How to bring an activity to foreground top of stack

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

User · Answer

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;
}

User · Answer

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

User · Answer

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

User · Answer

You can try this FLAG ACTIVITY REORDER TO FRONT  the document describes exactly what you want to

User · Answer

i setFlags Intent FLAG ACTIVITY BROUGHT TO FRONT    Note Your homeactivity launchmode should be single task

User · Answer

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

User · Answer

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

User · Answer

I think a combination of Intent flags should do the trick  In particular  Intent FLAG ACTIVITY CLEAR TOP and Intent FLAG ACTIVITY NEW TASK   Add these flags to your intent before calling startActvity

User · Answer

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

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

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