TaskStackBuilder and extras for the back stack

Question

I\'m trying to use TaskStackBuilder with notifications to create a back stack for the back button to go through. Normal flow of my app:

1. Activity A is launched

Answer 1

This line:

sBuilder.addParentStack( ActivityC.class );

adds all parents declared for ActivityC in AndroidManifest.xml in <meta-data>. I don't know what it is, I haven't used it. I doubt you need it.

This line adds intent to an array:

sBuilder.addNextIntent(launchIntent);

then the array of intents is used to create PendingIntent, probably with PendingIntent.getActivities, I couldn't find the implementation, which is then started somewhere with Context.startActivities.

I think you just need to create set of intents, there you can add extras:

Intent activityA = new Intent(context, ActivityA.class);
activityA.putExtra(key, valueA);
Intent activityB = new Intent(context, ActivityB.class);
activityB.putExtra(key, valueB);
Intent activityC = new Intent(context, ActivityC.class);
activityC.putExtra(key, valueC);

and add them to builder:

sBuilder.addNextIntent(activityA);
sBuilder.addNextIntent(activityB);
sBuilder.addNextIntent(activityC);
pIntent = sBuilder.getPendingIntent( 0, PendingIntent.FLAG_ONE_SHOT );

I haven't tested it, this is only a result of my fast research, I hope someone will correct me if I'm wrong.

Answer 2

I have struggled with this one. My research resulted in the following solution (very similar to @pawelzieba but with one important deletion):

Intent activityA = new Intent(context, ActivityA.class);
activityA.putExtra(key, valueA);
Intent activityB = new Intent(context, ActivityB.class);
activityB.putExtra(key, valueB);
Intent activityC = new Intent(context, ActivityC.class);
activityC.putExtra(key, valueC);

TaskStackBuilder sBuilder = TaskStackBuilder.create(this)
    .addNextIntent(activityA);
    .addNextIntent(activityB);
    .addNextIntent(activityC);
PendingIntent pIntent = sBuilder.getPendingIntent( 0, PendingIntent.FLAG_UPDATE_CURRENT );

Note that you should not modify your manifest with the parent associations, and you do not want to use:

sBuilder.addParentStack( ActivityC.class );

or else you will get repeats of ActivityA and ActivityB in the newly created task that have intents without extras. If you do not need to pass intents with extras, you could add the parent associations in the manifest and call addParentStack().

Answer 3

I found another way to tackle this problem: use the method TaskStackBuilder.editIntentAt(int)

ex.

Intent intentC = new Intent(context, ActivityC.class);
intentC.putExtra(key, valueC);

TaskStackBuilder sBuilder = TaskStackBuilder.create(this)
    .addParentStack(ActivityB.class)
    .addParentStack(ActivityC.class)
    .addNextIntent(intentC);

Intent intentA = sBuilder.editIntentAt(0);
intentA.putExtra(key, value);
Intent intentB = sBuilder.editIntentAt(1);
intentB.putExtra(key, value);