an icon, 2. a title, 3. time when the notification appears
String MyNotificationTitle = "Finished Searching";
String MyNotificationText = "We can't find your password.";
Intent MyIntent = new Intent(this, MainActivity.class);
PendingIntent StartIntent = PendingIntent.getActivity(getApplicationContext(),0,MyIntent, PendingIntent.FLAG_CANCEL_CURRENT);
//A PendingIntent will be fired when the notification is clicked. The FLAG_CANCEL_CURRENT flag cancels the pendingintent
mNotification.setLatestEventInfo(getApplicationContext(), MyNotificationTitle, MyNotificationText, StartIntent);
int NOTIFICATION_ID = 1;
notificationManager.notify(NOTIFICATION_ID , mNotification);
//We are passing the notification to the NotificationManager with a unique id.

keep posting the same notification

I am trying to post a notification on a button press using this code:
public void onClick(View v) {
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_launcher)
.setContentTitle("My notification")
.setContentText("Hello World!");
// Creates an explicit intent for an Activity in your app
Intent resultIntent = new Intent(this, MainActivity.class);
// The stack builder object will contain an artificial back stack for the
// started Activity.
// This ensures that navigating backward from the Activity leads out of
// your application to the Home screen.
TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
// Adds the back stack for the Intent (but not the Intent itself)
stackBuilder.addParentStack(MainActivity.class);
// Adds the Intent that starts the Activity to the top of the stack
stackBuilder.addNextIntent(resultIntent);
PendingIntent resultPendingIntent =
stackBuilder.getPendingIntent(
0,
PendingIntent.FLAG_UPDATE_CURRENT
);
mBuilder.setContentIntent(resultPendingIntent);
NotificationManager mNotificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
// mId allows you to update the notification later on.
i = (int) Math.random();
mNotificationManager.notify(i, mBuilder.build());
}
and I know the .notfiy(id, notification) allow it to only post one notification with the same ID but just for the sake of this example app i would like to keep being able to post notifications even it it is the same one. Thats why i tried to use a random number so it would switch the id, but that still didnt help. Any suggestions?
by the way this is posting a notification, but only one until i clear it

Use a global int 'i=0' and increment it after every notification creation and change code like following
public void onClick(View v) {
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_launcher)
.setContentTitle("My notification")
.setContentText("Hello World!");
// Creates an explicit intent for an Activity in your app
Intent resultIntent = new Intent(this, MainActivity.class);
// The stack builder object will contain an artificial back stack for the
// started Activity.
// This ensures that navigating backward from the Activity leads out of
// your application to the Home screen.
TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
// Adds the back stack for the Intent (but not the Intent itself)
stackBuilder.addParentStack(MainActivity.class);
// Adds the Intent that starts the Activity to the top of the stack
stackBuilder.addNextIntent(resultIntent);
i++;
PendingIntent resultPendingIntent =
stackBuilder.getPendingIntent(
i,
PendingIntent.FLAG_UPDATE_CURRENT
);
mBuilder.setContentIntent(resultPendingIntent);
NotificationManager mNotificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
// mId allows you to update the notification later on.
mNotificationManager.notify(i, mBuilder.build());
}
Hope this will resolve the issue

How to send multiply push-notifications and show number of them

I have a server with some data and in my app I want to show this data via push-notification, so the problem is I didn't get how to cooperate notification number in status bar with my notifiсations. In my app I get notifications as ArrayList from my server. For each notification I should use a "Notification builder", in which I'll put notify fields like icon, name, desc etc, and at least I should call "NotificationManager.notify" for each of them, but how I can show that I've just gotten 3 messages for example in my status bar(one icon with indicator of 3, NOT 3 icons), and don't multiply a notification sound, but still show all of them when I open a status bar.
My code:
public void sendNotifications(ArrayList<Message> messages){
int notifyID = 0;
mNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
for(Message message:messages){
Intent notificationIntent = new Intent(getApplicationContext(), MainActivity.class);
PendingIntent contentIntent = PendingIntent.getActivity(getApplicationContext(),0, notificationIntent,
PendingIntent.FLAG_CANCEL_CURRENT);
Resources res = getApplicationContext().getResources();
Notification.Builder builder = new Notification.Builder(getApplicationContext());
builder.setContentIntent(contentIntent)
.setSmallIcon(R.drawable.ic_launcher)
.setLargeIcon(BitmapFactory.decodeResource(res, messages.media))
.setTicker("Got a new message")
.setWhen(System.currentTimeMillis())
.setAutoCancel(true)
.setContentTitle(message.titile)
.setContentText(message.text);
Notification notification = builder.getNotification();
mNotificationManager.notify(notifyID, notification);
notifyID++;
}
}
UPD
For more understanding what i want to i've added an images
-pic1 When i send notifications - icon shows me how much i got
-pic2 When i opened a status bar it shows me all my notifies
It is possible to do that?

You cannot do that - Combine 3 notification into one.
Either you create a single notification combining all the notifications or like this only.
It is not necessary that you will get 3 notifications. You can get 1 or 2 also.
I don't see the issue here. If there are 3 notifications, you will see 3 icons in the status bar.
Each icon represents an entry in the pull down notification bar- having one icon represent multiple entries wouldn't really make sense.

Notification.Builder has method setNumber to set number of notifications. It's described in Notification docs in Updating notifications section.

You can use Big view notification.
Check here : Notifications

Notification Id must be a constant. If notification id is different it will show as different notifications. So your code must be like this, declare ID and count as field variable:
public static final int NOTIFICATION_ID = 1;
private int notificationCount = 1;
and change the method like this:
public void sendNotifications(ArrayList<Message> messages){
int notifyID = 0;
mNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
for(Message message:messages){
Intent notificationIntent = new Intent(getApplicationContext(), MainActivity.class);
TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
// Adds the back stack
stackBuilder.addParentStack(MainActivity.class);
// Adds the Intent to the top of the stack
stackBuilder.addNextIntent(notificationIntent);
// Gets a PendingIntent containing the entire back stack
PendingIntent contentIntent = stackBuilder.getPendingIntent(0,
PendingIntent.FLAG_CANCEL_CURRENT);
Resources res = getApplicationContext().getResources();
Notification.Builder builder = new Notification.Builder(getApplicationContext());
builder.setContentIntent(contentIntent)
.setSmallIcon(R.drawable.ic_launcher)
.setLargeIcon(BitmapFactory.decodeResource(res, messages.media))
.setTicker("Got a new message")
.setWhen(System.currentTimeMillis())
.setAutoCancel(true)
.setContentTitle(message.titile)
.setContentText(message.text);
.setNumber(notificationCount++);
mNotificationManager.notify(NOTIFICATION_ID, builder.build());
}
}
Thanks