Reputation: 18027

How to bring an activity to foreground (top of stack)?

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?

Upvotes: 96

Answers (10)

GreatJohn

Reputation: 59

If you use adb am cmd for start，you should use cmd like below

adb shell am start -n com.xxx.xxx/com.xxx.Activity --activity-reorder-to-front

adb intent argument

adb intend -f argument descript

Upvotes: 0

sakis kaliakoudas

Reputation: 2089

If you want to bring an activity to the top of the stack when clicking on a Notification then you may need to do the following to make the FLAG_ACTIVITY_REORDER_TO_FRONT work:

The solution for me for this was to make a broadcast receiver that listens to broadcast actions that the notification triggers. So basically:

Notification triggers a broadcast action with an extra the name of the activity to launch.
Broadcast receiver catches this when the notification is clicked, then creates an intent to launch that activity using the FLAG_ACTIVITY_REORDER_TO_FRONT flag
Activity is brought to the top of activity stack, no duplicates.

Upvotes: 0

sujith s

Reputation: 914

i.setFlags(Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT);

Note Your homeactivity launchmode should be single_task

Upvotes: 2

GFPF

Reputation: 949

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!

Upvotes: -2

FunGapApp

Reputation: 195

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);

Upvotes: 13

greg7gkb

Reputation: 5030

The best way I found to do this was to use the same intent as the Android home screen uses - the app Launcher.

For example:

Intent i = new Intent(this, MyMainActivity.class);
i.setAction(Intent.ACTION_MAIN);
i.addCategory(Intent.CATEGORY_LAUNCHER);
startActivity(i);

This way, whatever activity in my package was most recently used by the user is brought back to the front again. I found this useful in using my service's PendingIntent to get the user back to my app.

Upvotes: 67

Jan-Terje Sørensen

Reputation: 14698

Here is a code-example of how you can do it:

Intent intent = getIntent(getApplicationContext(), A.class)

This will make sure that you only have one instance of an activity on the stack.

private static Intent getIntent(Context context, Class<?> cls) {
    Intent intent = new Intent(context, cls);
    intent.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
    return intent;
}

Upvotes: 29

Segfault

Reputation: 8290

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

Upvotes: 1