Android Development Quiz

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Questions and Answers

Which of the following is NOT a type of persistent storage available in Android applications?

Shared Preferences
Internal Files
SQLite databases
Cookies (correct)

Shared Preferences in Android can store non-primitive data types.

False (B)

What is the purpose of the AssetManager in Android applications?

To provide access to an application's raw asset files.

The __________ directory in Android is used for storing compiled XML files.

res/xml Signup and view all the answers

Match the following persistent storage types with their descriptions:

Shared Preferences = Persistent storage for key-value pairs SQLite databases = Structured data storage using SQL Internal storage = Private storage space for application External storage = Public storage accessible by other apps Signup and view all the answers

Which method is used to bind an adapter to a ListView?

setAdapter() (D) Signup and view all the answers

The BaseAdapter class does not require the implementation of the getCount() method.

False (B) Signup and view all the answers

What is the purpose of the ViewHolder pattern in an adapter?

To optimize item view recycling and improve performance. Signup and view all the answers

To display a list in Android, the class used is called __________.

ListView Signup and view all the answers

What data structure is used to store key-value pairs in a SimpleAdapter?

HashMap (A) Signup and view all the answers

Match the following classes or interfaces with their correct purpose:

ArrayAdapter = Bind an array to a list view SimpleAdapter = Bind a list of maps to a list view BaseAdapter = Custom adapter for complex lists AdapterView.OnItemClickListener = Handles item click events Signup and view all the answers

Parcelable is more complex than Serializable in Java.

True (A) Signup and view all the answers

What method would you use to retrieve the selected item in a Spinner?

getSelectedItem() Signup and view all the answers

To show a toast message in Android, you use __________.makeText().

Toast Signup and view all the answers

What attribute is used to align a component to the top of its parent in a RelativeLayout?

android:layout_alignParentTop (A) Signup and view all the answers

The android:layout_rowSpan attribute is used to spread a component across multiple columns in a GridLayout.

False (B) Signup and view all the answers

How do you specify that a view in a GridLayout should start at the first column?

android:layout_column="0" Signup and view all the answers

In a RelativeLayout, to align one view relative to another, you would use _______ attributes.

id-based Signup and view all the answers

Match the following layout features with their descriptions:

android:layout_centerHorizontal = Aligns view centrally along the horizontal axis android:layout_columnSpan = Spreads a component across multiple columns android:layout_toRightOf = Positions a component to the right of another component android:layout_alignParentBottom = Aligns the view to the bottom of its parent Signup and view all the answers

Which of these attributes would you use to center a component in its parent layout?

android:layout_centerInParent (B) Signup and view all the answers

What is the primary purpose of using Include, Merge, and ViewStub in layouts?

To simplify layout management and improve performance. Signup and view all the answers

Which method is executed first in the AsyncTask lifecycle?

onPreExecute() (A) Signup and view all the answers

The doInBackground() method runs synchronously and blocks the UI thread until completion.

False (B) Signup and view all the answers

What type of values does the AsyncTask class accept for its execute() method?

Object type values Signup and view all the answers

The method that provides a way to update the UI with progress from doInBackground is called __________.

onProgressUpdate Signup and view all the answers

Match the following AsyncTask methods with their descriptions:

onPreExecute() = Initial setup before background execution doInBackground() = Heavy resource processing onProgressUpdate() = Updates progress of background execution onPostExecute() = Final result processing after background completion Signup and view all the answers

What does the publishProgress() method do in the AsyncTask class?

Updates the progress UI during doInBackground() execution. (C) Signup and view all the answers

The onPostExecute() method accepts parameters of a primitive type.

False (B) Signup and view all the answers

What is the return type of the doInBackground() method in this context?

Bitmap Signup and view all the answers

The AsyncTask class runs work on a __________ thread, separate from the UI thread.

secondary Signup and view all the answers

In the HeavyTask class, which method is called to perform background processing?

doInBackground() (B) Signup and view all the answers

What method is used to obtain a string from a JSONObject?

getString() (B) Signup and view all the answers

JSONArray does not allow accessing its elements by index.

False (B) Signup and view all the answers

What is the purpose of POJO in Java?

To create models for JSON or XML objects. Signup and view all the answers

Retrofit uses _____ by default for JSON conversion.

Gson Signup and view all the answers

Match the following methods with their functions:

getInt() = Retrieve an integer from a JSONObject length() = Get the number of elements in a JSONArray getJSONObject() = Extract a nested JSONObject from a JSONObject setEndpoint() = Define the base URL for a RestAdapter Signup and view all the answers

Which HTTP method is used to request data in Retrofit?

GET (B) Signup and view all the answers

RestAdapter must be built before creating a RestInterface instance.

True (A) Signup and view all the answers

What is the primary role of the Retrofit Interface?

To manage URL connections and API calls. Signup and view all the answers

The library that provides a set of tools for managing the URL's is called _____ class.

service Signup and view all the answers

Which of the following is not mentioned as a resource for Android development?

Professional Java Development (C) Signup and view all the answers

Flashcards

RelativeLayout

A layout where views are positioned relative to each other and the parent container, using attributes like android:layout_alignParentTop and android:layout_alignLeft.

Align to Parent Top

The attribute android:layout_alignParentTop aligns a view to the top edge of its parent container within a RelativeLayout.

Align to Other Components

You can position views relative to other views within a RelativeLayout, such as android:layout_alignLeft="@id/viewName" to align the left edge to the left edge of another view.

Position Below/Above

In a RelativeLayout, you can place a view below or above another view by using android:layout_below="@id/viewName" or android:layout_above="@id/viewName".