- What is a bundle in Android?
- What is the use of SetContentView in Android?
- What is Android app activity?
- What is a fragment in Android?
- What is the difference between onCreate and onStart Android?
- What is getIntent in Android?
- When onPause method is called in Android?
- What is onStart method in Android?
- What is savedInstanceState in Android?
- What does finish () do in Android?
- What is the layout in Android?
- How do I use onRestoreInstanceState on Android?
- How do you use onCreate on Android?
- What is Android application life cycle?
- What are the main components in Android?
What is a bundle in Android?
Android Bundle is used to pass data between activities.
The values that are to be passed are mapped to String keys which are later used in the next activity to retrieve the values..
What is the use of SetContentView in Android?
SetContentView is used to fill the window with the UI provided from layout file incase of setContentView(R. layout. somae_file). Here layoutfile is inflated to view and added to the Activity context(Window).
What is Android app activity?
An activity represents a single screen with a user interface just like window or frame of Java. Android activity is the subclass of ContextThemeWrapper class.
What is a fragment in Android?
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.
What is the difference between onCreate and onStart Android?
onCreate() is called when the when the activity is first created. onStart() is called when the activity is becoming visible to the user.
What is getIntent in Android?
http://developer.android.com/reference/android/app/Activity.html#getIntent() Return the intent that started this activity. If you start an Activity with some data, for example by doing. Intent intent = new Intent(context, SomeActivity. class); intent.
When onPause method is called in Android?
onPause. Called when the Activity is still partially visible, but the user is probably navigating away from your Activity entirely (in which case onStop will be called next). For example, when the user taps the Home button, the system calls onPause and onStop in quick succession on your Activity .
What is onStart method in Android?
The onStart() method runs after the onCreate() method. … After the onStart() method has run, the user can see the activity on the screen. The onStop() method runs when the activity stops being visible to the user. After the onStop() method has run, the activity is no longer visible.
What is savedInstanceState in Android?
The savedInstanceState is a reference to a Bundle object that is passed into the onCreate method of every Android Activity. Activities have the ability, under special circumstances, to restore themselves to a previous state using the data stored in this bundle.
What does finish () do in Android?
Finish() method will destroy the current activity. You can use this method in cases when you dont want this activity to load again and again when the user presses back button. Basically it clears the activity from the. current stack.
What is the layout in Android?
Layouts Part of Android Jetpack. A layout defines the structure for a user interface in your app, such as in an activity. All elements in the layout are built using a hierarchy of View and ViewGroup objects. A View usually draws something the user can see and interact with.
How do I use onRestoreInstanceState on Android?
The onSaveInstanceState() method allows you to add key/value pairs to the outState of the app. Then the onRestoreInstanceState() method will allow you to retrieve the value and set it back to the variable from which it was originally collected.
How do you use onCreate on Android?
onCreate(Bundle) is where you initialize your activity. When Activity is started and application is not loaded, then both onCreate() methods will be called. But for subsequent starts of Activity , the onCreate() of application will not be called. First super.
What is Android application life cycle?
Activity-lifecycle concepts To navigate transitions between stages of the activity lifecycle, the Activity class provides a core set of six callbacks: onCreate() , onStart() , onResume() , onPause() , onStop() , and onDestroy() . The system invokes each of these callbacks as an activity enters a new state.
What are the main components in Android?
There are four main Android app components: activities , services , content providers , and broadcast receivers . Whenever you create or use any of them, you must include elements in the project manifest.