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 an activity in Android in Mcq?
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 the lifecycle of foreground activity in Android Mcq?
The activity lifecycle: the foreground lifetime. The activity gets launched, and the onCreate() and onStart() methods run. At this point, the activity is visible, but it doesn’t have the focus. The onResume() method runs after the onStart() method.
What is Sandbox in Android Mcq?
Q 5 – What is sandbox in android? A – Each application runs securely in sandbox without interrupting another process. B – Android Box. C – Android development tool kit.
What are return types of Startactivityforresult () in Android Mcq?
Options 1) RESULT_OK 2) RESULT_CANCEL 3) RESULT_CRASH 4) A & B.
What are the two types of intents in Android?
There are two types of intents in android: Implicit and. Explicit.
What is the main activity?
Generally, one activity implements one screen in an app. Typically, one activity in an app is specified as the main activity, which is the first screen to appear when the user launches the app. Each activity can then start another activity in order to perform different actions.
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 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.
Which method is called before activity is destroyed?
The onDestroy() method runs immediately before the activity is destroyed. The onDestroy() method enables you to perform any final cleanup such as freeing up resources. After the onDestroy() method has run, the activity is destroyed.
What is the sandbox in Android?
This isolates apps from each other and protects apps and the system from malicious apps. To do this, Android assigns a unique user ID (UID) to each Android application and runs it in its own process. The sandbox is simple, auditable, and based on decades-old UNIX-style user separation of processes and file permissions.
What are the main components in Android?
Android applications are broken down into four main components: activities, services, content providers, and broadcast receivers. Approaching Android from these four components gives the developer the competitive edge to be a trendsetter in mobile application development.
What is JNI in Android *?
JNI is the Java Native Interface. It defines a way for the bytecode that Android compiles from managed code (written in the Java or Kotlin programming languages) to interact with native code (written in C/C++).
What is the fragment lifecycle 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.
What is the purpose of super onCreate () in android?
Q 9 – What is the purpose of super. onCreate() in android? The super. onCreate() will create the graphical window for subclasses and place at onCreate() method.
What is 9 patch tool in Android Mcq?
Q5. What is the 9 patch tool in android? Using the tool, we can redraw images in 9 sections.
What is Intentfilter?
An intent filter is an expression in an app’s manifest file that specifies the type of intents that the component would like to receive. For instance, by declaring an intent filter for an activity, you make it possible for other apps to directly start your activity with a certain kind of intent.
What is startActivity in Android?
Starting activities or services. To start an activity, use the method startActivity(intent) . This method is defined on the Context object which Activity extends. The following code demonstrates how you can start another activity via an intent.
What is the purpose of intent in Android?
An intent is to perform an action on the screen. It is mostly used to start activity, send broadcast receiver,start services and send message between two activities. There are two intents available in android as Implicit Intents and Explicit Intents. Here is a sample example to start new activity with old activity.
How do I view activity on Android?
View other activity On your Android phone or tablet, open your device’s Settings app Google Manage your Google Account. At the top, tap Data & privacy. Under “History settings,” tap My Activity. Above your activity, in the search bar, tap More Other Google Activity.
What is MainActivity class in Android?
In Mobile SDK apps, the main activity begins immediately after the user logs in. Once the main activity is running, it can launch other activities, which in turn can launch sub-activities. The template app’s MainActivity class extends the abstract Mobile SDK activity class, com.
What is dummy activity?
A dummy activity is an activity added to a project schedule as a placeholder. A dummy activity is intended to show a path of action in a project activity diagram and is employed when a logical relationship between two activities cannot be linked by showing the use of arrows linking one activity to another.
Is Android activity visible?
In your finish() method, you want to use isActivityVisible() to check if the activity is visible or not. There you can also check if the user has selected an option or not. Continue when both conditions are met.
Which callback is called when the activity restarts after stopping it?
onRestart() Sr.No Callback & Description 5 onStop() This callback is called when the activity is no longer visible. 6 onDestroy() This callback is called before the activity is destroyed by the system. 7 onRestart() This callback is called when the activity restarts after stopping it.
What is foreground activity?
Apps running on Android 10 or higher can start activities only when one or more of the following conditions are met: The app has a visible window, such as an activity in the foreground. The app has an activity in the back stack of the foreground task.