![]() ![]() While in the background, all the activities in the task are stopped, but the back stack for the task remains intact. This group is cohesive and when the user hits the home screen, the entire "task" is moved to the background until the stack is re-activated. Task Stacks EverywhereĪ "task" is a collection of activities stemming from a "root" application. ![]() If the user continues to press Back, then each activity in the stack is popped off to reveal the previous one, until the user returns to whichever task was happening before this task stack began. If the user hits "back", the current activity is popped from the top of the stack (and destroyed) and the previous activity resumes with the previous UI state restored. However, despite being stopped the system retains the state of the Activity UI automatically. ![]() The previous activity remains in the stack but it is stopped. If no task stack exists for this application (first launch recently), then a new task is created and the "main" activity of the app becomes the first (root) item in the stack.Įach time an activity is launched in your app, that activity is pushed onto the top of the stack and becomes active. When an application is launched from the Home Screen, the application comes to the foreground and the "stack" for that application becomes active. By default, your activities in your app are organized as part of the same task affinity group. ![]() The activities are arranged in a stack (the "back stack"), in the order in which each activity is opened. A task is a collection of activities that users interact with when performing a certain job. While the concept of using intents to launch activities should already be familiar to you, let's take a second to explore how launching new activities works and how this navigation is managed.Īs we navigate around our app (or even between apps), Android is maintaining a task stack which tracks each step in the user's history. Note: To skip to changing the behavior of the task stack, jump right to the Usage section of this document. This is typically used in cases where we need to exert more fine-tuned control over the behavior of the task stack which determines the "history" of our application. In this guide, we are going to review tasks, navigation, and how to manipulate these when navigating between activities. The core of navigation flows in Android apps centers around the Activity and the Intent. ![]()
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