nsaholiday.blogg.se - Android studio fragment activity cycle

OnDestroyView: This method is called before OnDestroy, it is used when you need to clean fragment view objects before destroy.When removing the current fragment or replace the current fragment with another fragment. OnStop: This fragment is going to be stopped.Such as when removing the current fragment or replace the current fragment with another fragment. OnPause: This method is called when the fragment will be left.

OnResume: This method is called just after OnStart or when the fragment is popup from the back stack, it means the fragment is running again.

OnStart: This method is invoked when the fragment is started until it is visible and ready to interact with the user.

If you need to do some work after the activity creates in your fragment, you can add those codes here. The activity’s OnCreate method has been finished.

OnActivit圜reated: Activity is created.

OnCreateView: Fragment view is created, this method will return a view object which is generally the fragment’s root layout view object.

OnAttach: Fragment is attached to the activity.

Activity adds fragment use FragmentTransaction‘s add or replace method.

Below are the introduction of the activity fragment lifecycle callback methods.

The below diagram shows fragment lifecycle callback methods for each state.

The fragment view object does not add into the activity content view directly, this is different from adding other view objects in an activity.

Then the fragment’s view object will be added into the activity’s viewGroup.

When an activity adds a fragment to it, it will get a reference of the fragment’s view.FragmentTransaction‘s remove(), replace() method can also make a fragment runs into the destroy state when you do not call the addToBackStack() method to add the fragment to the back stack. Destroy State: When an activity is destroyed, it’s child fragment is destroyed also.A stopped fragment is invisible, it can be recycled by the android OS. FragmentTransaction‘s remove(), replace() method can also make a fragment runs into the stop state. Stop State: When an activity is stopped, its related fragments are stopped also.This activity-related fragment is paused also. Pause State: If an activity is paused because another not-full-screen activity is displayed at the top of the back stack.Running State: Fragment is visible, its belonged activity is running.