CODEWITHSUNDEEP
androidandroid-activityinstancenotifications
user375418
user375418

Reputation: 271

Prevent new activity instance after clicking on notification

application (non-wanted) behavior -

  1. application is started, some text is put into text-box and notification is created through button action.
  2. user "clicks" the home button, application is "minimized", notification is available in bar
  3. user selects the notification and the application is "maximized"

BUT - instead of the original instance, new instance is started (e.g. in the newest instance is missing the original text; when the latest instance is closed there is still the original instance with original text ) .

the code of the notification method

Context context = getApplicationContext();
    CharSequence contentTitle = "someText1";
    CharSequence contentText = "someText2";
    Intent notifyIntent = new Intent(Intent.ACTION_MAIN);
    notifyIntent.setClass(getApplicationContext(), RadioStream.class);
    PendingIntent intent = 
       PendingIntent.getActivity(RadioStream.this, 0, notifyIntent, 0);

    notifyDetails.setLatestEventInfo(context, contentTitle, contentText, intent);
    mNotificationManager.notify(SIMPLE_NOTFICATION_ID, notifyDetails);

i have also in the manifest xml file following tag

android:launchMode="singleTask"

but it is still the same... The main problem is double/triple initialization of the application, i know that there are other means to preserve the values in resumed applications. Also it is needed that the applications stays running in background as the main functionality is the streaming of internet radio.

What is missing in the code ? What kind of information from my side is missing for to troubleshoot the issue ?

Thanks!

Dav

Upvotes: 26

Views: 13860

Answers (9)

Metu
Metu

Reputation: 1093

This will bring the app back to its MainActivity even if it has opened child activities. Child activities are also cleared.

AndroidManifest:

android:launchMode="singleTop"

Code:

val intent = Intent(context, MainActivity::class.java)
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP or Intent.FLAG_ACTIVITY_SINGLE_TOP)
val pendingIntent = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT)

Upvotes: 1

Happy Mittal
Happy Mittal

Reputation: 129

It is working for me by using below combination.

1) add launch mode in Manifest file android:launchMode="singleInstance"

2) set setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP) while creating intent.

intent = new Intent(this, StartUpActivity.class); intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP| Intent.FLAG_ACTIVITY_SINGLE_TOP);

Upvotes: 0

Juan Pablo
Juan Pablo

Reputation: 1223

I used GCM example as base code for a personal project and I faced the same issue described on top. GCM Example: https://github.com/googlesamples/google-services/tree/master/android/gcm/app/src/main/java/gcm/play

I found a solution by combining to answers:

1) From @ognian answer, by adding to App Manifest on application section:

android:launchMode="singleTop"

<application
    android:allowBackup="true"
    android:icon="@mipmap/logo"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme"
    **android:launchMode="singleInstance">**

2) From @CommonsWare by setting setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP)

private void sendNotification(String message) {
    Intent intent = new Intent(this, MainActivity.class);
    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP| Intent.FLAG_ACTIVITY_SINGLE_TOP);
    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent,
            PendingIntent.FLAG_ONE_SHOT);

Upvotes: 0

Shlomi Fresko
Shlomi Fresko

Reputation: 929

You can set PendingIntent.FLAG_CANCEL_CURRENT on the PendingIntent:

PendingIntent pIntent = PendingIntent.getActivity(this, 0, intent,
            PendingIntent.FLAG_CANCEL_CURRENT);

If the activity already exists,The new one will cancel and not update the old one! This works for me!

Upvotes: 2

Sushant Patekar
Sushant Patekar

Reputation: 473

instead of :

notifyIntent.setClass(getApplicationContext(), RadioStream.class);
PendingIntent intent =   PendingIntent.getActivity(RadioStream.this, 0, notifyIntent, 0);

simply use these lines,it will helps you,

notifyIntent = new Intent();
PendingIntent intent= PendingIntent.getActivity(RadioStream.this, 0, notifyIntent, 0);

Upvotes: -2

Tek Yin
Tek Yin

Reputation: 3050

add this flag to your activity properties.

android:launchMode="singleInstance"

Upvotes: 4

user375418
user375418

Reputation: 271

reimplemented as service - everything works as expected

Upvotes: 1

CommonsWare
CommonsWare

Reputation: 1006654

Another option is to use setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP) on your Intent.

Upvotes: 15

ognian
ognian

Reputation: 11541

What you refer as "application" is most probably an Activity. To avoid re-crating it when bringing up to front, use

android:launchMode="singleTop"

To have some code running background, you need to realize it as Service

Upvotes: 24

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