CODEWITHSUNDEEP
androidandroid-serviceandroid-notifications
enzom83
enzom83

Reputation: 8320

Why do notifications make opening another activity instance?

I have an activity which starts a service through a button press. During service initialization, if an error occurs, this error is displayed by a notification, as follows:

String tickerText = getString(R.string.init_error);

Notification notification = new Notification(
        R.drawable.ic_stat_notify_msg,
        tickerText, System.currentTimeMillis());

PendingIntent notificationIntent = PendingIntent.getActivity(
        this, 0, new Intent(this, MyServiceActivity.class), 0);

notification.setLatestEventInfo(this,
        getText(R.string.init_error_tts_title),
        getText(R.string.init_error_tts_text),
        notificationIntent);

NotificationManager nm = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
nm.notify(R.string.init_error, notification);

stopSelf();

When the notification appears in the status bar, I open the notifications window. Then, when I click on the notification, a new instance of MyServiceActivity is launched... Why?

Upvotes: 0

Views: 1633

Answers (3)

R Earle Harris
R Earle Harris

Reputation: 983

I have a music player that has the initial launcher activity, then a selection activity and then the player. The notification needs to return the user to the player. I used Christophe's idea and found that putting 

android:alwaysRetainTaskState="true"
android:launchMode="singleTop"

in the manfest's activity tag of the PLAYER ACTIVITY gave me the correct behavior. Then make sure your notification invokes the PLAYER ACTIVITY class. I didn't do this at first. It invoked the app launcher class and, while this was okay for newer Androids, it left me with the extra activity problem in Android 2.3.6. Now all is good.

If my activity fix doesn't work for you, you'll have to brute-force your way through the choices found at

http://developer.android.com/guide/topics/manifest/activity-element.html#lmode

I should add that my player is stateless, just four buttons connected to a service. But if your activity needs its state set up when the notification's intent comes in, you need to override onNewIntent:

@Override
protected void onNewIntent(Intent intent) {
    super.onNewIntent(intent);
}

Kudos to Christophe. This is a hard question to get the right answer for.

Upvotes: 2

avimak
avimak

Reputation: 1628

set a proper launch mode, or add the required intent flags.

Upvotes: -1

ChristopheCVB
ChristopheCVB

Reputation: 7305

Try to add this attribute on your activity tag on the manifest :

android:launchMode=["multiple" | "singleTop" |
                    "singleTask" | "singleInstance"]

with value singleTop or singleInstance

Activity Element Documentation

Upvotes: 5

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