móviles programacion dam

1

Móviles U2

What is the name of the folder that contains the R.java file? Select one:

a. src

b. bin

c. res

d. gen Feedback

The correct answer is: gen

Question 2

Match:

ListView Answer 1

Displays a scrolling single column list

GridView Answer 2

Displays a scrolling grid of columns and row s

LinearLayout Answer 3

Organizes its children into a single horizontal or vertical row

The correct answer is: ListView

– Displays a scrolling single column list, GridView

– Displays a scrolling grid of columns and rows, LinearLayout

– Organizes its children into a single horizontal or vertical row

Question 3

Which layout is designed to block out an area on the screen to display a single item? Select one:

a. TableLayout

b. FrameLayout

c. LinearLayout

d. RelativeLayout The correct answer is: FrameLayout

Question 4

2

Which of these is correct about XML layout files? Select one:

a. Layout information written in the XML layout file will be converted into code by the Android platform when the screen is displayed.

b. There is no distinction between implementation of the layout definition by code or by XML layout file

c. In an Eclipse project using the ADT plugin, the XML layout file is found in the /res/layout

directory

d. In order to display an UI defined in the XML layout file "main.xml", call the setContentView method of the Activity with the parameter string "main.xml" Feedback

The correct answer is: In an Eclipse project using the ADT plugin, the XML layout file is found in the /res/layout directory

Question 5

You can populate an AdapterView such as ListView or GridView by binding the AdapterView instance to an Adapter, which retrieves data from an external source and creates a View that represents each data entry.

Select one:

True

False

The correct answer is 'True'.

Question 6

The ___________ specifies the layout of your screen

Select one:

a. R file

b. Manifest file

c. Layout file

d. Strings XML

The correct answer is: Layout file

Question 7

3

Which is the correct explanation of ListView?

Select one:

a. When displaying a list of Strings using an ArrayAdapter class in ListView, you must save

the value in an ArrayList

b. You cannot use a ListView when there is no information to be displayed

c. ListView has a function to display a list of uniquely defined Views other than TextView

d. It is necessary to use ListView as a set with ListActivity

The correct answer is: ListView has a function to display a list of uniquely defined Views other

than TextView

Question 8

Which one is not a nickname of a version of Android?

Select one:

a. Honeycomb

b. Cupcake

c. Gingerbread

d. Muffin

The correct answer is: Muffin

Question 9

The Android Software Development Kit (SDK) is all you need to develop applications for

Android

Select one:

a. False

b. True

The correct answer is: True

Question 10

4

A fragment is a modular section of an activity, which has its own lifecycle, receives its own input events, and which you can add or remove while the activity is running.

Select one:

True

False


Question 11

The plus(+) means in statement android:id="@+id/my_id"?

Select one:

a. XML parser should parse and expand id string

b. Create new id and add to resources

c. Identify it as an id resource

d. Both a & b

The correct answer is: Create new id and add to resources

Question 12

Complete:

public static class ExampleFragment extends Fragment {

@Override public View _____________ (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

return inflater.inflate (R.layout.example_fragment, container, false);

}

}

Select one:

a. onPause

5

b. onCreateView

c. onCreate

d. onView

The correct answer is: onCreateView

Question 13

Which is wrong?

Select one:

a. Each layout file must contain exactly two root elements

b. After you've declared your layout in XML, save the file with the .xml extension

c. A layout defines the visual structure for a user interface

d. The advantage to declaring your UI in XML is that it enables you to better separate the

presentation of your application from the code that controls its behavior

The correct answer is: Each layout file must contain exactly two root elements

Question 14

The R file is a(an) __________ generated file

Select one:

a. Manually

b. Automatically

c. Emulated

d. None of the above

The correct answer is: Automatically

Question 15

What operating system is used as the base of the Android stack?

6

Select one:

a. Linux

b. Java

c. XML

d. Windows

The correct answer is: Linux

Question 16

To create an emulator, you need an AVD. What does it stand for? Select one:

a. Android Virtual Device

b. Android Virtual Display

c. Application Virtual Display

d. Active Virtual Device The correct answer is: Android Virtual Device

Question 17

Match:

Toggle Buttons

Answer 1Allow the user to change a setting betw een tw o states

Text Fields Answer 2Allow the user to type text into the app

Chechboxes Answer 3Allow the user to select one or more options from a set

Radio Buttons Answer 4Allow the user to select one option from a set

The correct answer is: Toggle Buttons

– Allow the user to change a setting between two states, Text Fields

7

– Allow the user to type text into the app, Chechboxes

– Allow the user to select one or more options from a set, Radio Buttons

– Allow the user to select one option from a set

Question 18

What Activity method you use to retrieve a reference to an Android view by using the id attribute of a resource XML?

Select one:

a. findViewById (String id)

b. findViewByReference (int id)

c. retrieveResourceById (int id)

d. findViewById (int id) The correct answer is: findViewById (int id)

Question 19

Where the positions of the children can be described in relation to each other or to the parent? Select one:

a. LinearLayout

b. TableLayout

c. FrameLayout

d. RelativeLayout Feedback

The correct answer is: RelativeLayout

Question 20

An activity can be thought of as corresponding to what? Select one:

a. An object field

b. A Java class

c. A Java project

d. A method call

The correct answer is: A Java class

8

Moviles U3

Question 1

An activity can be thought of as corresponding to what?

Select one:

A Java class

A method call

An object field

A Jave project

The correct answer is: A Java class

Question 2

Which of the following is not an activity state?

Select one:

Stopped

Paused

Running

Resumed

The correct answer is: Resumed

Question 3

What does the following code achive?

Intent intent = new Intent(Activity1.this, Activity2.class);

startActivityForResult(intent);

Select one:

Starts a browser activity

9

Starts a sub-activity

Starts an activity service

Send results to another activity

The correct answer is: Starts a sub-activity

Question 4

The activity lifecycle method onPause() is called when the activity becomes visible to the user.

Select one:

True

False

The correct answer is 'False'.

Question 5

What does the following code achive?

Intent intent = new Intent(Activity1.this, Activity2.class);

Select one:

Creates an hidden Intent

Creates an implicit Intent

Creates an explicit Intent

Starts an activity

The correct answer is: Creates an explicit Intent

Question 6

Implicit intents explicitly define the component which should be called by the Android system, by using the Java class as identifier.

Select one:

10

True

False

The correct answer is 'False'.

Question 7

The activity lifecycle method onResume() is called if the activity get visible again and the user starts interacting with the activity again.

Select one:

True

False

Feedback


Question 8

What does the following code?

Bundle extras = getIntent().getExtras();

String dato1 = extras.getString("dato1");

int dato2 = extras.getInt("dato2");

Select one:

Nothing

Return data

Recover the data that has been passed to the activity

Send data to an activity

The correct answer is: Recover the data that has been passed to the activity

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Question 9

Android supports:

Select one:

Explicit intents

Implicit intents

Explicit and implicit intents

The correct answer is: Explicit and implicit intents

Question 10

The activity lifecycle method onCreate() is called when the activity is first created.

Select one:

True

False


Question 11

Android system uses intents to

Select one:

To invoke other applications from your application

Broadcast system intents

Broadcast custom intents

All of the above

The correct answer is: All of the above

12

Question 12


Intent intent = new Intent();

intent.putExtra("dato1", "Esto es un ejemplo");

setResult(RESULT_OK, intent);

Select one:

Read the information received from another activity

Return data to the activity that has called us

Send information to another activity without waiting for an answer

Send data to another activity waiting for an answer

The correct answer is: Return data to the activity that has called us

Question 13

What is contained within the manifest xml file?

Select one:

All other choices

The permissions the app requires

The list of strings used in the app

The source code

The correct answer is: The permissions the app requires

Question 14

Intents are asynchronous messages which allow application components to request functionality from others Android components.

Select one:

13

True

False


Question 15

During an Activity lifetime, what is the first method callback invoked by the system?

Select one:

onRestore()

onStop()

onStart()

onCreate()

Feedback

The correct answer is: onCreate()

Question 16


Intent intent = new Intent(this, Activity2.class);

intent.putExtra("dato1", "Esto es un ejemplo");

startActivity(intent);

Select one:

Return the data to Activity2

Send information to Activity2 without waiting for an answer

Send data to Activity2 waiting for an answer

Read the information received from Activity2

The correct answer is: Send information to Activity2 without waiting for an answer

14

Question 17

Once ____________ has finished, Android will call onStart()

Select one:

onPause()

onBegin()

onResume()

onCreate()

The correct answer is: onCreate()

Question 18

Optionally an intent can also contain additional data based on an instance of the Bundle class which can be retrieved from the intend via the getExtras() method.

Select one:

True

False

Feedback


Question 19

If the Android system needs to terminate processes it follows a priority system. Match each

process status with its priority:

Empty Answer 1

5

Service Answer 2

3

15

Background Answer 3

4

Foreground Answer 4

1

Visible Answer 5

2

Feedback

The correct answer is: Empty – 5, Service – 3, Background – 4, Foreground – 1, Visible – 2

Question 20

Match the following buttons of an Android device with its function:

Home button Answer 1

Android place the activity into the background

Power button Answer 2

Lock the screen

Back button Answer 3

Android w ill kill the activity

Feedback

The correct answer is: Home button – Android place the activity into the background, Power

button – Lock the screen, Back button – Android will kill the activity

Moviles U4

Question 1

The database tables should use the identifier _id for the primary key of the table

Select one:

True

False


16

Question 2

What is the life cycle of a content provider?

Select one:

All the content providers will be created (onCreate()) after phone has booted first time

A content provider's onCreate() function will be called the first time some client calls

providers functions using content resolver

None

A content provider's onCreate() function will be called every time some client calls providers

functions using content resolver

The correct answer is: A content provider's onCreate() function will be called the first time some

client calls providers functions using content resolver

Question 3

Correct

Is it possible to start a content provider using an intent?

Select one:

Yes, it's possible. Content provider is also a component of Android, so we can use intent to

start it

It's not possible. We use content resolver to communicate with content provider

The correct answer is: It's not possible. We use content resolver to communicate with content

provider

Question 4

A content provider is typically used to share data with other applications.

Select one:

True

False


17

Question 5

Does getWriteableDatabase() always call onCreate() of SQLiteOpenHelper class?

Select one:

Only if the database is not created

Yes, it does

None of the above

Every time that the user starts the application

The correct answer is: Only if the database is not created

Question 6

A SQLite database is private to the application which creates it.

Select one:

True

False


Question 7


ContentValues values = new ContentValues();

values.put ("name", "Pepe");

db.insert ("myTable", null, values);

Select one:

Nothing

Inserts two new rows into "myTable"

Deletes a row

18

Inserts a new row into "myTable" where "name" is "Pepe"

The correct answer is: Inserts a new row into "myTable" where "name" is "Pepe"

Question 8

Is it possible to pass a lower version number to upgrade a SQLite database?

Select one:

Yes, it's possible

None of the above

Helper class will assume that we will always pass version numbers in incremental order for

upgrading

It's not necessary to pass any value, system will automatically generate higher version

number

The correct answer is: Helper class will assume that we will always pass version numbers in

incremental order for upgrading

Question 9

The SQLiteOpenHelper class

Select one:

doesn't allow upgrade a database

allow access to data stored in a database

allow create and upgrade a database

All options are true

The correct answer is: allow create and upgrade a database

Question 10

How to upgrade database tables?

Select one:

Pass different version number in incremental order and put all upgrading code in

onCreate() of SQLiteOpenHelper class

19

Pass different version number in any order and put all upgrading code in onUpgrade() of

SQLiteOpenHelper class

Pass different version number in decremental order and put all upgrading code in

onUpgrade() of SQLiteOpenHelper class

Pass different version number in incremental order and put all upgrading code in

onUpgrade() of SQLiteOpenHelper class

The correct answer is: Pass different version number in incremental order and put all upgrading

code in onUpgrade() of SQLiteOpenHelper class

Question 11

Which methods of the SQLiteOpenHelper class get access to an SQLiteDatabase object?

Select one:

getAccessDatabase()

getWriteDatabase()

getReadDatabase()

getReadableDatabase() and getWriteableDatabase()

The correct answer is: getReadableDatabase() and getWriteableDatabase()

Question 12

How to share daba between two applications?

Select one:

sqlite database

content resolver

content provider

file

The correct answer is: content provider

20

Question 13

Where does the SQLite database of an Android application get stored?

Select one:

By default it's stored in internal memory, but it is also possible to store it in sd card.

On sd card

On network server

Internal memory

The correct answer is: By default it's stored in internal memory, but it is also possible to store it

in sd card.

Question 14

What is the difference between contentprovider and contentresolver?

Select one:

They are not related with each other

Content provider is used to share private data with other applications and content resolver

is used to communicate with content provider from client application

Content provider is used to store private data and content resolver is used to communicate

with content provider from client application

Content resolver is used to share private data with other applications and content provider

is used to communicate with content provider from client application

The correct answer is: Content provider is used to share private data with other applications and

content resolver is used to communicate with content provider from client application

Question 15

A Cursor represents the result of a query and basically points to one row of the query result.

Select one:

True

False


21

Question 16

Which option is true?

Select one:

SQLite requires limited memory at runtime

All options are true

SQLite supports standard standard database features

SQLite is an Open Source database

The correct answer is: All options are true

Question 17

What does a query return?

Select one:

A cursor object

A file

A data

An array

The correct answer is: A cursor object

Question 18

Which is the base class for working with a SQLite database in Android?

Select one:

SQLiteDatabase

Database

SQLiteData

22

SQLiteTable

The correct answer is: SQLiteDatabase

Question 19


return datablase.query ("myTable", null, null, null, null, null, null);

Select one:

Returns the first row of "myTable"

Returns the selected row of "myTable"

Returns all data stored in "myTable"

Nothing

The correct answer is: Returns all data stored in "myTable"

Question 20


return datablase.query ("myTable", null, null, null, null, null, "field1");

Select one:

Returns only the data of the column "field1"

Returns the selected row

Returns all data stored in "myTable" ordered by "field1"

Nothing

The correct answer is: Returns all data stored in "myTable" ordered by "field1"

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