Question: What Is The Difference Between GetActivity And GetContext?

How do you identify a fragment?

A fragment resembles a sentence in two ways.

Both groups of words begin with a capital letter and conclude with an end mark—usually a period [.] but sometimes a question mark [?] or an exclamation point [!].

The one important difference is that a fragment does not contain a main clause..

What is an example of a fragment?

Definition of a Sentence Fragment Sentence fragments are groups of words that look like sentences, but aren’t. … An independent clause is any group of words that contain both a subject and a verb and can stand on its own. For example, ‘I like cheeseburgers’ is an independent clause.

How many ways can you call a fragment?

There are three ways a fragment and an activity can communicate: Bundle – Activity can construct a fragment and set arguments.

What is a fragment in English?

Fragments are incomplete sentences. Usually, fragments are pieces of sentences that have become disconnected from the main clause. One of the easiest ways to correct them is to remove the period between the fragment and the main clause. Other kinds of punctuation may be needed for the newly combined sentence.

How do you handle onBackPressed fragments?

As the Fragment lifecycle do not have onBackPressed() ….1 – Create Interface. interface IOnBackPressed { fun onBackPressed(): Boolean }2 – Prepare your Activity. class MyActivity : AppCompatActivity() { override fun onBackPressed() { val fragment = this. … 3 – Implement in your target Fragment.

How do I remove a fragment from a Backstack if already exists?

For this you can set addToBackStack to fragment transation and then call commit. By calling addToBackStack(), the replace transaction is saved to the back stack so the user can reverse the transaction and bring back the previous fragment by pressing the Back button.

What is FragmentManager?

A FragmentManager manages Fragments in Android, specifically it handles transactions between fragments. A transaction is a way to add, replace, or remove fragments.

How can I add two fragments in one activity?

Two fragments in one activityFuncitonality of the Two Fragments Application. The UI for the first fragment will contain an EditText view and a Button and the second fragment will contain a TextView object. … Creating the Project. … Adding the Android Support Library. … Creating the First Fragment Layout. … Creating the Second Fragment Layout.

Why does getActivity return null?

When getActivity returns null it means that the Fragment is not attached to the Activity. Most commonly this happens when the Activity has gone away due to rotation or the Activity being finished but the Fragment still has some kind of callback listener registered.

How do you end a fragment?

getFragmentManager(). popBackStack(); And it can close the fragment. So, when you press back-key, the current activity (which holds multiple fragments) will load previous fragment rather than finishing itself.

Why do you need an empty constructor in a fragment?

TL;DR A class used to control the instantiation of Fragment instances. Traditionally, a Fragment instance could only be instantiated using its default empty constructor. This is because the system would need to reinitialize it under certain circumstances like configuration changes and the app’s process recreation.

What is the fragment life cycle in Android?

A fragment can be used in multiple activities. Fragment life cycle is closely related to the life cycle of its host activity which means when the activity is paused, all the fragments available in the activity will also be stopped. A fragment can implement a behaviour that has no user interface component.

Does fragment have context?

Always use the getActivity() method to get the context of your attached activity, but always remember one thing: Fragments are slightly unstable and getActivity returns null some times, so for that, always check the isAdded() method of fragment before getting context by getActivity() .

What is getBaseContext in Android?

getBaseContext() is the method of ContextWrapper . And ContextWrapper is, “Proxying implementation of Context that simply delegates all of its calls to another Context. Can be subclassed to modify behavior without changing the original Context.” (as per javadocs)..

Which method is called only once in a fragment lifecycle?

3 Answers. onCreate and onDestroy id fired only once. onCreate: Called when the activity is first created. This is where you should do all of your normal static set up: create views, bind data to lists, etc…

How do you handle back press in fragment?

Android – handle back press in FragmentBaseFragment. The first step to create back-sensitive fragments is to define the interface that we can call to notify particular fragments about back-press. … BaseActivity. The next step is an activity with the overwritten Activity. … MyFragment. The last step is to implement such back-sensitive fragment.

What is the context of a fragment in Android?

getActivity() is normally used in fragments to get the context of the activity in which they are inserted or inflated. You can use getActivity() , which returns the activity associated with a fragment. The activity is a context (since Activity extends Context).

How do you kill an activity?

9 Answers. You can also add android:noHistory=”true” to your Activity tag in AndroidManifest. xml . Yes, all you need to do is call finish() in any Activity you would like to close.

What is difference between context and activity?

7 Answers. They are both instances of Context, but the application instance is tied to the lifecycle of the application, while the Activity instance is tied to the lifecycle of an Activity. … The Activity context presumably has some information about the current activity that is necessary to complete those calls.

Which is better activity or fragment?

If using with Fragment for UI View, it may be more good in performance but reliability (such as : manually maintaining data states while rotation with Activity and Fragment each other, but if used Activity it will more less custom maintenance) is more sure for using Fragment ?

What is difference between fragment and FragmentActivity?

So FragmentActivity is exactly as a simple Activity only it gives you the ability to add Fragment to it. Fragment is an object that shares parts of the Activity life cycle and can be added as part of you UI to an Activity or FragmentActivity with it’s logic.

What is the difference between this and getApplicationContext?

this refers to the MainActivity context which extends Activity class but the base class ( Activity ) also extends Context class, so it can be used to offer activity context. getBaseContext() offers activity context. getApplication() offers application context. getApplicationContext() also offers application context.

What is a fragment activity?

Fragments Part of Android Jetpack. A Fragment represents a behavior or a portion of user interface in a FragmentActivity . You can combine multiple fragments in a single activity to build a multi-pane UI and reuse a fragment in multiple activities.

Why do we use fragments in Android?

A fragment is an independent Android component which can be used by an activity. A fragment encapsulates functionality so that it is easier to reuse within activities and layouts. A fragment runs in the context of an activity, but has its own life cycle and typically its own user interface.

What is getApplicationContext?

Application Context It is an instance that is the singleton and can be accessed in activity via getApplicationContext() . … The application context can be used where you need a context whose lifecycle is separate from the current context or when you are passing a context beyond the scope of activity.

What is fragment and give examples?

A fragment is a group of words that does not express a complete thought. It is not a complete sentence, but it could be a phrase. Examples of Fragment: the boy on the porch. to the left of the red car.

How do I know if a fragment is attached?

Use isAdded() to check whether the fragment is attached and then to getResources() from activity.