Explanation: An activity is a single screen in android. It is like a window or frame of Java. By the help of activity, you can place all your UI components or widgets in a single screen.
What is an activity in Android?
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. If you have worked with C, C++ or Java programming language then you must have seen that your program starts from main() function.
Is it possible to have activity without UI to perform action actions?
Q 1 – Is it possible to have an activity without UI to perform action/actions? Generally, every activity is having its UI(Layout). But if a developer wants to create an activity without UI, he can do it.
What is the life cycle of foreground activity in Android * Mcq?
There are three key lifecycle methods that deal with when an activity becomes visible or invisible to the user. These methods are onStart() , onStop() , and onRestart() . Just as with onCreate() and onDestroy() , your activity inherits them from the Android Activity class.
What is the life cycle of foreground activity in Android?
Activity Lifecycle
| Lifecycle Method | Description |
|---|---|
| onCreate() | The activity is starting (but not visible to the user) |
| onStart() | The activity is now visible (but not ready for user interaction) |
| onResume() | The activity is now in the foreground and ready for user interaction |
What is Android activity with example?
Android Activity Lifecycle methods
| Method | Description |
|---|---|
| onCreate | called when activity is first created. |
| onStart | called when activity is becoming visible to the user. |
| onResume | called when activity will start interacting with the user. |
| onPause | called when activity is not visible to the user. |
What is activity and its lifecycle?
Activity in Android is one of the most important components of Android. It is the Activity where we put the UI of our application. So, if we are new to Android development then we should learn what an Activity is in Android and what is the lifecycle of an Activity.
Can Android activity exist without UI?
Is it possible to create a Android activity without UI? Yes it is. Android provides a theme for this requirement.
Is it possible to have activity without UI in Android?
The answer is yes it’s possible. Activities don’t have to have a UI. It’s mentioned in the documentation, e.g.: An activity is a single, focused thing that the user can do.
Can we create activity without UI in Android?
mentioned by Brian515 works great. This method is useful for creating an entry point Activity that decides on which activity to call, start, services, etc without having to show a UI to the user. Remember to use finish() after you have started your intent. This should work to wipe activities off of the stack.
What is the life cycle of Broadcastreceiver in Android Mcq?
When a broadcast message arrives for the receiver, Android calls its onReceive() method and passes it the Intent object containing the message. The broadcast receiver is considered to be active only while it is executing this method. When onReceive() returns, it is inactive.
How are layouts placed in Android?
Layout files are stored in “res-> layout” in the Android application. When we open the resource of the application we find the layout files of the Android application. We can create layouts in the XML file or in the Java file programmatically.
What is a visible activity?
A visible process is doing work that the user is currently aware of, so killing it would have a noticeable negative impact on the user experience. … It is running an Activity that is visible to the user on-screen but not in the foreground (its onPause() method has been called).
What is the difference between onCreate and onStart activity?
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 onCreate method in Android?
onCreate is used to start an activity. super is used to call the parent class constructor. setContentView is used to set the xml.