What is singleTask?

“singleTask” The system creates a new task and instantiates the activity at the root of the new task. However, if an instance of the activity already exists in a separate task, the system routes the intent to the existing instance through a call to its onNewIntent() method, rather than creating a new instance.

What is launchMode singleTask?

If you look at androids documentation it says. ” A “singleTask” activity allows other activities to be part of its task. It’s always at the root of its task, but other activities (necessarily “standard” and “singleTop” activities) can be launched into that task.”

What is single top?

An Activity with singleTask launchMode is allowed to have only one instance in the system (a.k.a. Singleton). If there is an existed Activity instance in the system, the whole Task hold the instance would be moved to top while Intent would be delivered through onNewIntent() method.

What is the difference between a fragment and an activity?

Activity is an application component that gives a user interface where the user can interact. The fragment is only part of an activity, it basically contributes its UI to that activity. Fragment is dependent on activity. After using multiple fragments in a single activity, we can create a multi-screen UI.

What is Android launchMode singleInstance?

singleInstance This is very special launch mode and only used in the applications that has only one activity. It is similar to singleTask except that no other activities will be created in the same task. Any other activity started from here will create in a new task.

Which method should you use to start a sub activity?

Just create an Intent (with a reference to the sub-Activity class), and call startActivity(intent, correlationId) and this will launch the sub-Activity.

What is singleton class in Android?

A singleton is a design pattern that restricts the instantiation of a class to only one instance. Notable uses include controlling concurrency and creating a central point of access for an application to access its data store. This example demonstrate about How to use singleton class in android.

What is finishAffinity Android?

finishAffinity() is not used to “shutdown an application”. It is used to remove a number of Activity s belonging to a specific application from the current task (which may contain Activity s belonging to multiple applications).

Why do we use fragments?

According to the Android documentation, a fragment is a part of applications user interface that is bound to an activity. Fragments help enrich your UI design, pass data between different screens, and adapt to different device configurations. Unlike activities, fragments are usable.

What’s the difference between singletask and singleinstance in Android?

It’s always at the root of its task, but other activities (necessarily “standard” and “singleTop” activities) can be launched into that task. A “singleInstance” activity, on the other hand, permits no other activities to be part of its task. It’s the only activity in the task.

Is there ever more than one singletask in the stack?

As noted above, there’s never more than one instance of a “singleTask” or “singleInstance” activity, so that instance is expected to handle all new intents. A “singleInstance” activity is always at the top of the stack (since it is the only activity in the task), so it is always in position to handle the intent.

What happens when a task is launched in singleinstance?

In singleInstance, a new Task is launched and that cannot contain other activities. If a task with activity A declared as singleTask exists in the background, and a foreground activity calls activity A, then the entire task of activity A is placed on top of the activity.

Which is the best Android app for multitasking?

Activity is one of the most brilliant concept on Android from its well-design architecture on memory management which lets Multitasking works perfectly on this most popular mobile operating system. Anyway, Activity is not just to be launched on the screen.

What is singleTask? “singleTask” The system creates a new task and instantiates the activity at the root of the new task. However, if an instance of the activity already exists in a separate task, the system routes the intent to the existing instance through a call to its onNewIntent() method, rather than creating a new…