How to bring an activity to foreground (top of sta

Question

In Android, I defined an activity ExampleActivity.

When my application was launched, an instance of this A-Activity was created, say it is A. When user clicked a button in A, another instance of B-Activity, B was created. Now the task stack is B-A, with B at the top. Then, user clicked a button on B, another instance of C-Activity, and C was created. Now the task stack is C-B-A, with C at the top.

Now, when user click a button on C, I want the application to bring A to the foreground, i.e. make A to be at the top of task stack, A-C-B.

How can I write the code to make it happen?

Answer 1

FLAG_ACTIVITY_REORDER_TO_FRONT: If set in an Intent passed to Context.startActivity(), this flag will cause the launched activity to be brought to the front of its task's history stack if it is already running.

Intent i = new Intent(context, AActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
startActivity(i);

Answer 2

if you are using the "Google Cloud Message" to receive push notifications with "PendingIntent" class, the following code displays the notification in the action bar only.

Clicking the notification no activity will be created, the last active activity is restored retaining current state without problems.

Intent notificationIntent = new Intent(this, ActBase.class); **notificationIntent.setAction(Intent.ACTION_MAIN); notificationIntent.addCategory(Intent.CATEGORY_LAUNCHER);** PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);

NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this) .setSmallIcon(R.drawable.ic_launcher) .setContentTitle("Localtaxi") .setVibrate(vibrate) .setStyle(new NotificationCompat.BigTextStyle().bigText(msg)) .setAutoCancel(true) .setOnlyAlertOnce(true) .setContentText(msg);

mBuilder.setContentIntent(contentIntent);

NotificationManager mNotificationManager = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);

mNotificationManager.notify(NOTIFICATION_ID, mBuilder.build());

Ciao!

Answer 3

In general I think this method of activity management is not recommended. The problem with reactivating an activity two Steps down in The Stack is that this activity has likely been killed. My advice into remember the state of your activities and launch them with startActivity ()

I'm sure you've Seen this page but for your convenience this link