What is the difference between getActivity and getContext?
getContext() – Returns the context view only current running activity. getActivity()- Return the Activity this fragment is currently associated with. getActivity() can be used in a Fragment for getting the parent Activity of the Fragment .
Table of Contents
What is the difference between context and requireContext?
getContext() returns a nullable Context . requireContext() returns a nonnull Context , or throws an exception when one isn’t available.
What does getContext return in Android?
getContext():
It returns the Context which is linked to the Activity from which it is called. This is useful when we want to call the Context from only the current running activity.
Do fragments have their own context?
Fragments can’t exist on their own; they require activity or other fragments. The fragment’s layout, lifecycle, and input events are managed and defined by themselves. The interaction between fragment objects is managed by the fragment manager class.
What is the difference between getContext () getApplicationContext () getBaseContext () and this?
Show activity on this post. getApplicationContext() – Returns the context for all activities running in application. getBaseContext() – If you want to access Context from another context within application you can access. getContext() – Returns the context view only current running activity.
Why onActivityCreated is deprecated?
Need for onActivityCreated() deprecation
In such similar fashion android developers saw the tight coupling of code dependent to the Activity’s life cycle. And they decided that it is not a good practice anymore to be dependent on the activity attach to do certain things inside the fragment.
What is the difference between onCreate () and onCreateView () lifecycle methods in fragment?
onCreate is called on initial creation of the fragment. You do your non graphical initializations here. It finishes even before the layout is inflated and the fragment is visible. onCreateView is called to inflate the layout of the fragment i.e graphical initialization usually takes place here.
Why is getContext null in a fragment?
If it’s invoked when your fragment is not attached to activity, getContext() will return null. The ideal solution here is to Cancel the request when the activity/fragment is not active (like user pressed back button, or minimized the app).
What is the difference between activity and Context?
An Application context lasts, as long as your app is alive, while the Activity context dies with your Activity (it is not valid after onDestroy of that Activity).
What is difference between onViewCreated and onCreateView?
onCreate() is called to do initial creation of the fragment. onCreateView() is called by Android once the Fragment should inflate a view. onViewCreated() is called after onCreateView() and ensures that the fragment’s root view is non-null .
What is difference between activity Context and Applicationcontext?
Application Context: It is the application and we are present in Application. For example – MyApplication(which extends Application class). It is an instance of MyApplication only. Activity Context: It is the activity and we are present in Activity.
What are the differences between onCreate () onCreateView () and onActivityCreated () in fragments and what would they each be used for?
onCreate(Bundle) called to do initial creation of the fragment. onCreateView(LayoutInflater, ViewGroup, Bundle) creates and returns the view hierarchy associated with the fragment. onActivityCreated(Bundle) tells the fragment that its activity has completed its own Activity.
What are retained fragments?
A Fragment represents a reusable portion of your app’s User Interface. Retained Fragment consists of the configuration change that causes the underlying Activity to be destroyed. The term “retained” refers to the fragment that will not be destroyed on configuration changes.
What is getActivity?
getActivity() in a Fragment returns the Activity the Fragment is currently associated with. (see http://developer.android.com/reference/android/app/Fragment.html#getActivity()). getActivity() is user-defined.
What is the difference between activity context and ApplicationContext?
What is the difference between onCreate () and onCreateView () LifeCycle methods in fragment?
What is difference between onCreateView and onViewCreated in fragment?
onCreateView() is called by Android once the Fragment should inflate a view. onViewCreated() is called after onCreateView() and ensures that the fragment’s root view is non-null .
Why do we need to call setContentView () in onCreate () of activity class?
onCreate() method calls the setContentView() method to set the view corresponding to the activity. By default in any android application, setContentView point to activity_main. xml file, which is the layout file corresponding to MainActivity.
What is the difference between onCreateView and onViewCreated in fragment?
However, onCreateView() is called first and should only be used to inflate the fragment’s view. onViewCreated() is called second and all logic pertaining to operations on the inflated view should be in this method.
What is the purpose of addToBackStack () while commiting fragment transaction?
addToBackStack. Add this transaction to the back stack. This means that the transaction will be remembered after it is committed, and will reverse its operation when later popped off the stack.
What is onAttach in fragment?
The onAttach() callback is invoked when the fragment has been added to a FragmentManager and is attached to its host activity. At this point, the fragment is active, and the FragmentManager is managing its lifecycle state. At this point, FragmentManager methods such as findFragmentById() return this fragment.
What is getActivity () in android?
getActivity() is used for fragment . For activity , wherever you can use this , you can replace the this in fragment in similar cases with getActivity() . Show activity on this post. getActivity()- Return the Activity this fragment is currently associated with.
Can I start activity with application context?
The main difference between Application and Activity Context is that Application Context is not related to UI. That means we shouldn’t use application context for inflate a layout, start activity nor show an dialog.
What is the difference between onPause and onResume?
The onResume() method runs after the onStart() method. It gets called when the activity is about to move into the foreground. After the onResume() method has run, the activity has the focus and the user can interact with it. The onPause() method runs when the activity stops being in the foreground.
What is the difference between commit and commitNow ()?
The former only executes the current transaction synchronously, whereas the latter will execute all of the transactions you have committed and are currently pending. commitNow() prevents you from accidentally executing more transactions than you actually want to execute.