Develop Reference

PendingIntent resume activity

I have an Android activity that places a Notification in the status bar. Selecting the notification will launch my main activity. The problem is that this PendingIntent always starts a new instance of my activity "MyappMain". So when i start my app by clicking on the notification, i get an new instance of the MyappMain and then i must quit/finish them all one by one (if I clicked multiple times on the notification).
Intent notificationIntent = new Intent(this, MyappMain.class);
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);
notification.setLatestEventInfo(context, contentTitle, contentText, contentIntent);
mNotificationManager.notify(HELLO_ID, notification);

Please add finish(); before you start a new Intent, this way your current activity will be finished and new one will be started.

You have to set the "FLAG_ACTIVITY_REORDER_TO_FRONT" flag.
notificationIntent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);

Flagging issues in android

I'm trying to get my Notification to not cancel when the user presses "Clear All" So far I have the intent working properly on everything except this:
Intent intent = new Intent(getBaseContext(), MainActivity.class);
intent.addFlags(Notification.FLAG_ONGOING_EVENT);
intent.addFlags(Notification.FLAG_NO_CLEAR);
PendingIntent contentIntent = PendingIntent.getActivity(
getBaseContext(), 0, intent, 0);
The question I have at this point is: Are my flags correct?

Yes, your flags look pretty much correct, although I don't know if you even need the FLAG_NO_CLEAR. I currently have an app which creates an ongoing (non-cancellable) notification - I only use the FLAG_ONGOING_EVENT and it works fine for me. I pretty much just copied it from a tutorial and then added the ongoing event flag.
Here's some sample code:
String text = "notification";
Notification notification = new Notification(R.drawable.icon, text,
System.currentTimeMillis());
//launch the activity if the user selects this notification
PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
new Intent().setComponent(ComponentName.unflattenFromString("com.example/com.example.MyActivity")), 0);
// set the label and text...
notification.setLatestEventInfo(this, getText(R.string.notification_label),
text, contentIntent);
notification.flags = Notification.FLAG_ONGOING_EVENT;
// Send the notification.
// We use a string id because it is a unique number. We use it later to cancel.
NotificationManager mNM;
mNM.notify(R.string.notification_label, notification);

How to listen onClick event for notififation bar on Android?

Well, I have a simple notification. But when I tap it in Notification bar, I just get opened my app. So how can I know that my app was opened by notification tap or how can I open a specific Activity after tapping?

There is no onClick event on a notification. It is merely launching a prepackaged PendingIntent that is attached to THAT specific notification object.

I think you have this code in Statusbar Notification. When you click the Notification Item, the following Intent is called.
Context context = ctx.getApplicationContext();
Intent notificationIntent = new Intent(ctx, ctx.getClass());
PendingIntent contentIntent = PendingIntent.getActivity(ctx, 0, notificationIntent, 0);
notification.setLatestEventInfo(context, contentTitle, contentText, contentIntent);
If you want specific Activity to be opened, call the particular Class in the above Intent

How to write a notification that does absolutly nothing when clicked?

Ive seen many examples of how to make something happen when the user clicks on a notification but I actually don't want anything to happen. If the user clicks on the notification I want the notification to simply dissapear and the user NOT taken anywhere.
In my code below, while FLAG_AUTO_CANCEL clears the notification from the status bar, when the user clicks on a my notification they are taken to "MyActivity".
How can I create a notification that does nothing?
Notification notification = new Notification(R.drawable.success, res.getString(R.string.messages_sent), System.currentTimeMillis());
//Define the expanded message and intent
Context context = getApplicationContext();
CharSequence contentTitle = res.getString(R.string.messages_sent_ellipsis);
Intent notificationIntent = new Intent(this, MyActivity.class);
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0 );
notification.setLatestEventInfo(context, contentTitle, mStrSuccessMessage, contentIntent);
notification.flags |= Notification.FLAG_AUTO_CANCEL;
//Pass the notification to the notification manager
mNotificationManager.notify(1, notification);

Changing
Intent notificationIntent = new Intent(this, MyActivity.class);
to
Intent notificationIntent = new Intent();
would do the job. The gist is if you want nothing, give it a blank intent.

Android Notification message (doesn't) switch from activity

I was trying to switch from tabview (those took about 1/3rd of a small screen) to fullscreens selectable via notification messages.
So far so good, everything done following the instructions on many howto's its all working like a charm. (that is on the sdk emulator)
now i've transfered the app to my actual android telephone and now it doesn't switch the screens anymore via the notifications. it ALWAYS opens the MainActivity.
private void DroiDCNotification(int NotificationID, CharSequence tickerText, CharSequence contentTitle, CharSequence contentText) {
//throw new UnsupportedOperationException("Not yet implemented");
String ns = Context.NOTIFICATION_SERVICE;
NotificationManager mNotificationManager = (NotificationManager) getSystemService(ns);
int icon = R.drawable.droidc_icon; // icon from resources
long when = System.currentTimeMillis(); // notification time
Context context = getApplicationContext(); // application Context
Intent notificationIntent = new Intent(this, MainActivity.class);
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);
// the next two lines initialize the Notification, using the configurations above
Notification notification = new Notification(icon, tickerText, when);
notification.setLatestEventInfo(context, contentTitle, contentText, contentIntent);
mNotificationManager.notify(NotificationID, notification);
}
So how can i make the notification called by a specific Activity open that specified Activity?

I was trying to switch from tabview (those took about 1/3rd of a small screen) to fullscreens selectable via notification messages.
I have no idea why you think that this is a good idea. Notifications are not designed for this role. Please use an options menu.
So how can i make the notification called by a specific Activity open that specified Activity?
It is going to execute the PendingIntent. Your PendingIntent wraps an Intent identifying MainActivity.class. If you do want it to use MainActivity.class, change MyActivity.class to whatever class you wish.

Hi Just use this twolines in yr activity
Intent notificationIntent = new Intent(context, SamplePushActivity.class);
PendingIntent intent = PendingIntent.getActivity(context, 0, notificationIntent, android.content.Intent.FLAG_ACTIVITY_NEW_TASK);