Android activity back stack?
You can start your fifth activity with the FLAG_ACTIVITY_CLEAR_TOP flag.
The flow of activity is A -> B -> C -> A -> B -> C -> A . Whenever I come back to activity A I want to finish all other activity. Is FLAG_ACTIVITY_CLEAR_TOP work?
If yes then please let me know the syntax. Thanks – rock Jul 29 at 8:26 Assuming you are in Activity C, if you now start Activity A like this: Intent intent = new Intent(this, ActivityA. Class) .
SetFlags(Intent. FLAG_ACTIVITY_CLEAR_TOP); startActivity(int? Ent); Then all activities but A are killed as soon as A is started.
– iDroid Jul 29 at 8:54 is there any way to finish all activity in activity A? – rock Jul 29 at 9:24 Afaik there is no method like clearActivityStack() to clear the whole stack from a certain activity, if you mean that. You can wether clear the history on launching a new activity with the flag like already mentioned or you can end the activity manually by calling finish().
Also take a look at this reference, it countains all available flags and methods for handling activities. – iDroid Jul 29 at 9:37.
What you want is essentially being able to end application from any other activity different from the first one. What I do is using an application variable determining if application must be shutdown and then check it on the onresume method. Protected void onResume() { super.onResume(); if (!getMyApplication().
IsPlatformActive()) { /* We finish every activity after resuming if we must shutdown application */ finish(); } } boolean isRootScreen() { /* Every activity will override this and set it to true if want to exit application from here */ return false; } protected void onBackPressed() { if(isRootScreen()) { /* You could show a confirmation dialog here */ getMyApplication(). SetPlatformActive(false); } super.onBackPressed(); }.
Its task goes into the background. The system retains the state of every activity in the task. To the foreground and resumes the activity at the top of the stack.
The previous activity in the stack is resumed. Does not retain the activity's state. Activities can be instantiated multiple times, even from other tasks.
The way they left it. When this happens, information about the activity state is lost. Top of the stack the system must recreate it (rather than resume it).
Methods in your activity. With tasks or how they exist in the back stack. The normal behavior.
Activities except for the root activity when the user leaves the task. Manifest element and with flags in the intent that you pass to startActivity(). Flags to define how activities are associated with tasks and how the behave in the back stack.
Behavior for activities and tasks. Launch and when navigating back to it from other activities and tasks with the Back button. To test for navigation behaviors that might conflict with the user's expected behavior.
Should associate with tasks when it starts. Whether) the new activity should associate with the current task. B should associate with current task.
Over Activity B's request (as defined in its manifest). For an intent cannot be defined in the manifest. Element's launchMode attribute.
Always open in its own task—by specifying the singleTask launch mode in the element. Task as your application. Started it, the Back button always takes the user to the previous activity.
That activity exists in a background task, that whole task is brought to the foreground. Figure 4 illustrates this type of scenario. Launch mode "singleTask" is added to the back stack.
Forward, on top of the current task. By including flags in the intent that you deliver to startActivity(). The affinity indicates which task an activity prefers to belong to.
Activities from the same application have an affinity for each other. Activities in the same application prefer to be in the same task. The default affinity for an activity.
Assigned different task affinities. Affinity for the application. When the intent that launches an activity contains the FLAG_ACTIVITY_NEW_TASK flag.
That called startActivity(). Back stack as the caller. Flag, the system looks for a different task to house the new activity.
Often, it's a new task. However, it doesn't have to be. New activity, the activity is launched into that task.
If not, it begins a new task. It, there must be some way for the user to navigate back to the task. They always put FLAG_ACTIVITY_NEW_TASK in the intents they pass to startActivity().
Has a CATEGORY_LAUNCHER intent filter; see the Starting a task section below). When an activity has its allowTaskReparenting attribute set to "true". For, when that task comes to the foreground.
Defined as part of a travel application.
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