Java Programming Language

Question 1

What is the primary language for Android app development?

Answer 1

Java

Question 2

Define an ‘Activity’ in Android development.

Answer 2

An Activity represents a single screen with a user interface.

Question 3

What is ‘Intent’ used for in Android apps?

Answer 3

Intent is used to request an action from an app component.

Question 4

How do you start a new activity using Intent in Java?

Answer 4

Intent intent = new Intent(this, NewActivity.class); startActivity(intent);

Question 5

What is the purpose of an XML layout file in Android?

Answer 5

It specifies the UI design for activities and fragments.

Question 6

How do you link a Java file to an XML layout file in Android?

Answer 6

Using setContentView(R.layout.activity_main); in the onCreate method.

Question 7

What is the AndroidManifest.xml file used for?

Answer 7

It declares app permissions and essential app metadata.

Question 8

Explain how to handle user input in Android.

Answer 8

Use findViewById() to access UI elements and setOnClickListener() for button clicks.

Question 9

Describe the lifecycle of an Android activity.

Answer 9

It includes onCreate(), onStart(), onResume(), onPause(), onStop(), and onDestroy().

Question 10

How do you save data persistently in Android apps?

Answer 10

Use SharedPreferences, SQLite databases, or file storage.

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