Android MCQ: October 2017

Archive for October 2017

The SharedPreferences class provides one of the easiest ways to save and load data. Which specific data type does this refer to?

The SharedPreferences class provides one of the easiest ways to save and load data. Which specific data type does this refer to? Answer: primitive...

The following permissions are necessary in the Android Manifest file to use which type of storage?

The following permissions are necessary in the Android Manifest file to use which type of storage? Answer: extern...

If data is lost when an app or the device stops running where was the data stored?

If data is lost when an app or the device stops running where was the data stored? Answer: R...

If you have a large amount of data to store as persistent data, which of the following storage methods would be most efficient?

If you have a large amount of data to store as persistent data, which of the following storage methods would be most efficient? Answer: databa...

All applications can read and write files placed on external storage. T/F

All applications can read and write files placed on external storage. T/F Answer: Tr...

Persistent data stores values permanently by placing the information in a file. T/F

Persistent data stores values permanently by placing the information in a file. T/F Answer: Tr...

What is the maximum number of shared preferences you can create?

What is the maximum number of shared preferences you can create? Answer: unlimit...

Which type of file does the SharedPreferences object save data to?

Which type of file does the SharedPreferences object save data to? Answer: X...

The persistent data structure is available in some form in every programming language. T/F

The persistent data structure is available in some form in every programming language. T/F Answer: Tr...

SharedPreferences can be used to save only int and string primitive data. T/F

SharedPreferences can be used to save only int and string primitive data. T/F Answer: Fal...

Which data type is NOT supported by the SharedPreferences class?

Which data type is NOT supported by the SharedPreferences class? Answer: ch...

Android applications cannot save data for later retrieval if the application is closed. T/F

Android applications cannot save data for later retrieval if the application is closed. T/F Answer: Fal...

Which of the following correctly completes the statement below to instantiate a SharedPreferences object?

Which of the following correctly completes the statement below to instantiate a SharedPreferences object? Answer: SharedPreferences sharedPref =...

An undefined string value is set to a(n) ____________ value, which is represented by empty quotes.

An undefined string value is set to a(n) ____________ value, which is represented by empty quotes. Answer: nu...

With Android, you have the option of storing persistent data only on the device's internal storage. T/F

With Android, you have the option of storing persistent data only on the device's internal storage. T/F Answer: Fal...

Which statement dynamically assigns an image named car in the drawable folder to an ImageView control?

Which statement dynamically assigns an image named car in the drawable folder to an ImageView control? Answer: image.setImageResource(R.drawable....

The code to create an instance of a SharedPreferences editor object named edit is ________.

The code to create an instance of a SharedPreferences editor object named edit is ________. Answer: SharedPreferences.Editor edit = sharedPref.e...

If a string value is undefined in a key's value, what is it set to?

If a string value is undefined in a key's value, what is it set to? Answer: nu...

Which method is used to store integer data in a SharedPreferences object?

Which method is used to store integer data in a SharedPreferences object? Answer: putInt...

The persistent _______ structure is available in some form in every programming language.

The persistent _______ structure is available in some form in every programming language. Answer: data ...

Data stored in _____ is lost when the app (or the device) stops running.

Data stored in _____ is lost when the app (or the device) stops running. Answer: R...

When you write data using SharedPreferences, with which SharedPreferences object can you make changes?

When you write data using SharedPreferences, with which SharedPreferences object can you make changes? Answer: SharedPreferences Edit...

The code to store the string "Hello" into a key named "greeting" using a SharedPreferences editor object named edit is _______.

The code to store the string "Hello" into a key named "greeting" using a SharedPreferences editor object named edit is _______. Answer: ....

The _____ stores structured data in a private database.

The _____ stores structured data in a private database. Answer: SQLite databa...

If a numeric value is undefined in a key's value, what is it set to?

If a numeric value is undefined in a key's value, what is it set to? Answer:...

Which type of storage is used if data is saved to an SD card?

Which type of storage is used if data is saved to an SD card? Answer: Extern...

The ____ method retrieves string values.

The ____ method retrieves string values. Answer: getString...

What's the first step when writing persistent data using a SharedPreferences file?

What's the first step when writing persistent data using a SharedPreferences file? Answer: Obtain an instance of the SharedPreferences fi...

The _______ method retrieves long values.

The _______ method retrieves long values. Answer: getLong...

The code to assign a key-value pair for a floating point value with keyname interest and variable name fltInterest using a SharedPreferences editor object named edit is _______.

The code to assign a key-value pair for a floating point value with keyname interest and variable name fltInterest using a SharedPreferences editor...

After the app is terminated, what happens to the data stored within the SQLite database?

After the app is terminated, what happens to the data stored within the SQLite database? Answer: It persis...

The name-value pair in a SharedPreferences object is saved to a(n) ______ file that can be retrieved later in the app or after the app closes.

The name-value pair in a SharedPreferences object is saved to a(n) ______ file that can be retrieved later in the app or after the app closes. Answer:...

A(n) _________ stores persistent data on a web server.

A(n) _________ stores persistent data on a web server. Answer: Network connecti...

What does the abbreviation SQL stand for?

What does the abbreviation SQL stand for? Answer: Structured Query Langua...

Which method is used to retrieve a Boolean value from a SharedPreferences object?

Which method is used to retrieve a Boolean value from a SharedPreferences object? Answer: getBoolean...

Before an app attempts to connect to a network connection, what action should be taken?

Before an app attempts to connect to a network connection, what action should be taken? Answer: The app should see if an Internet connection is a...

The SharedPreferences class stores private data as single values. T/F

The SharedPreferences class stores private data as single values. T/F Answer: Fal...

____ stores values permanently by placing the information in a file.

____ stores values permanently by placing the information in a file. Answer: Persistent da...

SharedPreferences are best when your app needs to save small chunks of data. T/F

SharedPreferences are best when your app needs to save small chunks of data. T/F Answer: Tr...

_____ stores data, which can be available to other apps on shared external storage.

_____ stores data, which can be available to other apps on shared external storage. Answer: External stora...

How does the Shared preferences option of storing persistent data store private data?

How does the Shared preferences option of storing persistent data store private data? Answer: key-value pai...

In a key-value pair, what is the key that uniquely identifies the preference?

In a key-value pair, what is the key that uniquely identifies the preference? Answer: stri...

In an Android project, an ImageView control can display an image by assigning what in the XML layout file?

In an Android project, an ImageView control can display an image by assigning what in the XML layout file? Answer: source pa...

To write key-value pair assignments to an XML data file using a SharedPreferences editor object named edit, type ____________________.

To write key-value pair assignments to an XML data file using a SharedPreferences editor object named edit, type ____________________. ....

For Shared Preferences methods, what does the method return to the application if the preference is undefined?

For Shared Preferences methods, what does the method return to the application if the preference is undefined? Answer: default val...

Which Android tool can store data that can be used in different Activities of your application or by another application?

Which Android tool can store data that can be used in different Activities of your application or by another application? Answer: SharedPreferenc...

A SharedPreferences object is used to store user data only as long as the application is open. T/F

A SharedPreferences object is used to store user data only as long as the application is open. T/F Answer: Fal...

All applications on a device can access any files created by an app when they are saved with the internal storage method. T/F

All applications on a device can access any files created by an app when they are saved with the internal storage method. T/F Answer: Fal...

Loading data saved in a SharedPreferences XML file begins by _______________ the SharedPreferences object.

Loading data saved in a SharedPreferences XML file begins by _____ the SharedPreferences object. Answer: instantiati...

What is one of the most effective ways to save simple application data to an Android device?

What is one of the most effective ways to save simple application data to an Android device? Answer: SharedPreferences obje...

____ can downgrade a database.

____ can downgrade a database. Answer: onDowngra...

DatabaseOpenHelper's _______ will be called to upgrade the database to the newest version.

DatabaseOpenHelper's _______ will be called to upgrade the database to the newest version. Answer: onUpgrad...

The SQLiteDatabase's query method returns a cursor containing the _______ .

The SQLiteDatabase's query method returns a cursor containing the _______ . Answer: Result-s...

SQLite doesn't support inserting an empty row.

SQLite doesn't support inserting an empty row. Answer: Tr...

A database will be cached by an os to improve performance.

A database will be cached by an os to improve performance. Answer: True ...

Database names don't have to be unique across apps.

Database names don't have to be unique across apps. Answer: Fal...

Android doesn't automatically release database resources.

Android doesn't automatically release database resources. Answer: Tr...

Class cursor provides a method _______ if you prefer to get an exception when the specified column DNE.

Class cursor provides a method _______ if you prefer to get an exception when the specified column DNE. Answer: getColumnIndexOrThr...

It's considered best practice to ensure _______ returns true before attempting to get data from the database object.

It's considered best practice to ensure _______ returns true before attempting to get data from the database object. Answer: moveToFir...

Cursor method _______ moves the cursor to the first row of the result set.

Cursor method _______ moves the cursor to the first row of the result set. Answer: moveToFirst ...

Method _______ uses the MenuItem's resourceID to determine which one was selected.

Method _______ uses the MenuItem's resourceID to determine which one was selected. Answer: onOptionsItemSelect...

Use the CursorAdapter method _______ to remove the cursor.

Use the CursorAdapter method _______ to remove the cursor. Answer: changeCursor(tru...

______ is called after onPause when the Fragment is no longer visible.

______ is called after onPause when the Fragment is no longer visible. Answer: onSt...

AsyncTask's execute method _______ performs the task in a separate thread.

AsyncTask's execute method _______ performs the task in a separate thread. Answer: doInBackgrou...

An AsyncTask can only be executed ___ time(s).

An AsyncTask can only be executed ___ time(s). Answer:...

You call inherited ListActivity method _______ to bind a ListView to a cursor to display the data.

You call inherited ListActivity method _______ to bind a ListView to a cursor to display the data. Answer: setListAdapt...

You cannot use custom layout resources for ListView items.

You cannot use custom layout resources for ListView items. Answer: Fal...

_____ is a subclass of CursorAdapter designed to simplify mapping of cursor columns directly to TextViews and ImageViews.

_____ is a subclass of CursorAdapter designed to simplify mapping of cursor columns directly to TextViews and ImageViews. Answer: SimpleCursorAda...

To display the Cursor's results in a ListView we create a new _______ to expose the cursor's data in a manner that can be used by a ListView.

To display the Cursor's results in a ListView we create a new _______ to expose the cursor's data in a manner that can be used by a ListView. Answer:...

You call ListView method _______ to determine how many items can be selected.

You call ListView method _______ to determine how many items can be selected. Answer: setChoiceMo...

You call Fragment method _______ to indicate that the list fragment should be retained rather than created.

You call Fragment method _______ to indicate that the list fragment should be retained rather than created. Answer: setRetainedInstance(tru...

_____ pushes a Fragment onto the back stack so that if the user pushes the back button it will pop that Fragment back.

_____ pushes a Fragment onto the back stack so that if the user pushes the back button it will pop that Fragment back. Answer: addToBacksta...

You can pass arguments to a fragment by placing them in a _______ of key-value pairs.

You can pass arguments to a fragment by placing them in a _______ of key-value pairs. Answer: Bundl...

FragmentManager's _______ method removes the top fragment of a Fragment back stack.

FragmentManager's _______ method removes the top fragment of a Fragment back stack. Answer: popBackSta...

If the resource ID _______ exists in MainActivity's layout, then the app is running on a phone.

If the resource ID _______ exists in MainActivity's layout, then the app is running on a phone. Answer: R.id.FragmentContain...

You can configure a Fragment to be retained across configuration changes, such as when the user rotates the device.

You can configure a Fragment to be retained across configuration changes, such as when the user rotates the device. Answer: tr...

Class MainActivity manages the app's fragments and coordinates the interactions between them. On phones, MainActivity display one master Fragment and one detail Fragment at a time.

Class MainActivity manages the app's fragments and coordinates the interactions between them. On phones, MainActivity display one master Fragment and...

Each menu item's order in category values determine the order in which the menu items appear on the action bar.

Each menu item's order in category values determine the order in which the menu items appear on the action bar. Answer: tr...

textPostalAddress|_______ capitalizes state abbreviations.

textPostalAddress|_______ capitalizes state abbreviations. Answer: textCapCharacte...

Each _ specifies input type and IME options. For devices with a soft keyboard, the _ specifies which keyboard to display.

Each _______ specifies input type and IME options. For devices with a soft keyboard, the _______ specifies which keyboard to display. Answer: EditText,...

A _______ is a ViewGroup that lets the user scroll through the content too large to display on the screen.

A _______ is a ViewGroup that lets the user scroll through the content too large to display on the screen. Answer: ScrollVi...

Style resources are placed in the app's _______ folder.

Style resources are placed in the app's _______ folder. Answer: Res/valu...

We use _______ to perform operations in one thread and receive the results in the GUI thread.

We use _______ to perform operations in one thread and receive the results in the GUI thread. Answer: AsyncTas...

Long-running operations should be placed outside the _______ .

Long-running operations should be placed outside the _______ . Answer: GUI Thre...

The _______ simplifies creating the database and enables you to get a SQLiteDatabase object for manipulating a database's content.

The _______ simplifies creating the database and enables you to get a SQLiteDatabase object for manipulating a database's content. Answer: SQLite...